Question about Samsung HLP4663W 46" Rear Projection HDTV
It sounds like you may have a Power supply problem since the set will not turn on at all and the only power present is form monitoring functions which use a separate power supply any way. Now to trouble shoot this problem you will need these basic tools:
a Multimeter (to measure DC and AC voltages)
a Schematic Diagram (To locate Test Points and voltages levels)
This should cover what is needed.
First unplug the TV and check the fuses using the ohmmeter setting on the multimeter. Then locate the power supply section which feeds from the main power rectifier plug the set in and turn it on, measure the DC voltage off of the bridge rectifier. Then locate the voltages from the various regulators to determine if these are active. if not check the FET used to activate the switching transformer, as with the other instructions measure the voltages and determine if the FET is being switched on and off by the driver oscillator. If this is not occurring then it can be assumed that a power supply problem might be an issue. I would then unplug the set attempt to take resistance measurements to make sure that there were no low resistance events (shorts) on the various stages of the TV.
This should reveal if the power supply board is bad, if it is take the board find out its part number and order it, I would not attempt to effect repairs on the circuit because more damage might be inflected on the TV set by doing so.
Now if this is something you rather not do, I would then suggest that you take the TV to the shop for repairs.
I hope this helps,
Posted on Jan 20, 2008
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