Philips 20PFL4122/93 Service Manual page 13

5.3 Repair flow chart
1.No work/LED is off
power switch is
IR board CN001
pin1=0V,pin2=3.7V,
pin3=3V,pin4=2.85V
,pin5=5V,pin6
Check scaler board U102
pin1=14V,pin4=1.22V,
pin7=16V,pin8=5V,
2.No raster/picture too
dim
Inverter board
CN852,pin1=16V,
pin5=0.9V,pin6
Inverter board
U811 pin2=5V,Q821
pin=5,6=16V
Check scaler board
5. Service Modes, Error Codes and Fault Finding
Check if
No
normal
Yes
Check
No
=3.3V
Yes
Check
No
=3V
Yes
Check
No
Yes
Replace Power switch
Check IR board
Check Scaler board
Check U811,Q821
13
TPS 1.0A LA