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I have a Magnavox 42mf230 that when you turn it on, the blue light comes on and I can hear things power up but the screen is black and no sound. I've taken the back off and the fuses check out and no capacitors are bulging it appear bad, what could be causing this issue?

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  • 115 Answers

Try in put signal from av source

Posted on Nov 19, 2013

  • Chad Peppin Nov 20, 2013

    I'm able to get sound when hooked up to my DVD player and the screen is still black.

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6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Syntax Olevia 30" LCD - blue screen, then black screen, sound is on

you have a broken inverter board. I have a LT30HV, and it had the same problem. The inverter board supplies power to the backlight. Swap it out with a good one, and you're back in business.

To test, take a bright flashlight and point it at the screen just an inch or so off the surface. If you can see your picture, then you have a blown inverter.

it may not be worth fixing it. Wait for a good sale on a new one. My inverter cost about 150, and it was a remanufactured part. Not as good as the original part as it flickers just a tad. I had to take the entire TV apart, with pieces literally everywhere. My cats loved it.

Posted on Nov 15, 2008

  • 230 Answers

SOURCE: No longer turns on

It's well worth replacing the capacitors, but this problem can be caused by a short on the power supply (Which is what the caps do). Most shorts that arise in power supplies are result of a shot transistor or diode and of course the electro caps. Check these while your changing the caps.
Good luck with it.

Posted on May 25, 2009

jhinsincity
  • 616 Answers

SOURCE: Digistar PH-4210D Black Screen

Plasma tvs do not have "back lights" LCDs do. you probably have a bad driver board along with the upper or lower buffer board or maybe both, best to have a tv shop look at it.

Posted on Aug 30, 2009

micromatikal
  • 2777 Answers

SOURCE: I have a viewsonic N3235W

Sounds like a failed or at least failing power supply / power board inside the TV. Unfortunately this is a very difficult repair, and unless you are an electrician I would not recommend attempting it. You can test the voltage output from the power supply if you wish... that will show if it is indeed the culprit which I think it is. If you don't want to mess with that you will want to contact a local TV repair person in your area if you are sure this is out of warranty, more on that in a bit here. This is actually the most common problem with this type of TV, I see it every day, it just happens - sometimes with new TVs and sometimes it takes many years for it to happen.

If you think it may still be under warranty please contact the manufacturer to file an RMA. If you happened to purchase the TV with a major credit card (not a debit card) there is a good chance it may still be under the free extended warranty most credit cards place on electronics. Please contact your credit card company to inquire if they do this, and they will be able to file the claim and get you a refund for the TV.

If you want to attempt the repair yourself please let me know and I will get you the part number and a place you can purchase it from for what you need.

So sorry that I don't have better news but it is definitely a power issue internally. Please reply to my answer here with any questions or comments and I can help you for sure...

Thanks
Tim

Posted on Nov 06, 2010

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