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 | 
|
| 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
Note model numbers and board revisions here
| 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
Basic PCB Name
| RefDes | Qty | Compatible Part Number | Order Links |
|---|---|---|---|
| EC30, EC71, EC41, EC45, EC57, EC54 | 6 | OST RLX 6.3v Caps | LCSC |
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.