LG 50PC52-ZD (CHASSIS:PP78A) Service Manual ▷ View online
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3. No Raster
(1) Symptom
1) No OSD or image are displayed on the screen.
2) The front LED remains green.
2) The front LED remains green.
(2) Follow check
4. In the case an unusual display in RF mode.
Check the PDP Module
Replace the
Power board.
Power board.
Does
minute discharge
at Module?
Is the inverter
/VaVs on?
Is output the normal
Low/High voltage except
for the Stand-by 5V?
Low/High voltage except
for the Stand-by 5V?
Yes
No
No
Is there a fault with
the link cable?
Yes
Is the output for the
IC500 normal?
Reconnect the link cable in
P803(Plasma).
P803(Plasma).
No
Replace the VSC.
No
Yes
Check the power.(L1103)
Is the
video output of the
Tuner normal? (Check
TU400_Pin13)
Is the
input voltage
normal?(Check
Pin3)
Is the I2C communication normal?
(Check Pin9, Pin10)
(Check Pin9, Pin10)
Yes
No
Yes
Is the LVDS
Cable connected?
Yes
Change the IC(IC500)
Re-insert the cable.
No
No
Check the Tuner.
No
A
Start Check
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5. In the case of an unusual display in 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 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
7. 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
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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.
No
Is 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
JK201 normal?(Check R220,
R221, R253, R254,
R255)
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