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I have a unbranded tv set. ive got a busted horizontal out put. if i disconnect the collector of the H-out the B+ line has a voltage reading of 300 volts DC. if i connect the collector of the h-out to

Tv is totally deadset

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  • 124 Answers

Use 100 watt gls lamp in h out check with analog meter
+b is 110 volt if high check smps

Posted on Apr 29, 2014

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6ya6ya
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Posted on Jan 02, 2017

premtech
  • 934 Answers

SOURCE: dead set, HOT transistor keeps shorting

It's the copper coiled magnet on the neck of the crt closest to the front of the tube.

Posted on Dec 21, 2008

techman
  • 3130 Answers

SOURCE: T.V. wont turn on

But my freind, If the set had a cold and hot chassis, it could be he is not measuring the voltage from the cold ground and therfore would be a normal reading?

Posted on Oct 10, 2006

likha
  • 790 Answers

SOURCE: television

Hi

ang voltage ng HOT 90 to 120 Volts. kapag standby power yan ay 90 volts japag nag oscillate ang HOT power yan ay tataas ng 120volts Psi. Technician kaba?

Thanks
Likha!

Posted on Sep 26, 2008

SOURCE: always damage the horizontal output transistor..if

Check the Line Output transformer and associated circuitry.for a short.

Posted on Jan 26, 2010

  • 6 Answers

SOURCE: Panasonic TV EVO 51 chassis TNP4G073

try ic801 SE090 regulator on secondary of power-suply

Posted on Apr 20, 2011

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1 Answer

A sansui tv switches on and off by itself. What could the problem?


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 the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Desolder out the horizontal output transistor, and now power on the set. If the set now powers ON, replace the horizontal output transistor. It is faulty. [Collector to emitter or collector to base leak]

Jun 26, 2015 | Sansui Televison & Video

1 Answer

Tv fault finding


I assume you might have post this problem under CRT based TV; and not with Flat Panel TVs. Anyway let me post a solution to this. The first thing you have to do is, to solder all the four connections to deflection yoke. It's a must. Never allow any loose contact with these connections. It might lead more troubles. Never switch ON the set, without soldering these connections well.
Then comes, the case of raster. If there is only a blue raster, with horizontal lines, as you describe here, it should be the fault with its video output stage circuit itself, provided CRT is good. If the horizontal lines displays at equal space, that is, at about an inch space, all around the screen [white thin lines], and are some what parallel to each other, check the voltage at the blue cathode of the CRT base. If this voltage is very less than the other two cathodes, check the blue video output transistor's collector voltage. Check the transistor for collector-emitter leak. Replace it. Check its collector voltage. If found very low, check and replace the load resistor connected to it collector to video output supply voltage [180VDC].
I think you to be somewhat sound in elelctronics, and is why I spend some time to place this solution here. For more information go to http://electronicshelponline.blogspot.com/. Pull up older posts. Hopes it will help you. Good luck.

Nov 28, 2013 | Televison & Video

1 Answer

My rca, when started, the sound come on but not the picture


Hello

Either your RCA tvs horizontal oscillator section or it LOT [Line Output Transistor} has some trouble. You just open your TV and check the voltage at the LOT pin. It should be around 112VDC or so. Check the voltage at its line drive transformer also. It is a small transformer diretly soldered on to the main board, and can be located very close to the above said LOT. Check voltage at its primay side , and if you have a digital multimeter capable of measuring frequency, check the frequency at this point. It should come around 15500Hz or so, without video signal. As far as sond is OK, all othere sections, ie video IF, Tuner Audio output and so, are working properly, only horizontal output is not. Check the horizontal output transistor, which drives the LOT, can be located very near to the LOT screwed onto a metal heatsink. If it collector to emitter or collector to base junction has some leak, it won't work properly, LOT will not work, and there will be no EHT [Extra High Tension], and will be no screen at all. Check these. If you wants anymore asistance from me, get me through Fixya. The fault with your TV is no horizontal sweep. OK.

Jan 08, 2011 | RCA F27442 27" TV

1 Answer

Tv will not turn on. I have unplugged it and tried another outlet but still will not turn on. There is power going through the Tv. Any thought on what it could be


check your b+ first. if your tv has no 125 volts your tv will not turn on check your horizontal transistor located in the side of the flyback transformer unsolder the collector then try to power on your tv check your high voltage at the collector without the collector of the horizontal transistor.

Dec 22, 2010 | Akai CF2791 27" TV

1 Answer

My 36xbr800 blinks six times then pauses then blinks six times, this is repeated......


Check the voltage input to horizontal output transformer [LOT]. Check the voltage at the collector point of the line drive transistor. If the line drive transformer primary gets open this type of fault mau occur. Also check the frequency ant the collector point of line drive transistor and the base point of line output transistor. It should be aroung 15625 Hz.
Check and replace the horizontal output transistor if needy. Replacing it is better. The horizontal output is not working or a short in secondary power supply of SMPS or lot secondary, is your problem

Oct 14, 2010 | Sony FD Trinitron WEGA KV-36XBR800 36" TV

1 Answer

Red power light on chirping beeping sound


Hello miko_alexand,

That problem indicates that the Horizontal Output Transistor (HOT)is beginning to malfunction. I would suggest that if you have a background in electronics that you do the following:

1) unplug and open the back of the set

2) look for the HOT and locate the Collector, Base and Emitter of the transistor and using your multimeter set to read resistance measure from the collector to the ground, it should read high almost infinite, red from base to ground it should read low and from emitter to ground it should read low.

3) if the HOT when read from the collector to ground reads low then you can bet that the HOT has a short circuit from collector to ground, and will have to be replaced.

4) In addition I would also perform a ring test on the Integrated High Voltage Transformer (IHVT).

This will tell you if the IHVT has suffered any damage from the HOT malfunctioning. You may end up having to replace both of the components.

If you do not have a background in electronics I would suggest that you take the TV to your local TV repair facility.

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Feb 20, 2009 | Philips 55PP9352 55" Projection Television

1 Answer

Hyundai 14" colored tv no power


if the final flyback is ok ,then check the driver transistor and the voltage in his collector .Probably the flyback transformer is ok.please reply.

Oct 17, 2008 | Sharp 25R-S100 25" TV

1 Answer

21PT3324/71 Philips TV wont stay on


Try this: On the flyback transformer, raise the SCREEN voltage. There are 2 controld on the flyback - the top one is FOCUS and the bottom one is SCREEN. As the tube ages its emission decreases, and the computer monitors the tube's emission. When the emission gets to be too low, the computer shuts the set down. This is exactly like IK blanking in Sony sets, except Sony blanks the video and Philips shuts the set off. To set the screen voltage properly, turn the brightness and contrast to 0, raise the screen voltage until you see the white retrace lines in the picture, and then back down on the screen voltage until just past the point where the retrace lines are gone. Reset your brightness and contrast and the set should play fine.

Aug 13, 2007 | Philips 20PT6441 20" TV

2 Answers

Question about the voltages.


what is the question please?

Oct 20, 2006 | Sanyo DS27510 27" TV

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