Question about Samsung UN40B6000 40 in. HD-Ready LCD TV
TV took a nasty power hit through FIOS coax; 110v. Power went from the coax out through the HDMI port and also fried the set top box. Isolated fault to short on light fixture and improperly wired outlet(no ground.) At application of power, TV clicks on and make a buzzing sound but does not power screen. Need advice as where to start. Power goes into main PCB so will check fuses. If those are good, should I bother with the cost of replacing boards? Is there a way to detect a bad board? Any specific equipment besides a multimeter?
I can almost assure you that at least your main board is toast. May have damage to other boards as well
Posted on Jan 20, 2013
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Posted on Jan 02, 2017
SOURCE: Screen goes completely out.
when it blanks out, tuen the lights out in the room, and shine a flash light at the screen, see if you can see the picture, if you can, it is the inverter moard blamking out, thats the board that lights the back lights, if you cant, hit the input button on the remote, if the TV comes back with a picture, it is a problem with the main board, in paticular the componant input on the main board
Posted on Jan 10, 2009
I had the same problem. I live in NJ and called the local authorized "service provide" listed on the Samsung website. What a joke. Quoted $350 just to show up, never showed up. So I opened my own TV. Took off the plastic back (10 screws) took off the large metal RF shield (12-14 screws) and noticed a blown component. The markings on the component were KL15L and it is apparently an NTC Thermistor. Obviously it got fried and not knowing if there was other damage I decided to set out to replace the entire Power PCB Board Assembly and not the component. There were two part numbers on the assembled board (BN97-00457E & BN94-00622E). After searching online I also found a suitable replacement number for these (BN96-04896A). I found two places who claimed to have the part or have it on order (shopjimmy.com and vancebaldwin.com). After placing orders with both and having neither come through, I broadened my search and found out that the LNR409D was basically the same model as my LNR408D so I looked for its Power PCB Board Assembly part number which turned out to be BN41-00521B. Google search for that part number showed the item available on ebay. I bought it a week ago (ebay 260311519904) for $144 plus $12 shipping. I removed the bad board an hour ago (6 screws about 7 connectors) installed the new one, plugged in the connectors, replaced the covers, plugged in the TV... AND IT WORKS!
Suggestion: If your TV is out of warranty then open it up (what have you got to lose) and see if the problem is obvious and maybe something you can fix (replace) yourself. The parts, spare boards, etc. are out there if you look.
Posted on Nov 16, 2008
I would replace the power supply as they are not too expensive.
New M/board, should be OK. Have you checked the RAM for errors and installed the latest BIOS firmware?
Posted on Dec 06, 2010
Yes based on your testing it appears that the power supply is at fault solely and you can opt to attempt a repair or replace it altogether. Unfortunately you will not be certain that the main board does not also need to be replaced until you have repaired the power supply.
Posted on Feb 05, 2011
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