PC CHIP M935 CPU detection problem
Posted on 2009-02-17
Hi, i trying to repair a PC with a motherboard PC CHIP M935(i dont know wich one exactly) only know about the south bridge is 962L and has a front bus of 533Mhz and 2 slots for ddr1 and Sdram 133Mhz.
With an installed P4 2.4Ghz 400Mhz microprocessor.
the problem is, after cleaning with compressed air(none piece was removed or something, only dust cleaned) i tried to run the machine again.. but didnt start at all. Seems to have a CPU problem, i changed the micro with a p4 1.7Ghz and worked great, so, doesnt have a motherboard problem.
I tested the 2.4Ghz on another similar motherboard and worked great too, so, i dont know what is going on.
Manuals of M935 says only support cpus from 1.4 to 2.2Ghz, but the machine was working with the 2.4Ghz before i cleaned the dust.
i tested everything like using the p4 1.7 trying to set manually the 2.4 or 2.2Ghz multipliers.
i reseted the bios like one hundred thousands times, i changed the bios battery to a new one. and nothing work.
something curious is: the motherboard doesnt have the 4 pin connector for 3.3v core , but works with a p4 1.7Ghz and 1.5Ghz(and was working with the 2.4Ghz).
i searched the whole collections of manuals from M935 and didnt appear any special jumper configuration for cpu's.
I dont know what to do, than upgrade the bios but, im afraid because upgrading bios is a dangerous process and the PC was working with the 2.4Ghz proc without an upgraded bios.
maybe somebody can help me.