Read LG 50PB4RT-MA (CHASSIS:PP78B) Service Manual online
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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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