Acer Aspire M1641

This device is in the WorkNeeded:OriginalParts category because it was flagged as missing information on the original parts. It may have replacement parts listed but those cannot be assumed to be identical to the originals. If you have a list of the original parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables

Acer M1641 Motherboard

Preliminary Information
Release Year	2009
Leak Risk	High
Batteries	CR232 Clock Backup
Mounting Technology	Through Hole, SMD, Sockets
Capacitor Types	Aluminum Electrolytic, Polymer
Destructive Entry	No

Non-named motherboard from late 00s mATX PC available in multiple configurations, usually shipped with Vista or Windows 7, intended for home use. Motherboard appears with the same PCB in multiple other component configurations on other late-2000s Aspire M desktop PCs, however study may be non-transferrible.

Uses nVidia nForce 7050 chipset, known to reject some normally-valid configurations.

Known Issues

No boot after changing RAM

Causes

• Total RAM added exceeds 4GB
• RAM exceeds 2GB per DIMM
• Total RAM exceeds 3GB (under certain bios configurations)
• RAM rated speed is too high

Solutions

• Reduce total RAM
• Use matched DIMMs
• Use a 1GB DIMM and a 2GB DIMM, please fill out info if you can identify which bios setting causes this
• Try DDR2-800 RAM, the system may fail to boot if the RAM reports being too capable in some cases

OS Not Recognizing Working PCIe Expansion Device

Causes

• The nForce 7050 chip's limited PCIe stability and compliance is affecting your new expansion device
• Capacitor degradation is causing the device to be rejected

Solutions

• Use a different expansion device
• Recap

Disassembly Notes

CR232 clock battery is held in with a spring clip that may be live if the battery has charge.

Expansion cards are installed, from factory, using a metal bar which will usually be sharp.

Front drive cage is positioned in a way where it may be necessary to remove all internal drives before removing the motherboard, if there is any obstruction this is greatly recommended as the factory drive installation points will cause the drive to hit a leak-danger cap near the floppy port, or (on lower chance) three leak-danger caps next to the RAM slots.

Original Parts

Possible leak-risk caps

AE caps which are at particular danger of leaking

Capacitor Specifications and Footprint Information

RefDes	Qty	Capacitance	Voltage	Mount	Diameter	Height	Lead Spacing	Temp	Type	Brand	Series	Notes
EC30, EC71, EC41, EC45, EC57, EC54	6	1000 µF	6.3v	Through-hole	8mm*	16mm*	3.5mm*	-40~105 °C	Aluminum Electrolytic	OST	RLX	High leak risk, low-ESR, navy and gold
EC28, EC29, EC25, EC26, EC72, EC73, EC74	7	1000 µF	6.3v	Through-hole	8mm*	16mm*	3.5mm*	105 °C	Aluminum Electrolytic	Panasonic		Likely higher-ESR, black and grey
EC69, EC68, EC43, EC31, EC33	5	470 µF	16v	Through-hole	8mm	11.5mm	3.5mm	-40~105 °C	Aluminum Electrolytic	United	KZG	Low-ESR, brown and grey

Measurements with an asterisk are gleaned through measurement, rather than manufacturer specification, and may be imprecise.

Replacement Parts

Problem Cap Replacements

Capacitors

RefDes	Qty	Compatible Part Number	New Part Type	Order Links
EC30, EC71, EC41, EC45, EC57, EC54	6	OST RLX 6.3v Caps	Aluminum Electrolytic	LCSC
EC30, EC71, EC41, EC45, EC57, EC54	6	OST RLX 6.3v Caps	Polymer	Digikey

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.