Main Board Failure Check - Haier LE48U5000TF Service Manual

9-2. Main bo ard failure c hec k
No picture but have sound
Check if the backlight of
panel is working
Yes
Check if there is +12V at
Pin1~Pin8 in CN22
Change VB1 wire
No
No
Yes
Replace the
QD8 QD9
Still having
problems
check if J16 Pin3(3.3V)
Pin2(>0.7V) is normal
Yes
Change the Power
board
Change Panel
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Service Manual
Model No.:
Change the
No
Mainboard