Question about Toshiba 32AV500U 32 in. LCD HDTV

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Toshiba 37 lcd tv picture gone sound remains ok looked in back none of the backlighting is lit any ideas.when turned power off heard a pop

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The power supply module will be the first place to look, it may have bad DC filter caps, blown or burnt parts, cold solder joints, etc.
Here is the service manual:
http://elektrotanya.com/?q=showresult&megnev=Toshiba&megnev2=32AV500U%20&kategoria=&kat2=all

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

Please post back what you find.

Posted on Jul 28, 2010

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1 Answer

My screen is dark but the sound is ok


SOUNDS LIKE EITHER THE INVENTER BOARD IS PLAYING UP OR THE POWER SUPPLYBOARD,LOOK FOR FAULTY CAPACITORS.ITS THE BACKLIGHT THAT LETS YOU SEE WHAT IS BEING SHOWN ON THE LCD SCREEN BY LIGHTING IT UP,IF YOU LOOKED CAREFULLY OR SHOWN A TORCH ON IT YOU WOULD SEE THE SCREEN.SOMETIMES IF YOU MANAGE TO TURN THE BACKLIGHT DOWN A BIT BY TURNING DOWN THE BRIGHTNESS ON TV,THE BACKLIGHT WILL COME ON AGAIN,IT IS CUTTING OUT DUE TO LACK OF POWER OR FAULTY CAPACITORS ON THE PSB.DO SOME GOOGLE SEARCHING,GOOD LUCK

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I have a philips 37" flat screen TV, when I switch


hi,
There is problem with the back light of your tv. In LCD tvs CCFL are used as back light to give light to independant pixels. CCLF lamps required high voltage to light. This high voltage is provided by the inverter board inside ths tv. If any one of the chopper transformer (high voltage transformer) have some problem then the inverter will shuts off itself preventing damges to the power supply.

You have to check the 24V from the power supply. If its ok the you have to check the inverter board.if avilabe replace the same. if you are not able to do the same i will prefer to consult some one experienced in it. Back light inverter board will look like one in the picture.
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Aug 03, 2011 | Philips 37PF5321 37 in. HD-Ready LCD...

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Hello, I have an LG LCD TV Model : 37LC2RR-2L, I can get sound on th tv, the screen is on but no image appears.


You're backlight inverter is faulty.

You first need to check your power supply and ensure you have 24v output to the backlight inverter.

If you lack the 24v you will need to replace capacitors in-line to the 24v rail to get power back to your backlight inverter.
Look for these:


If your 24v is OK then you will need a replacement inverter to restore your picture to your tv.



Best of luck!

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Apr 18, 2011 | LG 37LC2RR 37 in. LCD TV

1 Answer

My TV screen appears for a second then turns black, then a few seconds later appears again and the turns black again. The channel sound is perfectly fine. My Cable company tried everthing and it still...


If the tv isn't fully shutting down. but just flashing on and off then it
sounds like a backlight supply fault.
All LCD screens have what can only be described as micro flouro lights inside the screen module.
it is possible that the power supply is faulty causing them to flash on and off every now and then. or the tubes themselves are damaged.
to confirm this..
Lay the tv down flat on its back and power up in a well lit room
get down close to the screen and look across it at a acute angle
now if the black screen looks like it is still displaying an image then it's definatley your backlights!

in which case it could be a simple fault in the power supply.
so if your feeling confident in yourself i can talk you through what to look for in the supply..but try this first and get back to me.

hope this helps,ben :-)

Jan 06, 2011 | Toshiba REGZA 42WLG66 42 in. HD-Ready LCD...

1 Answer

No picutre just black-loud pop when I turned it on


You may have blown parts, look inside and inspect the power supply module and the back light inverter board, I will leave the TV unplugged.
Please see my basic troubleshooting guide:
http://s807.photobucket.com/home/budm/allalbums

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://en.wikipedia.org/wiki/Capacitor_plague
Parts: try www.shopjimmy.com or Ebay

Jun 25, 2010 | Samsung LE37B550A5 37 in. HD-Ready LCD TV

1 Answer

I have a Toshiba 32av500u HD LCD TV.NO picture


Its a backlight problem. Common with this model. Under warranty? If not, then its a service shop repair.

Mar 26, 2010 | Toshiba 32AV500U 32 in. LCD HDTV

1 Answer

Philips 50pf9631d/10 Audio ok but no picture


Bad power supply or backlight inverter.

If the backlight is not turning on, you should be able to see the lcd image by shining a bright flashlight at the screen.

Backlight inverters are loud, so you can hear them operating (high pitched whine) and if the backlight is coming on, you can see white light leaking around the edge of the screen, and even a little inside the cabinet.

Philips are legendary for having power supplies that fail due to bad capacitors, so that could be the culprit as well.

Oct 22, 2009 | Televison & Video

1 Answer

I have sound but no picture??


vague discription , but can help here, is the backlight lit?
if not
shine flashlight on screen and see if any picture is actually there,m if there is a picture there with no backlight, could be a power issue or bad panel (screen).
if no picture but has backlight, may be Tcon board or signal board

Jul 27, 2009 | Samsung LE37B550A5 37 in. HD-Ready LCD TV

1 Answer

The green led is lit, indicating power is on...but no picture


If you are sure all conections are ok, then your mainboard is damaged and will need to be replaced, I recommend you to try the TV with an external video source (like ipod or DVD).

Jul 03, 2009 | Toshiba 37AV500U 37 in. LCD TV

2 Answers

Magnavox 37MF231D 37" LCD TV "popped" now won't turn on at all!


Capacitors tend to pop when they fail. Phillips LCD TVs have lots of problems with capacitor failures in their power supplies. I've got my 37mf231d apart on my workbench as we speak. Mine makes a whistling sound which I believe is either a solder fault or a bad capacitor.

A new power supply board is about $150 for that TV. The gamble, of course, is if the power supply took out something else when it failed.

Jan 16, 2009 | Philips 37MF231D 37 in. LCD Television

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