Question about Toshiba 26AV502U 26 in. LCD HDTV

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Toshiba 26av520u replaced blown fuse by power supply. new fuse blows immediatly when plugging in

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Ty for ur time

Posted on May 23, 2015

  • ed long
    ed long May 23, 2015

    very small bulge in 1 cap 35v alsocarli250v can this be blown yellow cove on it

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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.
http://electronicshelponline.blogspot.com/
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.

Posted on May 23, 2015

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2 Answers

Toshiba tv fuse blown


most electronic applications use what is known as a "slow blow" fuse and they are available fro electronic spares shops (JAYCAR and the like ) however if the fuse blows , you have a much bigger problem so take it to a repair shop and have the problem properly diagnosed

Feb 28, 2016 | Toshiba Televison & Video

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Toshiba Tv won't turn on


if the power light doesnt come on chances are a shorted component on the power supply has blown the fuse. If so replacing the fuse will most likley only result in the fuse blowing again. Replacing the power supply would be the best bet. You can get one from www.tvcircuitboards.com

Dec 23, 2012 | Toshiba Televison & Video

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TV blew fuse. Replaced with 125v 5 amp from a 33 inch Toshiba that has gone bad. The 5 amp also blew. Purchased new 4 amp fast blow fuse for unit, now nothing happens, i.e., no blown fuse, no circuit...


replacing the fuses with random values is prolly not a good thing...but one thing to check is a big transistor know as the HOT. This will more than likely be clipped or screwed to a heat sink NEAR the flyback (big transformer, has a wire going into the big glass tube). That causes fuses to blow...If this does not work, let me know.

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Black screen no video no audio suddenly now


This set is a 50" plasma. first check the AC power fuse on the filter board then: if it is bad: check the power supply by marking and, removing all the cables; (so you can put them back in the correct spot) except the filter board to power supply cable; that connects to the Power supply board. Then: replace the blown AC fuse and, re-power: If the power supply blows the fuse: again, the power supply is bad and, must be replaced or, repaired. If the fuse does not blow: turn off the set then: on again, reconnecting and, disconnecting each board cable in turn, untill the fuse blows again this cable leads to the bad board; replace or, repair the board that blows the AC fuse every time the bad board is connected, irregardless of which other cable to the power supply may be connected also; or, not.

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1 Answer

When I plug the unit in and try to turn it on, nothing happens. toshiba sd-3980 dvd player


The internal fuse is blown.

It may be a replaceble glass cartridge fuse, or a fuse soldered to the power board.

Unplug, remove top cover, check and replace fuse. Radio Shack has reasonable coverage of fuses.

But - fuses usually blow for a reason. It could have been a power surge; it could be an internal failure. If the new fuse blows, it needs professional replair. Many of these are so cheap to make that it doesn't pay to repair them - replace it if the repair estimate is over 1/2 the replacement cost.

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3 Answers

Toshiba 57H81 Flashing Red Power Light, Blown Fused F850+F852


Solved by resoldering some solder joints!!!!!!!
********
Toshiba Model 57H81 Rear Projection TV - Purchased 11-09-2001

Problem: Toshiba 57H81 Flashing Red Power Light, No Picture/Sound, Blown Fuses F850 + F852

Symptoms January, 2009:

  • Upon turning on set I got flashing red power light and nothing else.
  • Removing plug for one minute and plugging in results in:
    • Audible click, steady red power light for 2 seconds then slow flashing red light
    • Pushing power button results in steady red for about 2 seconds then slow flashing red light, no other set activity
  • Removing power cord for several hours and plugging back in made no change
    • Audible click, steady red for about 2 seconds then slow flashing red light
  • Possible related note: Over past several months occasionally the entire screen would flicker momentarily and at other times be problem free for weeks.
  • Fuses F850 and F852 found blown

Repairs Made:
  • PD0074 DEF/CON Power Board
    • There are two main power supply capacitors in this set. They are C-809 and C-810. One their negative lead on the printed circuit board re-soldered leads and nearby contacts. I’m told that because the factory left out a printed circuit board eyelet, the connection will come loose over time. When I called Toshiba customer service they said there was a known solder joint problem causing blinking red light.
    • Replaced blown fuses F850 and F852.
      • I actually installed a fuse panel on the inside of the cabinet and routed the fuse connections here instead of ordering the special fuses and replacing them on the circuit board.
      • Had to use a 5 Amp SLO-BLOW for F850. Fast blow does not survive power up. Get the red blinking light.
      • Used a fast blow 2 Amp for F852.
  • PD0073 SIGNAL Board
    • Re-soldered Q751 + Q752 STK392-110 Convergence Amps
    • Re-soldered adjacent pads that looks suspicious

Total Cost to Repair about $10
  • Twelve hours of my time over three days to research issue, disassemble set, make repairs, add fuse panel.
  • Already owned Service Manual and Circuit diagrams from a different 2004 repair.
  • Less than ten dollars at Radio Shack for fuses and fuse panel. Already had wires, etc.
  • Some solder. Already owned de-soldering tools, etc.
  • Visited both local authorized Toshiba factory service repair facilities. One said repair would have to include replacing Q751 + Q752 STK392-110 Convergence Amps with ST392-180, and realigning set for a total of $500+ and it would be more if they had to order a power board. NO THANK YOU! Other shop said $65 for site visit and $30 to make an estimate that could be applied to repair.

Jan 04, 2009 | Toshiba 57H81 57" Rear Projection...

1 Answer

Westinghouse LTV-32w1 LCD will no power on.


Fuses have NO polarity. Stop messing with things like this before you hurt yourself. The power supply uses and creates voltages that can HURT you. Anytime a 3 amp fuse blows immediatly, there is a major problem, best left to professionals. Clarkson TV & Appliance Repair

Aug 05, 2008 | Westinghouse LTV-32w1 32 in. HD-Ready LCD...

1 Answer

Toshiba TP61E80 blows fuse


Blows AC fuse on plug-in is a direct short in power supply...
check components with ohmmeter to find short....Check MOV
across AC line by measuring across AC fuse clip.......T.

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2 Answers

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These are switch mode power supplies and very difficult to repair. If you don't find all the blown components, they just blow up again when you try it. If that model has a separate module for the supply, you can try and order a replacement, but they usually are too expensive.
What model is it? Maybe I have a junker I can take the supply from for you?

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1 Answer

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The reason why fuses blow is that the current is too much. Is the fuse rating according to the specs ? If yes then ... One or more output power transistor (or audio power IC) may be shorted. have it checked before replacing another fuse as this might cause more damage.

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