Philips DVD001, Руководство по обслуживанию, Страница: 20 / 40

Diagnostic Software, Trouble Shooting and Test Instructions EN 20 DVD640 /xx1 5.
5.3.4 No Sound
Figure 5-4 No sound
No sound
Pix and FTD display OK
Check Power
supply -12V to
the Mpeg board
Put the Mains switch to ON
and play a DVD disc
•
Check supply voltage at connector
1202
Pin 7
è
-12V
•
Check / Replace resistor 3204
•
Check / Replace cable connection to
con 1202
•
Check / Replace Power Supply Unit
NO
Check I2S signal
at Audio DAC IC
7201 input
YES
•
Check I2S data lines connection from
processor IC 7101 to Audio DAC
IC7201
•
Check / Replace processor IC 7101
NO
Check Audio
output at pin 9-
12/7201 Audio
DAC
YES
•
Check +5V supply to IC 7201
•
Check PDN (Power Down Mode )
voltage at pin 5/ 7201
è
+5V
•
Check /Replace R3229 and C2219
•
Check control data input at pin 6-8 of
Audio DAC IC 7201
•
Check / Replace IC 7201
NO
Check Audio
DAC input detect
at pin 16 of IC
7201= HIGH
YES
•
Check / Replace IC 7201
NO
YES
Check Audio
output at pin 1 & 7
of Audio buffer
IC7220
•
Check +/-12V supply to IC 7200
•
Check / Replace buffer IC7220
NO
PM3380B
1
Audio Output
CL 26532068_023.eps
100702
Check the Kill
signal at Pin 22 / 7301
--> LOW
•
Check / ReplaceVide DAC IC7301
•
Check the mute circuitry
•
Check +5 V and -12 V supply to the
mute circuitry
•
Check the components in the
mute circuitry
NO
YES
YES
1.00 V / DC
500us / div
S3-4-5-6
1
ch1
ch1
1V / div DC
50ns / div