Question about Projection Televisions

1 Answer

Fuse on circut board blows when replaced each time power switched on.

Posted by on

  • k-payne2 Oct 20, 2008

    would the fault be in the main circit board,or could it be anywhere?would a t.v. repair man easly find this fault.

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 414 Answers

You have a fault on the circit board, you need to identify the faulty component and replace it or call a tv repair man.

Posted on Oct 19, 2008

  • ashburton Oct 20, 2008

    Yes, the fault could be anywhere but a competent repair man should be able to locate the fault fairly easily.

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Will not power on


hello,
A blown fuse is a very common type of fault due to poor design very often triggered by power surges due to outages or lightning storms. However, the most likely parts to short are easily tested, usually in-circuit, with an ohmmeter and then easily removed to confirm.

Note that it *may be* useful to replace a fuse the *first* time it blows (though it would be better to do some basic checks for shorted components first as there is a small chance that having a fuse blow the second time could result in additional damage which would further complicate the troubleshooting process). However, if the new one blows, there is a real problem.
Normal 0 false false false MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Ur power supply board is dead, u know basic electronics’ and soldering? Most of the times, the power suppply board just have dead leakages gases capacitors.These capacitors alway bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get ur tv power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole rerfurbish power supply board for the replacement.

May 24, 2010 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

Blowing fuses p50830bl


the board mounted overtop the of the chasis is the convergence power supply board
replace that board will bring your tv back to life
then go into menu readjust convergence red and blue DO NOT MOVE GREEN

Sep 01, 2009 | RCA P50830BL 50" Rear Projection...

1 Answer

Pioneer SD533HD5 repair, blown STK's or bad power assy?


Go back recheck everything 6amp fuse in middle of power supply board that will blow, also solder everything that looks like poor connection pioneer always has a lot of cold solder jionts.CK all pico fuses they are green,yellow look like resistors but are fuses.

Jun 15, 2009 | Pioneer SD-533HD5 53" Rear Projection HDTV

2 Answers

I have a Toshiba 61H71 that keeps blowing F850. It was just sitting there the first time it did it. I didn't have a replacement fuse so I temporarly replaced it with a 3A glass barrel type fuse. This...


Resolder jumpers on signal PCB..May be near convergence IC circuit..on 50" model they are 050 & 010. You may have solder cracks..I repaired a 50" toshiba..Let me know if this fixes

Apr 15, 2009 | Toshiba 61H71 61" 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...

5 Answers

Panasonic TH-42PX600U plasma TV. No power at all. Where is the fuse (if any)?


I'm having the exact same problem. My Panasonic 42 inch TH-42PX60U just turned off while I was watching TV. I removed the fuses (both were blown) and replaced them and am now getting the red light that blinks ten times.

What should I do now???

Thanks!
Abbie

abbie.bejrowski@gmail.com

Nov 10, 2008 | Projection Televisions

1 Answer

Blowing fuse on convergence board


in replacing the fl231. you need to resolder the connections on the flyback. see tips and tricks under my profile

Sep 23, 2008 | RCA R52WH73 Projection Television

1 Answer

RCA P60752EB Power problem


Apparently, blown fuses indicate problems elsewhere in the circuit. The block is a voltage dropping resistor, has nothing to do with problem. If you think it's worth it, take to pro/tech

Apr 07, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Power cuts off Pioneer SD-P50A5-K about 9 years old


Probably started as a bad solder connection but if it's blowing fuse FU106 now, you're probably in for a new set as that usually means your convergence IC's are bad along with a pair of darlington transistors that's mounted to the heatsink nearby. With the age of the set it may not be worth the trouble. If no fuses are blowing, you could still have a bad solder connection near the Switched Mode Power supply transformer. If that isn't it, you could have a bad High Voltage Block and you may end up having to replace the deflection board as well thank you Pioneer.

Feb 02, 2008 | Pioneer SD-P50A5-K 50" Rear Projection...

Not finding what you are looking for?
Projection Televisions Logo

Related Topics:

41 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

60667 Answers

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

Answer questions

Manuals & User Guides

Loading...