Haier 40D3505 - Mainboard Failure Check

Service Manual
Model No.: 40D3505
9-3. Mainboard Failure Check
No picture but have sound
Check the power output
No
Change the Power Board
Yes
Check the CN2 (BLO)
Backlight on/off
Yes
No
There’s something wrong
with FRC
Verify if the DC/DC
convertor can output the
right Voltage,
No
Change the corresponding
DC/DC
QB3 output 5V
Yes
No
Verify if QM1
output
Change the QM1
Yes
Still having
problems
Change Panel
Change LVDS wire
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