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Projector tv toshiba 50h71 Fuse F470 is open r243 and r244 just blow nothing seem to be short it's in the ABL circut can it be the flyback??

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  • Master
  • 7,191 Answers

Hi,

Please elaborate your problem providing us with more details and the exact problem.

Thanks for using FixYa.

Posted on May 19, 2010

  • audioshop May 19, 2010

    it's ok I found the problem
    it was the bleu projector picture tube that was short
    anyway, thank you


  • AliTech110
    AliTech110 May 19, 2010

    Many thanks for the reply and feedback.


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1 Answer

Toshiba 50H71 Won't Come On


This could be caused by several different things.. your convergence amplifier ICs could be bad, causing 1 of the 2 pico fuses to open up.. another possibility could be bad solder or defective hybrid voltage regulator to be bad (its usually a light brown color).. worse case could be a cracked picture tube hidden by the deflection coil on 1 of the 3 tubes.. might also wanr to check if the horizontal output transistor is shorted..there is also a 1A pico fuse that could be open..

Dec 22, 2008 | Toshiba 50H71 50" Rear Projection...

Tip

61H70 Common Problems According To Local Repair Shop


No Startup = Check Q404 (2SC5570) and pico fuse F470 (2A)

Dead = Check Q801 (strz4369, 23135015) or replace QA02

Intermittent Reset = Add cotton tape and capacitor (0.47uf) across pin 54 of QA01 and GND (CA61 GND side)

Dead Relay Clicks = Replace zener D878 (9.1V)

HOT Fails Often = Replace C403 (22uf/100V)

Picture Fades Comes Back Blurry = Replace Q510 and Q221

When environment temperature rises above 95 grade F, television goes out of convergence and vertical slowly rises from bottom of screen = Connect capacitor (10pF/50V) between R4013 (Q421 collector) and R4012 (Q421 base). Add insulation tape underneath capacitor as necessary.

Intermittently no blue colour. Distorted lines in picture = Replace Q751 (STK392110)

Rolling picture. No convergence. Red foldover = Replace Q751 (STK392110) and R7726 (1.2R)

No picture. Audio and OSD OK = Check R243 and R244 (22K/0.16W)

Q510 replacement = 2 IC types have been alternately used as Q510.a) TA1316Nb) TA1316AN...The 2 types are not interchangable. When replacement of Q510 is necessary, the original type must be used. Do not use part number listed in the service manual. Use part numbers listed. Q510, type IC: TA1316N - Use P/N: 23000358 Q510, Type IC: TA1316An - Use P/N: 23000584

Dead & Power LED flashes = Check fuse F860 (4A) for O/C, Q801 (STR-Z4369), D862 (NTE552). Also check zener diodes D873 (27V), D875 (9.1V), D877 (27V) and D878 (9.1V).

Hope this helps...Unless you know exactly what is going wrong, sending the chassis to http://www.ptscorp.com would be my advice.

on Jan 22, 2008 | Toshiba 61H70 61" Rear Projection...

1 Answer

Keeps blowing fuse


It has a short circuit somewhere...
Not sure if this is a CRT, LCD or Plasma TV but the two common causes of shorts for CRT's are the Horizontal Output Transistor (HOT) and/or the Flyback Transformer (Could be both). As a general rule if the flyback has visible cracks in the case they should be replaced. It is also a good idea to replace the HOT if you're replacing the flyback as it could be weakened and may not last much longer itself.
Other areas to check for all types would be any Diodes in the Power Supply Circuit. If a diode is open it can cause the fuse to blow. Note that a diode itself will not short, but an open diode can cause a fuse to blow.

Mar 11, 2008 | Panasonic CT-32HL43 32" TV

1 Answer

Tv has died!!!!


Sarahp_21,
Check the 2amp pico fuse at F470 and if open replace it and Q404 2sc5570 the HOT (horizontal output transistor).. If not open check HOT for short EtoB and inspect the solder connections of Q801 in the SMPS.
If any of that sounds greek you need to take it to a shop or find someone handy with a meter and a soldering gun that can do the work for you.
If I can help any further just let me know.
Bill
premtech@willapabay.org

Dec 21, 2007 | Toshiba 40H80 40" Rear Projection...

2 Answers

Toshiba projection tv 50 inch


Need to test F470 and F850 for open.. Simple continuity to see if either fuse is open.. If F 470 is open replace it and C884 and if F850 is open you probably you may need to replace the two convergence amps STK392-110... Large black Ic's screwed on an aluminum heat sink...
Bill

Dec 16, 2007 | Toshiba 50H72 50" Rear Projection...

1 Answer

Tv will not stay on.


Hello....
This problem is related to ABL control .
Trace ABL signal from Pin no 11 of flyback transformer.Mostlikely value for the resistor in abl line has gone high.First case reduse the G2 voltage and see if the unit works for long.
Second case its sure that its ABL problem.

Nov 20, 2007 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Toshiba 50H82 blown fuse f470


Solder jumper wires for prevent maintenance.....on signal
board = 008,010,017,048,600.............................T.

Oct 23, 2007 | Toshiba 50H82 50" Rear Projection...

2 Answers

RCA big screen tv


whenever fuse blows every time it is the indication of short circuit in tv. so please do not put fuse unless you know the cause of blowing fuse. these are the reasons of blowing fuse. 1 main filter cap.short. 2 rectifier diode short. 3 swithing transistor short 4 horizontal output transistor short 5 caps & diodes connected to flyback transformer short. 6 print short. 7 at last if every thing ok then flyback transformer defective. hope this will help. if you are not a tech person call skilled tech to fix it. good luck

Sep 24, 2007 | RCA P60828 TV

1 Answer

FUSE BLOWS EVERTIME I TURN MY TV ON. I CAN REPLACE THE FUSE AND DISCONNECT THE FLYBACK FROM THE CRT,TURN THE SET BACK ON ,CHECK THE FUSE IT WOULD STILL BE GOOD,BUT WHEN I REINSERT THE FLYBACK AND TURN THE...


Possibly a resistor that's becoming defective... it's changing value thus increasing current. like if the resistor has a rating of a 10k Ohm and now it's changing to a 30K Ohm and the current (amps) is supposed to be around .50Amps and now it's rising to .75Amps or higher, so it would blow the fuse so as not to further damage any other high voltage or sensetive component. Is the fuse you are replacing the same as rated for the tv? ie; 250V 1.25Amp FB (fast blow) or SB (slow blow) it should say on the circut board where the fuse plugs into.

Jul 17, 2007 | Zenith C27A24T 27" TV

2 Answers

Blown fuse over and over


you need to solder all the connectors and plugs between the 2 boards

Mar 05, 2007 | Toshiba 42H81 42" Rear Projection...

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