My Samsung PN50C490B3DXZA will not power on. I just installed a new power supply board for it today. I press the power button on the TV, and it appears to be getting power. But it does not power on. What is my next step? Should I replace another board now? Please help me out! Thanks!
Hi Mike,
I appreciate your DIY effort. Were you sure of power supply board being bad? From what you have mentioned, the main board seems to be bad. Because if the power board is good, the set will not power on unless it receives the power on command from the main board.
One more thing, in most of the Samsung sets on disconnecting power supply and main board, If you get the backlights, power supply board is OK and the main board is bad. Please try this. Good luck.
Testimonial: "Thanks Sp Gupta for your reply! I was able to get the other boards on eBay, and will replace them this week. I got the Y-Main board, the Main Board, the X-Buffer board, and the X-Main board. I'll try replacing the Main board as you suggest next. Hopefully doing that will give me a picture on the screen again. If not I have the other boards that I can change out after that."
SOURCE: how hard it is to replace by yourself main board Samsung LN-T4065
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.
SOURCE: Samsung lnr238w (23'') LCD TV has sound but no picture.
You got sound meaning the power supply and mainboard have no problem at all. Look at the back, have you seen back light lit up?
If there is light, the problem may come from T-con board.
If there is no light so the inverter board has defective.
SOURCE: new lamp turns on flashes 7 times
just replaced lamp and power light goes green then orange and starts to blink 3 times
SOURCE: Power Supply Board for SAMSUNG 40" LCD TV Model LA40R81BX
You'll find some Samsung power supply boards here : http://www.usefulparts.com/index.php?main_page=index&manufacturers_id=11&sort=20a&filter_id=98&alpha_filter_id=0
but you have to open your TV first and find out model number
SOURCE: Why won't my Samsung UN40D5005BF come on?
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?
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