XOCECO LC-52R36, Service Manual

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2
3
2
. Troubleshooting guide
Make sure that the IR board, key board and their connection wires are good then judge below:
2.
1 Without backlight
In STANDBY, does
LED red light
Check if the pin3 of X505 has
+5V output
Is the FUSE
melted?
Check power
board
Press POWER button
to turn on the unit,
then check the LED
Replace CPU board
Press any key on the RC,
Does LED flicker?
Replace CPU board
Check if L43, L44 have
+3.3V?
LCD screen has problem
Check if the X506
(pin6-7) of the power
board has 18V, pin1-5
has 18V.
Is it 18V for pin1-5 of
X16 of CPU ?
Check if FU1 of CPU
board is melted?
If N21 pin4 is 18V?
Replace the fuse.
Yes
No
No
Yes
Yes
No
No
Yes
No
No
No
Yes
Blue
Yes
No change color
Yes
Replace N21
No
Replace CPU.
Yes
Check if the back light
socket is well insert?
Yes
Check if base of V15
is 3.3V Replace N22
Low High
No