Haier 48E2500 - Display Troubleshooting: Screen States; White Screen Issue Diagnosis; Black Screen Issue Diagnosis

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Service Manual
Model No.: 48E2500
7ǃDisplay Trouble ˄white screen˅
White screen
Check if the voltage of panel power
supply is normal(depend on panel)
N
Y
Check the circuit of QM1
Check output signal
from U1(MSD3393)
Change the panel
or the cable to panel
Change U1(MSD3393)
Y
N
8ǃDisplay Trouble˄black screen˅
Black screen
Check if BL_ON state is normal
Check if the control circuit
between BL_ON and
BL_EN is normal ?
N
N
Y
Y
Repair the power supply
Check if the power supply
for inverter is normal?
Check the inverter board
Check if the control circuit
between ADJ and
PWM/ADJ is normal ?
N
Y
Repair the circuit
Change U1(MSD3393)