Main Board Failure Check - Haier LE22T1F Service Manual

9-2. Main board failure check

No picture but h
ave sound
Check if there is
+30V at C931
Yes
Check if there is +5V at
Pin35 in CN204
Yes
Change LVDS wire
Chcek if U3 Pin20(3.3V)
Pin11(5V) Pin19(5v)
No
U5 Pin2(0.72V) Pin3(5V)
Pin6(5.7V) is normal
Pin4(12V)
No
Check if Q103 、
D10 D9
Replace the
Q101
Still having
problems
- 38 -
Service Manual
Model No.:
No
Replace U3 or
U5
Yes
No
is working
Change Panel
Replace
Q103、 D10
D9