Table of Contents
Advertisement
1
Waveforms
Input signal: 1kHz
A
Sound volume is fixed to 25.
IC4402 - pin 21
33
V: 50 mV/div H: 200 nsec/div
IC4701 - pin 35, 36 (AC)
36
V: 100 mV/div H: 400 µsec/div
B
C
DTV doesn't work
⇒ DTV
DTV (Digital Terrestrial Video)
doesn't operate.
Yes
D
Is the power-supply voltage of
CN4002 normal?
Yes
When power ON, is RESET_DT
(IC8401 - pin 159) Low after
D+3.3V standing up?
Yes
Do you communicate by TXD_DT
(IC8401: 103) and RXDDT
(IC8401: 102)?
Yes
E
Is the signal from IC6301 to
IC7201?
Yes
Is the signal input from IC7201 to
IC8001?
Yes
Has the symptom been settled
when the MAIN Assy is replaced?
Yes
Finishing troubleshooting.
F
102
1
2
IC4402 - pin 29, 30 (AC)
IC4701 - pin 19, 20 (AC)
34
35
V: 200 mV/div H: 400 µsec/div
V: 100 mV/div H: 400 µsec/div
IC7101 - pin 1, 2 (AC)
IC4007 - pin 3, 5 (AC)
37
38
V: 100 mV/div H: 400 µsec/div
V: 100 mV/div H: 400 µsec/div
No
Check between CN4002 and
P8 (POWER SUPPLY Unit).
No
Check around IC6902.
No
Check between IC8401 (pin 102,
103) and IC6301 (pin 305, 406).
Exchange IC6301.
No
Check between IC6301 and
IC7201. Exchange IC6301 if there
is no problem.
No
Check between IC7201 and
IC8001. Exchange IC6301 if there
is no problem.
No
The panel is defective.
PDP-6071PU
2
3
NG
Replace the MAIN Assy.
3
4
4
Advertisement
Table of Contents
