Question about Philips 20DV6942 20 in. TV/DVD Combo

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Blown or damaged transistor

How do I repair the damaged or blown transistor. Can I repair this myself? Should I have a tv repair place do it for me?

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Re: blown or damaged transistor

I recommend to you to take it to a center of service, since sometimes there are damaged more parts than those who see seen wing although if you himself want to do it then, that I number of part is to give you another suggestion of the possible parts that are damaged

Posted on Mar 01, 2008

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I have a Toshiba 34HF85, watching it this morning there was a electric buzzing sound and it went off. There is no LED lite in the front, and I can not turn it on. I unplugged it and waited 1...


from your description is about the shorted LOT. LOT or Line Output Transformer, is a stepup transformer, looks like a black cylindrical mass from which normally three wires comes out and one amoung them will be fitted to the top of the picture tube, and the other two's will be connected to it base card. if this transofrmer shorts, there will be no power light and no picture or sound. It is a main and crictcial component in your TV. It can be replaced. But should be replaced with same type and number. you must open your Tv to resolder it out from the circuit board and to solder a new one in place. You must have a concept of soldering and some knowledge in electronics. along with LOY the horizontal output transistor also must be replaced. it is small component with three terminals, can be lcoated very near to the above said LOT, screwed on to a metal heatsink. Jusr replace this transistor first before replacing the LOT. In rare cases, if this transistor gets a leak , the problem you described here will arise. So first buy and replace the transistor. After replacing it, just switch on your TV for a short time, say 10 seconds or so, switch it off and feel if the replaced transistor overheats or not. it may get slight warm, but should not overheat. if overheats, it is clear that LOT has got damaged, and should be replaced. OK.

Mar 19, 2011 | Toshiba Combination Televisions

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Television does not turn on, no stand by light

Hi you will probably find it very difficult to get the parts for that make of telly did the repair shop look inside the telly or did they just turn you away when they see what make it was.
The problem your having could be one of a couple of things.
The first thing to check would be the internal fuse only check this if you have nothing at all coming on not even the standby light.
If the standby lights on then the fault would be in the high voltage part of the board.
I have looked everywhere for the schematics for your telly and have been unable to locate one on line.
The place to start looking for the problem if you are able to look yourself but only do this if you ahev some experiance in this kind of thing else you could damage the telly further.
If the fuse is blown you could change this first but if it is blown you need to find out what has caused it to blow.
You will probably find that it could be the power relay transformer that the power lead goes into inside the telly this is the most likely problem because if this was fine then you would at least have the standby light on as you dont then it probably is this.
It could even be a resistor or transistor around this part that has gone these will also need testing but without schematics you would be guessing so that would be the first thing to do is locate schematics i have looked and not found any yet but will keep looking for you will let you know.
As for parts if you can get the part number off the part thats gone then you might be able to source one using search engine but you will need to get the part number, this would be on schematics also.
If you arenot able to repair this yourself but can get the part number and source the parts yourself then repair shop should fit them for you.
Ill have another look now for schematics and also see if i can source any parts for your make and model ill get back to you soon ok

Jan 28, 2008 | Mintek DTV-263 26 in. TV/DVD Combo

1 Answer

Toshiba tv mw27f11c horizontal line, no picture

in most cases flyback transformator or vertical drive transistor blown. contact your local electronics service or if needed text me here under your topic for further help.

Feb 26, 2011 | Toshiba Combination Televisions

1 Answer

Turned tv on and it has no picture but sound works fine

This problem is due to loss of high voltage in your tv. Without it the CRTs won't power up and hence there will be no picture. Most common causes of this problem are damaged flyback, HOT(Horizontal output transistor) and/or Horizontal/Vertical deflection circuit. If you have prior experience in handling high voltage electronics I can guide you with the repair. Otherwise its best left to a tech. 30,000V is not to be messed with.

Jan 27, 2011 | RCA D52W135D 52 in. TV/DVD Combo

1 Answer

Screen Doesn't Appear, power comes on but NO Picture,pls help

There are several possibilities that come to my mind about this problem.

Firstly, most problems come down to power, or rather a lack of - because of a component breakdown.

1]...It may sound obvious, but there could be a problem with the unit's internal power supply module that regulates the supply to the HT (High Tension) side of the circuit; It could be
a]...a transistor;
c] resistor;
d]...Or, but unlikely, a fuse.

this is the part of the main board that contains the line output transistors, line output transformer (LOPT) etc, & supplies the extremely high voltage (typically thousands of volts) to the crt (Cathode Ray Tube).

2]...It could be the line output transistor, or another component - such as a safety resistor - in the line out stage.
The line output transistor would be located on the heatsink, very close to the LOPT.

3]...It could also be the line output transformer;
a]...My first check for this would be for dry solder joints on the LOPT, on the underside of the main board.

I must stress, as a retired tv engineer myself, there are very dangerous voltages inside television sets, & I talk from experience - I've had some nasty shocks in my time, & it only takes a few milliamps of current to kill you, if it goes through your chest (Up one arm & down the other).

Even after a tv has been unplugged from the power socket, on the wall, it can contain dangerously high & possibly fatal voltages.

So please, DO NOT attempt this repair yourself, unless you are qualified to do so; either ask someone who you know, who is qualified, or take it to the tv repair shop.

I hope this has been of help to you.


Oct 01, 2010 | Combination Televisions

1 Answer

My tv toshiba md13p1 combo tv is not working. when i plug in makes a noise like a bee buzz. the only way to turned off is to much it cost to repair?

That buzz sound most probably are from axed horizontal output transistor. If your tv is a CRT type. Some other reason for that are faulty regulator, and diode on flyback side, or the expensive one is the flyback itself.

If age is the reason transistor can be replaced as soon maybe thirty minutes. Please get a quote and estimate first to calculate if new tv is more ideal than having it repaired.

Oct 05, 2009 | Toshiba MD13P1 13 in. TV/DVD Combo

2 Answers

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1 Answer

No sound

look if you have a DVD or VCR use its receiver! so plug your antenna into the eg:DVD/VCR then connect its audio outs(red)(white) to the tv's (AV)in area. then plug its image out (yellow) to the tv AV in. then switch the tv on, flip ova to AV then tune the VCR/DVD and volla, sound :) good luck. P.S. this is a blown or damaged transistor(FET)(MOSFET) but is easy to fix if you want to, however it will not undermine the rest of the TV as fas as performance or life expectancy goes.

Oct 09, 2007 | Philips 20DV6942 20 in. TV/DVD Combo

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