need help with v-mod on gecube X800GT 256mb

[chefnr1]

have this as usual strange pcb layout and i need some help to find out what chip and size on VR's and witch chip and leg to solder on..
http://upl.silentwhisper.net/uplfolders/upload5/PICT1233.jpg
http://upl.silentwhisper.net/uplfolders/upload5/PICT1235.jpg
http://upl.silentwhisper.net/uplfolders/upload5/PICT1236.jpg
http://upl.silentwhisper.net/uplfolders/upload7/PICT1239.jpg
http://upl.silentwhisper.net/uplfolders/upload7/PICT1240.jpg
http://upl.silentwhisper.net/uplfolders/upload7/PICT1244.jpg
very thanksfull for any help with this issue :)

[persivore]

Can you tell me what is written on the chips I've circled please.

[chefnr1]

Can you tell me what is written on the chips I've circled please.
hi on the first chip you circled said RT9214 - PS7F60P
the second said RT9256 - PQV or Y hard to see - 7B106

[chefnr1]

is it hard to fin info about those chip ;)

[persivore]

The RT9214 is probably controling Vdd/Vddq and the RT9256 is probably used for Vgpu. Can you check the resistance between the pin I've marked and ground please.

[chefnr1]

The RT9214 is probably controling Vdd/Vddq and the RT9256 is probably used for Vgpu. Can you check the resistance between the pin I've marked and ground please.
when MM on 2k it shows ,603 and MM on 20k it show 0,60

[persivore]

Try connecting a 10k VR between the pin I marked in the above picture and ground. I'm not 100% sure that it will be for Vdd/Vddq, so find a read point for the voltage first and check if it increases after modding. Vdd/Vddq should be 2.0-2.1v if the card uses GDDR3.

I'll post later for the RT9256/Vgpu mod, when I am on a computer which will allow image viewing/editing at any sensible speed ;)

[chefnr1]

Try connecting a 10k VR between the pin I marked in the above picture and ground. I'm not 100% sure that it will be for Vdd/Vddq, so find a read point for the voltage first and check if it increases after modding. Vdd/Vddq should be 2.0-2.1v if the card uses GDDR3.

I'll post later for the RT9256/Vgpu mod, when I am on a computer which will allow image viewing/editing at any sensible speed ;)
yes i will do that thanks, one leg between that you've marked was accelerating upp in ohm and then stop that could bee the vddq i think??

EDIT: theres ddr2 mem on the card but the volt readings on solder points on backside on the kondensator shows 2,01v on both, so is it right to set an 10K VR on or should it bee an 20K, i have done the mod but not test it yet but i will as soon the silicone is dry that i've duct the VR with on pcb :)

[persivore]

yes i will do that thanks, one leg between that you've marked was accelerating upp in ohm and then stop that could bee the vddq i think??

EDIT: theres ddr2 mem on the card but the volt readings on solder points on backside on the kondensator shows 2,01v on both, so is it right to set an 10K VR on or should it bee an 20K, i have done the mod but not test it yet but i will as soon the silicone is dry that i've duct the VR with on pcb :)
2.01v sounds ok for Vdd/Vddq. The exact value for the variable resistor isn't too important. Any value between 10 to 20k should only give a slight increase in voltage :)

[chefnr1]

2.01v sounds ok for Vdd/Vddq. The exact value for the variable resistor isn't too important. Any value between 10 to 20k should only give a slight increase in voltage :)
ok now i shall try it out :) i'll give you an report later, and please see if you can find out vgpu mod to me :stick:

[persivore]

Can you try to check the voltages at the 2 points I've marked. It looks like the pins are very small from the picture tho, so if they look like they are too small to probe without shorting anything, I'll find alternative points to get readings from.

[chefnr1]

Can you try to check the voltages at the 2 points I've marked. It looks like the pins are very small from the picture tho, so if they look like they are too small to probe without shorting anything, I'll find alternative points to get readings from.
upper point reads 1,33v downer point 1,31v, have tryed the mem mod, gain heavy artifakts, after i mod it it shows 2,13v and i upper it to 2,16v cant go much higher than 2mhz :( on the mem but it's sh..ty infineon mem chip so what can i expect i have to go for the vgpu mod instead :p:

[persivore]

Can you get any wider pics of the front/back of the card? There might be another regulator for the memory.

For the Vgpu mod, can you check the resistance between each of the points I've marked and ground please.

[chefnr1]

Can you get any wider pics of the front/back of the card? There might be another regulator for the memory.

For the Vgpu mod, can you check the resistance between each of the points I've marked and ground please.
both points shows 0,76k
and on the other side there is these two chip just on the other side of the chip i solder VR on and they are marked:APM4210 - XH3R1 and its theese chips http://upl.silentwhisper.net/uplfolders/upload7/PICT1239.jpg

[persivore]

For the Vgpu mod, connect a 20k VR between one of the points that I marked in my above post and ground. Using the resistor might be easier than connecting to the IC leg.

[chefnr1]

For the Vgpu mod, connect a 20k VR between one of the points that I marked in my above post and ground. Using the resistor might be easier than connecting to the IC leg.
yes will do that :) i cant set the VR on the IC le it's too small i could barely measure it on the leg with my MM, but i dont have a digital cam home rught now so i cant take a pic on that side you whant to see about the vdd/vddq i dont know if those pic i sent you in my last post to you is about the memory o not...

[persivore]

The APM4210's look like they are just MOSFETs :(

[chefnr1]

The APM4210's look like they are just MOSFETs :(
hi have had much work right now, but free for the moment, the vgpu mod worked, now it´s just vdd thats have to be wrong it´s artifakt as far as i go over 455mhz,can it be that the mod is vddq and not vdd perhaps :confused:
i will shoot some pics of the backside later for you to se if theres an other regulator for vdd :)

[persivore]

hi have had much work right now, but free for the moment, the vgpu mod worked, now it´s just vdd thats have to be wrong it´s artifakt as far as i go over 455mhz,can it be that the mod is vddq and not vdd perhaps :confused:
i will shoot some pics of the backside later for you to se if theres an other regulator for vdd :)
Its possible that it is the Vddq regulator instead of the Vdd regulator which has been modded. Its usually quite difficult to work out which one is which without seeing how it effects the mem clocks.

[chefnr1]

Its possible that it is the Vddq regulator instead of the Vdd regulator which has been modded. Its usually quite difficult to work out which one is which without seeing how it effects the mem clocks.
yes i saw at the leg one step up that you marked that one accelerate in k when i measured it, i'll just wait for the digicam to take pics of the backside so you can see if there is something you recognize as a regulator..

[chefnr1]

heres two pics on the core side sorry theres a lot of grease on the card i have my komp unit on it.
http://upl.silentwhisper.net/uplfolders/upload5/PICT1247.jpg
http://upl.silentwhisper.net/uplfolders/upload5/PICT1248.jpg

[persivore]

I can't see anything there which might be being used for voltage regulation :(

[chefnr1]

I can't see anything there which might be being used for voltage regulation :(
ok then it's must be one of the other leg on the first regulator that i've solder VR on that give's me rough artifakts, but wich leg can that be and how do i measure it out???