20 Most Recent Toshiba 26AV502U 26 in. LCD HDTV Questions & Answers

Fault to the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. 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 power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

Toshiba 26AV502U... | Answered on May 23, 2015

u need to make a replacement nd wen make sure you identify what made it blow before you substitute it for a new one

Toshiba 26AV502U... | Answered on May 23, 2015

Check and replace the damaged component/s at its main board. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Toshiba 26AV502U... | Answered on Sep 21, 2014

Check its speaker/s first. If found OK, check and replace damaged component/s at its audio output section circuit. Check whether there is picture. With almost all modern TV circuits, there will be no audio, if there is no picture. Keep this in mind.
If you wish to get some details, check the site linked here. Surf the site in "MOSAIC" view. It will make surf easy. Surf the site with patience.

Toshiba 26AV502U... | Answered on Jan 25, 2014

If you are sure the power supply board is dead, replace it

Toshiba 26AV502U... | Answered on Jul 01, 2013

A very dim picture in this case may be damage to the power supply of the set---If a LCD set it may use back lights of some type--if not on or at full brightness the picture will be very dark.

If I was looking at this set I would open and check to see if voltage for the back lights is correct first.

Toshiba 26AV502U... | Answered on Jun 11, 2012

check menu and make sure speakers are not switched off and put your ear to speaker to see if even faint sound can be heard or a buzz.

In menu check the speaker on or off feature and also that the sound is not muted.

A few of these sets also have a feature for internal or external speakers and make sure it is set correctly.

Toshiba 26AV502U... | Answered on Mar 14, 2012

Possible that the back light circuit has failed. It can be fault in the invertor circuit , normally there can be loss of voltage to the circuit , a failed transformer or drive.
you can check on the line voltage and the drive output to confirm.
If this seems okay the fault can be also related to the motherboard which might need assistance so as not to tamper the board with a false move.

Toshiba 26AV502U... | Answered on Oct 31, 2011

Tv still have audio sound after it is turn itself all white on the tv LCD screen panel?Yes.Than this problems it is the tv main tv Tuner signal board it is dying and the causes.That the board,where the tv imcomming broadcasting signal cable wire plug into it.U have some skills,like can do some basic mechanicals works like take things aparts and putting it back together again?Yes.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish tv main tv Tuner signal board for the replacement.

Toshiba 26AV502U... | Answered on Aug 15, 2011

If you are using component cables change them out. It sounds like they're faulty. Try another device like a dvd player on a different input with different cables to see if the picture is still too red or too green. If so then the tv needs servicing. If not you can rule out the television.

Toshiba 26AV502U... | Answered on Aug 14, 2011

Most often, this symptom is a result of a failing POWER SUPPLY but a faulty MAIN BOARD can certainly cause very similar symptoms. Unfortunately, without a donor TV to swap parts with or a dedicated test rig, it can be very difficult to differentiate between these problems.

One way to test this is to remove the rear access panel on the TV and replace the power supply circuit board with a new one, since this is the most often the source of the trouble.

You can usually find replacement supply circuit boards on Ebay by searching for your TV's model number. Unfortunately, I did not see any power supply boards for your model currently available, although the online inventory selection does change daily so you can always keep looking.

Here is a link to a replacement MAIN BOARD for your TV currently available on Ebay for about $85 US plus shipping:


Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information and items at the website indicated.

The repair / replacement procedure is not extremely difficult if you have some basic electrical safety knowledge and some basic electronics / mechanical repair skills.

You will need to unplug the power cord from the unit, lay the TV screen side down on something soft and flat like a bed, and then remove the rear access panel or the entire rear cover as required in order to access the circuit boards inside.

When you remove the rear cover and access the circuit boards inside, just check the part number that is printed right on your circuit boards and confirm that they exactly match the ones provided in the Ebay listings. Also make sure that any part you order is labelled "TESTED WORKING" in the condition description. Any part with a condition description of "AS IS" is probably faulty itself as well.

Then unclip and remove the various electrical wire connectors leading to the power supply circuit boards. Then remove the screws securing the circuit board to the TV frame and then remove the power supply circuit board. Be sure to avoid touching any large capacitors on the circuit board which can retain a nasty charge even after the unit is unplugged.

Then just screw in the new circuit board and connect all the wire bundles to their appropriate connectors on the new circuit board and then replace the rear cover. Then plug in the power cord and test.

Here is a link to another Expert's solution to a similar problem which includes links to his excellent and informative set of LCD TV / MONITOR TROUBLESHOOTING GUIDES:


These guides will give you some idea of the various problems with LCD monitors and the associated repair procedures.

If you choose to rate BUDMRTN's troubleshooting tips by clicking on the YES THIS WAS HELPFUL icon on his solution page at the above link, then I thank you very much for your time and consideration.

Please comment back here to this page if you have any details to add, have any questions, have difficulty with the links, or just require further general assistance and I will respond as soon as I see it.

I hope that was helpful to you, good luck.


Toshiba 26AV502U... | Answered on Aug 10, 2011

Not finding what you are looking for?
Toshiba 26AV502U 26 in. LCD HDTV Logo

52 questions posted

Ask a Question

Usually answered in minutes!

Top Toshiba Televison & Video Experts

The Knight
The Knight

Level 3 Expert

76237 Answers

matt martin
matt martin

Level 3 Expert

1257 Answers

Cindy Wells

Level 3 Expert

6073 Answers

Are you a Toshiba Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

Toshiba Televison & Video

  • Toshiba Televison & Video

Most Popular Question

toshiba 26

  • Televison & Video