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5v rail is measuring around 11v

 
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joby201



Joined: 21 Sep 2009
Posts: 5

PostPosted: Sun Oct 18, 2009 3:14 pm    Post subject: 5v rail is measuring around 11v Reply with quote

which component failure would cause this to happen? any help would be appreciated.

thanks, ty
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Mon Oct 19, 2009 2:51 pm    Post subject: Reply with quote

That depends on which kind of equipment it is and how the +5V rail is supplied.
Typically, a such fault could be due to a short circuited series pass transistor of a linear voltage regulator or buck type switched regulator. Or it could be due to a voltage regulation problem or lost ground reference for any type of regulator.
Another possibility is a short circuit from the +5V to a higher voltage somewhere in the equipment.
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joby201



Joined: 21 Sep 2009
Posts: 5

PostPosted: Tue Oct 20, 2009 3:01 am    Post subject: Reply with quote

based on the possibilties you gave me, i think its a shorted transistor. does that sound accurate for a power supply for a plasma tv? unfortunately, i jumped headfirst into this and forgot some basics. by shorting whatever i did, i multiplied my problems. now i have, at the very least, several fuses to replace and at worst fried some ics. thanks for the reply
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