5000 Series Power Supply Repair - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 4 Old 04-08-2011, 03:18 PM - Thread Starter
Member
 
brobin's Avatar
 
Join Date: Dec 2001
Location: Hawaii
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
As evidenced by a failure to boot at all, no video output, a stopped fan and particularly with Mikeyboy's diagnostic advice, I found myself with a power supply that suffered from the somewhat typical problem of being a volt low on the yellow wires to the motherboard (2.3 instead of 3.3 volts). After removing the PS board I looked closely to see if there was any obvious cause of the failure - and there was!
The capacitor located just inboard of the coil had a very small hole in the top right at the intersection of the X scored on the top. That scored X is there to provide a weak spot for a cap to pop when it fails and it worked as designed. That particular cap is a 2200mfd 10v electrolytic. Basic soldering skills are all that's required to change the cap which is available at any well stocked electronics shop (cost $2). Use some desoldering wick to remove the bad cap and solder in the new one being sure to observe polarity - the negative side to the shaded hole - and you're good to go.
brobin is offline  
Sponsored Links
Advertisement
 
post #2 of 4 Old 04-09-2011, 08:48 AM
AVS Special Member
 
replayrob's Avatar
 
Join Date: Mar 2005
Location: NY- The tax State
Posts: 4,163
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 183 Post(s)
Liked: 186
I pays to be handy with a soldering iron- and some knowledge!

"If we ain't outta here in ten minutes, we won't need no rocket to fly through space."
replayrob is online now  
post #3 of 4 Old 05-08-2011, 07:10 AM
Member
 
Lark888's Avatar
 
Join Date: Feb 2004
Posts: 117
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
The electrolytic caps do have a finite lifetime. At work, we have a ten-year replacement program for these capacitors on our older control systems and power supplies. It is not that the caps will fail at ten-years, just that their reliability starts to degrade somewhere at 10+ years. However, I expect that we will see more units with bad caps in the next 3-5 years.

I have lost 3-4 motherboards made in the early 2000s to this failure mode. It is interesting to note the my motherboards from earlier are still working fine ( for example, a 1995 IBM Aptiva that I use for running rehearsal scores when my spouse directs theatrical productions)
Lark888 is offline  
post #4 of 4 Old 05-08-2011, 05:18 PM
Member
 
srfrdan's Avatar
 
Join Date: Mar 2010
Location: jersey shore
Posts: 162
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 13
Quote:
Originally Posted by brobin View Post

As evidenced by a failure to boot at all, no video output, a stopped fan and particularly with Mikeyboy's diagnostic advice, I found myself with a power supply that suffered from the somewhat typical problem of being a volt low on the yellow wires to the motherboard (2.3 instead of 3.3 volts). After removing the PS board I looked closely to see if there was any obvious cause of the failure - and there was!
The capacitor located just inboard of the coil had a very small hole in the top right at the intersection of the X scored on the top. That scored X is there to provide a weak spot for a cap to pop when it fails and it worked as designed. That particular cap is a 2200mfd 10v electrolytic. Basic soldering skills are all that's required to change the cap which is available at any well stocked electronics shop (cost $2). Use some desoldering wick to remove the bad cap and solder in the new one being sure to observe polarity - the negative side to the shaded hole - and you're good to go.

good catch. ill check that on one i have from ebay that igot for parts. its got lifetime service. dan
srfrdan is offline  
Reply ReplayTV & Showstopper PVRs

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off