Panasonic TH-43DX400L, Руководство по обслуживанию

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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
OVP?
NO
Always VBL
not change
OVP when
disconnect
backlight
YES
Short LB
YES NO
Jump to OVP
and drop VBL
quickly
Open LB trace
Check
connection/replace
backlight
module/LB
Check boost
unit, IC/
MOSFET/Diode
Replace main
board
Replace
backlight
module/LB
End