Question about Samsung HCL4715W 47" Rear Projection Television

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Horizontal Output transistor

Hey, I am going to be replacing the horizontal output transistor but I am wondering if I could sub something else in. I am wondering if someone could tell me the base drive that the transistor has on it. I was looking at an IGBT that would work great if there is at least 10V of drive on the gate. If I could even get the schematic on that portion of the circuit that would be even better. Thanks

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  • Andrew Hawkins
    Andrew Hawkins Feb 04, 2009

    This one is very fast though, and the one I just found needs around 6 volts of drive.

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  • 27 Answers

IGBTs do not work well at high frequencies. They are not very linear, either. Even if it works, you'll likely wind up with a compressed and distorted picture.

Just put in an equivalent output transistor and call it a day.

Peace.

Marco

Posted on Feb 04, 2009

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1 Answer

Samsung hcr5245wx xaa


It sounds that the horizontal output section circuit has the fault. The horizontal output transistor might have burned out. Check it.

May 23, 2013 | Projection Televisions

1 Answer

I have a 32" RCA


Hello
According to you, your RCA TV has went off while watching it. As there is no sound or picture at all, and the power kicks, the fault must be to its horizontal out section. The horizontal output section have LOT [Line Output Transformer] and related parts in it. Your TV must be chcked well to detect the actua fault. Normally, the LOT said above can be faulty, otherwise, the horizontal output transistor, the device that drive the LOT may also damaged. If this transistor gets leaky, the secondary main power DC supply will get a direct short, and the set will come on protection mode as we switch it ON. Here, according to you, this is happening. Just replace the horizontal output transistor first and see the effect. It is a three terminal component, screwed on to a metal heatsink, and can be located very near to the above said LOT.
After replacing it, switch On your TV, for a while, say 5 seconds or so, and if a whisiling sound is heard, and the replaced transistor over heats, the LOT said above is faulty, and should be replaced with same type and number. OK.

Apr 05, 2011 | RCA HD52W59 HDTV Projection Television

1 Answer

What Is There To Ask About A Hori Output Tramsistor?? It Needs To Be Replaced I Guess??


The horizontal output can be open and the set wont have High voltage or it can short which will usually blow a fuse. The transistors cost about 10.00 - 12.00 for quality Horizontal output transistors.

Dec 05, 2009 | Projection Televisions

1 Answer

SONY KP-61V90 tv will not power on, red light in front,


Its 2 times blink error code that shows +B volt supply (+135 volts) is shorted, most probably horizontal output transistor is shorted, replace it.
If you are good in soldering parts in circuit board then take out horizontal transistor, check it, found shorted then replace it with same number.

Horizontal output Transistor Q502 number is 2SD2578 and available in Part Store for $10
Let me know for further query, if any.
Thanks.

Nov 18, 2009 | Sony Projection Televisions

2 Answers

No picture


I disagree with given info, this tv has no horizontal output transistor because it is dlp tv.
3 red light blink means lamp cover is not placed back properly after lamp replacement/ lamp checking. Make sure lamp cover is fixed back in its place securely and tight.


Jul 16, 2009 | Sony Grand WEGA KF42WE610 42" Rear...

1 Answer

Replacing horizontal output transistor


Many times, the only problem is hte transistor itself. There is really no way to determine whether or not additiona parts are required until the known defective one is replaced. If there are other symptoms once the transistor is replaced, post them here and we'll guide you to the defective parts.

Dan

Feb 05, 2009 | Samsung HCL4715W 47" Rear Projection...

1 Answer

Flyback transformer and horizontal output transistor change out


There is a little loose sleeve at the transformer. It can be pulled out, but it is best to squeeze the sides through hole on each side of the terminal to remove the sleeve. The wire just comes out with a small pull afetr the sleeve is removed. Good luck.

Dec 20, 2008 | RCA Projection Televisions

1 Answer

Zenith


First, locate the horizontal output transistor. This is found very close to, or next to, the horizontal output transformer (also known as the flyback). The flyback should be on an aluminum heat sink, or on the side of the metal chassis. Disconnect or unsolder two of the three legs of the transistor. Measure it with your meter, or plug in the set with the light bulb attached across the fuse.
If the transistor is shorted, or the light bulb doesn’t glow bright anymore, replace the transistor and plug back in. If the light bulb glows bright again, you must replace both the flyback and horizontal output transistor simultaneously. In some cases this will fix the set, but sometimes there are multiple problems with a set.
Go to where the flyback is, and start measuring the diodes and capacitors on the flyback itself. If you don't find any shorts there, it could be a shorted vertical output IC, a shorted sound IC, a shorted disc capacitor in the Hi Voltage/sweep circuit, or in rare cases, a shorted capacitor or tuner.Feel free to ask and post whatever the result of your troubleshooting..


Hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE

Aug 10, 2008 | Zenith R49W36 49" Rear Projection HDTV

2 Answers

56" RCA projection TV


If you can find the horizontal output transistor which is located near the flyback transformer,one lead of this drive transformer is connected to the base lead. (horizontal output transistor). There may be a little coil in series with this lead going to the transistor.

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