Sanyo DP42142 Service Manual page 6

Repair Flow Chart:Trouble Condition
Power LED turns OFF within 10 seconds after the TV power turns
Power LED turns OFF within
10 seconds after TV power
turns on.
Is 3.3V supplied to"K8B Pin1"during
Unplug cable from Main board
to T-Con board whether the
Are the 12V and 24V supplied from "K7B Pin6/7&9 "
Main board can not work.
Replace "Main board ".
(TABLE *1.0) Main board: Power-on Test Points
42" Models
P42142-00 Z5GH
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
(TABLE *2.0) Power board: 12V Test Points
42" Models
P42142-00 Z5GH
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
(TABLE *3.0) Power board: 24V Test Points
42" Models
P42142-00 Z5GH
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
No:0V
For Main board:
LED power on ?
Main board can not work.
Replace "Main board".
Yes:3.3V
Yes
symptom changed?
No
For Power board:
No:0V
during LED power on?
Yes
Power-on on Main board
Main K8B Pin1
12V on Power board
Power K7B Pin6/7
24V on Power board
Power K7B Pin9
T-Con board can not work.
Main board may also can not work.
Replace "T-Con board&Main board".
Power board can not work.
Replace "Power board."
Confirmation Voltage
Confirmation Voltage
Confirmation Voltage
on.
3.3V
12V
24V
Page 4