Tip & How-To about Televison & Video
You turn on your beautiful LCD flat screen and when it boots up it has a picture on the bottom but nothing but black on the top. What is wrong?
Since the bottom half of the picture is working we know that the circuits which drive the signal and display are OK. They are the same for the top and bottom.
The difference is there are two YSUS drivers for the unit. One on the top and one on the bottom. They are referred to as the Upper and Lower YSUS drivers. They provide the signal to the display. You have lost the one on the top.
Unplug the unit and lay it on a flat padded surface. Remove the rear cover by taking out all the screws around the perimeter. Some screws in the center of the back may have to be removed. They should be obvious.
Once the back is off look on the left side of the unit. There should be separate boards (split top and bottom) which are the YSUS drivers, top and bottom. The boards are only about 1 to 1 and 1/2 inches wide and occupy 1/2 of the space from top to bottom.
You may have to remove the YSUS board, and maybe even a support beam to get the driver board out because the Upper and Lower YSUS boards are usually located under the main YSUS sustain board.
If you go to http://www.encompass.com and input the model number all the parts will be listed. There may also be a service manual available for downloading and you can scroll through the parts to find the Upper YSUS board. In addition the board should have the part number on it.
For Panasonic it generally begins with TNP-XXXXX. Your other option would be to look for the part called "YSUS upper driver" . Order this part and install it and you should have a working set.
I have a tip at http://www.fixya.com/support/r6981868-replace_circuit_board_in_modern_tvs which explains the proper procedure to remove and replace a modern electronic circuit board.
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Posted by Kim... on
May 27, 2012 | LG 37LC2D Television
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