Philips 15MF227B/27 Service Manual page 17

5. Service Modes, Error Codes and Fault Finding
3.No picture/LED is green
Check
scaler board U102
pin1=14V,pin4=1.22V,
pin7=16V,pin8
=5V
Yes
Check if
working voltage
U152,pin2=3.3V
pin3=5V
Yes
Check if clock
source X350
Yes
Check if
RGB,clk,H/V and
DE signal output 128
bits TTL
Yes
Check
resistors-network
Yes
Replace LVDS cable
4.No TV sound
Check if
tuner TU201 pin11
output IF signal
Yes
Check U301
No
Check power
Check circuit around
No
each regulator and
eliminate short and
open situation
No
Replace X350
Try to replace
No
flash Rom
EEPROM
No
Replace bad resistors-
network
No
Replace TU201
TPM1.0U LA 17