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I have a HP MD5820N tv and it started making a loud humming noise and the colour went all dark and flickering and now will not turn on, the red lights flashes twice under the light bulb and thermometer pictures

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Sounds like The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
https://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; [Exclude the model number], in the "Search box at the top right of the display window of the Homepage" to get gathered related posts. See the site by a desktop. Mobile view has no search box. If you are viewing it by your mobile, see it in webview./

Posted on Nov 08, 2018

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Posted on Jan 02, 2017

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  • 308 Answers

SOURCE: red light on power button flashes, but no picture....blank screen

I would suspect a problem in either the backlight assembly, or the power supply that drives it. If it's the power supply, the part may be over $100.

Posted on Jan 18, 2007

  • 1 Answer

SOURCE: humming noise & color changes picture flashes from red to green

our 62hm15 had the same problem and it was the dmd fan, which means the whole light engine needs replacing. this was going to cost us $1600. I hope yours is under warranty

Posted on Aug 18, 2008

  • 1 Answer

SOURCE: HP Pavillion dv6000 - dark screen, no power noise, but power lights are on

1) Turn off your laptop.  2) Remove Power supply.  3) Remove the battery and put it back again after 1 min.  4) Put power back and restart. 
This should solve the porblem ! I have had it several times. 

Posted on Nov 29, 2008

Slinteriors
  • 8617 Answers

SOURCE: Samsung HLP4674W - changed bulb - still no picture - lights flash

If the lamp has been replaced I would think the Lamp ballast would be most likliest followed by the color wheel and then the Digital board. You can get any part needed for your model at www.tvrepairworld.com just leave them a email they respond quickly.

Posted on Aug 28, 2009

  • 3 Answers

SOURCE: I have a Samsung TV # HLP6163WX/XAA. A loud

I also have a Samsung HLP6163W 61in TV,had the same problem had to replace the color wheel. Went on youtube showed us how to do it our self. Saved a lot of money very easy. Good luck!

Posted on Jan 19, 2010

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