LG 32lc42 Service Manual

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8. In the case of an unusual display in SCART 1 mode.

Is the video input
of the A/V jack normal? (Check R172)
Yes
Sam as Block A
Check the input source.No
9. 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
10. 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
 

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11. In the case of an unusual display in component 1 mode.

Is the video
input of the A/V jack
normal? (Check R248, R249,R250)
Yes
Change the IC(IC500)
Check the input source.No
12. In the case of an unusual display in component 2 mode.

Yes
Change the IC(IC500)
Check the input source.NoIs the video
input of the A/V Jk202
normal? (Check R241, R242, R243)
13. 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...

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14. 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
Yes

Is the speaker
cable 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.
NoReplace the
IC600
No
Check the Speaker
cableNo

Is the IC500
operating normal? Replace...

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15. HDMI mode

Is only videonormal?

Is only audio normal? No
Yes
Download EDID data each port.
Check the TMDS line wave.
(R312~E3273)
1. Check the HDMI receiver’s status register. (0x60, offset 0x66)
- If the value is 0xf or 0x8, it is normal.
2. Check the HDCP register. (0x6, offset 0x32) - Enable bit 6 : HDCP key loaded
- 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....

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HDMI

BLOCK DIAGRAM
 

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530531
532590
591
120120300
200600
210220
202
580520
250
240
230
401
430
403
400
402

EXPLODED VIEW
 

Mar.,  2007
Printed in Korea
P/NO : MFL36696905