Stihl BT 131 - Display Trouble (Black Screen)

VIDEOCON INDUSTRIES LTD. V59-CTYPE
The information in the specification is subject to change without notice
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3) Display Trouble (black screen)
Check if VDD(17V) of N702 ？
CheckD714 D715 N702 N704
& peripheral circuit?
OK
Check LED+ VCC
Check ADJ-PWM VCC is low
NG
OK
NG
NG
Check Q708 & BL-ON/OFF peripheral
Circuit
Repair the circuit
Check
The Panel .
OK