I have a 42 inch Samsung Plasma. The bottom half of screen goes black (intermittently). Sometimes instead of black, it turn into pastel colroed vertical stripes. It goes away for awhile if we turn the set off and then back on in a few minutes, but then the problem recurs.
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First try using Component cables instead of the HDMI cables and see if that fixes the problem. If it does then you have a bad HDMI cable. If it does not then you might have a bad Y-Main bd or X-Main bd or a Main bd. It can also be bad buffer bds. Have a trained Samsung tech look into the problem.
hi....Your tv picture is managed by several boards, the two specific ones are the ysus and the xsus. The Y controlls the horizontal pixelation and the X the verticle, if you are having horizontal problems then its the Ysus thats faulty, on this particular set, the Ysus board has two accompaning buffers that are particularly troublesome. I've had more than one of these sets in the shop recently with the same ailment.Sounds like your buffers are starting to go out. The screen is split horizontally by the two long skinny buffers attatched to the Y main, if the bottom one has one leg in the grave you'll be getting a partially black screen or no picture at all. The colored lines running through the screen are more typical of a failing buffer. Are you interested in taking this set apart and putting a couple hundred into fixing it? When buffers go they usually take the Y main too. Worse case scenario you're gonna be out about $350 dollars to fix it yourself. Best case, a ribbon is loose on the bottom buffer and with a dismantle you'll be able to connect it again..
intermittent loss of picture on either bottom or top half of screen is specific to y buffer boards located on left side of screen going from top to bottom when looking at back of tv. the y lower buffer would be the board to replace to resolve the loss of bottom half of picture. if the top half also is going out intermittently could tied to upper buffer as well but just a note the y main board to right of these buffers drives those two boards so in some cases could also be part of the problem. if only bottom half is affected i would recommend replacing lower buffer only
its the lower buffer card.. (y buffer lower board) they cost about $90.. i changed mine myself on my samsung hpr-4262 42 inch plasma.. pretty easy,, took approz 20 minutes.. the card has 3 ribbon cables and 3 other connectors and 1 screw.. removing all the screws out of the back pannel took the most time.. i found the repair manual for my tv on line for $13 (download PDF file) the manual had a trouble shooting section and what board to replace for each problem.. got the manual from here http://store.payloadz.com/ ordered the replacement board from www.partstore.com
I have been trying to fix one of these tvs and found out from a repair man that the lower half going blank means a problem with the lower buffer. and that is also what the manual I downloaded says. have you checked that?