Philips 170M4FS/00, Руководство по обслуживанию

Страница: 81 / 83

81
170T4
Repair Flow Chart
Go to cover page
9.No SVHS /
CVBS picture
Check 7301
Pin 20 output Y-SVHS
Pin 21 output C-SVHS
Pin 18 output AV -CVBS
signals
No
Check input path from 1851
Yes
Go to 5. No TV Picture
10. No HDTV picture
Check connector 7252
Pin 48 output G-Y
Pin 43 output B-Pb
Pin 54 output R-Pr
signals
No
Check input path from 1201
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 5. No TV Picture
11.No PC / S-audio
/ CVI-audio sound
Check audio decoder 7901
Pin 41 input S-AUD-L
Pin 42 input S-AUD-R
Pin 44 input PC-AUD-L
Pin 45 input PC-AUD-R
No
Check input path from 1601
Yes
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 7401
Pin 159 sound select
No
Check circuit around
7401
Yes
Check if 7902
Pin 16 =5V
No
Eliminate short and open
situation
Yes
Check if 7902
Pin 4, 11, 3, 13,output signal
No
Replace 7902
Yes
Replace speakers