Originally Posted by
miked
I have a Samsung 40" LCD TV LN40B530P7N that has ghosting, other wise this is a great working tv that I would like to repair myself if possible.
In the past I have replaced blown caps in other lcd tv's and was able to make a good repair. For additional background I am a retired US Marine who was an Avionics Tech on helos, and I hold an Extra Class License (ke4ilg) so I believe I can do the repairs but can't decide what is the proper direction to go.
Ok so here's what I have done so far: I watched a lot of youtube videos and followed repair tips to no avail. One I followed was removing and re-inserting the ribbon cables from the T-Con board to screen input. This did not help.
Next I tried the internal self test on the tv's menu. This test displayed a color bar test and it was great with no ghosting at all. The self test stated that if the color bar was good then the problem is from the inputs to the the tv, ie cable box, dvd player etc.
So since I know the Directv box is working correctly I changed the input from HDMI cable to the component cables, RCA jack cables ,yellow, red and white. All the same results.
The main board has all the inputs including, AC power, cable input, HDMI input and component input RCA jack.
So I believe its either the main board or the the T-Con board. The used price on each of these boards about $100 for one and about $55 for the other. I don't want to buy the wrong one.
Anyone who feel qualified please let me know your thoughts and those who don't think you are qualified are also welcome to comment. Thanks in advance for your support. Mike
I want tocomplete this thread with the outcome. Short answer the tv will not be repaired.
A member supplied me with the contact information of a TV technician who did a telephone troubleshoot consult. (Bet you never expected to read something like that) The consult went well. I did the couple of actions suggested by the tech with no good effect and then purchased a replacement T-con board.
Once I installed the new T-con I got different results but the tv was not fixed. There is a bit more to it than I stated but not at all interesting.
The consult was very reasonable and confirmed my troubleshooting of the problem and confirmed what I thought was the likely problem.
The T-con board cost me about $49.00 the other likely board would cost a little over $100. Replacing that board is no guarantee that the tv would work since the bad board might have damaged both of the T-con boards.
I have chosen to cut my losses and move onto other projects. I have been successful in repairing two other LCD TV's in the past, in one I replaced capacitors and the other reinstalled the same ribbon wires on the T-con board.
I wish I have more wisdom to share but I did want to close this thread. Best to all and thanks to those who contributed. Mike
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