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My television model TCL 2027U on standby, no picture, why the power transistor heat zinc overheat? The emiter to base of D1555 is shorted. I replace two time this type of transistor but burned/shorted again.

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My tv tcl 2027u problem stand by power no picture? pls help how to repair....

Posted on Jun 26, 2011

  • rolando ortega Sep 02, 2012

    pls check the hor. deflection yoke i have already encountered the same problem

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Try to check the horizontal defflection yoke

Posted on Sep 02, 2012

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Check the flyback transformer

Posted on Oct 15, 2013

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1 Answer

How to repair tcl 21189 u h-out always shorted


If horizontal output transistor shorts repeatedly, the reasons are so many.
Freewheel capacitor [****pF 2500V]
Shorted winding in the deflection yoke.
Horizontal oscillation frequency is more than normal. [Main IC fault]
Over voltage B+. [Comes out from SMPS]
Horizontal drive transistor and/driver transformer fault.
Check all these. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

Apr 11, 2014 | Televison & Video

1 Answer

What is the use of Transistor D1555?


That is a generic number and actually is a 2SD1555--it is the horizontal output transistor used for the high voltage the set develops for light on the screen among other things---out of circuit it should have no short from C to E. Emitter to Base will likely be a low reading but Base to C should have a reading in only one direction--at least 4000 ohms and nothing in other direction.

Dec 14, 2012 | Protech PTV-707 Television

1 Answer

Picture on Samsung TXL2791F gets smaller after a few minuets


The horizontal output transistor that drives the flyback transformer overheats now. There might be other reasons too for this fault. If the flyback transformer has any internal winding short, this transistor will overheat.
Just replace the horizontal output transistor. Check its heat. If the newly replaced transistor too overheats, replace the flyback transformer.

May 24, 2012 | Samsung TXL2791F 27" TV

1 Answer

I HAVE A TV SET MODEL TCL-I4175 MY PROBLEM IS WHEN I PLUG THE LINE CORD AND SW ON THE THE PUSH BUTTON THE FUSE ALWAYS BLOWN OUT . THE LAST TIME I HAVE REPAIR MY TV SET AT FIRST I HAVE REPAIR IT AND ITS ...


I am not familiar with this make but normally the cause of line stage transistors blowing is either power supply faults, line transformer issues or tuning capacitors including flyback diode issues.

Jun 23, 2017 | Televison & Video

3 Answers

Tcl 2027u problem standby power no picture?


bad ,domed or leaking capacitors.

Jun 26, 2011 | Televison & Video

1 Answer

Dear sir i have samsung 21 inch flat television now horizontal drive transistor fails after few hours i replaced 3 times the same transistor(tt2222) but again geting fails so pls let me know what is...


Hello
You just replace the freewheeling capacitor, normally come up to a value of 5600pf 2000V or so, connected to the collector of the horizontal output transistor, fitted very close to the collector lead. Replace the yoke return capacitor, 0.33uf or so also. Usually samsung sets use no heatsink for the horizontal output transistor. You just put a small heatsink to it and check. If it doesn't overheat, you can remove it later.
You can suspect the deflection yoke also for shorted winding. To check this. pull out the CRT base board out of the neck of the picture tube, place it where it doesn't get short circuited, and unplug the deflection yoke connection from the main board, and switch on the set. See whether the transistor overheats now. If it doesn't overheat, suspect the deflection yoke for shorted turns of winding inside it. Till the transistor overheats, suspect the LOT.
NOTE: Never switch on the set while unpluging the deflection yoke connection plug from the circuit board, without dismandling the CRT base board. CRT may get damaged, with a black burned spot inside the center of the screen.
OK.

Dec 15, 2010 | Samsung CXJ1952 19 in. Combo

1 Answer

Horizontal driver too hot, no eht, power suply is ok.


Hello

If horizontal output transistor gets over heated, the either LOT or Deflection Yoke may have some short in it. You just pull out the picture tube base card from the picture tube neck, and place it somwhere. so that it never gets in contact with any other circuit parts of the TV. Pull out the deflection yoke plugin and put the tv ON, and see whether it overheats now or not. If it overheats no also, LOT is defective, and should be replaced with a same type and number. If it does't overheat now. put the unpluged yoke connection, and switch it ON. If it gets overheats, there is some short in between the horizontal winding section inside the deflection yoke. Caution:- Never place the picture tube base board connected to it, while deflection yoke is disconnected. OK.

Dec 06, 2010 | Televison & Video

1 Answer

What causes the horizontal transistor to short? flybak ok, supply line ok. my tv is a samsung with a model #: ct-21k30mh.


Hello
You just replace the capacitor fitted very near to the horizontal output transistor,[freewheeling capacitor], there may be one or two of them, whcih comes to a value of 3900pf to 6700pf 2000V or so. It is connected to the negative rail and the collector of the horizontal output transitor. If it gets opened, or its value gets reduced, this fault will occur. If so the transistor you replace will get shorted as you swich on the power to TV.
The second one is deflection yoke short. If so the transistor said above will overheat within seconds. Even a single winding inside the horizontal deflection yoke shors, it puts a tremendous load to flyback transformer, which in turn effects the transistor.
After replacing the above said capacitor, you do one thing to make sure about whether there is a short inside the yoke or not. It cannot be measured by normal methods. Fore that, unplug the base card from picture tube and place it somewhere near without getting any of its contacts to other parts inside your TV. This time only the EHT chord will be connected to picture tube. Unplug the horizontal yoke connection from main board. Switch on the tv, and wait for some time, say at about 10 seconds, and check whether the transistor gets overheated or not If it does overheats now also, the winding or EHT retifier diodes inside your flyback transformer has some trouble, and it should be replaced with same type and number. If it does not overheats now, the deflection yoke's winding have some short in it. Ok.
NB: Never connect the TV with base card is in postion while deflection yoke connection is isolated. keep it unpluged.

Oct 27, 2010 | Samsung Ultra SlimFit 20" Digital TV

1 Answer

Problem with TCL Television


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.

Jul 01, 2008 | TC Electronic Computers & Internet

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