Question about Projection Televisions

1 Answer

Toshiba 32A43 . After power surge, I replaced a fuse that I found blown on the circuit board. That did not fix it. Anything else I can check ? I got it for free, so if there is nothing else I can do , I'll just throw it away.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 6 Answers

A power surge will have blown th LOPTX and possibly shorted the PCB. it wont be worth repairing this set.

Posted on Aug 05, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I push power on, tv does not turn on.


The reasons can be many for a power failure, but check on:

1. start by checking the continuity from the plug to the main board.
2.Check the fuse on themain board, if fuse is blown check for shorted circuit. check on surge protector, rectifier, filter capacitor or the SM driver.
3. If the SM is not working then the oscillator IC can be faulty.
4. if the SM power supply works but the main board does not , check voltage to all circuits. check for pico fuses being open.
5. The microprocessor must work on the man board. if so the trigger or indiccation LED will light up.
If no trigger check mP then the drive stages of the projector.
Hope you follow on this advice.

Aug 26, 2010 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Toshiba 62hm94 pluged in but getting no power at all. No green or red light on.


Hi:
CHeck for open line fuse you may of had a surge that blew the fuse especially when there is no power indication at all. IF no fuses are blown on the power supply then suspect a faulty power supply circuit.

Aug 24, 2010 | Toshiba TheaterWide 62HM94 62" Rear...

1 Answer

Hello, I have been having power problems with my Samsung FPT5084 50" plasma for the past year. I know what the problem is,m just don't know how to fix it. My TV keeps blowing fuses. I bought 10 12A 250V...


I would have maintenance from your building come out or the electric company and put a monitor on the 110v line into your apartment to make sure the ground strap is not coming loose in which your voltage will rise in excess of 150 volts.
As far as I see, your AC line fuse is only a 6 amp. Why are you using a 12 amp? If you have a circuit board ID number of the fuse your replacing, that would be helpful. I know of no Plasma set that uses a 12 amp fuse, not even old heavy current draw sets of yester year. You can e-mail me at jmk2938@gmail.com

Nov 28, 2009 | Projection Televisions

1 Answer

Hitachi 50GX30B 50 in. Rear Projection...tv won't turn on since electricity went off & on


I have worked on several of this model for power surge damage. Usually what I find is a blown fuse, a shorted regulator i.c. and possibly a blown bridge rectifier(diode array). On rare occasions you can solve this problem by replacing only the fuse, but if the fuse blows when you plug the set in, you will more than likely find above mentioned parts have failed. The best thing to do is to call a repairman but if you have an ohm meter you can test it yourself:1.Unplug set and remove rear cover.2.Get spotlight and look closely at where power cord connects to circuit board.Small glass fuse will appear black if open usually.Otherwise,test for continuity, or just replace it.3.After replacing fuse plug power cord back in while looking at fuse.If you see an instant flash, fuse blew again meaning you will need to obtain parts in power supply and solder work will be required. That is probably as far as I can take this other than saying that you might first want to look at underside of circuit board to determine if major surge damage has occurred. If it has you will immediately know because it will have burn marks all around a/c power supply. I hope this helps, Russmann.

Apr 28, 2009 | Hitachi 50GX30B 50". Rear Projection...

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...

2 Answers

After power surge my tv (toshiba 52') will not power on


after a power surge if you dont have in on a surge protector it probably fried the main board in the tv so it wont work anymore..woudl probably be cheaper to buy a new tv than to try to repair the one you have now

Dec 15, 2008 | Toshiba 57H93 57" Rear Projection HDTV

1 Answer

Toshiba 50H72 problem plz help!


ok well both of you have had the same problem i did... to fix the picture problem check the circuit board pd0074 its the yellowish looking one next to the green one which has the ic's on them... ok on the pd0074 board look for fuses f470, f850, and the f851 to see if they are blown the f470 is what turns the tv on and the f850 and f851 are what protect the convergence ic's chances are they are blown.... the sound i don't know how to fix that problem but i would check all the fuses on that board to find out if one more is blown that what i did but the only thing is that i could get the actually fuses for the tv i was told by a tv repairman in my town to just take 2 wires sodder them on to the fuse and take a glass fuse and put electrical tape around them and it worked like a charm... so i hope this helps you.... the most i spent was 30 dollars for the ic's and the fuses all together and i was quoted at 450 to do what i did myself

Oct 31, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

Toshiba 50H81 Has Power but No picture or Audio


ok i'm goin to need more info about your problem. you stated fuses and didn't say the location numbers of the fuses. Also, have you rechecked your fuses to see if they are all still good? 3 fuses sounds like more then one problem. once you tell us your loc#'s of your fuses, we can look into your problems.

Apr 07, 2008 | Toshiba 50H81 50" Rear Projection...

2 Answers

No video, Blown fuse f470, audio works great.


check your h uot transistorthen check pico fuses

May 26, 2007 | Toshiba 50HX70 50" Rear Projection...

Not finding what you are looking for?
Projection Televisions Logo

Related Topics:

51 people viewed this question

Ask a Question

Usually answered in minutes!

Top Projection Televisions Experts

Jaime Hernandez

Level 3 Expert

2267 Answers

matt martin
matt martin

Level 3 Expert

1191 Answers

yadayada
yadayada

Level 3 Expert

60541 Answers

Are you a Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...