Dell E176FPc Service Manual page 43

Panel Power Circuit
Check C101 should have response from
0V to 5V when we switch the power
switch from off to on
Check CN101, if it is not soldered well
Change panel
Inverter Control Relative Circuit
Measured the inverter connector CN402
Pin2 on/off control=3.3V (on)
Pin4 PWM signal control dim 0V-5V
Replace Inverter board to new-one
And check the screen is normal?
OK
OK
OK
NG, still no screen
Check the PPWR panel power relative circuit,
Q704, Q706; in normal operation, When LED
NG
=green, V-R725 should =5V,If PPWR
no-response when the power switch turn on and
turn off,
NG
Check the BKlt-On relative circuit, R705; in
NG
normal operation, when LED=green, R705
BKlt-On should=3.3V, If BKlt-On no-response
when the power switch turn on-off, Replace
U401
NG
Check NO SCREEN APPEAR block
43
Dell E176FPc
Change CN101