No Power - Samsung LA32C630 Series Service Manual

4. Troubleshooting

4-1-1. No Power

The LEDs on the front panel do not work when connecting the power cord.
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Symptom The SMPS relay does not work when connecting the power cord.
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The units appears to be dead.
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The IP relay or the LEDs on the front panel does not work when connecting the power cord if the cables are
improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:
Check the internal cable connection status inside the unit.
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Major
checkpoints
Check the fuses of each part.
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Check the output voltage of SMPS.
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Replace the Main Board.
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1
1
1
2
Diagnostics
3
3
Make sure to disconnect the power before working on the IP board.
Caution
4-2
Power indicator LED is on?
Yes
Check the backlight on,
when 18p cable unconnected ?
Yes
Check 'Stand-By 5V' ?
- BD206 : A5V
Yes
Check 'Main power input' ?
- BD204 : B12VS
- BD201: B13V
- BD207 : B5V
Yes
Check Output of 'Stand-By Power IC' ?
- Pin#3 of IC202 : A3.3V
Yes
Check Output of 'Power IC' ?
- L201 : B3.3V
- L202 : B1.2V
- L204 : VAL_1.1V
- L203 : DDR_1.8V
Yes
Check Input power of 'T-con b'd'
- F1(T-CON) : B13V
Yes
Check Power of 'T-con b'd'.
- L9(T-CON) : VCC12
- TP_VCC33 : VCC33
Yes
Please, Contact tech support.
No
Check a connetion power code.
No
No
Change 18p cable.
Change Main Power Assy.
No
No
Change the Main Assy.
No
Reconnect or Change the LVDS
No
cable.
No
Change the T-con B'd.