Question about Samsung PCN5425R 54" Rear Projection Television
You will need to repair the convergence circuit to fix the double image. The second issue of the "perfect focus" stopping at 37% will be fixed at the same time. It is halting because the sensors detect no movement of the blue image. here is a link to the part number and how to purchase the board. http://www.partstore.com/Part/Samsung/Samsung/BP9500142E/New.aspx
Posted on Jun 08, 2007
SOURCE: Projection TV
Fame, The symptoms you're describing appear to be convergence failure and probably only one of the convergence amps. That unit uses two STK392-040 IC's and it is HIGHLY recommended that you replace both - not just the one. The convergence amps are mounted to a large aluminum heat sink with a heat sink compound for the greatest heat dissipation. My personal experience with this particular model has been that replacing the IC's only restored normal operation in 9 out of 10 sets as opposed to having to replace any other corresponding resistors or other components. In laymen's terms it's probably only the convergence IC's that need replacing. I strongly suggest that you not tackle this one by yourself unless your are fairly skilled at soldering. Too much heat on this multi-pin IC will destroy them and they're not cheap.. It's also a bit difficult getting the old ones out. If you don't do the job yourself find a good reapir shop and ask if they have the IC's in stock. If you're not sure where to find a reputable shop call NESDA, (National Electronic Service Dealers Assn.) They can refer you to a qualified member shop in your area... If you do tackle this yourself, order only the Sanyo originals from places like B&D Electronics, Vance Baldwin, ACME or Samsung. And use a fairly good heat-sink compound...
Posted on Jun 03, 2007
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