Lightning struck my Samsung UN40D5005BF television. It still worked but the picture was dim. Since it worked I figured the power supply was not bad. I replaced the only other board in it. The Main Board. Shortly before the board arrived the TV quit all together. After installing the Main Board I get a little red led on the front but no TV. If I press the power button the light will go off for about 1 second and then it will come back on and just sit there. Still not TV. Any Suggestions????
Lightning damage can do a # on LCD TV's. I've seen cases where it took out power supplies and main boards at the same time. I'm not one who likes to use the "shot gun" approach. You would need to get the set professionally diagnosed in my opinion. Where did you get the main board from?? Are you sure it is a working board?
I got the main board from Shopjimmy.com. I also ordered the power supply and it hasn't come yet. The power supply is the only board other than the main board in the unit. I'll try that before I give up. Still both boards was only around 150.00 as opposed to buying a new 40" television for 5 to 7 hundred dollars. And if that doesn't fix it then I'm not out that much.Thanks for the help.
Shopjimmy is know for good parts, I've done a lot of business with him. Hold on to the new main board, there is a chance that once you replace the power supply, you may discover faults with your original main board.
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SOURCE: Westinghouse LTV-32w6 power light on, no video, no sound
One thing is to make sure the inverter board is unplugged when testing the voltages. A shorted inverter will shut down the power supply if the fuse dosen't blow first. There are fuses that don't look like fuses so they can be missed. The next thing would be to look for a connector from the main to power supply and see if there is a pin labeled power on or p.on or similar. The main board should turn this line high(5V) when you push the power button. If not you probably have a bad main board. Unless you can find good used boards they are both expensive. Around $200 for PS and $300 for main.
SOURCE: proview MA-32EF1AC TV won't turn on.
Power Unit might have some symtoms, But I believe cause might be on the main circuit. If power had totally failed It wouldnt give any output. Most of the swithching power units have overload protection. So if there is a component takes high current it stops providing the current. In order to check the power supply you can unplug the connection to main circuit and test with multimeter. For this case a qualified hands on technician's assistance unavoidable. As circuit should be diagnosed what is the cause of the issue. Especially Power Transistors (MOSFETS) should be checked.
Good Luck
SOURCE: TV does not turn on/red led flashes 7 times in front
this is common issue with this model and through your troubleshooting is tied to y main board. blinking led on logic main in normal operation. when replacing y main always good idea to replace y upper and lowe buffer boards as they complete a circuit and sometimes replacing one without other could cause additional failure on remaining boards
SOURCE: Samsung TV won't turn on- trying to fix it. A challenging problem
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.
SOURCE: Panasonic TH-50PE700U red light flashing 6 times
Replaced the sc board and tv works fine again.
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