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My 2008 toshiba flat screem tv (model#32AV500U)when cut on picture comes on but quickly goes out with only sound remaining

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If an LCD TV like this has sound with no picture (dark screen), that means that the inverter is not turning on. The inverter board is the part that supplies high voltage to the backlight system integrated with the LCD panel. Even if the problem is usually the inverter itself, the PSU and the main controller board must also be tested, as voltage line to inverter is delivered by one of the PSU lines (it works at different voltages), and is controlled by the main board.

Leave power cord disconnected for 15 20 minutes.
If you use a receiver box check the connection cables. Test the TV using different devices and inputs. This may not fix the problem, but it is part of necessary troubleshooting.

If there is sound but no video, then it is either the inverter or the PSU that is failing.

The PSU supplies DC power in different voltages. One of the output will supply power to the inverter, which is connected to the backlight system.
The inverter gets shut down, either because of a fault in the inverter board itself, or because it does not get power from PSU.
With no inverter the display will look completely dark.

Here general explanation of how an LCD can be tested: Testing LCD TV PSU and Inverter.
Here all parts for this set:ShopJimmy - Toshiba 32AV500U



Posted on Nov 22, 2010

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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

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:

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:


Please post back what you find.

Jul 28, 2010 | Toshiba 32AV500U 32 in. LCD HDTV

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

My Toshiba 32AV500U - the picture went blank.

This problem usually happens when the lamp runs out, verify how old is your TV, lamps have a life spend of aprox. 3 years, most likely you would have to replace the bulb so your TV can start running again!!

Mar 17, 2010 | Toshiba 32AV500U 32 in. LCD HDTV

1 Answer

I have a 2008 Toshiba 32AV500U flat-screen television. Last week when I turned it on in the morning the power light came on but I have no picture or sound. I have been looking for a schematic or blog...

i work at cort furniture in kalamazoo mi. as an electronic co. has about 143 of these model ty'sthey rent. i have ran across about ten of these that don't come on. the most common failure is the right inverter board and sometimes it is the main signal board.they have no replacements for these but have to be sent in to a repair be repaired.

Feb 22, 2010 | Toshiba 32AV500U 32 in. LCD HDTV

1 Answer

My Toshiba 32av500u will not show a picture but the sound comes through fine. When i power on the television the picture flashes up,and there is a grinding sound as if a cd were scratching. The picture...

Ur LCD inverter board is dead.Must replaced the board will get ur picture back.The board in the tv usally a long board.Tries, to buy the board part.

Jan 17, 2010 | Toshiba 32AV500U 32 in. LCD HDTV

4 Answers

When I Turn on my toshiba 32AV500U there is sound but no picture

The problem isn't with the lcd panel, its with toshiba not willing to sell the backlight master or slave inverters seperately from the panel. If you check either the master or slave will have a blown 5 amp fuse, ussually 2 or more transistors inline with the transformer will be shorted.

Nov 16, 2008 | Televison & Video

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