Question about RCA HD56W58 56" TV

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Tv dead blows fuse horizontal output transistor shorted

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  • jddenton Sep 01, 2008

    RCA HD56W58 THE PART NUMBER I AM TRYING TO GET OR INFORMATION. P/N 1590395A

  • dwightlikiak Sep 06, 2008

    Turn on tv with remote and power switch but nothing at all. no click sound, no light on, no power at all.

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  • 556 Answers

No problem

replace by same number.

but remember before you replace check the following.

  1. check for normal output from power supply.
  2. check components connected to flyback transformer.like capacitors & diodes.
  3. check for print short.
  4. while replacing h/output be careful to check heat sink compound & mica sheet normal.
  5. put on the set
  6. if still it blows then flyback transformer is faulty.
  7. hope this will help.
  8. good luck.

Posted on Oct 12, 2007

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1 Answer

HOW TO FIXS HITACHI TV WONT COME ON RED LIGHT FLASHING PROJECTION TVI


model number?little more info...first thing check for short in power and
horizontal output transistor-common problem.also bad connection
cap in horizontal output circuit can cause blown fuse

May 28, 2014 | Hitachi Televison & Video

1 Answer

Fuse in power section blow, replaced large cap and diode,but when pluged in, fuse blows again. what should I lood for?


if this an standard crt type tv, the cause either the regulator transistor or horizontal output transistor has shorted pin junction.

Jul 27, 2012 | Televison & Video

1 Answer

Fuses keep blowing out


Check first for dead short in the power supply and then for dead short to ground at horizontal output transistor collector.

Apr 10, 2012 | GE 25GT240 25" TV

1 Answer

Tv wont turn on?


Hello,
first you have to open the back cover of the television to check for blown fuses.

A blown fuse is a very common type of fault due to poor design very often triggered by power surges due to outages. However, the most likely parts to short are easily tested, usually in-circuit, with an ohmmeter and then easily removed to confirm.

Note that it *may be* useful to replace a fuse the *first* time it blows (though it would be better to do some basic checks for shorted components first as there is a small chance that having a fuse blow the second time could result in additional damage which would further complicate the troubleshooting process). However, if the new one blows, there is a real problem and the only use in feeding the TV fuses will be to keep the fuse manufacturer in business!

Sometimes, a fuse will just die of old age or be zapped by a power surge that caused no damage to the rest of the TV. However, it must be an EXACT replacement (including slo-blow if that is what was there originally). Else, there could be safety issues (e.g., fire hazard or equipment damage from too large a current rating) or you could be chasing a non-existent problem (e.g., if the new fuse is not slo-blow and is blown by the degauss circuit inrush current but nothing is actually wrong).

If the fuse really blows absolutely instantly with no indication that the circuits are functioning (no high pitched horizontal deflection whine (if your dog hides under the couch whenever the TV is turned on, deflection is probably working).) then this points to a short somewhere quite near the AC power input. The most common places would be:

Degauss Posistor - very likely.
Horizontal output transistor.
Power supply regulator if there is one.
Power supply chopper (switchmode) transistor if there is one.
Diode(s) in main bridge
Main filter capacitor(s).

You should be able to eliminate these one by one.



Test the rectifiers individually or remove and retest the resistance.


If these test good, use an ohmmeter with the set unplugged to measure the horizontal output transistor. Even better to remove it and measure it.

C-E should be high in at least one direction.
B-E may be high or around 50 ohms but should not be near 0.

If any readings are under 5 ohms, the transistor is bad. The parts sources listed at the end of this document will have suitable replacements.

If the HOT tests bad, try powering the set first with your light bulb and if it just flashes once when the capacitor is charging, then put a fuse in and try it. The fuse should not blow with the transistor removed.

Of course, not much else will work either.

If it tests good, power the set without the transistor and see what happens. If the fuse does not blow, then with the good transistor (assuming it is not failing under load), it would mean that there is some problem with the driving circuits possibly or with the feedback from the voltages derived from the horizontal not regulating properly.

Look inside the TV and see if you can locate any other large power transistors in metal (TO3) cans or plastic (TOP3) cases. There may be a separate transistor that does the low voltage regulation or a separate regulator IC. Some TVs have a switchmode power supply that runs off a different transistor than the HOT. There is a chance that one of these may be bad. If it is a simple transistor, the same ohmmeter check should be performed.

If none of this proves fruitful, it may be time to try to locate a schematic.

A blown fuse is a very common type of fault due to poor design very often triggered by power surges due to outages or lightning storms. However, the most likely parts to short are easily tested, usually in-circuit, with an ohmmeter and then easily removed to confirm.
But if otherwise your power supply board is dead, It can be dead at anytimes.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Hope this helps....

.

Jun 05, 2010 | Zenith R57W46 57" Rear Projection...

1 Answer

Every time i change the fuse it blows up


You have a shorted Horizontal Output transistor and a bad capacitor or two. Look for a bad resistor and you may have a bad flyback transformer [rare]. But yes the transistor is down!

Apr 11, 2010 | Zenith B25A02Z TV

1 Answer

Changed the fuse but it blows again


check the horizontal output transistor for short.

Apr 06, 2010 | Sharp 25R-S100 25" TV

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

Dead set!


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

Jul 30, 2008 | Televison & Video

2 Answers

TV KEEPS BLOWING FUSES


means you have a part that is dead shorted after the line fuse, usually a bridge diode, regulator IC or possibly the Horizontal output transistor. Not really something a non tech will be able to find, a volt Ohm meter is required as well as soldering equipment.

Nov 27, 2007 | Panasonic CT-36G34 36" TV

2 Answers

RCA big screen tv


whenever fuse blows every time it is the indication of short circuit in tv. so please do not put fuse unless you know the cause of blowing fuse. these are the reasons of blowing fuse. 1 main filter cap.short. 2 rectifier diode short. 3 swithing transistor short 4 horizontal output transistor short 5 caps & diodes connected to flyback transformer short. 6 print short. 7 at last if every thing ok then flyback transformer defective. hope this will help. if you are not a tech person call skilled tech to fix it. good luck

Sep 24, 2007 | RCA P60828 TV

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