Question about Akai PT5598HD 55" Rear Projection HDTV-Ready Television

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Keeps blowing fuse

This tv was damaged by a power surge from a downed power line. I have replaced the 6.3 amp fuse located near the power cord twice. Any ideas...Where can I find another board?

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CHANGED THE BRIDGE RECTIFIER

Posted on May 11, 2009

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You will probably be replacing boards left and right with a surge. I would make a claim with the insurance company, it's covered under most home owner's insurance.

Posted on Jan 12, 2009

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How many amps is the fuse that is located on the back of the TV near the power cord. It says T5AL/125 or 250 v. f800


Something else is going on to cause the fuse to keep blowing. Sounds like you have an issue on your power supply in the unit. Also check the outlet that your plugging it in to. Good luck!

Jun 28, 2012 | Zenith E44W46LCD 44" Rear Projection...

1 Answer

I have a RCA HD50LPW175 TV and it keeps blowing the 6-Amp fuse125v. Why?


Either you have a dead short or you used the wrong fuse--not all 6a fuses are the same---buy a cheap generic one from Radio shack etc and it can blow for no reason.

If not the wrong fuse---the fuse you are talking about should be where power enters the set--means a short on primary side of set's power supply---somewhere between power cord and input side----possible the bridge rectifier is shorted.

l have usually seen this when there was a power outage or a surge on the incoming power line.

May 28, 2012 | RCA Projection Televisions

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

Hello, I have been having power problems with my Samsung FPT5084 50" plasma for the past year. I know what the problem is,m just don't know how to fix it. My TV keeps blowing fuses. I bought 10 12A 250V...


I would have maintenance from your building come out or the electric company and put a monitor on the 110v line into your apartment to make sure the ground strap is not coming loose in which your voltage will rise in excess of 150 volts.
As far as I see, your AC line fuse is only a 6 amp. Why are you using a 12 amp? If you have a circuit board ID number of the fuse your replacing, that would be helpful. I know of no Plasma set that uses a 12 amp fuse, not even old heavy current draw sets of yester year. You can e-mail me at jmk2938@gmail.com

Nov 28, 2009 | Projection Televisions

1 Answer

I had a power outage and now the tv will not power on. This is for a 55" Mitsubishi WS-55511. no green blinking lights.


Hi,

You may have a blown fuse. Unplug the TV and remove the back. Look for a small fuse near where the power cord goes in.
If it is blown that may be the problem.
Use a magnifying glass to read the AMP rating.
replace the fuse and plug it in. If the fuse blows again you need expert repair services.

If the fuse doesn't blow then try to turn it on.
If it turns on then check the operation of the TV.

If the fuse blows again or the TV won't work correctly then you need expert repair service to fix your TV.

You may be able to have your household insurance pay if it is damaged by lightening or a power surge.

Lee

May 02, 2009 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

Tv will not power up when turned on after a power surge occurred.


Prayfully the fuse inside the tv took a little shock and broke ...if not that would leave the transformer or the board took a surge also but this would also depend on a little more details...

was the power surge damaged?
was tv plug damaged?
does the power surge still work (if it wasn't damage)
and not all power surges are power surges unless it specified of purchase most are like power surges but are only close to and a extended extention cord updated..

if the power surge is damaged or even still works then go have the fuse check and any further damage will also show up on the board it will have a burned part...

Nov 11, 2008 | Projection Televisions

1 Answer

Have a Toshiba MW24F11 combo tv. Near lightning strike through surge suppressor. Will not turn on. 6.3 amp fuse blown; replace, blew again. Next step, or start looking for replacement. Set is 25...


power surges generally damage diodes and capacitors causing the fuse to blow, any reputable tv shop can repair for a fraction of replacing this set.

Sep 15, 2008 | Projection Televisions

1 Answer

Blown fuse


Most likely there was a power event (surge, brownout, ect) that caused the power supply to fail in the TV causing the fuse to blow. you will need to have someone come and look at the unit and give you an estimate. If you keep putting fuses in and blowing them you could actually be causing more damage.

Mar 10, 2008 | Projection Televisions

2 Answers

Instantly blows the 5 amp fuse next to the power cord plug.


You have a short in the power supply. Look at the regulator and or rectifier diodes. These are all on th primary side of the SMPS (switched mode power supply) the secondary side if shorted shouldn't cause a blown fuse at all.

Mar 18, 2007 | Mitsubishi VS-50607 50" Rear Projection...

1 Answer

NO POWER, Yes blown fuse.


Was this the 220 ohm in the power supply??? and if the 5 amp blew right away then it probably took out the bridge rectifyer with the power surge that comes alog with hurricane damage to the power lines as I used to live in florida and repaired lots of sets damaged from storms!! After you check the bridge rectifyers I would start looking to find any other shorts. First measure across the ac line with the fuse replaced but not plugedf in . If its shorted check what I mentioned before if its good after you replace the shorted parts you maybe in luck. need more assistance go to sams photo facts download a schematic and we will trouble shoot this together if you post it here so i can look at it. good luck

May 02, 2006 | RCA P52929 52" Rear Projection Television

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