LG 42LB2R (CHASSIS:LP62E) Service Manual ▷ View online
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TROUBLESHOOTING
1. No power
(1) Symptom
1) It is not discharged minutely from the module.
2) Light does not come in into the front LED.
2) Light does not come in into the front LED.
(2) Check following
Start check
Yes
No
Is a plug in power
cord inserted?
Plug in apower cord
Yes
No
Is the Line Filter and
PSU connected?
Connect a cable.
Plasma (EL11), LCD(SC100)
Plasma (EL11), LCD(SC100)
Yes
No
Is normal the fuse
of PSU? Plasma(F101),
LCD(F111)
Replace the fuse.
Yes
No
Is it that PSU and
13pin cable in VSC board
connected?
Conncet the 13pin cable.
After the cable connect isremoved to PSU (except
the CN101), the AC voltage marking is authorizesd
on manual.
When ST-by 5V doesn’t operate, replace PSU.
the CN101), the AC voltage marking is authorizesd
on manual.
When ST-by 5V doesn’t operate, replace PSU.
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2. Protection mode
(1) Symptom
1) Minute discharge doesn’t occur at module.
2) Front LED doesn’t come into action
2) Front LED doesn’t come into action
(2) Check following
Start check
Yes
No
Is the PSU normal?
Is output the normality Low/High
Voltage except Stand-by 5V?
Voltage except Stand-by 5V?
Replace the power board.
Replace the power board.
Is the output voltage normal after
remove P1 connector of Y-Boad?
remove P1 connector of Y-Boad?
Replace Y-Board.
Replace the fuse.
Yes
No
Is the each
connector normal?
Agter connecting well each connector,
the normality it operates?
the normality it operates?
Yes
No
No
Yes
Is the output voltage normal after
remove P1 connector of Z-Boad?
remove P1 connector of Z-Boad?
Replace Z-Board.
Replace the fuse.
No
Yes
Is the Y-Board normal?
Is the fuse (FS2,
FS3) on Y-Board
normal?
Is the fuse (FS1,
FS2) on Z-Board
normal?
Yes
No
Is the
output voltage normal
after remove P100, P110, 200,
210 connector of
X-Board?
No
Is the Z-Board normal?
Is the X-Board normal?
After remove P100, 110 output voltage
normality : Replace Right X-Board.
After rmove P200, 210 output voltage
normality : Replace Left X-Board.
normality : Replace Right X-Board.
After rmove P200, 210 output voltage
normality : Replace Left X-Board.
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3. No Raster
(1) Symptom
1) No OSD and image occur at screen.
2) It maintains the condition where the front LED is normal.
2) It maintains the condition where the front LED is normal.
(2) Check following
Is the output voltage normality Low/High
Voltage except Stan-by 5V?
Voltage except Stan-by 5V?
Replace the Power board.
Reconnect the link cable in
P803(Plasma)/P804(LCD).
P803(Plasma)/P804(LCD).
Check the PDP/LCD Module.
Yes
No
No
Yes
Replace the VSC.
Does minute discharge
at Module?
Is the inverter/VaVs
on?
Yes
No
No
Is the link cable
normal?
Is the IC800’s output
normal?
Start check
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4. In case of becomes unusual display from RF mode(Main)
Insert the cable well.
Yes
Yes
No
Check the power.
(Check L1004)
No
Change the IC(IC300).
No
check the power(L1103).
No
Change the Tuner.
No
Cable inserts well.
Change the IC(IC800).
Is video output
of the tuner(Check T201_
Pin14) normal?
Is the Tunner
Cable connected
well?
Is the Input
voltage(check pin5,
Pin4)
Yes
Yes
No
No
Is
video output
of CXA2069Q normal?
(Check R324, In case of
S-Video check
R324,R328)
Is the LVDS Cable
connected well?
Start check
Yes
No
Is normal the
12C communication?(Check
Pin5, Pin4)
Is the
input voltage normal?
(Check L308)
Yes
Is the 12C
communication? (Check
R309, R310)
5. In the case of becomes unusual display from rear AV mode(main)
Check the input source.
Same as Block A.
Yes
No
Is video input of
the A/V jack normal?
(Check R2101)
A
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