I purchased this TV in 3/05 and it has been a fairly decent piece of equipment. Lately I have had issues with the screen , hoalf of the screen will go black, usually the bottom half. If i tap it it sometimes comes right back. I am wondering what could be wrong and what would it take to fix it properly.
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
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I had an LG 37" LCD that did this to me. Turned out to be bad solder joints on the side button board. Just reflowed and it starting working fine.
But now that I think about, I had another set do the same thing, only it wasn't the button board. I had to upgrade the TV's firmware via the USB service port. Just needed a USB flash drive and downloaded the firmware from the mfg's website. There were easy to follow instructions there too!
One of two issues/problems: 1) Main Power supply problem 2) High Voltage Power supply problem. A Good TV Service Shop that works on Philips would be the first place I'd call. It will be much cheaper to bring the TV into the shop instead of having a tech come out to your location. Possibly a $200 to 300 dollar repair. Blessings, A/V Media Guy
I had the same problem and fixed with a great online tutorial. Just replace 3 capacitors available at Radioshack onthe the board. 2662, 2663, 2664 1 is a 1000uf the others are 100uf. Max Volts need to be over 25. It worked great, check http://dynamicorange.com/2008/06/25/fixing-a-plasma-tv/
for more detail.
the power board needs to be inspected. you need a t20 torx bit, and phillips screwdriver. do not work on unit around carpet. stay away from carpet.you need a digital multimeter as well. remove back cover, and set meter to VDC. take black probe, and stick in one of the upper holes. look at the top right of the panel for a white sticker. this gives the proper voltage readings. on the power board, located middle top (big bd) look for the vs, vset, va, vsc settings on pow bd with red probe, test each one for proper voltage if 2 or more mismatches, the power bd needs replaced. do a ebay search for bd id number located on bd or simply type dell 4201 power bd.