Question about Toshiba 19A25 19" TV

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Broplem there is no picture on tv but the sound is ok and whene i hit the line transformer the picture comes on for a while then its gone againe aii other fanction work allright

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Re: broplem

I beleive the problem of your TV is the horizontal circuit probably cold solder. if you have soldering equipment, try to resolder the circuit. but if you don't know anything about this, i suggest you bring it to a qualified person.

Posted on Jan 14, 2007

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How to fix problem of jvc crt tv model av-21l31 power ok no video/audio no display with lines coming from flayback

Look at the horizontal output transistor then the fly back transformer.Check ALL the voltages coming from the power supply. One or more of them have to be missing for the audio and video to be gone at the same time.

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2 Answers

No picture displaying but sound coming through ok

Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts.

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1 Answer

Hi I have a very annoying, ear piercing high frequency pitch coming from what seems to be the television. However, I was trouble shooting and based on the cable technicians thought; said to be the...

The LOT [Line Output Transformer] of your TV has damaged. It is the one, that supply all the voltaged needed to CRT. Its internal windings will get shorted in between, and is irreparable. Replacement is the only remedy to this proble. Replace the horizontal output transistor also with this. you haven't specified whether there is picture with your tV or not. If this high frequency sound is along with picture, there is some loose in the cores of the SMPS transformer, or LOT itsef. If there is no picture at all, and this high frequency sound is there, no doubt; LOT is damaged. OK.

May 22, 2011 | JVC TM-2703SU 27" TV

1 Answer

Picture on screen has gone to only 1/4 of screen with strong line through picture.

This sounds like the OPT or LOPT has blown or weak ( OPT = Line output transistor. LOPT = Line output transformer.)
This job should only be carried out by a professional engineer. I would take it to your local TV repair person. Hope this helps.

Apr 13, 2011 | Sansui Standard (CRT) Televisions

1 Answer

Good sound, picture is flat lined. suspect flyback transformer.

Check for 28volts coming out of the flyback through resistor and rectifier , if it is there then you may want to look at the vertical output i.c , it may be gone or cold soldered which is common in those sets.

Nov 01, 2009 | Sanyo DS27930 27" TV

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How to fix Telefunken tv mp162m'

i found out in my in dept probing around the line output transformer has gone so no tv it is to get recycled

Feb 14, 2009 | Apex Digital PF2020 20" TV

1 Answer

My tv has no picture or sound. it makes a sound like its about toi come on but it doesn't. a red light just flashes

The Horizontal Output transistor needs to be changed as it is most likely shorted. The current transistor on this set is a 2SD3402 (no longer available) it's new replacement part number is the 2SC5902.
Order 2 2SC5902 Horiz Output transistors.Replace the transistor by it self once and if all is ok then fine.
If not replace it again and also the the Flyback HV transformer. The HOT transistor is probably shorted again and the transformer is causing it.

Dec 21, 2008 | RCA 32V550T 32" TV

1 Answer

H.V shuts down/

try to check a bad conections in hv transformer and capacitor around them

Feb 01, 2008 | Zenith B27A11Z 27" TV

1 Answer

TV working, then suddenly no picture, no sound

could be flyback transformer cracked need replaced 48.00 for part or board replacement usually done at about $200.00 , part number is 9-2022

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1 Answer

No picture but sound ok


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