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Lg flat 21 inch tv -horizontal o/p transistor burn after 1 minute & sound chik chik

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  • Anonymous Mar 26, 2014

    figure don't show in full height lg flat tv 21"

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You have to check the high voltage diodes near the horizontal transistor and the small transformer. Diodes might have gone leaky. Check the capacitors also.Replace the black colored diodes with new ones with identical part no.

Rarely EHT coil will have problem.

Posted on Sep 15, 2010

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Posted on Jan 02, 2017

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Lg 21 inch platron crt tv eht high ocilates,110 volt ok ,dt changed


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. Pull up older posts.
http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site.

Nov 21, 2016 | LG Televison & Video

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Lg 21" horizontal transistor burn in minute.plz tell us solution


If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Feb 23, 2015 | LG Televison & Video

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I have LG 21 COLOR FLAT TV MODEL J4RGE3AZ. THE PROBLEM IN MY TV IS THAT WHEN MADE ON IT GOES TO STANDBY MODE AFTER 7 TO 8 SEC. PLZ HELP ME TO RECTIFY THE PROBLEM PLEASE.


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/
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Feb 05, 2015 | LG Televison & Video

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When i switch on 21 inch lg tv the voltage in power supply section continuously falls to 0.2 and tv wont power on


Short circuit at the main board. Check the horizontal scan output transistor for short circuit. Check its collector to emitter, or collector to base for short. Replace this transistor and check. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/

Jan 17, 2014 | LG Televison & Video

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Sony tv 21 inch horizontal output transistor failing frequently


• Power Supply B+ is higher than normal


• Partially shorted Flyback Transformer


• Bad Deflection Yoke


• Too much oscillation on the Jungle IC


• Bad capacitors around the horizontal output transistor

Sep 27, 2012 | Jwin JV-TV9090 21 inch TV

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Solutions to auto shut off lg crt tv 21


check for a defective horizontal output transistor.

Aug 16, 2012 | Sony FD Trinitron WEGA KV-27FS120 27" TV

1 Answer

One horizontal black line about 1 inch wide, in the almost center of the screen


check the horizontal transistor it is faulty or the diode at the collector of the same transistor it can be open or shorted.if you are not a tech, have a tech repair your tv..good luck.

Sep 20, 2011 | Samsung 50 in. Plasma TV

1 Answer

Tv not switching on just makin noise from power supply & hissing @ the flyback transformer with horizontal becoming extremly hot then afew min later horizontal burns out(D1398)


If the horizontal transistor getting shorted, this could happen.
Check the transistor 2 SD1398. If found faulty replace it.
But replace black colored doides in the circuit as a whole.
Leaky diodes can not be determined easily with the multi meter.
Especialy the small high voltage diode near the small transformer
connected to the 2 SD1368 transistor.

Sep 03, 2010 | Televison & Video

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I have one LG 21" color tv ( MACH 4 model) and it is not getting start.It was working properly with some hissing sound but yesterday it didn't started, the LED at the front panel is glowing but TV is not...


Hissing sound comes from leak EHT transformer but front LED working means your power supply is ok so you need to check horizontal out out Transister and series resitor feeding to voltage from B+ to that transistor if it's gone pls replace the EHT transformer as well
in srilanka EHT is around $5 and transistor is $1

thanks

Aug 27, 2010 | LG Televison & Video

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Samsung 40 INCH TFT-LCD Cant start up at all .


The noise you are hearing is the power supply attempting to start up. Unfortunately, a component has failed inside the power supply circuit. Most likely it is a capacitor. The good news is that the set should still be under warranty and the repair should not cost you anything. The bad news, is that the service person may not have a replacement power supply board with him/her when he/she arrives. This should be a quick fix as the replacement board is relatively easy to change.

Dan

Feb 04, 2009 | Philips Televison & Video

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