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Old 12-27-2011, 12:55 AM   #1
mazade
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Lightbulb Secondary MCP61PM-HM issue & my work-around

This will be the second MCP61PM-HM motherboard that I've received(deliberately) and recapped with good results... yet there is still an issue which seems to have lingered on one board, but perhaps both(will find out this week I hope).

1. the System Fan plug is only putting out 5V on the + , not the 12V that it should be. Fan will not run, and system constantly gives the "System Fan Has Failed" message upon boot-up.
2. CPU fan plug is not putting out full 12V either, but I have a harder time checking the actual voltage put out since the system will shut down if it receives no fan RPM signal on the CPU fan connector(i.e. unplugging connector to check voltage when motherboard is in the case). In this case though the CPU fan spins, but it is noticeably slow(enough to cause concern).

My best guess, and yes that's all it comes down to, is that the nearby WM772L transistor/IC has somehow failed; both the CPU and System fan connectors get their + power through one of those chips(theres 2 of these chips total). Unfortunately I cannot come across any information(data sheets) on that chip number, not to mention finding a replacement.

For the System Fan function I just nabbed 12V from a nearby surface mount resistor/fuse with the black markings on a white background "P" "150-24", and also made certain that the WM772L chip was no longer connected to the + power lead of the System Fan connector.
I basically did the same thing for the CPU Fan connector, except this time I couldn't locate +12V on most things nearby, and thus I grabbed power direct from the 24-pin power supply input(pins 19 & 21 are good 12V pins). I ran a 20ga wire on the underside of the board between the supply input and the CPU Fan + input; also remembering to break the connection between the failing IC and the + input(nearby SMD resistor).
Results: no "System Fan Has Failed" message, and the CPU Fan spins as fast as it should(IMHO - much faster than before).

Now I just need to find out if this issue also is occurring on the first MCP61PM-HM that I re-capped.

Pictures to follow.

Also, I did mount a small 12V fan to the chipset heatsink, I do not trust this thing to run warm for too long considering all the potential fail issues of the Nvidia chipsets.... at least now that it's part of my collection
Heheh, Legacy OS 2 live CD boots up just fine in with XVesa...

Last edited by mazade; 12-27-2011 at 12:58 AM..
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Old 12-27-2011, 12:59 AM   #2
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Default Re: Secondary MCP61PM-HM issue & my work-around

That board temperature controls the fans, so 5V is perfectly normal.
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Old 12-27-2011, 09:34 AM   #3
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Default Re: Secondary MCP61PM-HM issue & my work-around

Really? Well, why would the "system fan" not spin at all? It's a small crossflow fan, and the 5V that's being input doesn't even begin to turn it over...
The CPU fan spun so weak that it would hardly move, and if it was stopped(by a finger or something) it wouldn't even start back up on its own.
Perhaps you're right about that, but yikes!
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Old 12-27-2011, 10:55 AM   #4
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Default Re: Secondary MCP61PM-HM issue & my work-around

^
because you have the case fan plugged into the wrong header. Been there done that, I see these boards all the time.

Yes, the fans are temp controlled. then spinning slow is perfectly normal. As the system heats up, the temp control spins the fans up faster.
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Old 12-27-2011, 11:07 AM   #5
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Default Re: Secondary MCP61PM-HM issue & my work-around

You are using 3-wire fans with tach's,, right?
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Old 12-27-2011, 11:27 AM   #6
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Default Re: Secondary MCP61PM-HM issue & my work-around

^

Well that too...
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Old 12-27-2011, 03:08 PM   #7
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Default Re: Secondary MCP61PM-HM issue & my work-around

Quote:
Originally Posted by mazade View Post
Really? Well, why would the "system fan" not spin at all? It's a small crossflow fan, and the 5V that's being input doesn't even begin to turn it over...
Wait... A crossflow (hamster wheel) fan? that's not the original HP fan then. That might explain it. The HP fans usually rev really fast at 12V (5000+ RPM) and sound like jet engines. 5V spins them at around 700-800RPM.
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Old 12-27-2011, 10:55 PM   #8
mazade
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Default Re: Secondary MCP61PM-HM issue & my work-around

I have this board out of its original case and all, just picked it up bare on ebay for cheap.
OK... so I'm a dupe regarding their weird setup...
I just dont like the thought of that thing being able to heat up, at all, especially with that sensitive Nvidia chipset that doesn't have any active cooling for it
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