LG 50PB4RT-MA (CHASSIS:PP78B) Service Manual ▷ View online
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GUIA DE RESOLUÇÃO DE PROBLEMAS
1. No power
W
Symptom
1) Minute discharge doesn’ t occur at module.
2) Front LED doesn’t come into action.
Start check
Is inserted a plug
in power cord?
Is connected the Line
Filter and PSU?
Is normal the fuse
of PSU? Plasma(F101),
LCD(F111)
Plug in a power cord
Connect a cable.
Plasma (EL11), LCD(SC100)
Replace the fuse
Is it connected
that PSU and 13pin cable
in VSC board?
Connect the 13pin cable.
YES
YES
YES
YES
NO
NO
NO
NO
After remove all cables connected to
PSU(except the CN101), authorizes the AC
voltage marking on manual.
When ST-by 5V doesn’ t operate, replace PSU
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1) After once shining, it doesn’ t discharge minutely from module.
2) The relay falls.(The sound is audible "Click")
3) It is converted with the color where the front LED is red from
green
.
2. Protection mode
Start check
Is the PSU
normal?
Is the each
connector normal?
Is the Y- Board
normal?
Is output the normality Low/High
Voltage except Stand-by 5V?
Replace the power board
After connecting well each
connector the normality it operates?
Replace the power board
Is normal the output voltage after
remove P1connector of Y-B/D?
Replace Y-B/D
Is normal the fuse
(FS2,FS3) on Y-B/D?
Replace the fuse
Is the Z- Board
normal?
Is normal the output voltage after
remove P1 connector of Z-B/D?
Replace Z-B/D
Is normal the fuse
(FS1,FS2) on Z-B/D?
Replace the fuse
Is the X- Board
normal?
After remove P100,110 output voltage normality:
Replace Right X-B/D
After remove P200,210 output voltage normality:
Replace Left X-B/D
Is normal the output voltage
after remove P100,110,200, 210
connector of X-B/D?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
W
Symptom
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3. No Raster
1) No OSD and image occur at screen.
2) It maintains the condition where the front LED is green
Start check
Is the link cable
normal?
Reconnect the link cable
in P600
NO
Is the
IC700
s
output normal?
NO
Replace the VSC
Does minute
discharge at
discharge at
Module?
NO
Is the
inverter/ VaVs
on?
Check the PDP/LCD Module
Is output the normality Low/High
Voltage except Stand-by 5V?
Replace
the power board
YES
YES
YES
NO
W
Symptom
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4. In case of becomes unusual display from RF mode(Main)
A
Is normal video
output of the Tuner?
(Check TU200_Pin14)
Is normal the I2C
communication ?
(Check Pin5, Pin4)
Is normal the
Input voltage?
(Check L308)
Is normal the
Input voltage ?
(Check Pin8, Pin6)
Is normal video
output of CXA2069Q?
(Check R324, In case of S-Video
check R324, R328)
Is the Tuner Cable
connected well?
Change the Tuner
Check the power
Cable inserts well.
Is normal the I2C
communication ?
(Check R309, R310)
Change the IC(IC300)
Check the power
( Check L1004)
Change the IC (IC700)
Is the LVDS Cable
connected well?
Cable inserts well
NO
NO
NO
YES
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
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