Haier HL22KN1 Service Manual page 43

Display trouble（white screen）
White screen
Check the power supply
for panel
N Y
Check the switch signal for
Check the output signal
Q24/AO3401(changed
Of U5
from 5~0V)
Y N
N
Y
Change the LCD panel or
Check the circuit from U6/NT68F631 to Q24
Check U5
Check CN8 or change Q24
The cable to panel
or U6 had been damaged