Panasonic PV-D4742 Service Manual page 150

Cause: Audio DAC Problem
Check voltage at TP8022 on the Check Power line.
NG
DVD Decoder C.B.A.
Is it +5.0V ?
OK
Check signal at TP8416 on the Check X8501.
NG
DVD Decoder C.B.A.
(27 MHz clock)
OK
Replace IC8403. Replace IC8502.
(AUDIO D/A CONVERTER) (BUFFER)
V1 3.1 Vp-p
1 V
1 V 20 ns
TP8006
Cause: EEPROM Problem
Check voltage at TP8051 on the Check Power line.
NG
DVD Decoder C.B.A.
Is it +5.0V ?
OK
Replace IC8001.
(EEPROM)
Cause: Flash ROM Problem
Check voltage at TP8301 on the Check Power line.
NG
DVD Decoder C.B.A.
Is it +3.6V ?
OK
Replace IC8301.
(FLASH MEMORY)
Replace X8501.
NG
OK
V1 2.2 Vp-p V1 3.1 Vp-p
20 ns 1 V 20 ns
TP8207 TP8416
TROUBLESHOOTING HINTS
PV-D4742