Mainboard Failure Check - Haier LE40D3281 Service Manual

9-3. Mainboard Failure Check

No picture but have sound
Check the power output
Yes
Check the CN2 (BLO)
Backlight on/off
Verify if the DC/DC
convertor can output the
right Voltage,
QB3 output 5V
Verify if
QM1
output
Yes
Change LVDS wire
39
No
No
Yes
No
Yes
No
Service Manual
Model No.: LE40D3281
Change the Power Board
There's something wrong
with FRC
Change the corresponding
DC/DC
Change
the QM1
Still having
problems
Change Panel