Repair Flow Chart: Trouble Condition
page 2
Green Power LED is on, but LCD backlights are not on.
Backlights are off, or only turn on and back off.
note #1
If the model is
DP46849-00, DP46849-03, or DP46819-00 ,
please order the SMPS, in adition to the Inverter. These
versions have a HV Transformer that may not be working.
Change the SMPS first, if that does not fix the no BL
problem, then change the Inverter.
This note only applies to these three 46" units.
(TABLE *1) Main Bd.: 12V & 24V Test Points
or
or
or
or
(TABLE *2) Main Bd.: "Power ON/OFF SW" Test Points
or
or
(TABLE *3) Main Bd.: "BL_ON" Test Points
or
or
(TABLE *4) Power Bd.: "24V" Test Points
or
or
US1J 26", 32"
Main K8B "1pin"
Main R1702
US1K 42", 46"
5V
Main K8B "1pin"
Main R1600
Main L1604
24V on Main Bd.
Confirmation Voltage
5V
Power ON/OFF SW on Main Bd.
Main K8B "12pin"
Main L1613
Model
Model
12V on Main Bd.
US1J 26", 32"
Main K8B "8pin"
Main L1604
US1K 42", 46"
Main K8B "8pin"
Confirmation Voltage
12 V
12 V
Confirmation Voltage
24 V
42"(00 ver) = 24V, 42"(01 ver) = 15V, 46" = 16V
Model
Model
5V_STBY on Power Bd.
Confirmation Voltage
US1J 26", 32"
Main K8B "12pin"
Main L1712
US1K 42", 46"
US1J 26", 32"
Main K8L "3pin"
Main R1754
3.3 V
US1K 42", 46"
Main K8L "3pin"
Main R1829
3.3 V
Model
5V_STBY on Power Bd.
Confirmation Voltage
US1J 26", 32"
Main K8L "3pin"
Main R1754
3.3 V
US1K 42", 46"
Main K8L "3pin"
Main R1829
3.3 V
On Main Bd.:
Are the 12V and 24V supplied from
Pwer Bd.?
(see TABLE*1)
no: 0V
Main Bd. is not working.
Replace "
Main Bd.
"
On Main Bd.
Is 5V supllied to "Power ON/OFF SW"
(see TABLE*2)
no: 0V
yes: 5V
Replace: "
Power
Bd.
"
and "
Wire Harness
"
yes
Power LED turns on.
But, LCD Backlight is not on.
no: 0V
yes: 3.3V
Yes.
Main Bd. is not working.
Replace "
Main
Bd
."
Inverter Bd. or LCD Panel is not working.
1st: Replace "
Inverter Bd.
"
(see note #1
)
If Inverter Bd. does not correct problem, then:
2nd: Replace "
LCD Panel
"
On Main Bd.:
Is the "BL_ON" voltage (3.3V)
supplied from Main Bd.?
(see TABLE*3)
Confirm wire harness connection.
Especially between Power Bd. and
Inverter Bd.
On Main Bd.:
Are the 12V and 24V supplied from
Pwer Bd.?
(see TABLE*1)
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