The power supply used in these models televisions contained on two PCB assemblies. They are [1] Main Switching Power and [2] low B (DD power module) power boards. These two power supply boards are serviceable to board level only.
P801 is the AC input to the power supply and is fused by F001. P803 is a tuner ground on the power PCB. It is occupied by a green slide on connector rooted to the tuner area. P802 is a jumper between points located in the AC input.
P802 is used in non US models requiring the product to have a mechanical AC switch. In this model PE02 is on the power supply board but it is not used. This plug is available for ATSC ready models using Digital Board.
P804 is the supply for LCD. The following table illustrates voltages and resistances that should be measured to Cold Ground at P804.
The resistance readings may vary depending on the instruments used to measure them, but a reading significantly below what is listed above indicates a problem and should be checked.
SHUTDOWN
Shutdown on the receiver will, in most cases related to a thermal cause, one of the power supply lines, or power supply panels themselves. It will be indicated by a blinking of Power LED.
When a blinking LED symptom is observed, check the fans for rotation first. If there is no or only a partial rotation of either fan, check the voltage sources for them, then change the fan/s if necessary. If the fan voltage sources are incorrect, suspect problem with a Low B power supply panel.
If nothing related to fans or thermal shutdown is detected, since the unit is serviced to modular level, use the voltage and resistance values located in the above chart to detect other possible modular problems.
P801 is the AC input to the power supply and is fused by F001. P803 is a tuner ground on the power PCB. It is occupied by a green slide on connector rooted to the tuner area. P802 is a jumper between points located in the AC input.
P802 is used in non US models requiring the product to have a mechanical AC switch. In this model PE02 is on the power supply board but it is not used. This plug is available for ATSC ready models using Digital Board.
P804 is the supply for LCD. The following table illustrates voltages and resistances that should be measured to Cold Ground at P804.
Pin
|
Voltage
|
Resistance to Cold Ground
|
1
|
3.2V
|
90K
|
2
|
5V
|
11K
|
3
|
3.3V
|
55K
|
4
|
3.2V
|
46K
|
5
|
0V
|
0
|
6
|
0V
|
0
|
7
|
9V
|
>500 OHMS
|
8
|
9V
|
>500 OHMS
|
9
|
0V
|
0
|
10
|
0V
|
0
|
11
|
5V
|
>500 OHMS
|
12
|
5V
|
>500 OHMS
|
SHUTDOWN
Shutdown on the receiver will, in most cases related to a thermal cause, one of the power supply lines, or power supply panels themselves. It will be indicated by a blinking of Power LED.
When a blinking LED symptom is observed, check the fans for rotation first. If there is no or only a partial rotation of either fan, check the voltage sources for them, then change the fan/s if necessary. If the fan voltage sources are incorrect, suspect problem with a Low B power supply panel.
If nothing related to fans or thermal shutdown is detected, since the unit is serviced to modular level, use the voltage and resistance values located in the above chart to detect other possible modular problems.
