Philips 26MD257B/37 Service Manual page 118

16
TPM1.0U LA
5. Service Modes, Error Codes and Fault Finding
4.No TV sound
Check if
tuner TU201 pin11
output IF signal
Yes
Check U301
5.No earthphone sound
Check
U760 pin15=3.3V
Yes
Check U760
pin20=HPOUTL
pin6=HPOUTR
Yes
Replace Side AV Board
No
Replace TU201
Eliminate short and open
No
situation
No
Replace U760