DOWNLOAD LG 37LG7000 (CHASSIS:LD88F) Service Manual ↓ Size: 3.83 MB | Pages: 37 in PDF or view online for FREE

Model
37LG7000 (CHASSIS:LD88F)
Pages
37
Size
3.83 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
37lg7000-chassis-ld88f.pdf
Date
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LG 37LG7000 (CHASSIS:LD88F) Service Manual ▷ View online

- 17 -
Check Tuner
1. VDD Check -> TU300 pin22:1.8V
pin21: 3.3V
pin4:5V
2. IIC check -> pin10,11
Check ATV signal
1. Video signal
-> TU Main Signal : R336
-> Tuner V-out:C318
Replace TU300.
Check Front END IC100
1. Check C518 
Check DTV signal
1. TP signal -> Pin 24~34
2. IIC check -> pin 18,19
Replace TU300.
NG : DTV
Check ATV sound signal
1. Sound signal 
-> SIF : R317
-> SECAM-L sound:R326
NG : DTV
Check sound processor
1. IC603 pin50 for SIF(RF sound)
2. IC603 pin47 for SECAM-L sound
Check App S/W.
If App S/W OK then replace IC603.
Check Digital AMP
1. VDD 16V:IC600 pin49~52, 32~35
VDD 1.8V:IC600 pin2, 13, 16
2. Mute check:IC600 pin25
No problem
NG
No 
problem
No problem
No problem
Check App S/W
If App S/W OK then replace IC600.
NG
NG : DTV
NG
NG
Replace Main B/D.
NG
Check App S/W.
If App S/W OK then
replace IC100.
2-2. In case of abnormal display or sound when RF mode
Replace TU300.
NG
NG
Check App S/W.
If App S/W OK then replace Main B/D.
- 18 -
Check video signal
1. Red : JK100 pin15 and C508
2. Green : JK100 pin11 and C511
3. Blue : JK100 pin7 and C514
4. CVBS : JK100 pin20 and C1909
Check AV1 Jack
1. SCART1 LINK check
->R148 or JK100 pin17
Check Video, Audio
Check Audio signal
1. R : JK100 pin2 and C679
2. L : JK100 pin6 and C692
Audio NG
Check App S/W.
If App S/W OK then replace IC603.
No problem
Check the input source of Equipment.
NG
Check App S/W.
If App S/W OK then replace IC600.
Check App S/W.
If App S/W OK then replace Main B/D.
NG
Check Digital AMP
1. VDD 16V : IC600 pin49~52, 32~35
VDD 1.8V : IC600 pin12,13,16
2. Mute check : IC600 pin25
No problem
Video NG
Replace IC100.
No problem
No problem
2-3. In case of abnormal display or sound when side AV1(SCART1) mode
Check video signal
1. CVBS : JK101 pin20 and C519
Check AV2 Jack
1. SCART1 LINK check
->R149 or JK101 pin17
Check Video, Audio
Check Audio signal
1. R : JK101 pin2 and C690
2. L : JK101 pin6 and C627
Audio NG
Check App S/W.
If App S/W OK then replace IC603.
No problem
Check the input source of Equipment.
NG
Check App S/W.
If App S/W OK then replace IC600.
Check App S/W.
If App S/W OK then replace Main B/D.
NG
Check Digital AMP
1. VDD 16V : IC600 pin49~52, 32~35
VDD 1.8V : IC600 pin12,13,16
2. Mute check : IC600 pin25
No problem
Video NG
Check App S/W.
If App S/W OK then
Replace IC100.
No problem
No problem
2-4. In case of abnormal display or sound when side AV2(SCART2) mode
- 19 -
Check EDID EEPROM
1. IC102 VDD Check
-> pin8 : 5V
2. DDC IIC line check
-> IC102 pin 6, 5
Check RGB Jack
1. RGB LINK check
->R189 or P101 pin10
Check Video, Audio
Check sink signal
1. H-sync : P101 pin13
2. V-sync : P101 pin14
No problem : case 1
No problem:  case 2
Check App S/W
If App S/W OK then replace IC102.
NG
NG
Check App S/W.
If App S/W OK then replace IC100.
Check Video & sink signal
1. Red : P101 pin1 and C501
2. Green : P101 pin2 and C502
3. Blue : P101 pin3 and C503
NG
Check App S/W.
If App S/W OK then replace IC100.
NG
Check 74HC14D IC103
1. H-sync : pin4
2. V-sync : pin8
3. If problem with IC103 then replace IC103
No problem
or No sound
Check EDID
1. Read EDID data
EDID download
and recheck
No problem
No problem
2-5. In case of abnormal display or sound when VGA Input mode
Check video signal
1. Y : JK102 pin3A and C509
2. Pb : JK102 pin5B and C512
3. Pr : JK102 pin5C and C515
Check Component Jack.
1. COMP LINK check
->R167 or JK102 pinA4
Check Video, Audio
Check Audio signal
1. R : JK102 pin3E and C614
2. L : JK102 pin5D and C613
Audio NG
Check App S/W.
If App S/W OK then replace IC100.
No problem
Check the input source of Equipment.
NG
NG
Video NG
Check App S/W.
If App S/W OK then
Replace IC100.
No problem
2-6. In case of abnormal display or sound when Component Input mode
- 20 -
Check video signal
1. CVBS : JK103 pin2 and C517
Check AV3 Jack.
1. AV3 LINK check
->R187 or JK103 pin3
Check Video, Audio
Check Audio signal
1. R : JK103 pin7 and C616
2. L : JK102 pin8 and C615
Audio NG
Check App S/W.
If App S/W OK then replace IC100.
No problem
Check the input source of Equipment.
NG
NG
Video NG
Check App S/W.
If App S/W OK then
replace IC100.
No problem
2-7. In case of abnormal display or sound when side AV3 mode
Check EDID.
1. Read EDID data.
Check EDID EEPROM
1. IC201~4 VDD Check
-> pin8:5V
2. DDC IIC lin check
-> IC201~4 pin6,5
Check HDMI HPD Output
1. HDMI JK201, 202, 203 Pin19
Check TMDS signal.
1. JK201~3, JK204 pin1~12
Check App S/W.
If App S/W OK then replace IC100.
No problem
Check App S/W.
If App S/W OK then replace IC201~4.
NG
Check HDMI 5V_DET input
1. HDMI JK201, 202, 203 Pin20
Check HDMI source.
If OK then replace HDMI JACK.
No problem
Check App S/W.
If App S/W OK then replace IC100.
No problem
No problem
or No sound
Check TMDS 351 IC(IC200).
1. VDD check -> pin6,12,19,25,40,46,55,61:3.3V
2. HDMI SEL check -> pin33,32
No problem : case HDMI1~3
Check TMDS351 TMDS signal check.
1. Pin17~27
No problem
Check App S/W.
If App S/W OK then replace IC100.
No problem
NG
No problem
case HDMI4
Video NG
Check App S/W.
If App S/W OK then replace IC200.
NG
EDID download
and re-check
All data:FF
2-8. In case of abnormal display or sound when HDMI1,2,3,4 mode
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