LG 50PB4RTH-TB (CHASSIS:PP7BA) Service Manual ▷ View online
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2. Protect mode
(1) Symptom
1) After lighting once it does not discharge minutely from the module.
2) The relay falls.(there is an audible “Click”.)
3) The color of the front LED turns from green to red.
2) The relay falls.(there is an audible “Click”.)
3) The color of the front LED turns from green to red.
(2) Follow check
Is the PSU normal ?
Replace Power Board.
Is the output the normal Low/High
voltage except for the Stand-by 5V?
voltage except for the Stand-by 5V?
Yes
No
No
Are all the connectors
normal?
Replace the connector.
Replace the fuse.
Replace the Y-Board.
After checking each connector does
is operate correctly?
is operate correctly?
Yes
No
No
Is the Y-Board
normal?
Is the appropriate
fuse (FS2,FS3) on the
Y-B/D?
Is the output voltage
normal after removing
the P1 connector of
the Y-B/D?
normal after removing
the P1 connector of
the Y-B/D?
Yes
No
No
Replace the Z-Board.
Is the Z-Board
normal?
Is appropriate
fuse (FS1,FS2) on
the Z-B/D?
Is the output voltage
normal after removing
the P1 connector of
the Z-B/D?
Yes
No
No
Is the X- Board
normal?
Is the
output voltage normal
after removing the P100, 110,
200, 210 connector of
the X-B/D?
After removing the P100, 110 and the output
voltage is normal : Replace the Right X-B/D
After removing the P200, 210 and the output
voltage is normal : Replace the Left X-B/D
voltage is normal : Replace the Right X-B/D
After removing the P200, 210 and the output
voltage is normal : Replace the Left X-B/D
No
Yes
Replace the fuse.
Yes
Start Check
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3. No Raster
(1) Symptom
1) No OSD or image are displayed on the screen.
2) It maintains the condition where the front LED is green.
2) It maintains the condition where the front LED is green.
(2) Follow check
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
IC700 normal?
Reconnect the link cable in P600.
No
Replace the VSC.
No
Yes
Start Check
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4. In the case an unusual display in RF mode(Main).
Check the power.(L1004)
Is the
video output of the
CXA2069Q normal? (Check R324,
in case of S-Video
Check R324,
R328)
Is the
input voltage
normal?(Check
L308)
Yes
No
Yes
Is the LVDS
Cable connected?
Yes
Change the IC(IC700)
Re-insert the cable.
No
Check the IC.(IC300)
No
A
Check the power.
Is the
video output of the
Tuner normal? (Check
TU200_Pin14)
Is the
input voltage
normal?(Check Pin8,
Pin6)
Is the I2C communication
normal?
(Check Pin5, Pin4)
normal?
(Check Pin5, Pin4)
Yes
No
Yes
No
Check the Tuner.
No
Re-insert the cable.
Is the
Tuner Cable
connected?
No
No
Is the
I2C communication
normal? (Check
R309, R310)
No
5. In the case of an unusual display in rear AV mode(Main).
Is video input of
the A/V jack normal?
Yes
Sam as Block A
Check the input source.
No
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6. In the case of an unusual display in rear S-Video mode(Main).
Is the video input
of the A/V jack normal?
Yes
Sam as Block A
Check the input source.
No
7. In the case of an unusual display in Side AV mode(Main).
Is the video input
of the A/V jack normal?
Yes
Sam as Block A
Check the input source.
No
8. In the case of an unusual display in Side S-Video mode(main).
Is the video
input of the A/V jack
normal? (Check R339,
R341,L310)
Yes
Sam as Block A
Check the input source.
No
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