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Problem with TCL Television

My TV model is TCL 2027,I have a problem with low horizontal collector output it is only 24 volts when i measured it,the Transistor is D1555,anyone please help locate the exact faulty electronic parts i have already replace the output transistor but it has no effect..thanks and more power,e-mail me @ cincinati_07@yahoo.com for any reply

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I have also a problem regarding the TCL-2027 the trouble is half screen.I replace the vertical IC together with all neighbor capacitor but same problem unsolve.so please help me asap.and what
is the service mood of TCL-2027.just send your help at jurie7@yahoo.com.

Posted on May 13, 2010

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Posted on Jan 02, 2017

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Check its horizontal output transistor for short circuit. It is a common fault to all type of CRT based TVs, and show this type of fault. If it is found shorted [collector to emitter], the LOT should also be checkd for winding short [internal]. Normally; LOT cannot be checked with normal measuring instruments. If LOT has internal winding short, the horizontal output transistor will get overheated and finally shorted.
Replace the horizontal output transistor first, and check whether it heats up ubnormally within seconds after switch ON the Tv. If it heats up so, make sure that the LOT is defective, and it should also be replaced. OK.

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ALL the next is with the tv unplugged (NO NO power)
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Hello miko_alexand,

That problem indicates that the Horizontal Output Transistor (HOT)is beginning to malfunction. I would suggest that if you have a background in electronics that you do the following:

1) unplug and open the back of the set

2) look for the HOT and locate the Collector, Base and Emitter of the transistor and using your multimeter set to read resistance measure from the collector to the ground, it should read high almost infinite, red from base to ground it should read low and from emitter to ground it should read low.

3) if the HOT when read from the collector to ground reads low then you can bet that the HOT has a short circuit from collector to ground, and will have to be replaced.

4) In addition I would also perform a ring test on the Integrated High Voltage Transformer (IHVT).

This will tell you if the IHVT has suffered any damage from the HOT malfunctioning. You may end up having to replace both of the components.

If you do not have a background in electronics I would suggest that you take the TV to your local TV repair facility.

Thank you,

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http://www.electron-age-technologies-llc.com

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