Background
========
I recently received 4 socket 775 motherboards that were stripped bare (not even the 3V battery was included). The person who gave them to me said they "should all work". Well, after buying some used DDR2 memory and a couple of used Intel Core 2 Duo CPUs (E6300 and E6320), I managed to fix the Asus P5B-E board by replacing one obviously bloated KZG 820uf 6.3vcapacitor. The Asus P5B-E posts okay now. Before the recap, it would not post or power on. So now I have a known working power supply, CPUs, and memory to use for testing the 3 other motherboards. Onto the first motherboard below.
Motherboard
========
This is an Acer M5640 board made by Microstar. It will not POST. Specs are at
Service manual at
http://www.manualowl.com/p/Acer%20Co...0/Manual/65473
Symptoms
=======
I have no idea what the history of these boards are.
- HSF fan spins and never stops
- no beeps
- no display
- no POST
Tests done so far
===========
Here is what I have tested so far and found. All resulted in no beeps and no POST.
- all tests done below with the motherboard "bread boarded" (that is, out of the case sitting on a cardboard box)
- installed new 3V battery (measures 3.13V DC on multimeter)
- cleared CMOS battery by removing it for a hour and tried moving the clear CMOS jumper
- all voltages on PSU are within spec
- all voltages on the motherboard around the CPU, southbridge, and northbridge appear normal (1.3V around vcore, 1.8V DC around DIMM)
- installed known working Intel E6300 CPU (supported by motherboard according to Acer specifications)
- installed known working Kingston 512MB DDR2 memory
- tried AMI BIOS recovery method listed at http://biosman.com/biosrecovery.html (however no floppy access/lights no USB drive access/lights)
- keyboard (num, caps, and scroll lock) all light up initially and then go out (after that, it seems that the keyboard does not work)
- tried one DIMM in slot 1 and then slot 2 and get no beep
- tried removing all DDR memory and I still get no beep
- all caps are either Nichicon HM(N) 2008 date code, or Panasonic FL
- turn the board on an off by shorting out the power sw pins (this suggests that southbridge is partially working?)
- tried known working video adapter in addition to onboard video
Question
======
Is there anything to try and make this board work?
========
I recently received 4 socket 775 motherboards that were stripped bare (not even the 3V battery was included). The person who gave them to me said they "should all work". Well, after buying some used DDR2 memory and a couple of used Intel Core 2 Duo CPUs (E6300 and E6320), I managed to fix the Asus P5B-E board by replacing one obviously bloated KZG 820uf 6.3vcapacitor. The Asus P5B-E posts okay now. Before the recap, it would not post or power on. So now I have a known working power supply, CPUs, and memory to use for testing the 3 other motherboards. Onto the first motherboard below.
Motherboard
========
This is an Acer M5640 board made by Microstar. It will not POST. Specs are at
Service manual at
http://www.manualowl.com/p/Acer%20Co...0/Manual/65473
Symptoms
=======
I have no idea what the history of these boards are.
- HSF fan spins and never stops
- no beeps
- no display
- no POST
Tests done so far
===========
Here is what I have tested so far and found. All resulted in no beeps and no POST.
- all tests done below with the motherboard "bread boarded" (that is, out of the case sitting on a cardboard box)
- installed new 3V battery (measures 3.13V DC on multimeter)
- cleared CMOS battery by removing it for a hour and tried moving the clear CMOS jumper
- all voltages on PSU are within spec
- all voltages on the motherboard around the CPU, southbridge, and northbridge appear normal (1.3V around vcore, 1.8V DC around DIMM)
- installed known working Intel E6300 CPU (supported by motherboard according to Acer specifications)
- installed known working Kingston 512MB DDR2 memory
- tried AMI BIOS recovery method listed at http://biosman.com/biosrecovery.html (however no floppy access/lights no USB drive access/lights)
- keyboard (num, caps, and scroll lock) all light up initially and then go out (after that, it seems that the keyboard does not work)
- tried one DIMM in slot 1 and then slot 2 and get no beep
- tried removing all DDR memory and I still get no beep
- all caps are either Nichicon HM(N) 2008 date code, or Panasonic FL
- turn the board on an off by shorting out the power sw pins (this suggests that southbridge is partially working?)
- tried known working video adapter in addition to onboard video
Question
======
Is there anything to try and make this board work?
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