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No eht in a LG sampoorna kit no eht problem. 3.3, 5v for memory, 8v are ok. i replaced hdt coil,h out transistor .but compliant still remains

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Disconnect the horizontal driver transformer output pins and connect an led there to find the it is oscillating, if it does, then it could be the LOT. Try replacing the oscillator ic if there is no oscillation.

Posted on Jan 24, 2008


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Posted on Jan 02, 2017


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I m ramchandra patil, i m used china kit which is used ic hay 22 8873csng6pr6. Eht ok, no picture, no sound. 5 volt,8 volt is ok. Pls give me solution tips. Thanking u

Disconnect the horizontal output transistor, and switch ON the set without it. See whether it switches ON. If yes, suspect both LOT and horizontal output transistor. This is a common fault to this kit. More to say, if the tuner get shorted inside, this might happen too.

Jul 17, 2014 | Televison & Video

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

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.

Sep 15, 2010 | Televison & Video

1 Answer

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


Aug 27, 2010 | LG Televison & Video

1 Answer

What is the problem if only retrace line appears on screen and without picture output? what circuit has a problem if b+ voltage increases up to 150vdc and it kills the horizontal output transistor...

1. Check the opto coupler in the SMPS circuit. Replace it with
This is feed back, to the switching transistor to control the oscillator.
2. Horizontal out put transistor going defective.

This is due the failure of diode near the EHT coil primary and
the transistor. The reverse leakage of the high voltage diode can not be
checked by the meter. Hence replace all the black coloured diodes
in the horizontal deflection circuit diodes with identical part no.
Horizontal out put TR will get over heated and will rupture. When you
replace with new transistor switch on TV and switch off immediately.
The heat sink should not get heated or warm up. This is the only way
you can protect the transistor when you replace other components one
by one.

After checking all the small components, finally EHT coil.


Aug 19, 2010 | Televison & Video

1 Answer

I have a problem about eht damage in hyundai colour tv model no. CTVHY22FW01 so many times. And bigger problem is eht no. is not available in your company's service station. So how to solve this problem?...

Your question is not clear.
However if the main EHT drive transistor failing often check all the diodes and capacitors. Sometimes you can not check the diodes for reverse leakage. Better replace the diode with identical type and part no.

If your EHT coil is failing, buy a similar coil with identical coil resistance value. Generaly new EHT coil can not fail in a short span.

Take care while handling E H T areas. It is more than 25,000 volts A C & DC.
Extreme caution needed while disconnecting the suction cup on the
picture tube. Switch off wait for few minutes every time you attempt.

Aug 10, 2010 | Televison & Video

1 Answer



Jan 24, 2009 | LG KU990 Viewty

1 Answer

Monitor horizontal adjust no function

It is the problem of horizantal section.Check horizantan hold transistor that is placed on hitsink of eht and two small transistors near iton pcb.and check horizantal yoke coil pins for dry soldring or low voltages.If thats are ok then change hori. &ver. deflection ic.
Hope this solution works.i am always for you

Mar 15, 2008 | Gateway FPD2275W LCD Monitor

2 Answers

Horizontal and vertical adjustments

Check components related with pots thats adding command ic to pots.If they are ok then change command ic with new one.Before this you can check horizantal hold transistor that is placed on hitsink of eht.small in size and check two small transistor placed near it on pcb.Hope this solution works .If not then i am here

Mar 10, 2008 | LG Studioworks 45 14" CRT Monitor

2 Answers

No raster no audio,Zenith SJ 2065S5

as horizontal transistor gets very hot so no eht so no raster &no sound due to nosupply to vif & tuner. as hor output is getting hot please isolate supply to hor. section & check power supply output is ok as due to high voltage h/outout may get hot & demaged. if supply is ok check for leaky or short parts in hor output. 1 hor. output transistor itself if it is replaced that may not be of proper matching. 2 diode& eht section. 3 clean print near eht. 4 moisture near yoke due to rain in rainy season only. so keep it hot for few hours. 5 at last if all are ok eht or fly back transformer. re connect power to hor output after rectification

Sep 18, 2007 | Televison & Video

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