On Sun, 08 Mar 2009 07:39:59 -0500, Rick wrote:
Franc Zabkar wrote:
On Sun, 08 Mar 2009 13:42:54 +1100, Franc Zabkar
put finger to keyboard and composed:
On Sat, 07 Mar 2009 20:24:17 -0500, Rick put finger
to keyboard and composed:
The IC's are a standard 8 pin DIP
package, 3 of them marked P605 (over) BD6L2P, 1 marked P605 (over)
BD6L2B The trademark on the IC's is a script letter "A" - obviously not
AMD.
The logo belongs to Alpha & Omega Semiconductor, Inc.
The part number is AOP605. It is an N-Channel Complementary
Enhancement Mode Field Effect Transistor, 30V, 7.5A.
Sorry, it's a dual N-channel and P-channel MOSFET.
Available from Digikey for $0.87:
http://parts.digikey.com/1/parts/150...ip-aop605.html
- Franc Zabkar
Thanks Frank! I was at Digikey - how did I miss that?
It looks like a fairly robust part and I'd expect to see a certain
amount of thermal discoloration around those IC's on the circuit board.
The owner swears the damage occurred during a single power on attempt -
says she got nothing at all when she turned the monitor on after it had
been powered off for about a week. No smoke, didn't hear anything.
Unlikely the MOFSET's are damaged since the capacitors - and the fuse -
on the power supply board blew? Any thoughts? (Damned cheap electrolytic
capacitors...)
Rick
This is a common problem with these monitors. Cheap capacitors, poor
ventilation, and suddenly you have a failure. The ususal chain of
events is the caps degrade, resulting in high ripple. Then things
deteriorate from there. I've had many that require only cap
replacement. In one case, the only other problem was a blown fuse in
the inverter. Common symptoms include turning on, then off again;
backlight turns off, then on, backlight won't turn on, fuse blown,
etc.
There is a lot of information on the problem at
http://www.badcaps.net/forum/forumdisplay.php?f=28
Recommendation is to replace ALL electrolytic caps in the power supply
and inverter with Panasonic FC, Nichicon PM or equivalent. You
already mentioned Digi-Key. I was thrilled recently to discover they
no longer have a handling charge for small orders. The caps to redo
two monitors cost less than $10 - delivered.
PlainBill