| Author |
Message |
larryalso
Joined: 16 Feb 2011
Posts: 5
Location: DC
|
 Posted: Wed Feb 16, 2011 8:06 pm Post subject: Sharp 25VTJ100 blows power diodes |
 |
|
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
|
 Post subject: Advertisement |
|
|
|
|
JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
|
| Posted: Thu Feb 17, 2011 4:27 am Post subject: |
|
|
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
|
| Posted: Thu Feb 17, 2011 10:41 am Post subject: More specific |
|
|
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.
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
|
| Posted: Thu Feb 17, 2011 10:54 am Post subject: download problems |
|
|
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: 2395
Location: Far, Far Away
|
| Posted: Thu Feb 17, 2011 11:55 am Post subject: |
|
|
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
|
| Post subject: Advertisement |
|
|
|
|
larryalso
Joined: 16 Feb 2011
Posts: 5
Location: DC
|
| Posted: Thu Feb 17, 2011 3:10 pm Post subject: |
|
|
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 |
|
|
|
FAQ
Search
Register
Log in
