DOWNLOAD LG 42LC42 (CHASSIS:LP78A) Service Manual ↓ Size: 5.24 MB | Pages: 41 in PDF or view online for FREE

Model
42LC42 (CHASSIS:LP78A)
Pages
41
Size
5.24 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lc42-chassis-lp78a.pdf
Date
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LG 42LC42 (CHASSIS:LP78A) Service Manual ▷ View online

- 21 -
5. In case of becomes unusual display from rear AV mode.
Is video input of
the A/V jack normal?
(Check R172)
Yes
Sam as Block A
Check the input source.
No
6. In case of becomes unusual display from Side AV mode.
Is video input 
of the A/V jack normal?
(Check CN703
Pin9)
Yes
Sam as Block A
Check the input source.
No
CN703
Pin 11
CN703
Pin 1,3
7. In case of becomes unusual display from Side S-Video mode.
Is video input 
of the A/V jack normal?
(Check CN703
Pin9)
Yes
Sam as Block A
Check the input source.
No
- 22 -
8. In case of becomes unusual display from SCART 1 mode.
Is video input
of the A/V jack normal?
(Check R172)
Yes
Sam as Block A
Check the input source.
No
9. In case of becomes unusual display from SCART 1_RGB mode.
Is
video input of
the A/V jack normal?(Check
R110,R170, R171,
R173)
Yes
Sam as Block A
Check the input source.
No
10. In case of becomes unusual display from SCART 2 mode.
Is video input of
the A/V jack normal?
(Check R174)
Yes
Sam as Block A
Check the input source.
No
- 23 -
11. In case of becomes unusual display from component 1 mode.
Is video
input of the A/V jack
normal? (Check R248,
R249,R250)
Yes
Change IC(IC500)
Check the input source.
No
12. In case of becomes unusual display from component 2 mode.
Yes
Change IC(IC500)
Check the input source.
No
Is video
input of the A/V jack
normal? (Check R241,
R242, R243)
13. In case of becomes unusual display from RGB mode.
Yes
Change IC(IC500)
Check the input source.
No
Is
R, G, B input
and H, V sync of the
JK201 normal?(Check R220,
R221, R253, R254,
R255)
- 24 -
14. No Sound
(1) Symptom
1) LED is green.
2) Screen display but sound is not output.
(2) Check following
All input(mode) 
is no sound.
Is the speaker 
on it men?
Yes
Yes
Menu?
Normal
Is the speaker
cable normal?
Yes
Yes
Only HDMI is
no sound.
Yes
Only AV
/COM2/PC input is
no sound.
Is the output
of IC600(R607, R608)
normal?
Yes
Only RF is no sound.
No
No
No
No
Download the EDID data.
Set on speaker
in menu.
No
Replace IC600
No
Check the Speaker
cable
No
IC500 operae
nor mall?
Replace IC500
No
Yes
IC601 operae
nor mall?
Replace IC601
Replace VSC BD
Yes
Check the signal after
IC600 refer to circuit
diagrma.
Check the Tuner In/Out.
No
Normal
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