Sanyo DP26649 Service Manual page 5

Repair Flow Chart: Trouble Condition
Power LED turns OFF within 10 sec of Power ON.
Power LED turns OFF within
10 sec of Power ON.
On Main Bd.:
Is 5V supplied to "Power_SW"
during LED ON time?
(see TABLE*1)
yes
Are 12V and 24V supplied
from Pwer Bd. during LED ON
time?
(see TABLE*2)
yes
Unplug cable from Power Bd. to
Inverter Bd.:
Is this symptom changed?
no
Unplug cable from Main Bd. to
T. Cnt. Bd.:
Is this symptom changed?
No.
Main Bd. is not working.
Replace "Main Bd."
(TABLE *1) Main Bd.: "Power ON/OFF SW" Test Points
Model
US1J 26", 32"
US1K 42", 46"
(TABLE *2) Main Bd.: 12V & 24V Test Points
Model
US1J 26", 32"
US1K 42", 46"
Model
US1J 26", 32"
US1K 42", 46"
no: 0V
Main Bd. Is not working.
Replace "Main Bd."
no: 0V
Pwer Bd. is not working.
Replace "Power Bd." and
"Wire Harness".
yes
Inverter Bd. Is not working.
Replace "Inverter Bd."
yes
T. Cnt. Bd. is not working.
Replace "T. Cnt. Bd."
12V on Main Bd.
Main K8B "1pin"
or
Main K8B "1pin"
or
12V on Main Bd.
Main K8B "8pin"
or
Main K8B "8pin" or
24V on Main Bd.
Main K8B "12pin"
or
Main K8B "12pin" or
Main R1702
Main R1600
Main L1604
Main L1604
Main L1712
Main L1613
42"(00 ver) = 24V, 42"(01 ver) = 15V, 46" = 16V
page 4
Confirmation Voltage
5V
5V
Confirmation Voltage
12 V
12 V
Confirmation Voltage
24 V