Samsung LA22B650T6M, Service Manual

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4-2
4. Troubleshooting
4-1-1. No Power
Symptom
The LEDs on the front panel do not work when connecting the power cord.
The SMPS relay does not work when connecting the power cord.
The units appears to be dead.
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Major
checkpoints
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.
Check the fuses of each part.
Check the output voltage of SMPS.
Replace the Main Board.
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Diagnostics
Does proper Main DC B5V
appear at IC1002?
Does proper DC A3.3V
appear at IC1009?
Change the Main Assy
BN94-02990A
No
Yes
Does proper DC B3.3V, A1.2V,
DDR1.9V appear at
IC1004, IC2004?
No
Yes
Lamp(Backlight) Off,
power indicator LED is on?
Yes
No
Check a connetion power code.
Does proper Stand-By DC
A5V, A13V appear at CN1001?
No
Change Main Power Assy
BN44-00232A
Yes
Yes
Change the LVDS Cable
BN96-07252B
Lamp(Backlight) on, no video
No
Check a other function
(No picture part)
No
Caution
Make sure to disconnect the power before working on the IP board.