LCD TV. Circuit Operation and Troubleshoot

Transcription

1 Order No. ITD603906GE LCD TV Model No. LCD Ver..0 Circuit Operation and Troubleshoot c anasonic Corporation 206 Unauthorized copying and distribution is a violation of law.

2 Revision History 2 Version Issued/Revised date Revised content Ver..0 25th. Mar. 206 First version

3 3 INDEX.Board Layout 2.Video Signal rocessing 3.ower Supply 3-. ower Board Structure 3-2. Stand by / Start up Operation 4.SOS rotection Circuit and Troubleshooting (except time blink) 5.Difference of LED Drive Circuit (Troubleshooting for time blink)

4 . Board Layout 4

5 Board Layout - ( DX*** series ) T*-**DX900 T*-65DX***, TH/TC-55DX*** G K B G K B BT WiFi BT WiFi K K T*-40DX*** T*-49/50/58DX***, TX-55DX*** LD G K G K BT WiFi WiFi K K GK board : depend on the model BT : depend on the model and region 5

6 Board Layout -2 ( D/DS*** series ) T*-49/43DS*** T*-49/43D*** T*-65/55DS*** LD LD G K G K BT WiFi BT WiFi K K T*-50/40/32DS*** T*-40/32D*** (except 32inch India model) TH-32D450/440/400D WiFi G K ( + + GK) BT K K WiFi : only DS*** series BT : only TC-**DS6**, TX-**DS630 series GK board : depend on the model 6

7 Main Board Structure Except K, GK boards 7 D4** DS4**/5**/6** DX6**/7**/8** (4K) 24inch inch + / (India : Board) inch LD inch ++LD ++LD inch ++LD ++LD inch inch LD +, ++B: (only TH-55DX640*, TC-55DX700*) DX900 (4K) 58inch B inch LD ++B ++B

8 Board Layout - + ( 32D40/400 ) 3 02 C input Speaker Speaker K K0 Board Name -Board -Board K-Board Function Main Board ower supply, Backlight Drive, ower key, Control key Remote Receiver, LED 8

9 Board Layout -2 ++LD/LD ( 49DS630 ) GK LD LD2 LD WiFi Module C input Speaker Speaker (T-CON) Not repairable, One of the panel module K0 K Board Name Function Board Name Function -Board Main Board GK-Board Key -Board ower supply for Signal rocess K-Board Remote Receiver, ower LED LD-Board ower supply for Backlight Drive 9

10 Board Layout -3 ++B ( 65DX900 ) B GK B5 B B B2 B3 3 C input 0 WiFi Module Speaker Speaker Bluetooth Module (T-CON) Not repairable, One of the panel module K0 K Board Name Function Board Name Function -Board Main Board GK-Board Key -Board ower supply for Signal rocess K-Board Remote Receiver, ower LED B-Board ower supply for Backlight Drive 0

11 2. Video Signal rocessing

12 Video/udio Signal rocess - D5** / D4** series OT_out USB ntenna terminal TU670* TUNER IC68** De-Modulation IC8000 (MTK556) V Component Resize I conv. OSD LVDS Data to LCD anel HDMI/2 The input terminals are different by the models or countries. 2

13 Video/udio Signal rocess - 2 DS5** / DS6** series OT_out (*)Headphone WiFi (*)Bluetooth IC860 (USB HUB) USB/2 ntenna terminal TU670* TUNER IC68** De-Modulation IC8000 (eaks LD6/ sld8) V Component SCRT (only Europe) LN IC8650 (LN) Resize I conv. OSD LVDS Data to LCD anel CI-slot (only Europe) HDMI/2/3 (*) Bluetooth : only TC-**DS6**(except Canada), TX-**DS630* The input terminals are different by the models or countries. 3

14 Video/udio Signal rocess - 3 DX6** / DX7** / DX8** series OT_out (*)Headphone WiFi (*)Bluetooth USB2 IC860 (USB HUB) USB USB3.0 ntenna terminal V Component TU670* TUNER IC68** De-Modulation IC8000 (MT580) Resize I conv. OSD 2D->3D IC9000 (Mstar/NTK) Frame Rate Convert to LCD anel ( V by One format ) LN CI-slot (only Europe) HDMI/2/3/(4) (except below models HDMI/2/3/(4) (TX-DX8** TH-DX640 TC-DX700C) IC4500 HDMI SW (*) Bluetooth : only DX9**/7** (except TC-**DX700C) The input terminals are different by the models or countries. 4

15 Video/udio Signal rocess - 4 DX900 series OT_out (*)Headphone WiFi Bluetooth IC8705 USB2 (USB HUB) USB USB3(3.0) SD card (only TC/TX ntenna terminal Component TU670* TUNER IC68** De-Modulation IC8000 (MT580) Resize I conv. OSD 2D->3D IC4300 (GCEX2) HDR Hexachroma IC9000 (NTK) Frame Rate Convert to LCD anel ( V by One format ) LN CI-slot (only Europe) HDMI/2/3/4 IC4500 HDMI SW (*) The input terminals are different by the models or countries. 5

16 Video/udio Signal rocess - 5 The main function of the board is to select and process one of the incoming video signals. IC860 is just switches of USB signals. The built in WiFi module is connected by USB type terminal. Video input, Component Video Input, HDMI input and the composite video output of the tuner are all connected to IC8000 for selection. The video input signal can be two formats: Video, or Y, b, r. comb filter inside IC8000 converts the composite video signal of the main picture to Y and C (luminance and chrominance) signals. The signal is then converted to RGB. t the completion of this process, the format of the composite signal is now the same as a digital 080i component signal. If the incoming video is in the 480p, 720p, 080i, and 080p format, the Y, b, and r signals undergo /D (analog to digital) conversion. Finally all picture signals are converted to 080p. Digital television reception of the tuner is output in the form of an IF (Intermediate Frequency) signal. The transport stream from the tuner enters the VSB I/F (Interface) section of IC8000 where the video signal is extracted and converted to YUV data. The output is provided to the Video Input I/F for selection. The JEG data of the SD card enters the JEG I/F section of IC8000 for conversion into YUV data and output to the Video Input I/F circuit. The video input interface outputs the selected picture data to the video process circuit. This Video rocess section of the IC performs all picture control operations such as brightness, contrast, color, tint, etc. On Screen Display data such as channel numbers, Digital TV closed caption, and picture adjustments are mixed with the video data. If in 3D mode, it converts to the right and left pictures. fter the process, LVDS (Low Voltage Differential Signaling) is output to LCD panel module. # IC9000 is the frame rate converting IC for high speed LCD panel. IC4300 adjust the brightness for HDR feature. 6

17 Troubleshoot for Video Signal roblem 7 <LCD anel Test Mode> :When abnormal picture is displayed, troubleshoot by the test pattern in LCD module. If the picture is no problem, board must be defective. If the picture is also abnormal, LCD panel module must be defective. Just in case, confirm the flat cable connection between board and T-CON board. How to enter : While pressing "volume(-)" button of the TV unit, press "option/yellow" button of the remote control 3 times within 2 seconds. How to exit : Switch off the TV unit #)The test pattern is created by the circuit in LCD anel Module(T-CON board). Some patterns are automatically changed. The patterns are depend on the LCD panel. IC8000 (eaks/mtk ) Resize I conv. LCD anel Module T-CON Test attern LCD anel

18 Troubleshoot for Video/udio Signal roblem <TV Self Test> : Customers also can check the picture and sound by internal data. If the picture and sound is no problem, the reason of trouble is mostly not a TV. How to display : Menu HEL TV Self Test #)The test pattern and test sound are created by the main IC on the board. TV Self Test (OK) *) D400/40 series do not support. ) During this indication Self Check of Service Mode is working at the background. 2) If NG, indication is shown. # board defective 3) If ll OK, it shifts to picture and sound test. Yes.ntenna level low 2.Connection mistake 3.Input devices NG 4.Input select mistake No TV unit defective. ( board, anel or Speaker) IC8000 (eaks/mtk Test ) attern Resize I conv. LCD anel Module T-CON LCD anel 8

19 3. ower Supply 3-. ower Board Structure 9

20 ower Board Structure ( Board only ) 20 < > VLED ower IC node FC IC HO ower LO IC LED Drive IC WM BL-ON Cathode (Backlight) BL-ON REG STB5V

21 ower Board Structure 2 ( +LD/LD board ) 2 < + LD/LD > LD/LD VLED ower IC node FC IC LED Drive IC Cathode (Backlight) HO ower LO IC WM BL-ON BL-ON REG STB5V

22 ower Board Structure 3 ( +B board ) < + B > (TN6249) only 65DX7**/8** ower IC LED Drive IC VLED node Cathode HO ower LO IC ower IC VLED2 node B LED Drive IC Cathode (Backlight) WM BL-ON FC IC (TN6060) HO ower LO IC REG STB5V 22

23 ower Board Structure 4 ( +B board ) < + B > B (TN6200) only DX9** VLED node HO ower LO IC VLED2 LED Drive IC Cathode (Backlight) FC IC HO ower LO IC Sync/control/etc BL-ON FC IC (TN699) HO ower LO IC REG STB5V 23

24 Stand by / Start up Operation The explanation is for the case of ower Board Structure 2 (+LD/LD board, 43/49DS630 ), but, +LD/LD, +B cases are basically same start up operation.

25 Voltage Distribution ( ++LD Boards ) Ex. 43/49DS630** series (Each models are different pin allocation but operation is same.) GK OWER Switch 28V/32V(*) Output Output 4 8,9 (Ex. TN596** ) 6 3 8,9 LD LD 6 3 STB5V Output LED Drive (Ex. TN5935** ) 3,7,5,2,3 9 LD2 2 BL_ON TV_SUB_ON 2 OWER_ON 7 VLED,2(*) STB5V LCD Module 02 0,3,5 2 4 F5V 3.3V 2V 5V 3.3V.5V.V LCD anel T-CON board NL2V 9,2,3,4 STB3.3V NL2V (*)The DC level is different by the LCD panel. 25

26 Reference : Voltage Distribution ( ++B Boards ) Ex. DX900** series B (TN6200** ) VLED(*) Output BL_ON B , ,0 5 VLED2(*) LED Drive VLED(*) LCD Module LCD anel T-CON board B6 / 3 6 / 3 B3 3 B 2 BL_ON 5 03 NL2V OWER Switch (TN699** ) Output STB5V Output -5 TV_SUB_ON OWER_ON 2 2 5VS F5V 2V 5V 3.3V.5V.V NL2V 3.3V STB3.3V (*)The DC level is different by the LCD panel. 26

27 Start up Operation- Ex. 43/49DS630** series (Each models are different pin allocation but operation is same.) FC T7202 IC720 Transformer T730Q7402/05 DC/DC IC730 24V/32V(*) Output 4 24V/ 32V(*) LD LD L783/4/ Q7804/0 (DC/DC) LED Drive IC7800 LD2 3,7,5 2 3 VLED,2(*) 6(light) 5 02 BL_ON 0 LCD Module ower For LED (Back Light) 9 LCD anel T-CON board NL2V,2,3,4 4 Output Q7403 DC/DC IC7503,2,3,3,5 7 STB5V 2 F5V STB5V 9 2 TV_SUB_ON 2 OWER_ON 4 KEY3 OWER Switch When the TV is plugged in, the power board outputs 5V for standby voltage. When the power supply receives the TV_SUB_ON signal, it outputs 2 different voltages: to the board on pins, 2, and 3 of connector 2. 24/32V to the LED backlight board on pins 8,9 of connector 4. fter board is ready to display, it outputs Backlight_on command to LD board. 27

28 Start up Operation-2 < from C plug in to : board > Ex. 43/49DS630** series ( TN596** ) D706 Rectifier ( Through ) T7202 D725 C723 ( FC = OFF C00V: 40V C240V: 330V) T730 D740/02 C7422 Q7402/05 ( OFF ) 3 node node2 7 D704, 705 R FC 7 IC720 ( OFF ) Start Vcc HO 5 LO VCC 0 IC730 4 VH FB REF Q730 Q7302 VCC feedback C730 D7408/09 C7423 IC740 24V/32V(*) Q7403 ( OFF ) LD 2 IC CE LED Drive IC7800 STB5V Cathode Tr Cathode2 Tr 5 LD C

29 Start up Operation-3 29 < from C plug in to : board > When the TV is plugged in, the rectifier start to produce DC voltage which leads through FC circuit directly to the power switches Q730, Q7302. (FC circuit IC720 does not operate at this moment.) Besides this DC voltage is provided also for D704, D705 which provide start voltage to pin of power supply IC 730. When the voltage on pin rise up to predefined value IC730 starts supplyinng of switching pulses for Q730, Q7302. Due to this current starts to lead through winding of T730 which starts to generate output voltages. One of these voltages VCC is used for power supplying of the IC 730 to its pin 0. When the power supply starts up, the is providing by D7408,09/C7423. This voltage leads to IC7503, which is 5 volts DCDC converter. This voltage (STB5V) is provided to board via connector 2 pin7. So if the TV is plugged in, STB5V is provided to board without trigger signal.

30 Start up Operation-4 < from to 2 : board > Ex. 43/49DS630** series 2 02 IC VS STB5V LCD_TV_SUB_ON K IC5000 STB3.3V IC8000 EKS 3.3V K0 Signal rocessing 7 REMOTE OWER Switch 2 4 KEY3 LED_on V LED (Each models are different pin allocation but operation is same.) North merica OFF (It can receive only ower SW) ( utomatically ) Standby (It can receive ower SW, Remote, Viera Link and so on) ower LED: OFF Except North merica ower LED: OFF ower SW on ower LED: RED 30

31 ( Reference ) Start up Operation-4 < from to 2 : board > (4K models except Taiwan, Hong Kong, Brazil and US. nd TX-**DS630 ) 3 02 IC860/ V HY3.3V LN JK8600 To WiFi adaptor JK8705/8605 IC8706/8607 5V for WiFi Enable The power line for LN/WiFi is supplied from Standby power. *) It is for ower on by pps, ower on by Easy Mirroring etc. function. Enable IC VS 9 STB5V LCD_TV_SUB_ON K IC5000 STB3.3V IC8000 EKS 3.3V 0 K0 Signal rocessing 2 7 REMOTE OWER Switch 2 2 KEY3 LED_on V LED North merica OFF (It can receive only ower SW) ( utomatically ) Standby (It can receive ower SW, Remote, Viera Link and so on) ower LED: OFF Except North merica ower LED: OFF ower SW on ower LED: RED 3

32 Start up Operation-5 < from to 2 : board > The STB5V from pin7 of connector 2 is applied to the nalog SIC (IC5000) for supplying power to the Main CU/EKS (IC8000) on the board. The nalog SIC (IC5000) converts the STB5V to STB3.3V. This voltage energize and prepare the microprocessor (CU) for program execution. The STB3.3V from the nalog SIC (IC5000) is also applied to the remote control receiver and the power LED on the K board through pin 5/8 of connector /K0. When the ower Switch on, the key3 signal is grounded. (#) The IC8000 lights on the RED LED and is ready to power on the TV by receiving the ower switch on, Remote on, Viera Link and so on. This is a standby state. (#)Only North merica model: ower switch on is no need, automatically this procedure is operated after the TV is plugged in. But the RED LED does not light. When the power on command from the power switch, the remote control and so on is provided to IC8000 EKS, IC8000 first outputs the TV_SUB_ON command. The TV_SUB_ON command is provided to power board via pin 9 of connector 2. (#) Just after transition to Stand-by mode, the TV_SUB_ON() output for few minutes. (North merica model : 0s) 32

33 Start up Operation-6 < from 2 to 3 : /LD board > Ex. 43/49DS630** series ( TN596** ) D706 Rectifier T7202 D725 C723 ( FC = ON C00V: 380V C240V: 380V) T730 SRV-VLED D740/02 C7422 Q7402/05 8,9 Q7804 L783 L784 SRV-VLED SRV-VLED2 3 node node2 7 D704, 705 R Q7202 FC 7 IC720 8 VCC Start Vcc VH 5 Q720 HO LO IC730 CS (mode change) 5 VCC 0 4 FB REF 6 Q730 Q7302 VCC feedback C730 C7303 IC740 24V/ 32V(*) D7408/09 C7423 Q LD Q780 LD SRV- 2 IC CE Vcc LED Drive IC7800 STB5V Tr Cathode2 Tr 5 BL-ON WM SRV-5.3V Cathode LD C Q7303 L=ON Standby/ON Switch Q740 (*)The DC level is different by the LCD panel. SUB-ON 9 33

34 Start up Operation-7 < from 2 to 3 : board > When the power board receives the TV_SUB_ON signal from IC8000 via pin 9 of connector 2, it outputs 2 different voltages: to the board on pins, 2 and 3 of connector 2. 24/32V(*) to the LED backlight board on pins 8,9 of connector 4. TV_SUB_ON command is carried to the primary side by C7302. This voltage is leaded to Q7303 whcih provide the mode change signal to pin 5 of IC730. Therefore the operation of the IC 730 changes the switching frequency from standby state to working state and output voltages rise up. Besides the ON command is connected to the Q7202 which provide power supply VCC of FC circuit. The FC starts to operate then. Output voltages from transformer T730 start rising up until the moment when IC740 started to operate. This IC measures the line output in the secondary side. The output of this IC is provided by C730 to pin 4 of IC730. IC730 adjust the switching frequency by this feedback signal. The TV_SUB_ON signal also switches on the Q7402/03/05 to provide output voltages ( and 24/32V(*) ) to other boards. The 24/32V(*) is provided to the LD Board for LED Backlight Drive. The is provided to the board. (*)The DC level is different by the LCD panel. 34

35 Start up Operation-8 < 3 : board (SUB voltage) > Ex. 43/49DS630** series FC LD2 LD Output 3, 7 T /32V (*) IC720 Output Transformer DC/DC T730 IC730 Q7402 /05 Q ( TN596** ) VLED/2(*) 24/32V(*) LD 4 IC7800 DCDC LED Drive 8,9 DC/DC IC7503 (*)The DC level is different by the LCD panel EKS SRV- LCD_TV_SUB_ON F5V STB5V F5V NLOG SIC DCDCEN IC5000 STB3.3V IC800 IC V HDMI3.3V 5V SUB5V IC V.8V IC570/04 SUB3.3V TU.8V IC800.V SUB.V IC80.5V SUB.5V IC

36 Start up Operation-9 36 < 3 : board (SUB voltage) > The (F5V) from the board via pin,3 and 5 of connector 02 is applied to nalog SIC IC5000 and ICs (Voltage regulators) on the board to generate the SUB-Voltages used for signal processing operation. : SUB.V,.5V, 3.3V, 5V and HDMI3.3V, TU.8V Each voltage regulators start up by high state of DCDCEN signal which is pull up to F5V. So F5V is provided to board, each SUB-voltage regulator ICs start output.

37 Start up Operation-0 < 4 and 5 : board (NL voltage) > Back Light LCD Module T-CON FC T7202 LD 24/32V(*) IC720 Output Q7402 Transformer /05 DC/DC T730 IC730 Output, 5 Q ( TN596** ) LD2 3, 7 VLED/2(*) LD 4 24/32V (*) IC7800 DCDC LED Drive 8,9 DC/DC IC7503 (*)The DC level is different by the LCD panel F5V F5V IC5500 2V NL2V anel_vcc_on2 STB5V BL_SOS EKS WM BL_ON LCD_TV_SUB_ON DCDCEN IC5000 F5V NLOG SIC 9 STB3.3V IC800 IC V HDMI3.3V 5V SUB5V IC V.8V IC570/04 SUB3.3V TU.8V IC800.V SUB.V IC80.5V SUB.5V IC

38 Start up Operation- 38 < 4 and 5 : board (NL voltage) > The F5V is also used to generate the NL-Voltage on board. IC8000 outputs the anel VCC On2 signal. IC5500 starts generating the NL2V by this signal. The NL2V is provided to T-con circuit of the LCD Module. < 6 : LD board ( backlight drive ) > fter that, IC8000 outputs the BL_ON command to the LD board through board. The BL_ON command turns on the IC7800 for LED backlight drive. Then the backlight starts lighting by WM signals, and LCD panel displays the pictures. If the backlight drive circuit does not work normally, the BL_SOS signal is informed to the IC8000. t that time, IC8000 stops outputting the TV_SUB_ON signal and blinks the red LED times.

39 Start up Operation-2 < 6 : LD board ( backlight drive ) > Ex. 43/49DS630** series ( TN596** ) D706 Rectifier T7202 D725 C723 ( FC = ON C00V: 380V C240V: 380V) T730 SRV-VLED D740/02 C7422 Q7402/05 8,9 Q7804 L783 L784 SRV-VLED SRV-VLED2 3 node node2 7 D704, 705 R Q7202 FC 7 IC720 8 VCC Start Vcc VH 5 Q720 HO LO IC730 CS (mode change) 5 VCC 0 4 FB REF 6 Q730 Q7302 VCC feedback C730 C7303 IC740 24V/ 32V(*) D7408/09 C7423 Q Q780 LD SRV- 2 IC CE Vcc LED Drive IC7800 STB5V Tr Cathode2 Tr 5 BL-ON WM SRV-5.3V Cathode LD C Q7303 L=ON Standby/ON Switch Q740 (*)The DC level is different by the LCD panel. SUB-ON 9 39

40 Simple ower On Sequence (D/DS Series) < DS/D series > (*) The DC level is different by the LCD panel. ( lug in ) C lug in STB5V output ower On Standby ower Off STB5V (form to ) 5V ower LED Green ower LED Red ower LED off ower SW on / Remote on ower LED Standby / ower on TV_SUB_ON signal FC circuit ( IC720/T720 ) start working SUB_ON (from to ) ower on (Standby) (from to ) / 32(*)V output anel_vcc_on (from to anel(tcon)) NEL_VCC_ON2 signal NL2V output NL2V (from to anel(t-con) ) 2V BL_ON_ON signal BL_ON (from to anel(backlight)) / 32(*)V up to VLED < Display start > North merica : (ower LED Green RED) (ower LED Red OFF) (ower Off no exist) VLED (from to anel(backlight) ) Ex.24V VLED 40

41 Simple ower On Sequence (DX Series) < DX series > ( lug in ) STB5V output lso is necessary before ower LED on at first time. (*) The DC level is different by the LCD panel. C lug in TV_SUB_ON signal STB5V (form to ) 5V / 32(*)V output / FC circuit start working ower On Standby ower Off SUB_ON (from to ) ower on (Standby) ower LED Red TV_SUB_OFF ower LED off TV_SUB_OFF (from to ) ower on (Standby) Stop / 32(*)V Stop / 32(*)V ower LED Standby / ower on ower LED Green NEL_VCC_ON2 signal ower SW on / Remote on anel_vcc_on (from to anel(tcon)) ower on NL2V output NL2V (from to anel(t-con) ) 2V BL_ON_ON signal BL_ON (from to anel(backlight)) / 32(*)V up to VLED < Display start > North merica : (ower LED Green RED) (ower LED Red OFF) (ower Off no exist) VLED (from to anel(backlight) ) Ex.24V VLED 4

42 (Reference : State Transition Diagram) < Except the mericas > ow-sw ower Off LED: OFF ow-sw Stand-by LED: Red Remote ower On LED: Green lug lug lug lug lug lug Out In Out In Out In C Off < The mericas > Stand-by LED: OFF ow-sw / Remote ower On LED: Red lug lug lug lug Out In Out In C Off 42

43 4. SOS rotection Circuit and Troubleshooting (Except time blink ) 43

44 LED Blinking Summary When an abnormality occurs in the unit, the SOS Detect circuit is triggered and the TV shuts down. Shut down means that turn off the TV_SUB_ON signal. The power LED on the front panel will flash a pattern indicating the circuit that has detected an abnormality. Blinking Time Detect content BL_SOS (LED driver) Model name IROM SOS = ower on problem (No F5V/SUB3.3V voltage) IROM SOS = ower on problem (No SUB5V/SUB.5V/SUB.V voltage) MT556 (D** ) --- eaks LD6 (only Euro DS6**) (occurred several sec later after power on) eaks sld8 (DS**/D**) MT580 (DX**) quick (occurred soon after power on) quick quick 3 Estimated Defect Board Memory (emmc) read problem --- quick No voltage SUB3.3V (after wake up once) udio amplifier: SOUND_SOS FRC_SOS (IC9000) anel/ / / / Speaker FN_SOS Fan/ Back End SOS (inside of eaks) Emergency SOS GCEX_SOS (IC4300) (refer to the model lineup page)

45 rotection Circuit Back Light Back Light LCD Module T-CON FC T7202 LD 24/32V(*) IC720 Output Q7402 Transformer /05 DC/DC T730 IC730 Output ( TN596** ) LD2 3, 7 VLED/2(*) LD 24/32V (*) Q7403, 5 IC7800 DCDC LED Drive 4 8,9 6 Ex. 43/49DS630** series (*)The DC level is different by the LCD panel. Tr F5V F5V IC5500 2V ON OFF IC5420 5V IC V.V.5V IC4900 M N OFF DCDCEN NL2V (OFF) (OFF) IC800 IC anel_vcc_on SOUND_SOS BL_SOS IC5000 detect 3.3V IC800 IC BL_ON LCD_TV_SUB_ON HDMI3.3V.8V IC570/04 SUB3.3V TU.8V SUB.V SUB.5V IC8000 Low voltage detect Over voltage protection SUB5V (OFF) N SOS 9 Blink Blink N SOS 7 Blink 45

46 Troubleshooting for LED Blinking ( Quick 3 time blink ) LED blinks Detail error Board may defect Quick 3 ower on problem (No F5V/SUB3.3V/SUB.5V voltage) F5V() is supplied from board. If the F5V /SUB voltage is not supplied LED blinks 3 times (quick blink). Ex. 43/49DS630** series / ower on. Check if voltage F5V at pin,3,5 of 02 connector before LED blinks? board Yes (5V) No Remove 2 connector. Check if short-circuit at pin,3,5 of 02 connector? board Yes (Shorted) No board SRV- 02 2V IC4900 M IC F5V DCDCEN IC876/5420 5V SUB5V IC8000 Q IC8705/ V IC800.V SUB3.3V SUB.V.5V IC80 SUB.5V 46

47 Troubleshooting for LED Blinking ( 9 time blink ) LED blinks Detail error Board may defect 9 udio amplifier: SOUND_SOS /Speaker udio amplifier is sourced power F5V from board. If the amplifier work abnormally (may due to short-circuit or overload), the SOUND_SOS signal will go low level and be detected by IC800 LED blinks 9 times. Ex. 43/49DS630** series Remove 2 connecter. ower on. Does LED blinks again? Yes (9 time blinks) board No (ower on) L/R speaker (wire of speaker) From BORD IC8000 IC4900 N SOS F5V M SOUND_SOS 9 Blink 47

48 Troubleshooting for LED Blinking ( only DX900 : time blink ) LED blinks Detail error Board may defect Fan_SOS Fan/ If one of the fan does not work, Fan_SOS signal will go high level and be detected by IC800 LED blinks times. only DX9** series Before shutdown, are all fans stopped? Yes (all stopped) board No (only one fan is stopped) Stopped fan.. Fan x (Low=Normal) Fan_Vcc IC8000 From BORD F5V IC590 DC/DC Fan_SOS ( all fan output low signal Low ) = Normal Blink 48

49 Troubleshooting for LED Blinking ( 5/7/0/2/3/6 time blink ) LED blinks Detail error Board may defect 5 (only Euro DS6** ) Memory (emmc: IC8903) read problem 7 No voltage SUB3.3V detected 0 (only DX*** series) FRC_SOS (Initialization of IC9000) 2 Back End SOS (inside of eaks) 3 Emergency SOS 6 (only DX9** series) GCEX_SOS (IC4300) 5 blinks is problem about memory access (IC8000 or IC8903) 7 blinks is problem about the power line of SUB3.3V. 0 blinks is problem about initialization of FRC IC (IC9000). 2 and 3 blinks is problem about IC8000 and software item. 6 blinks is problem about initialization of GCEX IC (IC4300). IN THIS CSE, BORD DEFECTS 49

50 Troubleshooting for No icture and No OSD (ower LED is lit = No blinking) Refer to the block diagram Troubleshooting for LED Blinking ( time blink ) Try the LCD anel Test Mode atterns are displayed Replace board No icture Is the power LED situation changed after pushing the button for entering Test Mode? LED blink (except TC- model) LED off (TC- model) Check if the Backlight is lit. (open the back cover and check from back side) No lit Check if voltage 24V/32V(*) at SRV-LED in board No Replace board No change (LED keep lit) Lit Yes 24V/32V(*) Replace board Confirm(Clean) the flat cable connection (between board and T-CON board of LCD anel) Replace LCD (Backlight part) anel LCD Module T-CON If entering the test mode, the ower LED will Blink(except TC- model) or OFF (TC- model). Disconnect 5/6/9 connecter(ffc cable to anel). Check if voltage SRV-2V (NL2V) in board Yes (2V) Replace LCD anel (T-CON part) No Replace board (*) The DC level is different by the LCD panel F5V IC5300 2V 9-4 NL2V anel_vcc_on2 IC8000 SRV-2V

51 Troubleshooting for No ower On (ower LED is off = No blinking) 5 < DS/D series > Check if the output of STB5V. OK Replace board NG Disconnect 02 connecter. Short check of STB5V line in board. No Shorted Replace board Shorted Replace board

52 Troubleshooting for No ower On (ower LED is off = No blinking) < DX series > DX series need both STB5V and before lighting power LED. (Refer to age4.) Check if the output of STB5V. NG Disconnect 02 connecter. Short check of STB5V line in board. Shorted Replace board DX9** 65DX8**/7** B4 OK No Shorted B Replace board Check if the output (SRV- in board) NG (DX9** = skip to below ) Disconnect B4 connecter. Short check the SRV- In board. Shorted Disconnect 02 connecter. Short check the SRV- In board. Shorted Replace board (++B) T*-65DX8**/7** T*-**DX900/ TH-55DX640/ TC-55DX700 OK No shorted No shorted (+, ++LD) T*-40,49,50DX***/ T*-58DX7**,DX8**/ TX-55DX***/ T*-55DX600,DX650 Replace B board Replace board Disconnect 02 connecter. Short check the SRV- In board. No shorted (No LD board = go to right) Disconnect LD3 connecter. Short check the SRV- in board. No shorted Replace LD board Replace board Shorted Shorted 2 Replace board 3 Replace board 02 LD3 LD 52

53 5. SOS rotection Circuit and Troubleshooting ( time blink ) 53

54 Troubleshooting for LED Blinking ( time blink ) LED blinks Detail error Board may defect T730 ( TN596** ) BL_SOS (LED driver) anel / LD / If the IC7800 detects.abnormal current of backlight LEDs ( = Backlight LED broken or Low(No) VLED voltage ) 2.abnormal DC/DC power supply of IC7800 (does not rise up the VLED voltage ) or the IC7800 does not work (No Vcc or No BL_ON/WM signal or defect itself), the IC7800 output BL_SOS signal to IC800 LED blink time. Ex. 43/49DS630** series D740/02 C V/ 32V(*) D7408/09 C7423 SRV-VLED Q7402/05 Q7403 Q740 8,9 4 8,9 LD LD Q7804 Q780 ( TN5935** ) L783 L784 Vcc SRV- LED Drive IC7800 SUB-ON Tr 58V(*) SRV-VLED SRV-VLED2 88V(*) BL-ON WM Q node node2 7 Cathode Cathode2 5 Q LD ,3,5 9 2 <++LD/LD> - (*)VLED : The DC level is different by the LCD panel. Back light LCD Module (Low=Normal) BL_SOS BL-ON WM SUB-ON LCD anel T-CON board IC8000 EKS

55 Troubleshooting for LED Blinking ( time blink ) Ex. 43/49DS630** series Refer to the previous page block diagram. <++LD/LD> -2 (ower off) Disconnect LD and LD2 connectors. Short check between pin8,9 of LD and GND, pin,5 of LD2 and GND. LL OK Connect LD and LD2 connectors. ower on. Check if the voltage of SRV-VLED, VLED2 (pin 3, 7 of LD2) before LED blink? Both OK 58V(*), 88V(*) anel Module NG NG LD board Short check between SRV- VLED, VLED2 and GND OK ower on. Check if the voltage of SRV-VLED (pin 9 of LD) before LED blink? OK 32V(*) LD board Shorted NG anel Module board (*)VLED : The DC level is different by the LCD panel. 55

56 Troubleshooting for LED Blinking ( time blink ) <++B> - Ex. DX900** series B VLED ,0 LCD Module ower IC hoto coupler SRV-VLED2 B2 node Back light LCD anel SRV-VLED VLED B LED Drive IC Cathode T-CON board 9,0 ower IC (TN6200) (TN699) hoto coupler BL-ON SRV-BL-ON B3 3 Sync/control/ BL_SOS 5 BL-ON 2,4,6,,, Tr 03 IC9000 FRC BL_SOS (Low=Normal) IC8000 MTK ower IC hoto coupler SUB-ON (*)VLED : The DC level is different by the LCD panel. SUB-ON 56

57 Troubleshooting for LED Blinking ( time blink ) Ex. DX900** series Refer to the previous page block diagram. <++B> -2 ower on. Check if the voltage of SRV-VLED(pin7-28 of B) and SRV-VLED2 (pin7-28 of B2) before LED blink? Both OK 58V(*), 88V(*) anel Module NG (ower off) Disconnect B and B2 connector. Short check between SRV- VLED, VLED2 and GND OK Check if the voltage of SRV-BL-ON (pin 5 of B) before LED blink? OK 3.3V anel Module Shorted NG B Module Check if the voltage of BL_ON (pin 5 of 03) before LED blink? OK 3.3V anel Module NG board (*)VLED : The DC level is different by the LCD panel. 57

58 Troubleshooting for LED Blinking ( time blink ) <+> - Ex. 32D400/40, 32DS500/600 series T730 D7507/08 C7502 Q750 24/32V(*) L780 SRV-VLED 70V(*) 3 node 3 Back light LCD Module LCD anel Q780 D7502 C752 Q7502 Vcc LED Drive IC7800 Q7803 Cathode 2 (Low=Normal) 02 8 (Low=Normal) BL_SOS T-CON board ( TN4G572** ) Q750 SRV- SUB-ON WM BL-ON ,2,3,3,5 8 2 WM BL-ON SUB-ON IC8000 EKS (*)VLED : The DC level is different by the LCD panel. 58

59 Troubleshooting for LED Blinking ( time blink ) <+> -2 Ex. 32D400/40, 32DS500/600 series Does the blinking start soon after power on? Yes No (after several sec.) (ower off) Disconnect 3 connectors. Short check between pin,3 of 3 and GND. Short Both OK Connect 3 connector. ower on. Check if the voltage of SRV-VLED(pin 3 of 3) before LED blink? NG OK 70V(*) anel Module (#Euro DS6** model only) Go to troubleshoot of quick 3 time blink page (check with that procedure) board Short check between SRV- VLED and GND OK board Shorted anel Module (*)VLED : The DC level is different by the LCD panel. 59

60 Backlight Drive Structure - D4** DS4**/5**/6** DX6**/7**/8** (4K) 24inch inch + / (India : Board) inch LD inch ++LD ++LD inch ++LD ++LD inch DX900 (4K) 55inch LD +, ++B: (only TH-55DX640*, TC-55DX700*) 58inch B 65inch LD ++B ++B Except K, GK boards 60

61 Backlight Drive Structure -2 <. + > 24/32V(*) BL_ON LED Drive, STB5V VLED(*) LCD anel Module Dr Backlight LCD anel < LD/LD > 24/32V(*) BL_ON, STB5V LD/ LD LED Drive VLED(*) LCD anel Module Dr Backlight LCD anel IC8000 (eaks/mtk ) Resize I conv. NL2V T-CON Dr IC8000 (eaks/mtk ) Resize I conv. NL2V T-CON Dr <. 3 ++B board > (DX6**/7**) (DX900) 390V B 24/32V(*) BL_ON LED Drive VLED(*) LCD anel Module Backlight 390V B VLED/2 LED Drive LCD anel Module Backlight, STB5V Dr LCD anel, STB5V Dr LCD anel IC8000 (eaks/mtk ) Resize I conv. NL2V T-CON Dr IC8000 (eaks/mtk ) Resize I conv. BL_ON NL2V (*)The DC level is different by the LCD panel. 6 T-CON Dr