We have had the Samsung LN-R237W for 2 years. Enjoyed it until now. The screen keeps going from black to dark grey, no sound, and the TV will not go off unless we unplug it. At first we would hit the sides a couple of times and it would work but this solution no longer worked. Took it in for repair and they said it will cost $375 to replace the mainboard. We chose not to repair it. What is the cost of a main board and is it difficult to install. My spouse used to repair TV's many years ago, of course, not LCD . Or is there another solution to this problem?
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Re: Replace Main Board?
If he is familiar with soldering, try opening up the set and reseating all of the connectors and cables. Then look for poor solder connections and resolder any that appear "bad". Update this with the results.
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It sounds like your LCD panel or your T-con board is bad . Panels are expensive so I would replace the T-con board first. You have to open the TV and get the part number from the actual board in order to find the correct one. You can find parts at www.interliquidparts.com
reseat your LVDS cable and clean both ends with lighter fuel. This shouls solve your problem if not upgrade your firmware . go to the samsung site on the web with model#. If you still have a problem replace the main board.
this problem started on my LN-S4051D a couple of years ago. eventually the sound stopped working altogether. I then started using my surround sound speakers for the TV via optical out but soon that stopped working as well. I recently took the TV to a repair shop who said that the main board is bad and needs to be replaced. Labor plus parts was going to cost me $400. I said no thanks and paid for the estimate. Good luck.
Check with Samsung, this model should still be under the 3 year warranty. You are having a problem with the backlight power supply. You can look on the back of the unit for the manuf. date, if its less than 3 years then go to www.samsung.com and process the online service request form.
The back light is beginning to fail, thats why it goes shaded but you can still the picture on one side, do a google search for back lights for your make and model, there a few how to's to help you with changing the back light.
You need to do some more diagnosing of the problem. If you get sound and change channels take a bright flashlight and place it again the screen. Look for an image around the edge of the flashlight.
If you see an image that means the LCD controller board (TCON) is probably good.
The problem is probably one of three causes;
1) Inverter board is bad 2) CCFT (cold cathode fluorescent light) are bad. 3) Power to the inverter board is bad. You can also check the connectors.
If you have sound on the stations this is a problem in the display. Take bright flashlight and hold it against the screen. Look for an image around the edge of the flashlight. If you see an image then it's one of three problems;
1) The inverter board is bad. 2) The CCFT (cold cathode fluoresent light) are bad. 3) The power supply to the inverter board is bad. Someone knowledgeable in electronics can replace the bad part(s).