Question about Samsung HCN473W 47" Rear Projection Television
The set first started shading blue and perfect focus would only go as far as 37%. The set then shut down completely and when I turned it back on, the timer light on the front just flashes and I can hear something like a relay clicking in and out as if the t.v. is trying to fire up, but nothing more happens. It just keeps clicking on and off. I purchased a new convergence board from Future Shop and installed it, but it still won't fire up, and it is still flashing and clicking on and off. Any help would be appreciated. I'm hoping maybe it's a fuse or something that burned out in the power supply because of the convergence problem, but I'm stuck at this point. Thanks for your help!!
From what your describing the convergence amps, one or both, have probably failed and opened in the convergence circuit. That unit takes two STK392-040 amps and the feed resistors to those amps should be tested as well for any change in value.
For a shop this is a routeen job, we see them every day. But for a layman to tackle it - it could be the repair from hell.
The STK392-040 is both heat and static sensitive, so your $19.95 radio shack special soldering gun could ruin them in a blink of an eye.
They're mounted on the board against a large aluminum heat sink on the signal side of the chassis with heat sink compound and they're a multi-pin IC so they're not that easy to take apart and put in. Lining up all the pins to drop exactly where they're suppose to is a trickey task even for a technician, but then we have a few tricks that experience has taught well...
Call around and ask the shops what they charge for changing-out the convergence amps and testing the feed resistors in that circuit.. I would suggest taking the unit to them and save whatever they charge for a pickup and delivery.
Hope this helps!
Posted on Nov 11, 2007
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Posted on Jan 02, 2017
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