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LG 42LG60 Series, Training Manual

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LG 42LG60 Series Training Manual Download Page 20

20 

 

Fall 2008 LCD Training

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Fall 2008 LCD Training

CIRCUIT DeSCRIPTIONS

POwER SUPPlY CONNECTORS

P201 “SMPS” to P800 “Main”

Pin Label

Stby

Run  Diode Check

Pin

Label

Stby

Run  Diode Check

23

N/C

0V

3.2V

OL

24

N/C

0V

0V

OL

21

BR1

0V

1.68V

OL

22

PWM-DIM

0V

3.38V

OL

19

PWR

0V

2.86V

OL

20

INV On/Off

0V

3.29V

OL

17

ERR

0V

3.3V

1.26V

18

ACD

5.05V 4.57V

OL

15

Gnd

Gnd

Gnd

Gnd

16

Gnd

Gnd

Gnd

Gnd

13

Gnd

Gnd

Gnd

Gnd

14

Gnd

Gnd

Gnd

Gnd

11

5.2V

5.15V 5.15V

0.34V

12

5.2V

5.15V 5.15V

0.34V

9

5.2V

5.15V 5.15V

0.34V

10

5.2V

5.15V 5.15V

0.34V

7

Gnd

Gnd

Gnd

Gnd

8

Gnd

Gnd

Gnd

0V

5

12V

0V

11.8V

1.69V

6

12V

0V

11.8V

1.69V

3

Gnd

Gnd

Gnd

Gnd

4

Gnd

Gnd

Gnd

Gnd

1

16.5V

0V

16V

0.31V

2

16.5V

0V

16V

0.31V

BR1 Pin 21 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%

P203 “SMPS” to MCN1 “Ballast”

Pin

Label

STBY

Run 

Diode Check

1

24V

0V

24.52V

0.33V

2

24V

0V

24.52V

0.33V

3

24V

0V

24.52V

0.33V

4

24V

0V

24.52V

0.33V

5

24V

0V

24.52V

0.33V

6

Gnd

Gnd

Gnd

Gnd

7

Gnd

Gnd

Gnd

Gnd

8

Gnd

Gnd

Gnd

Gnd

9

Gnd

Gnd

Gnd

Gnd

10

Gnd

Gnd

Gnd

Gnd

11

BR1

0V

1.67V

OL

Summary of Contents for 42LG60 Series

Page 1: ...42LG60 LG TRAINING MANUAL Fall 2008 LCD Training LG TRAINING MANUAL 32LG40 ...

Page 2: ... conductive surface such as an ESD mat to prevent electrostatic charge buildup or exposure of the assembly Use only a grounded tip soldering iron to solder or unsolder ES devices Use only an anti static solder removal device Some solder removal devices not classified as anti static can generate electrical charges sufficient to damage ES devices Do not use refrigerant propelled chemicals which can ...

Page 3: ...wer Supply SMPS Removal 40 Main Board Removal 40 control Board Removal 41 LCD Driver Board Removal 41 Speaker Box Removal 42 Exploded View 43 Circuit Descriptions 42LG60 45 Introduction 45 Backlight Layout 46 Power Supply Layout 47 Control Board Layout 49 LCD Driver T CON Layout 51 Main board layout 53 Invisible Speaker SyStem Layout 61 Schematics 63 32LG40 Interconnect 63 32LG40 WaveForms 64 32LG...

Page 4: ... 4 ...

Page 5: ...ctric material and give off a distinct odor Frequency of power supplies will change with the load or listen for relay closing etc Observation of the front Power LED may give some clues Localize After carefully checking the symptom and determining the circuits to be checked and after giving a thorough examination using your senses the first check should always be the DC Supply Voltages to those cir...

Page 6: ...mbers Ex March 2004 3 Be cautious of electric shock from the Backlight section it uses high voltage AC Check that the Power Supply and Drive Circuits are completely discharged because of residual current stored before circuit board removal 4 C MOS circuits are sensitive to static electricity Use caution when dealing with these IC and circuits 5 Exercise care when making voltage and waveform checks...

Page 7: ...nse Time GTG 8ms 5m s USB Port USB Flash Drive Support Yes Yes MP3 JPEG No Yes Video No Dvix Only HDMI Support HDMI 1 3 with Deep Color Yes Yes Simplink HDMI CEC Yes Yes Cabinet Front Cabinet Style Glossy Black Glossy Black Rear Cabinet Style Matte Black Red Glossy Red Speaker Invisible Speaker Invisible Speaker RoHS Yes Yes VESA Compatible 200 x 200 200 x 200 Wall Mount Model RW 230 AW 47LG30F Po...

Page 8: ...No Serial No Side Label 12 304 8mm 17 1 434 34mm 24 8 629 92mm 4 3 109mm 11 8 299 7mm Not Center Center 3 9 100mm 42LG60 Dimensions 42LG60 Dimensions 7 9 200mm 29 4 746 76mm 14 7 373 38mm 40 9 1038 86mm Remove 4 screws to remove stand for wall mount Model No Serial No Label 15 8 402mm 20 5 520 7mm 31 3 795mm 2 4 60 96mm 14 9 376 46mm Center 3 9 100mm 6 6 168 78mm 8 204 4mm 11 85 301mm 1 94 49 2mm ...

Page 9: ... including brightness contrast color sharpness and white balance The result is a picture optimized for its surroundings more pleasing to watch It can also save up to 50 in power consumption since the screen will brighten and dim to match ambient lighting TruMotion 120Hz Advance 120Hz panel provides clear smooth images even during fast action scenes creating a stable structure for a crisper picture...

Page 10: ... is held down If the TV asks for a password enter 0000 four zeros Model On Stand By TYP MAX UNIT TYP MAX UNIT 19LS4D UA 42W 0 85 1W 20LS7D NB 56W 0 85 1W 20LS7D UK 56W 0 85 1W 22LC2D UB 46W 0 85 1W 22LS4D UA 46W 0 85 1W 23LS7D NB 78W 0 85 1W 23LS7D UK 78W 0 85 1W 26LC7DC UB 110 160W 0 7 1W 26LC7DC UK 30 160W 0 7 1W 26LC7D UK 30 160W 0 7 1W 26LG30DC UA 99 115W 0 36 0 8W 32LC4D UA 150 190W 0 7 1W 32...

Page 11: ...o adjust the volume or accurately control a specific function 22 ENTER To set a specific function or complete setting 23 PIP CH OP1 To move the channel down in the PIP screen To use as a red key in the teletext mode 24 PIP CH OP2 To move the channel in the PIP screen To use as a green key in the teletext mode 25 PIP SWAP OP3 To switch between the main and sub screens To use as a yellow key in the ...

Page 12: ...t OPTION Now press the Fav key 7 times and the upgrade menu will open 4 Select START and press ENTER on the remote to start the software upgrade 5 The TV will copy the update from the drive and then install it Do not turn the TV off until it is finished 6 The TV will automatically turn off and back on after the upgrade is successfully finished 7 Check the firmware version to verify the update was ...

Page 13: ...move the 18 screws shown Pay attention to the size and type of screw as there are many different types Putting in the improper screw when reassembling may cause damage The stand does not need to be removed LCD Driver T CON Power Supply Side Inputs Main Digital Board Ballast Front Keypad DVD Player Keypad Board Layout ...

Page 14: ...op and bottom screws Remove the remaining 6 screws and remove the shield covering the Main board Careful at this point the board will swing free of the supports Disconnect P902 P800 P901 P900 P904 P401 and P500 Note In the top right is connector P200 This is an open connection for software upgrades Remove the 2 screws securing the Side input decorative plastic piece on the right Finally remove the...

Page 15: ...w Remove Screw Remove Screws and Remove Brace Remove Screw LCD Driver Removal Remove the screws and then the brace Carefully remove the LVDS cable and then the board If just removing the shield and not the board re install the 3 screws that held the shield on to establish ground Remove LVDS Cable ...

Page 16: ...ssembly Ballast Removal Remove the shield and then the ballast Be sure all heat sinks and insulators are in place when re assembling Protects the Outputs Insulator Insulator Shiny Side Down Conductive Cut Out Alignment Notch Alignment Notch Heat Transfer Material Shield ...

Page 17: ...yer Removal Disconnect CN400 CN401 and CN402 Now the DVD Player can be removed CN400 CN401 CN4002 This screw hidden by tape in previous photo Step2 DVD Player Removal Remove the tape and then remove the 8 screws holding the DVD Player in place Remove Tape Remove Tape CN402 CN400 CN401 ...

Page 18: ...17 Bracket Assembly BRACKET 32LG40 LA89A DVDP SIDE AV BRACKET ASSY 530 EAY40504401 SMPS AC DC 08H 3237 90VTO264V 180W 50 60Hz UL CSA SEMKO Yuy 531 MGJ42154602 Plate Metal PRESS SBHG 0 5T SHIELD SPTE METAL POWER board 3 540 EBU43499001 Main Total Assembly 32LG40 UA BRAND LA89A 550 EBT50140201 Chassis Assembly POWER SMPS LA89A AC INLET Assy for 32LG40 UA 560 EBT43504901 Chassis Assembly SUB LA89A 32...

Page 19: ...19 Circuit descriptions Circuit descriptions 32LG40 F101 3 15A 250V 250V P201 To Main AC In F100 5A 250V Warning Hot Ground P203 To Ballast Power Supply SMPS No Connection F101 3 15A 250V 250V P201 To Main AC In F100 5A 250V Warning Hot Ground P203 To Ballast 1 1 ...

Page 20: ...d Gnd Gnd Gnd 11 5 2V 5 15V 5 15V 0 34V 12 5 2V 5 15V 5 15V 0 34V 9 5 2V 5 15V 5 15V 0 34V 10 5 2V 5 15V 5 15V 0 34V 7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd 0V 5 12V 0V 11 8V 1 69V 6 12V 0V 11 8V 1 69V 3 Gnd Gnd Gnd Gnd 4 Gnd Gnd Gnd Gnd 1 16 5V 0V 16V 0 31V 2 16 5V 0V 16V 0 31V BR1 Pin 21 can vary according to OSD Backlight setting 0 9V 0 to 3 3V 100 P203 SMPS to MCN1 Ballast Pin Label STBY Run Diode Che...

Page 21: ... high Fuse F101 Check for 350V Ballast Voltage If any voltage missing replace the Power Supply If the 1st test was successful leave the 10K resistor in place Backlight test To test the Backlights leave the 10K jumper in place from the previous test Plug in the Backlight plug P203 and apply AC power Observe the Backlights If normal LED1 on the Ballast board should turn on first then the backlights ...

Page 22: ...1V 3 41V 3 3V_MICON IN 1 5V 0V 5V IN 2 RUN STBY NAME FUNCTION PIN RUN STBY NAME FUNCTION PIN RESET GENERATOR FOR Q400 IC405 USB Power IC201 3 39V 0V Reset Lo Hi OUT 3 9V 0V 9V OUT 3 Gnd Gnd Gnd Gnd 2 Gnd Gnd Gnd Gnd 2 3 4V 0V D3 3V_BCM IN 1 12V 0V 12V IN 1 RUN STBY NAME FUNCTION PIN RUN STBY NAME FUNCTION PIN RESET GENERATOR TO IC401 On Back IC400 9V Regulator IC803 1 29V 0V DDRO_VTT On Off Contro...

Page 23: ...ontrol 1 RUN STBY NAME FUNCTION PIN RUN STBY NAME FUNCTION PIN 5V SUB SWITCH Q801 D3 3V A3 3V_BCM Regulator turns on LD800 IC806 Gnd Gnd Gnd Gnd 11 18 19 20 n c n c n c n c 14 15 2 66V 0V D2 6V_BCM OUT 1 2 3 4 5 3 41V 0V Power_CTL_2 6V On Off Control 17 4 98V 0 36V 5V_SUB IN 6 7 8 10 Gnd Gnd Gnd Gnd E RUN STBY NAME FUNCTION PIN 0V 0V 3 3VVST_MICON Vcc C D2 6V A2 6V_BCM Regulator IC809 0 6V 0 6V Re...

Page 24: ...1 Screen Print for Pin No is incorrect use IC Gnd Gnd Gnd Gnd 11 12 18 19 20 0V 0V n c n c 13 14 15 16 12 36V 0V LVDS 12V OUT 5 6 7 8 1 29V 0V D1 2V_BCM OUT 1 2 3 4 5 6 16V 0V Q900 On Off Control 2 4 3 41V 0V Power_CTL_1 2V On Off Control 17 12 36V 0V 12V IN 1 3 5V 0 38V 5V_SUB IN 6 7 8 10 RUN STBY NAME FUNCTION PIN RUN STBY NAME FUNCTION PIN LVDS 12V SWITCH Q901 D1 2V A1 2V BCM REGULATOR IC805 0V...

Page 25: ... the shield off the tuner If you leave the shield on you can still access the same pins Be careful not to accidentally ground out you test lead on the shield Pin 16 Composite Video Pin 14 Audio SIF Pin 3 Tuner B 5V MAIN PWB 1Vp p 20uSec rate Pin 16 Video Signal 1Vp p 20uSec rate Pin 16 Video Signal Pin 14 SIF Signal 850mVp p 20nSec rate ...

Page 26: ...or output Check pins 1 1 20 This signals vary but looking for signals like the ones shown below on any of these pins will confirm the output of video content This signal is using a standard SMTE Color Bar output from a generator as the input source Remember there are actually 10 pins with LVDS signals This only represents two waveforms as an example P902 Location Pin 11 Pin 16 MAIN PWB ...

Page 27: ...f 0V 3 29V 2 15V 12 Gnd 0V 0V Gnd 21 BR1 0V 1 68V OL 13 LED G 0V 2 1V 0 8V 22 VBR B 0V 3 38V 2 15V 14 LED R 2 1V 0V 0 8V 23 n c 0V 3 2V OL 15 Gnd 0V 0V Gnd 24 n c 0V 0V OL ADIM Pin 21 varies according to OSD Backlight setting 0 9V 0 to 3 3V 100 P904 Main to CN401 DVD Player Pin Label Stby Run Diode Check Pin Label Stby Run Diode Check 1 n c 3 34V 3 34V OL 14 n c 0V 0 7V OL 2 Disc Check 3 34V 3 4V ...

Page 28: ...P902 Main to CN1 T CON Pin Label SBY Run Diode Check Pin Label SBY Run Diode Check 1 LVDS 12V 0V 12 3V OL 2 LVDS 12V 0V 12 3V OL 3 LVDS 12V 0V 12 3V OL 4 LVDS 12V 0V 12 3V OL 5 Gnd 0V 0V Gnd 6 Gnd 0V 0V Gnd 7 Gnd 0V 0V Gnd 8 Gnd 0V 0V Gnd 9 Gnd 0V 0V Gnd 10 Gnd 0V 0V Gnd 11 LVDS 0V 1 2V 0 98V 12 LVDS 0V 1 1V 0 98V 13 LVDS 0V 1 2V 1 11V 14 LVDS 0V 1 05V 1 06V 15 LVDS 0V 1 1V 1 06V 16 LVDS 0V 1 09V ...

Page 29: ...4V 2 78V 2 SCL 0V 5V OL 3 L 0V 8 15V 2 78V 3 SDA 0V 5V OL 4 L 0V 8 15V 2 78V 4 Gnd 0V 0V Gnd P900 Main to P402 DVD Player Pin Label Stby Run Diode Check 1 Disk Enable 3 4V 3 4V No Disc 0V Disc In 1 68V 2 DVDP RXD 0 7V 3 08V 3V 3 DVDP TXD 0 7V 3 4V 3V 4 Gnd Gnd 0V Gnd P901 Main to CN400 DVD Player Pin Label Stby Run Diode Check 1 12V 0V 12 3V 3V 2 Gnd 0V 0V Gnd 3 DVDP 3 3V 3 4V 3 37V 099V 4 Gnd 0V ...

Page 30: ...D Training circuit descriptions MCN1 To Backlight Right Side To Backlight Left Side Transformers Ballast Start Det LED LED1 F1 8A 125V Ballast Assembly MCN1 Ballast Start Det LED LED1 To Backlight Right Side To Backlight Left Side Transformers F1 8A 125V ...

Page 31: ... 22 2V p p 220kHz Primary Side Protects the Outputs Insulator Insulator Shiny Side Down Conductive Cut Out Alignment Notch Alignment Notch Heat Transfer Material Shield MCN1 Ballast to P203 SMPS Pin Label Stby Run Diode 1 VBL 0V 24 52V OL 2 VBL 0V 24 52V OL 3 VBL 0V 24 52V OL 4 VBL 0V 24 52V OL 5 VBL 0V 24 52V OL 6 Gnd Gnd Gnd Gnd 7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd 9 Gnd Gnd Gnd Gnd 10 Gnd_1 Gnd ...

Page 32: ...the screws for grounding purposes Use the Connector P902 on the Main board for Voltages and Signal readings LVDS Cable To remove press in from the sides and lift out Be careful when removing press the release tabs to avoid damage to the board or the cable CN2 CN3 CN1 LVDS US2 To Main To TFT Panel To TFT Panel 3 0 0V 2 1 8V 1 3 3V US2 12V F1 6 3V 1 5A Press in Press in ...

Page 33: ...VDS 12V 0V 12 3V OL 3 LVDS 12V 0V 12 3V OL 4 LVDS 12V 0V 12 3V OL 5 Gnd 0V 0V Gnd 6 Gnd 0V 0V Gnd 7 Gnd 0V 0V Gnd 8 Gnd 0V 0V Gnd 9 Gnd 0V 0V Gnd 10 Gnd 0V 0V Gnd 11 LVDS 0V 1 2V 0 98V 12 LVDS 0V 1 1V 0 98V 13 LVDS 0V 1 2V 1 11V 14 LVDS 0V 1 05V 1 06V 15 LVDS 0V 1 1V 1 06V 16 LVDS 0V 1 09V 1 05V 17 LVDS 0V 1 08V 1 11V 18 LVDS 0V 1 13V 1 06V 19 LVDS 0V 1 14V 1 11V 20 LVDS 0V 1 06V 1 06V 21 n c 0V n...

Page 34: ... 3 34V 0V 3 13V 15 nc 0V 0V Gnd 3 nc 3 34V 3 3V 3 13V 16 SPDIF 3 38V 1 8V OL 4 nc 3 34V 3 3V 2 34V 17 DVDP MUTE 0V 0V 2 3V 5 Gnd Gnd Gnd Gnd 18 DVDP L 0V 2 4V 1 1V 6 DVDP Pr 0V 0 8V OL 19 Gnd 0V 0V Gnd 7 DVDP Pb 0V 0 8V OL 20 DVDP R 0V 2 4V 1 1V 8 DVDP Y 0V 0 6V OL 21 nc 0V 0V OL CN400 DVD to P901 Main CN402 DVD to P900 Main Pin Label Stby Run Diode Check Pin Label Stby Run Diode Check 1 P12V 0V 1...

Page 35: ...Training 35 3 2 L G 4 0 Fall 2008 LCD Training 35 Circuit descriptions Front Board FRont view REar View J2 J1 To Main PWB To Side Keys PWB ZD3 3 4V Zener ZD1 5V Zener ZD2 4 1V Zener POWER BUTTON IR Receiver POWER LED ...

Page 36: ...1V OL 6 Gnd 0V 0V Gnd 7 Key 4 3 41V 3 41V OL 8 Gnd 0V 0V Gnd J1 Front board to P401 Main J2 Front board to P101 Side Key Pin Label Stby Run Diode Check Pin Label Stby Run Diode Check 1 KEY3 3 4V 3 4V OL 1 Key 1 3 4V 3 4V OL 2 KEY4 3 4V 3 4V OL 2 Gnd 0V 0V Gnd 3 Gnd 0V 0V Gnd 3 Key 2 3 41V 3 41V OL 4 Gnd 0V 0V Gnd 4 Gnd 0V 0V Gnd 5 KEY 1 3 4V 3 4V OL 5 Key 3 3 41V 3 41V OL 6 KEY 2 3 4V 3 4V OL 6 Gn...

Page 37: ...Fall 2008 LCD Training 37 3 2 L G 4 0 Fall 2008 LCD Training 37 Circuit descriptions Invisible Speaker System Bottom View of Woofer Ports Woofers Tweeters Tweeters Stand Removed ...

Page 38: ... 38 ...

Page 39: ...ack cover Removal Remove the 13 screws shown Pay attention to the size and type of screw as there are different types Putting in the improper screw when reassembling may cause damage Handle the TV carefully while the 4 stand screws are removed The stand fits snuggly but could fall out and cause injury For safety put the 4 stand screws back after removing the back cover Board layout LCD Driver T CO...

Page 40: ...on Remove the 2 screws securing the Side input decorative plastic piece on the right Remove the 6 screws securing the Main board indicated below The Main board can also be lifted off the mounting frame by disconnecting P401 and P501 Remove the 1 screw securing the top mounting frame and swing the board away Power Supply SMPS Removal Disconnect P2 AC In P402 and P402 Remove the 6 screws indicated b...

Page 41: ...ve the LVDS cables by pressing in from the sides to release and then lift them out Be careful when removing the LVDS Cables they re fragile Press the release tabs to avoid damage to board or to the cable itself Remove the 4 screws indicated below LCD Driver Board Removal Disconnect CN1 CN2 CN3 and CN4 Remove the 3 screws indicated below ...

Page 42: ...all 2008 LCD Training Disassembly To Tweeters Speaker Box Removed Speaker Box Removal To remove the Speaker Box remove the 4 screws show in circles Then remove the wire harness Carefully disconnect both Tweeters Unplug P500 from the Main board ...

Page 43: ...ED CA Soft touch co 520 ABA35569906 Bracket Assembly BRACKET LG70 AB Side AV bracket assy CHICAGO_120 521 MGJ40651702 Plate Shield PRESS SPTE 0 3T SHIELD SPTE SIDE AV for SKD 530 EAY40505301 SMPS AC DC 08H 4247 90VTO264V 400W 50 60Hz UL CSA SEMKO Yu 540 EBU50595701 Main Total Assembly 47LG70 UA SUSQLJM BRAND LA86A 550 EBT43368401 Chassis Assembly POWER SMPS 47inch LG30 50 AC INLET 150_straig 810 M...

Page 44: ... 44 ...

Page 45: ...riptions Circuit Descriptions 42LG60 Introduction LCD Driver T CON Backlight Connection Control Board Power Supply Main Board Backlight Connection LVDS Cables With shield removed Tuner Digital Audio Opitcal Audio Remote In Component Y Pr Pb HDMI 1 2 3 PGB PC Audio PGB PC RS 232 ...

Page 46: ...46 Fall 2008 LCD Training 4 2 L G 6 0 46 Fall 2008 LCD Training circuit descriptions Backlight Layout Back View 18 Bulbs Power Supply with Ballast To Backlights Over 1 2KV 58Khz ...

Page 47: ... Check 1 16V 0V 16V 0 94V 2 16V 0V 16V 0 94V 3 Gnd Gnd Gnd 0V 4 Gnd Gnd Gnd 0V 5 12V 0V 11 8V 1 32V 6 12V 0V 11 8V 1 32V 7 Gnd Gnd Gnd 0V 8 Gnd Gnd Gnd 0V 9 5V 5V 5 15V 1 49V 10 5V 5 15V 5 15V 1 49V 11 5V 5V 5 15V 1 49V 12 5V 5 15V 5 15V 1 49V 13 Gnd Gnd Gnd 0V 14 Gnd Gnd Gnd 0V 15 Gnd Gnd Gnd 0V 16 Gnd Gnd Gnd 0V 17 ERR 3 19V 3 3V OL 18 ACD 4V 4 57V 1 85V 19 PWR 0V 2 86V OL 20 INV 0V 3 29V OL 21 ...

Page 48: ...light right side or left side confirm the connectors are ok Check the Transformer left and right center pins for a signal If ok the panel is defective due to a backlight failure If the pulse is missing on one side L or R center legs of the transformer the power supply is defective If there is no backlight activity confirm the Fuse F700 has approx 300V on both sides If only on one side check fuse f...

Page 49: ...Fall 2008 LCD Training 49 4 2 L G 6 0 Fall 2008 LCD Training 49 Circuit descriptions ContrOl Board Layout To LCD Driver T CON P104 P103 P101 LVDS P102 To Main Control Board Regulators ...

Page 50: ...ignal selected while pressing the Menu button on and off with the remote control or keypad Loss of these signals would confirm the failure is on the Main board To remove the connector press the two outside tabs inward and pull Control board crystal test The Control board contains the MICRONAS chip IC101 This IC is a Full HD Rate Converter with Motion Blur Removal and Film De Juddering for 1080p 10...

Page 51: ...Fall 2008 LCD Training 51 4 2 L G 6 0 Fall 2008 LCD Training 51 Circuit descriptions LCD Driver T CON Layout CN1 To LCD Panel To Control Board CN2 CN5 CN4 U15 U16 UC1 F1 US1 LD1 ...

Page 52: ...voltage LD1 1 8V US1 0V 3 2V Use LD1 to determine if The boot up sequence of The T CON is OK If all is OK this LED will turn bright blue shortly after power is applied then go out shortly after backlights illuminate F1 CN1 LCD Driver LED Status Power Off Power 1st On Power On Anode 0V Anode 11 6V Anode 11 6V Cathode 0V Cathode 0V Cathode 9 5V LED OFF LED ON LED OFF ...

Page 53: ...descriptions Main board layout If odd video problems are found use some freeze spray on IC100 and its circuits If the video returns to normal the board needs to be replaced P801 Power Supply P800 P900 To Control Board P401 To Control Panel P501 To Speakers P200 Empty IC100 ...

Page 54: ...3V 0V 1 8V 3 31V 1 2 3 SBY RUN BCM Reset IC100 Video Processor IC400 0 4V 0V 0 4V 3 37V 0V 3 39V 1 2 3 SBY RUN IC805 0 V 0V 0V 0 4V 0 1V 3 3V BCM 5V 0V 3 39V 1 2V 1 2 3 4 5 IC802 0V 0 3V 0V 5V 3 3V 0V 1 2 3 SBY RUN IC101 Use the left side of L206 Micro Crystal Video Crystal Only when set is on 780 mVp p 54 Mhz Set is on or off 2 4 Vp p 24 Mhz Main board Crystal Check ...

Page 55: ...is illuminated 3 3V is ok Only half of the dual LED is used Main board Tuner Check For easy access pop the shield off the tuner If you leave the shield on you can still access the same pins but be careful not to accidentally ground out your test lead on the shield Note This is a picture from a different model but the concept is the same Pin 14 Audio SIF Pin 16 Composite Video Pin 14 Pin 16 Pin 3 T...

Page 56: ...ate 1Vp p 20uSec rate Main board LVDS P900 Check To confirm that the Main board is outputting Picture Content signals check P900 LVDS cable for output Check 1 1 22 and 27 38 This signals vary but looking for signals like the ones shown below on any of these pins will confirm the output of video content This signal is using a standard SMTE Color Bar output from a generator as the input source Below...

Page 57: ... 1 14V 1V 13 0V 1 11V 1V 14 0V 1 11V 1V 15 0V 1 12V 1V 16 0V 1 05V 1V 17 0V 1 11V 1V 18 0V 1 11V 1V 19 0V 1 16V 1V 20 0V 1 07V 1V 21 0V 1 14V 1V 22 0V 1 05V 1V 23 0V 0V OL 24 0V 3 25V 1 28v 25 0 5V 3 15V 2 98V 26 0V 3 3V 3V 27 0V 1 14V 1V 28 0V 1 14V 1V 29 0V 1 12V 1V 30 0V 1 09V 1V 31 0V 1 14V 1V 32 0V 1 07V 1V 33 0V 1 07V 1V 34 0V 1 13V 1V 35 0V 1 16V 1V 36 0V 1 07V 1V 37 0V 1 16V 1V 38 0V 1 07V...

Page 58: ... 19 PWR 0V 2 86V OL 20 INV 0V 3 29V OL 21 ADIM 0 1V 1 68V OL 22 PDIM 0V 3 38V OL 23 SEL 0V 3 2V OL 24 SYNC 0V 0V OL Not Used ADIM Pin 21 can vary according to OSD Backlight setting 0 9V 0 to 3 3V 100 P401 MAIN to Front Keys Pin Stby Run Diode Check 1 3 25V 3 25V 2 26V 2 3 25V 3 25V 2 26V 3 0V 0V Gnd 4 0V 0V Gnd 5 3 3V 3 3V 1 85V 6 3 3V 3 3V 1 85V 7 3 3V 3 3V 0 71V 8 5V 5V 1 47V 9 0V 0V Gnd 10 3 92...

Page 59: ...h J1 Front PWB Assembly To Main FRont Control Assembly The Intelligent Sensor and IR Sensor are located on the front of this board J3 J2 J1 To Front Touch LED PWB To Main PWB To Side Key Control PWB Right Tweeter Light Diffuser for the Intelligent Sensor Light Diffuser for the Intelligent Sensor IR Sensor ...

Page 60: ...y Run 1 3 3V 3 3V 1 3 25V 3 25V 2 3 3V 3 3V 2 3 25V 3 25V 3 5V 5V 3 0V 0V 4 0V 0V 4 0V 0V 5 0V 0V 5 3 3V 3 3V 6 0V 0V 6 3 3V 3 3V 7 3 3V 3 3V 7 3 3V 3 3V 8 0V 0V 8 5V 5V 9 3 3V 3 3V 9 0V 0V 10 3 92V 3 92V J3 Ft Control to P100 Side Ctrls 11 0V 0V Pin Stby Run 12 0V 0V 1 3 3V 3 3V 13 0V 0V 2 0V 0V 14 0V 0V 3 3 3V 3 3V 15 0V 0V 4 0V 0V To Front Control PWB P100 Side Control Panel ...

Page 61: ... 2008 LCD Training 61 4 2 L G 6 0 Fall 2008 LCD Training 61 Circuit descriptions Invisible Speaker SyStem Layout Right Tweeter Left Tweeter Right Speaker Box Left Speaker Box To Tweeters Speaker Box Removed ...

Page 62: ......

Page 63: ......

Page 64: ...Fall 2008 LCD Training ...

Page 65: ... 3 1V IC802 4 OUT D3 3V_BCM 0 1V 3 4V Q802 IC304 PIN FUNCTION NAME STBY RUN IC807 PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN 1 Gnd 3 3V 0V 5V PIN FUNCTION NAME STBY RUN B On Off Control RL_ON 0V 3 29V 3 8 OUT DDRO_VTT 0V 1 29V 2 OUT Gnd Gnd Gnd 1 IN 9V 0V 8 9V C Pull Down ST_5V 0V 5V 5 6 7 IN D2 6V_BCM 0V 2 6V 3 IN 5V_SUB 0V 3 2V 2 On Off Control Power_CTL_3 3V 0V 3 4V E Gnd Gnd Gnd Gnd...

Page 66: ...2 WAVEFORMS 32LG40 LVDS CABLE WAVEFORMS Waveforms taken using SMTP Color Bar input All readings give the Scale and Time Base related to scope settings Top waveform in each image gives a slower rate 10mV at 5uS per division Bottom waveform shows a blow up sample 10mV at 2uS per division ...

Page 67: ...ematics 69 3 2 L G 4 0 32LG40 Main Board Main Micro Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only The symbol refers to safety components Only replace with LG parts ...

Page 68: ...PDP Training Fall 2008 70 Schematics 70 3 2 L G 4 0 32LG40 Main Board Audio The symbol refers to safety components Only replace with LG parts ...

Page 69: ...chematics 71 3 2 L G 4 0 32LG40 Main Board Memory Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only The symbol refers to safety components Only replace with LG parts ...

Page 70: ...tics 72 3 2 L G 4 0 32LG40 Main Board BCM USB Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only The symbol refers to safety components Only replace with LG parts Side USB ...

Page 71: ...Schematics 73 3 2 L G 4 0 32LG40 Main Board DCM Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only The symbol refers to safety components Only replace with LG parts ...

Page 72: ...PDP Training Fall 2008 74 Schematics 74 3 2 L G 4 0 32LG40 Main Board LVDS DVD The symbol refers to safety components Only replace with LG parts ...

Page 73: ...ng Fall 2008 75 Schematics 75 3 2 L G 4 0 32LG40 Main Board Tuner Power Copyright 2008 LG Electronics Inc All right reserved LGE Internal Use Only The symbol refers to safety components Only replace with LG parts ...

Page 74: ...PDP Training Fall 2008 76 Schematics 76 3 2 L G 4 0 32LG40 Main Board JackpackS Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 75: ...PDP Training Fall 2008 77 Schematics 77 3 2 L G 4 0 32LG40 Main Board HDMI Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only HDMI 1 HDMI 2 ...

Page 76: ... 5V 5V 5 15V 11 5V 5V 5 15V 13 Gnd Gnd Gnd 15 Gnd Gnd Gnd 17 ERR 3 19V 3 3V 19 PWR 0V 2 86V 21 ADIM 0 1V 1 68V 23 SEL 0V 3 2V Pin Label STBY Run 2 16V 0V 16V 4 Gnd Gnd Gnd 6 12V 0V 11 8V 8 Gnd Gnd Gnd 10 5V 5 15V 5 15V 12 5V 5 15V 5 15V 14 Gnd Gnd Gnd 16 Gnd Gnd Gnd 18 ACD 4V 4 57V 20 INV 0V 3 29V 22 PDIM 0V 3 38V 24 SYNC 0V 0V Odd Pins Even Pins IC109 IC108 IC110 1 16 Q901 Q902 IC400 IC802 IC810 ...

Page 77: ...PDP Training Fall 2008 79 Schematics 79 4 2 L G 6 0 LVDS CABLE P900 FROM MAIN PWB TO CONTROL PWB P101 USING SMTP COLOR BAR INPUT LAST TWO WAVEFORMS ARE FROM THE TUNER Measurements 5 42LG60 Waveforms ...

Page 78: ...PDP Training Fall 2008 80 Schematics 80 4 2 L G 6 0 42LG60 Main Board BCM ...

Page 79: ...PDP Training Fall 2008 81 Schematics 81 4 2 L G 6 0 42LG60 Main Board DDR Memory ...

Page 80: ...PDP Training Fall 2008 82 Schematics 82 4 2 L G 6 0 42LG60 Main Board Main Microprocessor ...

Page 81: ...PDP Training Fall 2008 83 Schematics 83 4 2 L G 6 0 42LG60 Main Board Audio Processor ...

Page 82: ...PDP Training Fall 2008 84 Schematics 84 4 2 L G 6 0 42LG60 Main Board HDMI ...

Page 83: ...PDP Training Fall 2008 85 Schematics 85 4 2 L G 6 0 42LG60 Main Board Interface ...

Page 84: ...PDP Training Fall 2008 86 Schematics 86 4 2 L G 6 0 42LG60 Main Board Interface ...

Page 85: ...PDP Training Fall 2008 87 Schematics 87 4 2 L G 6 0 42LG60 Main Board REgulators ...

Page 86: ...PDP Training Fall 2008 88 Schematics 88 4 2 L G 6 0 42LG60 Main Board LVDS Tuner ...

Page 87: ...PDP Training Fall 2008 89 Schematics 89 4 2 L G 6 0 42LG60 Main Board Audio Out ...

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