Philips 300WN5QS/97, Service Manual

Page: 37 / 87

37 300WN5
Repair Flow Chart
Go to cover page
7.No SVHS /
CVBS picture
Check connector 1601
Pin 20 output Y-SVHS
Pin 21 output C-SVHS
Pin 12 output AV -CVBS
signals
No
Check input path from 1642
and 1641 to 1601
Yes
Go to connector 1
8.No HDTV picture
Check connector 1601
Pin 26 output G-Y
Pin 27 output B-Pb
Pin 25 output R-Pr
signals
No
Check input path from 1641
to 1601
Yes
Check ADC 7252
VDD=3V3
VD=3V3
PVD=3V3
No
Check circuit around each
regulator and eliminate short
and open situation
Yes
Check if ADC 7252
output 24 bits RGB
digital signal and
HDTV-HSYNV,
VSYNC, CLK
No
Replace 7252
Yes
Check resistors-
network
3271~3277 No
Replace 3271~3277
Yes
Go to connector 2
9.No PC / S-audio
/ CVI-audio sound
Check audio decoder 7901
Pin 35 input S-AUD-L
Pin 36 input S-AUD-R
Pin 38 input CVI-AUD-L
Pin 39 input CVI-AUD-R
Pin 41 input PC-AUD-L
Pin 42 input PC-AUD-R
No
Check input path from 1641
and 1601to 7901
Yes
Connector 3
Check if audio
decoder 7901
Pin 31=8V
Pin 10=5V
Pin 49=5V
Pin 63=5V
No
Eliminate short and open
situation
Yes
Check if 1901
output 18MHz
No
Replace 1901
Yes
Check if audio decoder 7901
Pin 20 output MSP-OUT-R
Pin 21 output MSP-OUT-L
signals
No
Replace 7901
Yes
Check if TDA1517 7941
Pin 1 input V(1517 in) L
Pin 2 input V(1517 in) R
signals
No
Check circuit around
7949, 7950, 7951
Yes
Check if 7947
Pin 7 =16V
No
Eliminate short and open
situation
Yes
Check if 7947
Pin 4 output signal
Pin 6 output signal No
Replace 7947
Yes
Replace speakers