Question about Philips Magnavox 42MF521D/37 Television

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Blown fuse in set

Dear sir: I have a 42" Mganavox LCD that is just 3 years of age. It had been trouble free up to one afternoon, and "POP" and the whole unit went down. Being out of warranty, and a bit of a handyman, I pulled the back panel and circiuot card and discovered a blown fuse: 250V5A slow blow...I replaced it and reconnected the power...and again it popped the fuse! I have a novice tech that looked it over and checked the capacitors for swelling. they are fine. he is not sure what additional damage there might be without digging more. Is this unit worth taking to a shop and paying the repair bill? It retailed new at near $1400. I can replace it for under $900 same size, or downsize until prices drop even more. Thankyou for your time

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Seems to be a fualty circut board or some of the circut components gone bad. they can replace or repair them at least untill the tv,s go down a bit more in price i would get the estimates then decide. if it was the screen it self cracked or broken then i would tell you to go for a new tv.

Posted on Dec 16, 2008

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1. IF sound main fuse/s are good.
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Here is a general answer:

I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have tobuy and try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.

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