Question about Toshiba 55G300U TV

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I have 2010 Toshiba 55G300U tv and the screen is now flashing from picture blank screen then back to picture then it will go to a blank screen permanently after about 30 seconds, what do you think?

Posted by Anonymous on

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  • 2 Answers

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Posted on Jan 02, 2017

romsky79
  • 822 Answers

SOURCE: I have a 32

i know your problem. its an inverter loose connection from CCFL to inverter output. back of your LCD inside the TV. try to remove and re-connect again. be sure no power and AC is unplugged. romsky79@yahoo.com

Posted on May 28, 2009

  • 21 Answers

SOURCE: Screen goes blank, audio still works

I had this problem on my 42" Philips. Just got it yesterday and worked fine on the tv stand. As soon as I mounted the TV to the wall via wall mount system, I had the exact same issue you did. Figured it out today.

The wall mount was putting pressure against the center of the back of the tv (tv set had a slightly rounded back plate, and the mount was a flat plate). As soon as I put spacers (part of the wall mount hardware set) between the wall mount braket and the tv so there was no contact except at the mounting holes, the tv worked fine.

My theory is the pressure pushed the tv back plate against some board components which caused them to overheat (no air flow); or put pressure on internal connectors. I dont know.

Hope this helps, may not apply to your situation.

Posted on Sep 18, 2009

  • 4 Answers

SOURCE: toshiba 55g300u LCD, tried to upload firmware from

I havea Sony bravia, and was explicitly told if the power is off during update I shouldlook for a authorized service. It is too complicated to fix. But watchout, it might not be "under terms of guarantee". Don't know if this applies forToshiba, but just to let you know

Posted on Nov 17, 2010

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Apparently power is getting to your TV but the internal power supply has failed

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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://electronicshelponline.blogspot.com/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should be troubles hooted. Contact any service technician. The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

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1 Answer

No picture but I do have sound on a 55G300U


You might want to checked for bulged electrolytic caps on the power supply, that need changed or just replace the power supply module. Another thing that you can try, is to unplug the set from the wall for 40 Min, the video processor IC, could be locked up and that will reset it back to normal.

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I havea Sony bravia, and was explicitly told if the power is off during update I shouldlook for a authorized service. It is too complicated to fix. But watchout, it might not be "under terms of guarantee". Don't know if this applies forToshiba, but just to let you know

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Try unplugging for 36 hours. I had the same problem but with no sound and picture

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If your set all of a sudden won't come on, e.g., the screen is blank, but the LED on the under the screen next to the on/off switch keeps flashing, then there may be an internal fault on the set that needs to be reset.
To force the reset, try this:
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  • Replug and see if the video returns
Whenever the set senses an internal fault through its monitoring circuitry, it essentially shuts down the set. The flashing LED provides the indication that a fault has been detected. Removing power to the set resets the monitoring circuitry. When plugged back in, the circuitry again does a check of the system. If it finds that there truly is a problem, then the set is shut down and the LED will again flash. In this case, you need to call a service tech. Most of the time, however, the unplug/replug routine is enough to get the set up and running.

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