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Flyback xfmr substitiute

I need a sub for the flyback on a kv-25xbr about 20 years old. Part no. 1-439-339-12. I changed the horizontal oscillator transistor which was getting super hot; but still getting low voltage from the xfrm

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Hi and welcome to FixYa,

Initially, have you tried here, here or here?

To verify FBT, a ring test would help.

Good luck and Thank you for using FixYa.

Posted on Jan 08, 2009

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  • Master
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Click here to find the FBT.

Posted on Jan 08, 2009

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1 Answer

Tv repeatedly goes into standby mode


for crt television,1.you need to check if processor is ok because automatic blank limit from the flyback transformer is control by processor.2.the reference voltage from the smps transformer aprox 5vdc.3.flyback transformer need to be tested because it might breakdown during full compensation.4.check b+ if adequate.
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If you have the older TV with a CRT, here is my answer. By now this TV has a loose capacitor. The capacitor will not have any solder around the pin for a proper ground. Next, there may be a large power resistor that is not attached to the board as for the same reason as the capacitor mentioned. I have not repaired your TV model, but experience tells me what to do. You asked, so I'm sharing. These are just one of many grounds. You will need to solder the vertical IC, Horizontal transistor, horizontal transformer, flyback transformer etc. You will have to inspect the board for any and all solder grounds. Also, be sure to resolder the small board that is attatched to the CRT (pull this board off carefully and then solder). You should not have to purchase any parts, resoldering will bring it back to life.

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ii capacitors changing values
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Jan 08, 2009 | Televison & Video

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1 Answer

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Did the technician said what was wrong with the transformer?(leaky)?,It might sound like air but is High voltage leaking from the top ,be very careful when proving around there and just get it change because is not repairable and dont use it or it will damage other components.

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