XOCECO LC-37R25, Service Manual

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3. Troubleshooting guide
1. Without backlight
In STANDBY, does
LED red light
Check the pin1 and pin3 of
CN3 has +5V output
Check the
FUSE
Replace supply
power board
Check the LED
Replace CPU board
Does LED flicker
Replace CPU
board
Check the
backlight socket is
normal?
Problem LCD screen
Check if the X508
(pin1-2) of the power
board has 18V,
pin10-12 has 120V.
Is 5v for pin10 of
X20 ?
Check if between R172
and R173 connect wire
has 3.3V, if R178 short
to the guand?
Replace CPU board
Check the pin B and pin
C of V10 and V12 is
normal?
Yes
No
No
Yes
Yes
No
Yes
Yes
No
No
No
Yes
Green
Yes
No change color