Acer 5535 (CP2A) AMD Turon X2 Motherboard Failures – any definite answers?

[Chris56000]

Hi!

There are enormous numbers of these Acer CP2A (AMD Turon X2 CPUs) motherboards on sale, both in complete failed machines, and innumerable eBay listings of the m/b alone, which fail with no display, no proper boot–up and sluggish fan operation.

I have one of these machines myself with the same symptoms, and the number of  "free" and "paid for" quack "cures" online seems to be as numerous as the sands on the seashore!!

They vary from the commercially motivated scam "driver problems" to bios updates, adding piles of coins on the gpu, "professional" bga rework, etc., etc.

However the machine I have did actually come on with the normal Acer logo for a few seconds and then the BIOS text, ending with "no operating system found" – (it's a new h.d.d.)  – however altho' I measure 5V across the red/black fan leadout wires, there's no signs of any fan rotation!

Apart from what seems like an obvious fan failure, are the CPUs/GPUs known to be badly soldered on these series of motherboards, or is everyone barking up the wrong tree because of a voltage regulator or fan supply fault on these m/bs?

I might add, altho' I got the "Press F2 To Enter SETUP" whilst the Acer logo was on the screen, netiher Esc, F1, F2 or Del got me access to the BIOS – the keybord apperars to be properly connected to the main board and all the caps lock, num lock, scroll lock etc work during the short period tbe machine runs.

I have tried reheating the GPU with my employer's IR machine by the way, and I do have another similarly faulty machine coming in the post, bought very cheap in case I buggered up the first one trying to reflow it!

Have any schematics for the Acer CP2A AMD Turon X2 motherboard leaked out? – I don't mind paying a few pounds for a diagram if there's a known regulator fault on these boards!

Chris Williams

PS!

Is 5V correct for the CPU/GPU fan supply on these? I'm fairly sure the fan label is marked "12V" on these – is it possible that these boards have all failed or shut off because a higher speed section of the fan supply circuit that provides 12V for high–speed operation dies?