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HT problem, horiz. transistor with high current

I replace most of the components at the horizontal output, when I put out the LC circuit at collector of the output transistor, the high current disapear, but have small HT, if I put out the C asociates at colletor the HT are increased, but not good.
The Fly-back was replaced, the transistor was replaced, etc,etc,...
I have this projector working without all this components, but have problems in the left side of the screen, distorsions.

Erif Balut

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4 Suggested Answers

  • 2267 Answers

SOURCE: Horz. Output Transformer for a GE Mod#46GW945

Check this guys: //http://www.electronica-usa.com/
This guys may carry that part: //http://www.globalsemi.com/search.aspx

Posted on Jan 24, 2008

  • 27 Answers

SOURCE: Horizontal Output transistor

IGBTs do not work well at high frequencies. They are not very linear, either. Even if it works, you'll likely wind up with a compressed and distorted picture.

Just put in an equivalent output transistor and call it a day.

Peace.

Marco

Posted on Feb 04, 2009

  • 4234 Answers

SOURCE: Replacing horizontal output transistor

Many times, the only problem is hte transistor itself. There is really no way to determine whether or not additiona parts are required until the known defective one is replaced. If there are other symptoms once the transistor is replaced, post them here and we'll guide you to the defective parts.

Dan

Posted on Feb 09, 2009

Slinteriors
  • 8617 Answers

SOURCE: Flashing power light

Check for these power supplies on the Sub deflection board first on the right side of the board there are two Connectors one is a 12 Pin connector CN803 From the top of the connector the wires should read;
30V
Gnd
Gnd
-30V
8.5 V
8.5 V
Gnd
Gnd
-8.5 V
Gnd
Gnd
13.5V
Next is the connector below that one which is a 10 pin connector CN802 they should read
11.7V
11.7V
N.C
Gnd
CTL
Gnd
34V
34V
Gnd
Gnd
Next is a 14 pin connector on the top left side of the board CN801 those should read
34V
34V
Gnd
Gnd
-8.5V
Gnd
8,5V
8.5V
Gnd
13.5
NC
12.5
12.5
Check those supplies and see if they are correct or if any are missing

Posted on Mar 09, 2009

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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.

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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.

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

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1 Answer

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Hello sedekim,

First check you connections to the circuit board some times the connections go bad from the deflection board to the signal board, if this is not the case the bottom advice may be of help.

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

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Check this guys: //http://www.electronica-usa.com/
This guys may carry that part: //http://www.globalsemi.com/search.aspx

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