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Sharp 25VTJ100 blows power diodes    
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larryalso



Joined: 16 Feb 2011
Posts: 5
Location: DC

PostPosted: Wed Feb 16, 2011 8:06 pm    Post subject: Sharp 25VTJ100 blows power diodes Reply with quote

Sad

Sharp 25VTJ100

Set comes on, good picture, good sound, no hum, no distortions, all functions work, BUT,

after a few seconds, one of the 2 power diodes gets REAL HOT and the set dies! Diode is fried, replacement did the same.

Suggestions?
Where might I find a schematic for this old set?
Google

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JTS1957



Joined: 21 Jan 2009
Posts: 2328
Location: Far, Far Away

PostPosted: Thu Feb 17, 2011 4:27 am    Post subject: Reply with quote

Can we be a little bit more specific?

"one of the 2 power diodes gets REAL HOT and the set dies! Diode is fried, replacement did the same." As in one of the four diodes (D701 - D704) of the power supply bridge? Not taking out fuse?

http://elektrotanya.com/sharp_25vtcj10_tv.pdf/download.html
larryalso



Joined: 16 Feb 2011
Posts: 5
Location: DC

PostPosted: Thu Feb 17, 2011 10:41 am    Post subject: More specific Reply with quote

At the back centerish of the pcb are TWO large diodes, about 3 to 5 Amp size, one of these, the right I recall is the one failing, the other doesn't get hot at all.

No, the fuse, or breaker does not blow.

My suspicion would be a focus transistor going south but I have no schematic and insufficient time to "finger" test it if/when I find it. Could be a filter cap but I would expect other indications (distortions) if it were.

Confused

I have replaced the failing diode with two parallel diodes but don't want to fry anything else, and yes, they get hot rather fast too. I use on 10 sec/off 60 so things are slow.

Anywhere I can download a schematic?

Larry
larryalso



Joined: 16 Feb 2011
Posts: 5
Location: DC

PostPosted: Thu Feb 17, 2011 10:54 am    Post subject: download problems Reply with quote

Confused

Thanks for the URL for the manual. HOWEVER, even though I have a PDF reader installed, the site refuses to download the manual without first downloading the Nuance PDF reader, TILT since I am not authorized to install software on this machine. Is there any workaround?????

Larry
JTS1957



Joined: 21 Jan 2009
Posts: 2328
Location: Far, Far Away

PostPosted: Thu Feb 17, 2011 11:55 am    Post subject: Reply with quote

Each part mounted on PC board should have a location/ID number assigned to it.

Most people press "GET MANUAL." Adobe reader should work.
Google

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larryalso



Joined: 16 Feb 2011
Posts: 5
Location: DC

PostPosted: Thu Feb 17, 2011 3:10 pm    Post subject: Reply with quote

I'll take a look at the componant ID when I get home tonight.

When I klik on "get manual", it goes to the PDF reader download page even though I have already the A----e 9 reader on this machine. Sure would like to get that manual though, could you attach it to an e-mail to me?

Larry
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