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Why won't my tv come on..the red light on the main board is on but nothing on the screen..what could be wrong?

Replaced x,y,power board, logic board doesn't light up

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Posted on Jan 02, 2017

premtech
  • 934 Answers

SOURCE: Red noise or flicker on bottom half a plasma screen

The old saying that a pictures is worth a thousand words could have been looking at this one... If the lower screen had been streaked in B&W or bands ran completely through the picture Old Drummer I would suspect the logic board also but that's lower y-board failure.
Bill

Posted on Nov 15, 2007

  • 70 Answers

SOURCE: Philips Magnavox 37" LCD Flat

Disconnect the LVDS Cable that runs from the small signal board to the display panel and apply power,if the screen comes on,the Small signal board (aka Scaler Bd ) is the faulty board. other than that,all that's really left that has gone bad for me is the logic board.

Posted on Jul 07, 2009

  • 8457 Answers

SOURCE: Replaced main board in Insignia NS-LCD19 TV and

Check all connections first,try agian.After that Change the LCD Inverter board might also dead.The inverter help backlight to screen to come on.

Posted on Jan 13, 2010

  • 2 Answers

SOURCE: My VP504fhdtv10a vizio plasma TV when connect

Logic Control D Board got nothing to do with this problem. This is your main power supply gone bad(usually not the sub power supply). I just repaired my VIZIO by replacing main power supply. Just remove back cover and your board will be right in the middle of the screen. Just get board part/serial # and google it. My best price was through eBay(around $100). Everything is fine now.

Posted on Feb 07, 2011

  • 22 Answers

SOURCE: Sanyo DP50747 Replaced Power Supply still not working

this issue is related to either the y sustainer and z sustainer boards, checking the fuses on the y/b will giving you a good indication, if they are open(bad) then you'll have a easy fix, if not, i would try replacing the y board first.

Posted on Apr 16, 2011

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1 Answer

Tv powers on, but shows a black screen. There is no audio as well. When the problem occurred, the blinking lights meant that there was a power surge of some kind. If I remember correctly that's what


Here is the customer support contact.

http://esupport.sony.com/US/p/model-home.pl?mdl=KDL50EX645&LOC=3&session_id=16ea092010cdea5681c8b46dbfcad1fc#/howtoTab

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Check and replace its main power regulator board. Before replacing it, check the fuse, can be located on this board itself.

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Bad main logic board. Probably won't be able to find it. You can try Encompas Parts. Good Luck to you.

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1 Answer

Blinks red 8 times


U have all the tools?U know and understanding basic electronic and also can do basic soldering work too?Yes?All tvs with LED power light indication blinking lights are 70-80% are problems relating to the tv power supply board.That the board where the tv power a/c cord plug into it.Tv must have be unplug and taken aparts and by checking the tv power supply board carefully by looking for leaking and dying components parts that are called capacitors parts.These dying and leaking capacitors parts are very easy to spots.These capacitors parts are alway bulges up on to it tops and will not have a normal plat tops like is suppose too.U should replaced all these dying capacitors parts with the same Micro Farad and it voltages up like 5 or 10 voltages higher than those old voltages that are was lables by those old capacitors parts was in the board,this tv will solved this tv problems.But these Plasma tvs are having a very common problems with it Y-Sustain main logic tuner board too that the board where it take in the tv incomming broadcasting signal wire plug into it must have to be replaced too,if the tv power supply board have no problems or was fixed but did not fixed the power light indication won't stop blinking.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole new refurbish power supply board and or the Y-Sustain main logic tuner signal board for the replacement.

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1 Answer

There are two green lights blinking at the bottom of the tv. where the power light is..i believe it's the opc lights. the tv shuts of it self and the two lil green light blink...we put the tv power...


The tv main logic board known as a tv Tuner signal board it is the causes and the problems.The tv main logic board,the tv Tuner signal board it is shorted and not taking in and sustance power from the tv power supply board anymore that why tv Power and OPC LED lights indication are flashing together.This main logic tv Tuner signal board that the board where that take in the tv incomming broadcasting signal wire plug into it.U must replaced the main logic tv Tuner signal bard to fixed this problems.If U have some mechanicals skills like take things aparts and putting it back together again?Yes,tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish main logic tv Tuner signal board for the replacement.Tries tv unplug,replug it back about an hour later.Tv might work again for awhile though,but to fixed this problems for good the main logic tv Tuner signal board must have to be replace.

Aug 22, 2011 | Sharp Aquos LC-52SE94U 52 in. LCD HDTV

1 Answer

My VP504fhdtv10a vizio plasma TV when connect power cord the Vizio in front light up yellow/amber but will not turn on. I have replace Logic Control D Board still have same problem. I do research online...


Logic Control D Board got nothing to do with this problem. This is your main power supply gone bad(usually not the sub power supply). I just repaired my VIZIO by replacing main power supply. Just remove back cover and your board will be right in the middle of the screen. Just get board part/serial # and google it. My best price was through eBay(around $100). Everything is fine now.

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2 Answers

Philips Magnavox 37" LCD Flat Screen 37MF331D Have replaced power board,main board,hit power a faint light on whole screen for about 2 seconds the nothing.


Disconnect the LVDS Cable that runs from the small signal board to the display panel and apply power,if the screen comes on,the Small signal board (aka Scaler Bd ) is the faulty board. other than that,all that's really left that has gone bad for me is the logic board.

Feb 19, 2009 | Toymax Magnavox 37MF331D 37 in. LCD TV

1 Answer

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

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