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Colour television problem

I got some problem in samsung colour television,
every time i replaced EHT transformer deferent models
the retrace line visible in screen i coudnot adgest screen voltage

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No power

Posted on Aug 25, 2008

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Hi,i just change the flyback of my sony KV-21JSR1 ,but still it's not working,it has sound(audio volume is working)but no raster,the flyback that i bought is only generic,because originals are not...


Hello
Have you a digital multimter that can count frequency. if so the testing will be easier to you. Just count the requency at the collector point of horizontal driver transistor, or at the base of horizontal output transistor. it should come around 15.625KHz [15625Hz]. When the tv wors with no signal this frequency may differ, but come very near to it. When it synchronises with a picture, it won't vary and will remain constant.
If you have no frequency counter, just measure the voltage at the collector of horizontal driver transistor. It will be normally connected to the primary winding of the line drive transformer, which is very small transformer on the PCB. Then check the voltage at the other end of that trnsformer, where supply to the collector of the above said trasistor is given. The voltage at the collector side of the winding and at the other side of the winding must have some difference, if the frequency said above is present, and drive transistor is working.
If there is no voltage, check the resistor connected to that winding to main power supply for open, or the capacitor fitted to that point to negative for short,,, or check the continuity of the driver trasformer primary winding itself, or a short between its primary and secondary windings.
If all of there are ok, and still LOT doesn't works, check the supply voltage to lot. Being a 21" TV, its LOT supply voltage comes upto 125VDC or so. If it is also there, try replacing the horizontal output transistor. It also doesn't help, the Line Output Transformer you have replaced is not the exact match. Sony EHT transformers are critical in construction and in winding. Keep it in mind, and buy an another. If you need any assistance freom me, don't hesitate, ask me through Fixya. OK.

Nov 05, 2010 | Sony Portable Televisions

1 Answer

Horizontal output transistor damage or get short when on..what is the right parts of the transistor? sharp linytron 110 volts.


Check the diode and transitor associated with this circuit. Mostly in the EHT transformer side. Better replace with a identical type. It is difficult to find the leakage in the diode.

Unless you rectify this, any number of times you replace the power transistor, it will immediately get shorted!

Mar 29, 2010 | Portable Televisions

2 Answers

Sony tv model kv-32xbr55 There is a 7 inches green horizontal (running from top to bottom) bar blocking the left side of the tv screen. Sometimes the screen goes dark but turning it off and on gets it back...


check and change the line transformer. that transformer with a big cable running to your tube. that has a leakage in side it. after some time it is changing values.

Feb 23, 2010 | Tvone TV-207 Television

1 Answer

How to change a IR sensor in a Panasonic model CT-27G7SDF TV?


CHECK FOR BROKEN SOLDER AROUND THE STANDBYE TRANSFORMER FIRST
you must pull chassis check and resolder all transformer pins on underside ir diode is front of chassis in line with tack switches
check for 5volts replace if bad

Aug 31, 2009 | Panasonic Portable Televisions

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Retrace line&redesh on the screen


Would you let me know model and make of TV?

Aug 06, 2008 | Portable Televisions

1 Answer

POLAROID TTM2401


Check components around the flyback transformer. Especially small value resistors and diodes. Also check the solder joints on the flyback transformer. Please be safe and unplug set when checking parts, also discharge caps or wait a while after unplugging.

Geno

Jan 24, 2008 | Portable Televisions

1 Answer

OLD Scott TV without original remote


Most all sets have a screen control in back on the flyback. this is the transformer that goes up to the picture tube. It should have screen and focus control, screen you can turn up or down.

Sep 18, 2007 | Portable Televisions

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