Haier MT5311 Manual page 82

5. 5. Display Trouble (Black screen)
Black screen
Check if voltage on pin3 of CN5(BLON Signal) is high level g p ( g ) g
Y N
Is inverter power is normal?
N Y
Check the circuit of BLON
Check the voltage on pin No.1,2 of CN5
Change inverter from QL2 to UM1 (pin
N E25) No.E25)
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