STRANGE MOUSE PROBLEM MSI K9N NEO (MS-7260 V1.0)
There is no +5v on mouse clock pin (MCLK) but only 0.12V.
Mouse MDAT present with 5V and Keyboard KDAT and KCLK also normal +5V.
From PS2 connector signal is going to capacitor and throug him to null, and resistor 10k which is connected to WINBOND W83627EHG MCLK pin 65.
I changed W83627EHG, capacitor, resistor 10k but nothing changed.
Then, I noticed that +5V on MCLK is showing only when I turn on MOBO without processor present in MOBO !?!!!!!
How this can afect that I voltage drops from +5 to +0.12V?
Also, MOBO is turning on normaly and booting windows, instaling drivers, runing tests etc... All without mouse of course:) In windows,when i put mouse in ps2, mouse pointer is jumping from side to side and klicking randomly. Also, USB mouse isn`t working at all.
Only thing that also isn`t working is that can`t boot from floppy drive (same situation was before changing SIO).
Прошивка и настройка BIOS, переделка и ремонт материнских плат, БП, видеокарт, HDD.
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W83627EHG is tested on other mobo?
If answers is "yes", then remove capacitor and test.
Oscillograph?
Yes. With and without mouse present.
I took W83627EHG from working MOBO where was present +5V on MCLK.
I Tried that. In that case (without capacitor) voltage drops from 0.12V to 0.0V
No:(
May be BIOS
. I don't have other ideas.
After experiments with other MOBO (same model but working) I start to change one by one component and list stoped at MS-66 ACPI controller.
After hese change MCLK stabilised on +5V even when CPU is present. I don`t know how ACPI controller is afecting MCLK but it must be like pain in your knee when your tooth is hurting:) Just atipical metastasis.
Suprises from MSI.
Thank you for the decision of problem
It looks like 6 but it can be G. I would need microscope to determine preoperly.
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