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
YES
YES
NO
No backlight
Measure the
Voltage of
VLED during
power on
OVP?
Jump to OVP
and drop VBL
quickly
Always VBL
not change
OVP when
disconnect
backlight
Short LB
Check boost
unit, IC/
MOSFET/Diode
Replace main
board
Replace
backlight
module/LB
Open LB trace
Check
connection/replace
backlight
module/LB
End
39
