Question about Samsung HCL4715W 47" Rear Projection Television

2 Answers

HCL4715W - Shut off unexpectedly and won't power on..

I have a HCL4715W rear projection HDTV.

Last night it shut off - and now it won't power on. Instead, the red timer light on the front panel just blinks a few times and then it shuts off again.

Is it a bulb problem ? Any help would be appreciated.

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  • Peter Lee
    Peter Lee Nov 24, 2007

    After a power drop to 68vac for a couple of minuets the picture was darker and after this the picture was reduced in size with a 3" black border and hte color convergence was out, a so called Samsung tech came ad expanded the picture and then everytime the picture went bright it cut out, I would switch off and back on and it was OK until the next time, setting the color to low contrast and britness and it was ok, for longer. Then one night I switched on and it went Pheeeeewww and died. Samsung in Spain say they cannot (or will not) repair it.

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Seems I have a SP47W3HFX and the bottom of the left (from front) tube has brokern off just above the coils. parts anyone?

Posted on Nov 25, 2007

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HCL4715W - Shut off unexpectedly and won't power o - b8af615.jpg
It is

Posted on Nov 14, 2007

  • William Rayburn
    William Rayburn Nov 14, 2007

    It is most likely the convergence amps causing the problem.. With the power off and the unit unplugged remove the back. In the upper right corner - looking in the back - you'll see a board with two relatively large Ic's on it marked STK392-040. On the left corner of the board there is a connector, the board is marked +/-20v... Unplug that connector and plug the Tv back into power and try turning it on... If it powers up with audio you've just diagnosed your first Samsung.

    You have three options here (1) buy the whole board and replace it, (2) send the board out for repair, or (3) buy the amps and 3.9 low ohm resistors to repair it yourself... It will all depend on the skill level you think you have..

    If it's limited, sending the board in would be my suggestion and I'd recommend sending it to a shop that can modify the board with a cooling fan, like the picture above, to eliminate as much heat as possible. We modify them automatically for the ones we get in here. It's a $60.00 modification but it will save you from replacing the Ic's every couple of years.

    If I can help any further just let me know.

    Bill



    William Rayburn, CET

    Premium Technologies

    PO Box 442

    Long Beach, WA. 98631

    360-642-4993

    premtech@willapabay.org

  • William Rayburn
    William Rayburn Nov 14, 2007

    PS. The amps aren't cheap either - about $30.00 a piece...

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