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kolin tv burn focus control

 
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fesb_gerry



Joined: 20 Oct 2007
Posts: 4

PostPosted: Mon Oct 19, 2009 5:49 am    Post subject: kolin tv burn focus control Reply with quote

after replacing kolin tv model kct2177 flyback with replacement BSC2409g blur picture screen for a few second and i smell smoke coming from flyback focus control and crt connector. but the hor out transistor still good.
could it be flyback factory defect? or something else?
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Mon Oct 19, 2009 2:48 pm    Post subject: Reply with quote

Check the flyback capacitor(s), those are usually 5-10 nF polypropylene capacitors connected from the collector of the output transistor to either ground or a point in the E/W diode modulator.

Also, you should check everything in the current path through the horizontal deflection coils (solder joints, connectors, series coils and/or capacitors and so on) for open circuits.
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fesbgerry
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PostPosted: Tue Oct 20, 2009 2:21 am    Post subject: kolintv flyback Reply with quote

tnx man for tips.i,ve check the capacitors and solder joints/paths around hor section everything is ok. hor collector voltage is 110v normal voltage of the set heater voltage around 6vac no other secondary supply from thie flyback rest of the supply voltage from smps power supply which is in good reading.
anyway im returning the flyback for replacement will post the result next time
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PostPosted: Fri Oct 23, 2009 3:37 pm    Post subject: Reply with quote

i manage to get the replacement flyback and crt and replaced burn crt socket
it works now.according to some tech could be the crt socket fault causing flyback focus burn.but im convince it is a factory defect since the crt socket spark gap pupose is to protect the crt from flyback right?
thanks to your suggestion.
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Tue Oct 27, 2009 9:37 am    Post subject: Reply with quote

The purpose of the spark gaps at the CRT socket is to protect sensitive circuitry elsewhere in the tv from voltage transients due to high voltage flashovers within the CRT.
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jmtech
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PostPosted: Tue Nov 03, 2009 2:59 pm    Post subject: kct-2177 flyback transformer Reply with quote

can i ask you something bro,what's the part no.of jungle i.c and system control you used in your mainboard?and also what type of crt tube?monitor or standard?coz i work in kolin factory before so hope you can reply A.S.A.P..thanks..
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