The power supplies used in this series TVs consists of four boards. Since troubleshooting should be done at board level to determine which board have the fault. A modular level approach is given here.
The supply boards are Main Power, Sub Power, Low B1 and Low B2.
The Main Power Board generates a verity of supply voltages use through out the unit. See the tables.
|
MAIN POWER BOARD _ CN201
|
|
|
1
|
171.3VDC 500K
|
|
2
|
171.3VDC 500K
|
|
3
|
170.8
1M
|
|
4
|
NOT CONNECTED
|
|
5
|
0
|
|
6
|
0
|
|
7
|
0
|
|
8
|
69.9
>2K
|
|
9
|
0
|
|
CN202
|
|
|
1
|
3.07V
|
|
2
|
2.43V
|
|
3
|
4.87V
|
|
4
|
0
|
|
5
|
2.19V
|
|
6
|
20.28V
|
|
P808
|
|
|
1
|
11.88
|
|
2
|
11.88
|
|
3
|
11.88
|
|
4
|
0
|
|
5
|
0
|
|
6
|
0
|
|
7
|
.131
1.4K
|
|
P807
|
|
|
1
|
20.28
|
|
2
|
20.28
|
|
3
|
20.28
|
|
4
|
0
|
|
5
|
0
|
|
6
|
0
|
|
7
|
31.9
|
|
8
|
11.88
|
|
9
|
4.88
|
|
10
|
3.3
|
|
11
|
3.25
|
|
12
|
4.87
|
|
13
|
.13
|
|
P809
|
|
|
1
|
25.9
|
|
2
|
25.9
|
|
3
|
25.9
|
|
4
|
25.9
|
|
5
|
0
|
|
6
|
0
|
|
7
|
0
|
|
8
|
0
|
SUB POWER BOARD VOLTAGES
|
CN805
|
|
|
1
|
69.9
|
|
2
|
69.9
|
|
3
|
0
|
|
4
|
0
|
|
5
|
0
|
|
CN201A
|
|
|
1
|
3.05
|
|
2
|
2.42
|
|
3
|
4.88
|
|
4
|
0
|
|
5
|
3.2
|
|
6
|
20.28
|
|
CN808
|
|
|
1
|
3.45
|
|
2
|
3.45
|
|
3
|
0
|
|
4
|
0
|
|
5
|
5.07
|
|
6
|
0
|
|
7
|
0
|
|
8
|
0
|
|
9
|
3.2
|
|
10
|
0
|
|
|
CN201A
|
|
171.2
|
1
|
|
171.2
|
2
|
|
171.2
|
3
|
|
NOT CONNECTED
|
4
|
|
0
|
5
|
|
0
|
6
|
|
0
|
7
|
|
69.9
|
8
|
|
0
|
9
|
|
CN806
|
|
|
1
|
69.8
|
|
2
|
69.8
|
|
3
|
0
|
|
4
|
0
|
|
5
|
0
|
|
CN802
|
|
|
1
|
5.07
|
|
2
|
14.88
|
|
3
|
0
|
|
4
|
0
|
|
5
|
150.3
|
|
6
|
0
|
|
7
|
0
|
|
8
|
0
|
|
9
|
0
|
|
10
|
171.2
|
|
11
|
171.2
|
|
CN803
|
|
|
1
|
5.07
|
|
2
|
14.87
|
|
3
|
0
|
|
4
|
59.7
|
|
5
|
0
|
|
6
|
0
|
|
7
|
0
|
|
8
|
0
|
|
9
|
0
|
|
10
|
0
|
|
11
|
0
|
|
12
|
0
|
LOW P1 POWER BOARD VOLTAGES
|
P810B
|
|
|
1
|
3.18
|
|
2
|
4.88
|
|
3
|
3.24
|
|
4
|
3.29
|
|
5
|
0
|
|
6
|
0
|
|
7
|
9.18
|
|
8
|
9.18
|
|
9
|
0
|
|
10
|
0
|
|
11
|
5.15
|
|
12
|
5.15
|
|
P807A
|
|
|
1
|
20.26
|
|
2
|
20.26
|
|
3
|
20.26
|
|
4
|
0
|
|
5
|
0
|
|
6
|
0
|
|
7
|
31.9
|
|
8
|
11.89
|
|
9
|
4.87
|
|
10
|
3.29
|
|
11
|
3.249
|
|
12
|
4.88
|
|
13
|
.131
|
|
P823B
|
|
|
1
|
9.19
|
|
2
|
0
|
|
3
|
5.14
|
|
4
|
5.21
|
|
5
|
0
|
|
6
|
3.79
|
|
P811B
|
|
|
1
|
4.86
|
|
2
|
0
|
|
3
|
0
|
|
4
|
0
|
|
5
|
0
|
|
6
|
31.9
|
|
7
|
11.89
|
|
8
|
6.66
|
|
9
|
3.47
|
|
10
|
3.47
|
LOW B2 POWER SUPPLY BOARD VOLTAGES
|
P816A
|
|
|
1
|
3.43
|
|
2
|
3.43
|
|
3
|
3.43
|
|
4
|
0
|
|
5
|
0
|
|
6
|
0
|
|
7
|
3.42
|
|
8
|
3.42
|
|
9
|
3.42
|
|
10
|
0
|
|
11
|
4.84
|
|
12
|
0
|
|
13
|
9.06
|
|
P817B
|
|
|
1
|
4.8
|
|
2
|
0
|
|
3
|
0
|
|
4
|
0
|
|
5
|
0
|
|
P819
|
|
|
1
|
11.1
|
|
2
|
0
|
|
3
|
.09
|
|
P808A
|
|
|
1
|
11.88
|
|
2
|
11.88
|
|
3
|
11.88
|
|
4
|
0
|
|
5
|
0
|
|
6
|
0
|
|
P818
|
|
|
1
|
11.1
|
|
2
|
0
|
|
3
|
.09
|
If a power supply panel has been replaced or in the unlikely event of a Plasma Panel change, certain poser supply adjustments should be done. The adjustments Vs, Va, Vsc, Vset and Ve determine the voltage supplied to the plasma screen, and are controlled by a variable resistor located on the supply panels. As incorrect voltage level may cause shutdown or screen damage, it is important to measure the DC voltage levels at each test point prior to adjustment. The voltage requirements are clearly marked on the display panel.
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