Haier HLH19BB Service Manual page 19

2.Display Trouble
2.1 Black
N
Tunn on or not
N
Turn on
Black Screen
Check 5V for BLON on CN10
Y
N
Check the cirture for
Q4/MMBT3904
12V inverter input ?
N
Check the power supply
Y
Y
Check the inverter
or self-proofed
2