Question about Philips TP3281C TV

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Philips tp3281c chasis#32d700-7570

How can I test the horizontal output transistor of this set with a simple multimeter?

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Re: philips tp3281c chasis#32d700-7570

I believe this set has a horizontal output that has a damper diode inside. you can check inset or out, most popular is out set. take multimeter and put on ohms or continuity and touch each leg by holding one lead to end and if you are looking for a short then in continuity it will beep or zero or very ohms. And Ohms just the same way. looking for low ohms like 1.0 or 0.9 or anything close. Switching leggs back and forth. If all three legs are shorted then replace. but in this one 2 can be shorted and still be good, just depends on which ones

Posted on Aug 29, 2007

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Am I testing this horizontal output transistor correctly?

Check the resistance between collector and emitter. It should never be Zero Ohms.

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Check the frequency at the base of the horizontal output transistor. It should be in betwen 15.5 to 15.7 KHz. If you want more details about service help, try any service help sites. There are so many can be at internet.

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You are talking about the horizontal output transistor damage I assumes and post this solution. If LOT has internal winding short, the horizontal output transistor will get shorted. It will be best to replace the horizontal output transistor, alongwith the LOT

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Will not come on. light blinks 6 times

Six blinks denotes the absense of horizontal sweep. Check the horizontal output transistor, whcih can be located very near to the LOT [Line Output Transformer]; for short. If it is shorted, LOT must be suspected. Replace the line output transistor with a new one, and switch ON the tv for a short period of time, say 6 seconds or so, and check the heat of the replaced transistor. If it overheats within this time, be sure that LOT is damaged; shorted inside; and should be replaced with same type and number. If a digital multimeter which can measure frequency is available, take the frequency at the collector of the horizontal driver transistor. It should come around 15525Hz. If not replace the jungle IC. OK.

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1 Answer

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If you have tested the secondary section of the SMPS power supply of your Sony TV, amd found it OK I thinks, and posts this solution.

If the secondary supply rail 125VDC is found ok, just goto to the Horizontal Output Transformer, a small transformer diretly soldered on tho the main board, very near to the Line Output Transformer [LOT], and its secondary winding is connected to the base of the line output transistor, which in turn drives the LOT said above, generates EHT you described.
The base of the line output transitor must get appropriate frequency to switch on and off. This frequenct is gerally comes to 15625Hz. Just measure the voltage across the primary winding of the above said line driver transformer, which can be a possiblity open winding. Check the voltage at the collector point of the line drive transitor connected ti the one end of the primary winding is easy. Then check the voltage at the other end of that winding. There must be a little difference of 2VDC or so, if the line drive section is working, and fault is after that section, that is line output section. If you have a digital multimeter capable of measuring frequency, measure the frequency of the collector point of line drive transtor, and find out whether there is 15625Hz or near to this frequency comming out. Never touch the multimeter prob to the collector of Horizontal Outout Transistor, while it is working. Your meter will get damaged.
Line output section, contains tha LOT said above and line output transitor. If the Line Output Transistor has some sort of leak, normally collector to base leak, it will not drive the LOT to produce EHT and it wlii heat up also.
Just check it heat effect, after switching the set on for a short period of time, say 30 seconds ro so. If it heats up abnormally, suspect the line output transistor and LOT. You just replace the line output transistor first, with same type and number. If it doesn't retify your problem, LOT said abve is faulty, and it also should be replaced with same type and number.
If you have to replace the horizontal output transistor, and the LOT said abve, insist on orginal, and not replace it with a susbstityution, as these are critical components in all TVs..
If you need further assistance, get me through Fixya, and be free to conact me. Ok

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1 Answer


Hello valexandrur,

You are in the correct section, now your problem may be a shorted Integrated High Voltage Transformer (IHVT) also called a Fly-back Transformer and or a shorted Horizontal Output Transistor (HOT). I would first check the Transistor to see if it is shorted between the emitter and collector (to do this use a multimeter set to "Rx1") and the reading between the emitter and collector should be near infinite no reading, if the reading is 000 ohms then the transistor is shorted and should be replaced. Now for the hard part, you technically can not check for shorted transformer turns in the IHVT using a multimeter, you will have to use a device which will allow you to do what is called a ring test. If you do not have this piece of equipment (IHVT tester), I would replace the IHVT just as a matter of good measure, since the HOT had drawn a lot of current I would assume that the IHVT was damaged to since it is in the serial path between the collector of the transistor and the VCC supply.

I hope this helps,

Thank you,


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2 Answers

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One special transistor is there. Before you change the transistor please sure that this is the first time problem or repeat H output TR failure. If it is first time means simply change the special type of transistor C5591. This is the high current rated tr and Panasonic is the manufacturer. Repeat H out failure means do the following simple works. If there is any capacitor between H sync output from Ic and horizontal drive transistor. Reduce the mf value and slightly increase flyback capacitor value. And then put the new horizontal output transistor.

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1 Answer

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The F27669 uses the CTC203 series chassis. The most common cause of that symptom is a shorted horizontal output transistor, caused by a cracked solder joint on a small coil connected to that transistor's base. When this happens, the main B+ supply is shorted to ground so the power supply squeels. Every once in a while I also see the horizontal output transistor shorted due to a shorted flyback (high voltage) transformer. A good tech will replace the horizontal output transistor, resolder the coil and drive transformer, test the flyback (replacing it if necessary) and your set will be back to perfect.

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1 Answer

TV Buzzing

What is it your looking for my friend. Im sorry I do not understand the way you asked the ? If ita the location of the horizontal output transistor. Its Q1401 but thats not your only problem 100% !!

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