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No start, horizontal amp shorted - Televison & Video

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Whats the model number?

Posted on May 22, 2008

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Power goes off when truned on


Hello
The power supply starts ON and suts down immedieatly, means there is some short circuit with its main board. In most cases Horizontal output section will have the shorted component/s. You must ahve knoledge in electronics, and experience in troubleshooting the horizontal output section of your set.

Feb 15, 2012 | Mitsubishi WS-55819 55" Rear Projection...

1 Answer

21" sony tv horizontal amp short what is the


Hi,
The most common cause of this symptom, by far, is the loss of vertical deflection amplifier. It usually requires the replacement of the vertical output transistor or some component associated with it. The cost of repair would run around $150 to $200 depending on the exact parts replacement and the shop that does the work.

i hope this will be help full to you .
goodluck

Feb 02, 2011 | Sony Grand WEGA KF50WE610 50" Rear...

1 Answer

Hitachi 51f59a lost picture powers up and can hear sound amp come on when turned on and off but no picture


You may have a shorted horizontal output transistor. This transistor drives the high voltage transformer which in turn drives the picture tubes. High voltage can be dangerous so you may want to have a repair shop check it out for you. Also have them apply a bead of silicon around the anode caps on the picture tubes. This will prevent high voltage leaking out and causing the horizontal output to short again. Thanks

Oct 27, 2009 | Hitachi 51F59 51" HDTV Projection...

1 Answer

Hitachi 60SDX88BA


no picture condition could be caused by a problem in the horizontal deflection circuit or a power supply failure. A horizontal deflection problem often are followed by open fuses due to shorted components such as a h.o. transistor ofcourse there are a lot more componentd that constitute this circuit. Another no picture condition could be caused by defective convergence power amps. these amps usually give an clear indicator when they are about to quit(color curved or missaligned, double color images etc.) this is a common problem with projection tvs and that is where I would tell the tv tech to start looking.

Sep 19, 2009 | Hitachi 60SDX88B 60" Rear Projection...

1 Answer

TV has sound but the screen looks like it is going out has double, colors green, yellow, red. Went off by itself once. Wavy looking. Smelled burning in back, when it went off by itself.


you're describing a power convergence amp problem, usually starts out at random color shdes or gohsts around the images more noticeable on scenes with letters or horizontal and vertical lines. the power amps overheat and sometimes will short out causing the fusible resistors to burn out. these amps are usually mounted on heavy metal dissipation units in one of the main boards.

Jul 30, 2009 | Samsung Televison & Video

1 Answer

Blinking power light & black screen on toshiba 57h81


This TV could have one of several problems including but not limited to; convergence IC's,bad capacitors, shorted horizontal output transistor. Call a good TV Tech. Check with the BBB before you decide on one.

Jul 11, 2009 | Toshiba 57H81 57" Rear Projection...

3 Answers

HORIZONTAL OUTPUT TRNSISTOR SHORTS WHEN POWER ON TV


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
  • remember:
  • 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.

Apr 15, 2009 | Televison & Video

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

1 Answer

Sreekidu


Sounds like a common problem where the Horizontal Output Transistor shorts due to heat, loading by a partially shorted flyback or yoke or old dried heat sink2.gif compound.
or could be convergance amp ic's

Dec 18, 2007 | Pioneer SD-533HD5 53" Rear Projection HDTV

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