Abiy AV8 Vmods

[HKY]

I did the same thing with the same result, and 5 minutes ago I connected the other leg of the VR to ground and now the system won't boot up any more, even after I removed the ground. It stopped after "C1", (which means checking DRAM), and then return to "02" and then "C1" again and again. It can't even be turned off by the power on switch. The RAMs are OK because I checked them in another system.

I am afraid that either the motherboard (maybe the uGuru chip) or the memory controller of the CPU is dead.... I'll have to find another 939 board to check it out. Hopefully its the motherboard!

[Sampsa]

I did the same thing with the same result, and 5 minutes ago I connected the other leg of the VR to ground and now the system won't boot up any more, even after I removed the ground. It stopped after "C1", (which means checking DRAM), and then return to "02" and then "C1" again and again. It can't even be turned off by the power on switch. The RAMs are OK because I checked them in another system.

I am afraid that either the motherboard (maybe the uGuru chip) or the memory controller of the CPU is dead.... I'll have to find another 939 board to check it out. Hopefully its the motherboard!

Doh

[HKY]

Doh

Its alright, Sampsa. The second I lay my soldering iron on the board I'm prepared to damage it. Just hope that the CPU is still OK.

Anyway check this out. I think this might work. (Keep trying man!)
http://xtremesystems.org/forums/showthread.php?t=38946

[Sampsa]

Anyway check this out. I think this might work. (Keep trying man!)
http://xtremesystems.org/forums/showthread.php?t=38946

HKY, Hmm you have a VR with 2 or 3 legs? Just 2 legs and and you soldered the other to ground?

If I undestood correctly from the KV8-Pro Vtt thread, I should solder the remaining leg of my 3 leg VR to ground?

[LardArse]

The VTT mod works fine the way I did it:



I never bother connecting to the other solder pad veside the pad cionnected to pin 7 but direct to the mosfet leg. 0 ohms and work up wards

[Sampsa]

Ok Vtt-mod is working. I used the same method what Goldlocke used with KV8-Pro.

1. I removed 0 ohm resistor next to Winbond chip pin 7
2. I replaced it with 10 ohm resistor
3. I soldered 1 kilo ohm VR between 10 ohm resistor (the pad which is nearer Winbond chip) and GND

VR should be set to MAX and lowering the value will raise Vtt

I'm now installing Windows and I'll post the results later. Currently running Vmem 3,02 V and Vtt 1,51 V.

Thanks for your help everyone!

[HKY]

Ok Vtt-mod is working. I used the same method what Goldlocke used with KV8-Pro.

1. I removed 0 ohm resistor next to Winbond chip pin 7
2. I replaced it with 10 ohm resistor
3. I soldered 1 kilo ohm VR between 10 ohm resistor (the pad which is nearer Winbond chip) and GND

VR should be set to MAX and lowering the value will raise Vtt

I'm now installing Windows and I'll post the results later. Currently running Vmem 3,02 V and Vtt 1,51 V.

Thanks for your help everyone!

Good to hear that! I'll do the same after I get another CPU! (Please show a photo for the completed work for easy reference for other users!)