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 @ firstname.lastname@example.org for any reply
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 email@example.com.
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Hello 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.
Check the LOT and Horizontal Output Transistor. If horizontal output transistor get shorted [collector to emitter or collector to base], this kind of fault will occur. Here there is nocollector to emitter short as B+ is ok. Check for collector to base leak. It is best to repalce the horizontal transistor with a new one, and switch on the Tv for a short while, say 10 seconds or so, and feel the heat of the replaced transistor. If it gets overheated, of LOT makes a whisiling of hissing sound, LOT is faulty, and shoul be replaced sith same type and number. OK.
ALL the next is with the tv unplugged (NO NO power)
resold the jungle (video processor) all around
following the horizontal drive pulse path and arriving to the horizontal area just after the horizontal transformer and in the base of the horizontal DRIVER there is a electrolytic capacitor (if this chassis uses this one,) Change it (maybe is dry)
solder all components i just told you in the last step. horizontal driver, transformer, etc
if a transistor is blowing with no reason (there is a reason: the collector receives 130 volts but cannot hold it forever, It has to be in some place. if the switching pulse doesn't arrive to it the transistor throws this 130 volts and burning itself. i hope it is help full.
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.
Never measure the collector of the horizontal output transistor. When the set is on that voltage is spiking upwards of 1000 volts and could seriously damage the meter and possibly shock you. Measure the B+ pin on the flyback instead, it should be 135 volts. Usually what I find is that the flyback itself is shorted, so when you turn the set on the B+ comes up and the horizontal output starts conducting, but the computer senses the extra current in the flyback and shuts the set back off. The red timer light on the front of the set will then blink a certain number of times to indicate exactly why the set has shut down. If you do not have experience analyzing the Sony shutdown circuit then have a qualified tech handle it for you.
If the output transistor is good you need to measure the voltage at the collector to see if it has the needed voltage to operate,is also important to check the conections in the horizontal driver transformer and also measure the volts at the collector of the horizontal driver transistor,before you check any voltages check for loose conections and overheated areas,after everything is nice and solid then you can check for volts,be careful while measuring voltages and try not to touch anything with your bare hands while the set is on.Let us know how it goes or if you need more information.
The voltage might be low because is being loaded down,open the collector of the output transistor and measure the voltage again,if it goes up to 130 or the voltage is suppose to have you might be looking at a bad output transformer(flyback)there are other parts that can cause the loaded down voltage,the yoke can be one and capacitors in the deflection circuit,check to see if one of this caps is overheated (bubble)or cook,Be carefull if you open the collector when you measure the voltage,If you can try measuring the voltage somewhere else.Lets Us know if you need meore help.