1st of all, I am not a parts changer, I need someone with experience on the M5641 ACER M/B.
I came upon this M/B a few weeks ago and have similar problems to others but have found no one with any good fixes, tips or suggestions other than changing the board.
This board came to me with a few questionable capacitors which I have since changed.
Yesterday I purchased a E2200 Intel processor and tried the board.
1. The board is very picky about memory. Seem to like 800Mhz. sticks. and does not like mixing 667 with the 800 pcs.
XXXX This is what the board does XXXX
The first time I tried the unit I had No Video signal to monitor but had action on CPU Fan, DVD, HD and USB ports. Even got a Beep on Post.
2. Being that this was a new installation and needed to see the Device manager, I went ahead with a new O/S Install. ( Win7 )
Everything loaded with No Problems and the Device Mang. was clean.
3. I went to ACER and down loaded all current drivers and BIOS updates. Everything went grate until I shut down system completely and powered back up.
*** This is where it gets sticky. ***
A. Powered up unit and all worked except the display video. Message No Signal.
B. I checked the board for Hot Spots ( Over heated ICs ) found all OK.
C. Removed the memory, CMOS battery, CPU fan and CPU and then disconnected the Power Supply. Re-Connected all the above and System fired back up.
$$$ Shut down system again and the same No Signal to Display comes up. $$$
Now I know this can be figured out.... I have changed the supply and Tried a Video card.. Still the same...
I am thinking about changing the BIOS settings to disable onboard video.
This is almost like a Bad Cap or IC but don't really see anything outstanding to change...
This is a M5641-B5560A board or MCP73PV.
I don't think it's the GPU because other system resources have not failed in the time it took to load Win7. and drivers. I have seen the loose of WiFi, sound and display distortion with GPU failure on Laptops but this is a Desktop unit.!
Anyone with any Technical Ideas, Please feel welcome to thru one in.
OK, absolutely No Response from the viewers.
Here is an update... 8-14-12
I have removed the power supply after watching the voltage on the 12V plus ( 4-pin CPU connection. )
While loading Win7, I noticed and small flux. on in the CPU voltages.. BIOS showed a voltage of 11.96 but volt meter showed a drop at heavy Hard Drive and CPU usage ( down to about 11.93 Avg. )
All my other voltages 3.5 and 5 volt are consistent.
I figured, what the hell, I've got several other 350 to 525 Watt supply's, so let see if I find the same drop in voltage.
That seemed to take care of the voltage flux. but still have the Display issues..
I removed the additional VGA card and tried the HDMI connection, for some reason, it works every time.
I can see No Way to disable the internal VGA in the BIOS, so I am still at a lose.
The VGA works with the add-on card but will not work with the onboard video, unless it sits for some time.
I think it may be something in the BIOS, so I am going to research AMI for updates away from ACER.
Unit works fine with the HDMI, just can't figure out where the problem is.