Question about Samsung HCL4715W 47" Rear Projection Television

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Replacing horizontal output transistor

I am going to be replaceing the horizontal output transistor that was suggested and I am wondering if there are parts farther down the circuit that I could replace to prevent the 2sc4125 from blowing again. Thanks

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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

Posted on Feb 09, 2009

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Tv wont turn on it just has a whisling sound no picture on screen


Try replacing the HOT Transistor ( Horizontal output Transistor) thats usually the cause in most cases. If you need assistance locating it in the set or finding the replacement let me know.

Oct 15, 2011 | Philips 60PP9202 60" Rear Projection...

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Hi,im a technician and i got a problem with a Sony Trinitron Colour television model Kv-T29mn3. I replaced an Str, capacitors & Horizontal Output Transistor. Voltage output its okay but it keeps on...


These sets had alot of problems with bad FBT flyback tranfomers,You might need to change FBT.
Heres another thing they also had Bad Picture Tubes that will blow hori output and you will not know its the Tube untill you replace the FBT.Use a high voltage probe to monitor Voltage coming from the anode button, if you dont have a HVP then disconnect the CRT board and monitor set.

Jun 26, 2011 | Sony KP-57HW40 57" Rear Projection...

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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 | Televison & Video

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 Televison & Video

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

When a push the power my tv do not want turn on only hear a click noise


This usually indicate a problem with the flyback, or the horizontal output transistor. Most TV problem is not repairable by the user, because of it's complexity. If you like reading, and honestly like to learn on your own, it is not so hard to learn to fix electronic device such as TV. Unfortunately a TV is not something you can look at and figure out how it works. I would suggest start by reading electronic books, preferably the ones with projects to help you learn how electonic device are put together to make a working circuit. The most I can help you with is look for the horizontal output transistor it is square with 3 pins, and is mounted on aluminum heatsink to dissipate heat. One of its pin would be connected to the flyback and the horizontal yoke.(The yoke would be the copper winding on the neck of the tube) be careful you don't touch the thick wire from the flyback to the back of the tube because a tv tube can carry large amount of lethal charge even if not plugged in! Take that transistor out of the circuit and test it with an ohmmeter. Set the meter to "diode" with the transistor facing you. the first pin is the base. Connect the red wire to that then the black pin should read around 0.4 voltage drop it maybe a little highe on the other two pins.. If you get a reading that is low it is shorted out. Note tho that some horizontal output transistor have a resistor connected to the first, and last pin (base emmiter junction) then it gets confusing. If in doubt just replace it. The cost of a horizontal output transistor is around a few bucks. Make sure you buy two of them! If the TV turned on after you raplace it but later failed again. You have to replace the flyback too. This time use your spare transistor along with a new flyback, which cost from 20- 50 dollars. Hope this helps.

Mar 22, 2009 | JVC AV-65WP74 Rear Projection Television

1 Answer

Horizontal Output transistor


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

Feb 04, 2009 | Samsung HCL4715W 47" Rear Projection...

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

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