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LGE Internal Use Only

- 23 -

13. No Sound

(1) Symptom

1) LED is green.
2) There is a picture but no sound.

(2) Follow check

Is there

sound in any

mode?

Is the speaker on?

Yes

Is the speaker
cable normal?

Yes

Is there

no sound only for

HDMI?

Yes

Is there no

sound only AV

/COM2/PC?

Is the

output of IC600

(R607, R608)

normal?

Yes

Is there

no sound only for

RF?

Download the EDID data.

Set speaker on
in the menu.

Replace the

IC600.

Check the Speaker
cable.

Is the IC500

operating normal?

Replace the IC500.

Yes

Is the IC601

operating normal?

Replace the IC601.

Replace the VSC BD.

Yes

Check the signal after IC600.
Refer to circuit diagram.

Check the Tuner In/Out.

Содержание 32LC4R*

Страница 1: ...R LCD TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LP78B MODEL 32LC4R 32LC4R MD website http biz LGservice com Internal Use Only ...

Страница 2: ...c All right reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 18 BLOCK DIAGRAM 25 EXPLODED VIEW 26 EXPLODED VIEW PARTS LIST 27 REPLACEMENT PARTS LIST 28 SVC SHEET ...

Страница 3: ...fe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna term...

Страница 4: ... on your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge...

Страница 5: ...the solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replac...

Страница 6: ... sound distortion point H x V x D with inverter H x W H x V x D with inverter H x V H x V x D with inverter H x V LC260WX2 SLB3 LPL 26 Specification 26 27 32 37 42 wide Color Display Module 16 9 26 27 32 37 42 TFT WXGA LCD Temp 0 40 deg Humidity 0 85 Temp 20 60 deg Humidity 0 85 100 240V 50 60Hz Power on Green TBD 42 max 26 27 32 37 St By Red 1 0 W AUO Outline Dimension 26 32 37 Pixel Pitch 26 32 ...

Страница 7: ...00 59 94 60 00 50 00 Proposed SDTV DVD 480I 525I SDTV DVD 480I 525I SDTV DVD 576I 625I 50Hz SDTV 480P SDTV 480P SDTV 576P 50Hz HDTV 720P HDTV 720P HDTV 720P 50Hz HDTV 1080I HDTV 1080I HDTV 1080I 50Hz H freq kHz 15 73 15 75 15 625 31 47 31 50 31 25 44 96 45 00 37 50 33 72 33 75 28 125 Resolution 720 480 720 480 720 576 720 480 720 480 720 576 1280 720 1280 720 1280 720 1920 1080 1920 1080 1920 1080...

Страница 8: ...DTV 720P HDTV 720P HDTV 720P 50Hz HDTV 1080I HDTV 1080I HDTV 1080I 50Hz HDTV 1080P HDTV 1080P HDTV 1080P 50Hz Remark support not spec support not spec support not spec H freq kHz 15 75 15 73 15 625 31 47 31 50 31 25 44 96 45 00 37 50 33 72 33 75 28 125 67 432 67 5 56 250 Resolution 720 480 720 480 720 576 720 480 720 480 720 576 1280 720 1280 720 1280 720 1920 1080 1920 1080 1920 1080 1920 1080 19...

Страница 9: ...nt execute Heat Run for 30 minutes at RF no signal 3 Adjustment items 3 1 PCB assembly adjustment items 1 Download the VCTP main software IC500 VCT_Pro 2 Channel memory IC501 EEPROM 3 Color carrier Adjustment 3 2 SET assembly adjustment items 1 DDC Data input 2 Adjustment of White Balance 3 Factoring Option Data input 4 PCB assembly adjustment method Using VCTP Download program 4 1 Download progra...

Страница 10: ... 2 S W program download 1 Download method 1 PCB Ass y 1 Connect the download jig to D sub jack 2 Execute Download vi2c program in PC then a main window will be opened 3 Double click the blue box and confirm Bootloader Version as 42 4 Click the Erase Flash button 5 Double click the download file low then edit window will be opened 6 Click the choice button in the edit window then file choice window...

Страница 11: ...ct SCL to GND using switch at Jig and connect the download jig to D sub jack 2 Supply the power Stand by 5V and wait for 3 seconds 3 Push the S W off Disconnect SCL to GND using switch at jig 4 Execute Download vi2c program in PC then a main widow will be opened 5 Double click the blue box and confirm Bootloader Version as 42 6 Click the Erase Flash button 7 Double click the download file low then...

Страница 12: ...owledge from slave execute download again from 1 3 Download method 3 SET 1 Push the Tilt button in an Adjust Remote control Then the LCD TV will change a slave mode 2 Connect Zig to TV using a D sub cable 3 Execute Download_CS vi2c program in PC then a main widow will be opened 4 Click GO button If you don t push the go the Hex file would not be downloaded although the download proceeds normally a...

Страница 13: ... downloading with click open button 10 Click OK button at the edit window 11 Downloading 12 If download is failed for example No acknowledge from slave execute download again from 1 4 3 Channel memory download 1 Connect the download jig to D sub jack 2 Execute Channel vi2c program in PC then a main window will be opened 3 Push the button change and select the Channel memory data 4 Check the commun...

Страница 14: ... 61 40 01 01 01 01 1B 21 50 A0 51 00 1E 30 48 88 0040 35 00 BC 88 21 00 00 1C 4E 1F 00 80 51 00 1E 30 0050 40 80 37 00 BC 88 21 00 00 18 0060 00 00 00 FD 0070 00 3A 3F 1F 32 09 00 0A 20 20 20 20 20 20 01 0080 02 03 25 F1 52 01 06 07 15 16 02 03 11 12 13 04 0090 14 85 20 21 22 1F 10 23 09 07 07 83 01 00 00 65 00A0 03 0C 00 10 00 01 1D 00 80 51 D0 1C 20 40 80 35 00B0 00 BC 88 21 00 00 1E 8C 0A D0 8A...

Страница 15: ... RGB LP78B_RGB ANA Digital HDMI1 LP78B_HDMI1 DVI Digital HDMI2 LP78B_HDMI2 DVI 3 Set the S W as below 4 Push the Write Data Verify button And confirm Yes 5 If the writing is finished you will see the OK message 6 Adjustment of White Balance 6 1 Purpose and Principle 1 Purpose Adjust the color temperature to reduce the deviation of the module color temperature 2 Principle To adjust the white balanc...

Страница 16: ... of the CA 110 or CA 210 then stick sensor to the module when adjusting 1 Select white pattern of heat run by pressing POWER ON key on remote control for adjustment then operate heat run longer than 15 minutes If not executed this step the condition for W B will be differ 2 Changing to the av mode by remote control av mode av1 or av2 or av3 3 Display the internal pattern of the VCT Pro IC by pushi...

Страница 17: ... completed Exit adjustment mode using EXIT key on R C 6 6 Input the Shipping Option Data 1 Push the ADJ key in a Adjust Remote control 2 Input the Option Number that was specified in the BOM into the Shipping area 3 The work is finished Push A Key 7 Default Value in Adjustment mode Default values maybe modified the module condition 7 1 White Balance 8 Internal press test 9 Sound spec Copyright 200...

Страница 18: ...ess check Plug in the power cord No Yes Is the power cord plugged in Connect the cable SC100 No Yes Are the line filter and PSU connected Replace the fuse No Yes Is the correct fuse for the PSU in place F100 Connect the 13 14pin cable After all cables connect is removed to PSU the AC voltage marking is authorized on manual When ST by 5V is not operated replace the PSU No Yes Is the PSU and 13 14pi...

Страница 19: ...Does minute discharge at Module Is the inverter VaVs on Is output the normal Low High voltage except for the Stand by 5V Yes No No Is the link cable normal Yes Is the IC500 s output normal Reconnect the link cable in P804 No Replace the VSC No Yes Check the power Is the video output of the Tuner normal Check TU400_Pin13 Is the input voltage normal Check Pin3 Is the I2C communication normal Check P...

Страница 20: ...A V jack normal Check R172 Yes Sam as Block A Check the input source No 5 In the case of an unusual display in Side AV mode Is the video input of the A V jack normal Check CN703 Pin9 Yes Sam as Block A Check the input source No 6 In the case of an unusual display in Side S Video mode Is the video input of the A V jack normal Check CN703 Pin1 Pin3 Yes Sam as Block A Check the input source No ...

Страница 21: ...he A V jack normal Check R172 Yes Sam as Block A Check the input source No 8 In the case of an unusual display in SCART 1_RGB mode Is the video input of the A V jack normal Check R110 R170 R171 R173 Yes Sam as Block A Check the input source No 9 In the case of an unusual display in SCART 2 mode Is the video input of the A V jack normal Check R174 Yes Sam as Block A Check the input source No ...

Страница 22: ...ck R248 R249 R250 Yes Change the IC IC500 Check the input source No 11 In the case of an unusual display in component 2 mode Yes Change the IC IC500 Check the input source No Is the video input of the A V Jk202 normal Check R241 R242 R243 12 In the case of an unusual display in RGB mode Yes Change the IC IC500 Check the input source No Is the R G B input and H V sync of the JK201 normal Check R220...

Страница 23: ... normal Yes Yes Is there no sound only for HDMI Yes Is there no sound only AV COM2 PC Is the output of IC600 R607 R608 normal Yes Is there no sound only for RF No No No No Download the EDID data Set speaker on in the menu No Replace the IC600 No Check the Speaker cable No Is the IC500 operating normal Replace the IC500 No Yes Is the IC601 operating normal Replace the IC601 Replace the VSC BD Yes C...

Страница 24: ... Enable bit 5 HDCP decryption active Enable bit 4 HDCP authentication attempted Reset TMDS power down on register 0x60 offset 0x3f 0xff Check HDMI source Change to another source or cable Yes Is the wave continuous Normal video Normal audio No Yes Replace the IC303 No 1 Check TV input mode HDMI 1 port support HDMI and DVI So if you input DVI signal and PC audio from phone jack You can hear PC audi...

Страница 25: ...N LIN SCART1 2 _ID COMP1_Y Pb Pr COMP2_Y Pb Pr SCART1 2 MNT_OUT TV_OUT REAR_YC SIDE_YC PC_Aud io _L R REAR_R L SCART1 2_R L SIDE_R L REAR_V SIDE_V Sil9011 R_Aud io L_Aud io VGA_RGB A V S A V H Pho n e SIDE_R L TEA6420 So und sw itc h COMP1_R L 24C02 SCL SDA I 2 C L_SPK_OUT TDA2822M Amp R_Head R L_Head R L_Head 74ACT253 VGA_HS VS HDMI_HS VS AM_AUDIO 31P_LVDS Tx0 1 2 3 4 C DISP_EN TV_OUT MNT_OUT Var...

Страница 26: ...26 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 300 200 600 120 530 590 591 430 210 580 520 400 581 230 220 260 250 240 EXPLODED VIEW ...

Страница 27: ...A METAL JIG BOTTOM 300 ABJ32839404 Cabinet Assembly 32LC4R MD LP78A 32 CABINET ASSY H C 400 ACQ31747004 Cover Assembly Rear 32LC4R TA LP78A 32 BACK COVER ASSY 401 MGJ32425801 Plate PRESS EGI T1 6 METAL HGI 402 MCK32421902 Cover MOLD ABS 26LC4D AA FOR N AMERICA REAR AV BRACKET ABS FOR N AMERICA 403 MCK32525101 Cover MOLD HIPS 51SF 32LC4R HIPS 51SF COVER AV 430 AAN31752707 Base Assembly STAND 32LC4 ...

Страница 30: ...May 2007 Printed in Korea P NO MFL36696943 ...

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