Haier LE32F2220a - Main Board Failure Diagnostics

Change Panel
Still having problems
No picture but h ave sound
Check if there is +12V at Pin35 in CN204
No
Replace the Q101
Yes
Yes
No
Check if U3 and U4 Pin20 ˄3.3V˅ǃPin11˄5V˅ǃ Pin19˄5V˅;U5 ˖
Pin2(0.72V)ǃPin3 ˄5V˅ǃPin4(12V)ǃ
Pin6(5.7V) is normal
Change LVDS wire
No
Replace U3 or U5 U4
Check if Q103 ǃ
ǃ D10ǃ D9 ǃ
is working
Yes
Replace Q103ǃ
ǃD10ǃ
D9
No
Service Manual
Model No.:
9-2. Main board failure check
- 39 -
Check if there is
at C931
+30V