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3.No back light
Power LED logic OK, sound OK, but no picture(Different from No Display). Power LED
logic OK, sound OK, but no picture(Different from No Display).
No backlight
Measure the
Voltage of
VLED during
power on
NO
OVP?
YES
Jump to OVP
and drop VBL
quickly
Open LB trace
connection/replace
25
OVP when
Always VBL
disconnect
not change
NO
Check boost
MOSFET/Diode
Replace main
Check
backlight
module/LB
YES
Short LB
backlight
Replace
unit, IC/
backlight
module/LB
board
End
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