Question about Televison & Video
Posted by Anonymous on
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Posted on Jan 02, 2017
I had the same problem happen to my 4 year old LNR408DX/XAA this weekend. After doing some research on this and other sights I decided to try and tackle the problem. A person described how he fixed his mom's set by soldering a jumber from a component on the "T-Con" board to a connector. I performed a simular repair by solder a jumber across the SMD component labelled "P". Bottom line is the T-Con board was the problem.
Posted on Mar 08, 2010
It's not the x main. 90% of the time it's a y buffer that goes out. It's usually the top buffer. 3/4 of the time the buffer takes out the y main board too. You cannot just replace the y-main or buffer because it will just burn out the other within seconds. Also about 1/4 of the time it'll take out the top transformer on the power supply too. The solution? First disconnect the power to the y main board. turn on the television and check the voltages coming off of it. Careful it's high voltage 208V! Remember it's DC too. Then disconnect the buffers from the y main board. You can try powering the y-main up to see if the little LED lights up. This does not indicate it's working though but it'll tell you if it is possible to fix. The fixes for these boards is only for electronics guys. It usually involves replacing 1-3 capacitors and 1-4 FET's. Since a bad buffer can take out a good y main in seconds it's usually recommended that one replace all 3 boards at the same time. It's a $250 fix. How do I know all this? I've now repaired 5 of these televisions. I owned one and spent close to 600 repairing it. I bought misc parts and broken sets online for months before I had 2 different repair guys walk me through the process of repairing them. I had so much cash tied up in parts that I bought 3 more dead sets and repaired them to justify all my spending. I've never had an x board fail. I've had EVERY top buffer fail. I've had all but 1 y-mains fail. and 1 lower buffer fail. I've also had the y buffer fry it's top chip, blow a capacitor and FET on the y-main, and fry the top transformer on the power supply before my eyes. It only took 5 seconds. Replacement of the 3 y boards will almost always fix the sound but no picture problem. Hope this helps!
Posted on May 26, 2010
I am now having this same exact problem.
Apparently there are 4 boards that can be the issue. BUT you must bring it to an Authorized unauthorized service center to resolve the issue. I brought mine to an unauthorized service center and they can not buy the part. My particular issue is a TCOM board on the back of the display which only authorized dealers can buy. In fact if an Unauthoirzed dealer calls up the J&J Samsung parts distributor J&J doesn't even have it their parts inventory so as far as they know the part doesn't exist. which it does you just need to call an Authorized part dealer in your area which you can get the number from 800 SAMSUNG
There are 4 boards unauthorized service centers are allowed to sell 2 PC BOARDS
1 POD PCB
1 Power PCB
When you call Samsung get a CLAIM nuber...
WHAT A PITA
Posted on Aug 13, 2010
SOURCE: I have a Samsung LNR408DX/XAA
If you still get sound then the defect is after the image processor - either in the video board or on the T-Con board. The only way to know for sure is top open the tv and test it - a job for an well-equipped pro.
If the tv is totally dead but the source lights appear to light normally then the mainboard has failed and it will have to be replaced. Here it is
If not even the lights are on then it's the power source the one that has failed. You will have to open the tv and check the rest of the tv - the source could have failed because another part has failed first and it has killed the source in the process. Here it is
Posted on Feb 26, 2011
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