Question about RCA P52929 52" Rear Projection Television

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NO POWER, Yes blown fuse.

After hurricane Rita come through, and power had been returned to normal, the 5a 250v fuse was blown, replaced and blown again. Up until this point I had NO problems with the TV. Since then have looked vigorously for any possible/obvious component damage. Only one componant was visibly damaged (burnt), a 220ohm resistor, this was replaced, another fuse put in, only to blow another fuse. What am I missing? Help greatly apprecciated! RCA 52" Projection TV Model # P52929 Serial # 111651490 Chassis # PTK195S11B Mfg. March 2001 FYI: After Rita, this happened to nearly ALL electronics in my house, some I have repaired, others still troubleshooting.

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Re: 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

Posted on May 02, 2006

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The first place to start is the outlet and check to be sure it has power. The next is to check / replace the main internal (to the tv) fuse - it's a 5A 250V GMA fuse (google image of GMA fuse). To find the fuse, unplug the set and remove the back cover of the TV - follow the power cord to where it enters - the fuse is located to the right and slightly ahead of where the power cord is attached to the board.

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Continuing questions from Tony Fidaleo

I've sent you an email to request the copy of your PDF file to see what part in the circuit is making the fuse blow.

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Diagnosis 23

Protection cutting in can be caused by many different things, at least half a dozen.

Most of the time on a Mit, this is caused by the conv sys blowing a fuse that operates it, which is the same power supply that keeps the unit on. When that fuse blows, the voltage from the power supply that keeps the set on disappears.

The 5A fuses that keep the plus and minus 24v rails going are little green things that look like resistors, but are actually "IC protectors". They can be replaced by regular 5A fast blow fuses, GMA type (also known as F type - small, and hopefully pigtail, for soldering to the bad fuses. Parallell one or both of them onto the blown little green things after testing each with a VOM, which can be done easily in circuit while the unit is unplugged.

If either of those 5A fuses are blown, chances are you'll need to replace their conv ICs as well.

Mit's will work with their conv ICs disco'd - you'll have no conv correction, but the set will work and you'll see an uncorrected picture. At that point it's a shoe-in that the conv ICs are bad and need to be replaced.

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