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I have a Toshiba TV Model #46XV545U that turns off 5-6 seconds after turning it on. Could it be the main board or the power supply? Or something else? Thank you for your help.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 718 Answers

SOURCE: Vizio L37hdtv10a fails to fully turn on

You will have to isolate the main board and Inverters.
Unplug the inverters and turn on the set.
If it "turns on" then try re-connecting each inverter seperately to see if only one is causing the problem.

Posted on Mar 07, 2009

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SOURCE: olevia 437-s11

Most likely the CCFL inverter has been the problem all along....

Posted on Oct 10, 2009

  • 1 Answer

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well aparently all you do is fish for customers to buy into your sevice!
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Posted on Nov 13, 2009

  • 16 Answers

SOURCE: Tv wont turn on

Replaced two N-Channel Mosfet transistors(FQPF13N50CF-ND) and some faulty electrolytic caps in the power supply. I found the Mosfets online at Digi-Key. Mosfets are difficult to read. Only one read bad but I replaced both because they are in the same circuit. Set works great now.

Posted on Mar 30, 2010

SOURCE: 42rv530u toshiba tv no sound no picture change

The 42RV530U is known to develop problems in both the power board and the main board. You can check out our power board repair service at
http://www.coppelltvrepair.com/p/442/repair-service-for-toshiba-42rv530u-power-board-75010942-dead-tv-or-clicking-on-and-off-problem
and I'd also recommend that you search for 42RV530U at http://blog.coppelltvrepair.com as we will eventually release an article on how to test the board.
Hope this helps.

Posted on Apr 25, 2013

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You need to find out which board the led driver resides on. The main board sends a signal to the power supply board to turn on the LED's Look on the power supply board for swollen capacitors. They all have to have flat tops. If any are bulged, they have to be replaced www.shopjimmy.com. TV Parts Universal TV Stands DLP Chips ShopJimmy These guys can tell you which board you need.

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. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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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.
http://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; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced.

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STOP Get a SERVICE MANUAL and follow instructions before you make it any worse by "Mucking around with it" it needs to be serviced in a set careful methodical way u cant just replace boards and hope as those boards may damage or be damaged, to have any chance u need to get the book plain and simple less expensive too.

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Please take this steps on how to determine the problem:
1. Open the back cover.
2. Check the power supply output...It should have 5vdc for the main board..12vdc or 16vdc for the audio and 24vdc for the back-light inverter..
3. If those 3 voltage supplies have encountered voltage drop...The problem could be on power supply board..
4. If the power supply output is normal..The problem could be on the main board...
5. If the problem is power supply you should check if the capacitors are bulged on the top and try to replaced it..If you can't do that you can purchased new power supply board..
6. If the problem is on main board there is no D.I.Y repair on that so you need to buy a new main board that fits to your TV..
Hope this solution will be helpful..

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