View Full Version : Odd 9600 pcb layout vmods.
The card is a 9600 pro I just got back from rma and it doesn't look anything like the one I had, layout wise at least. I wanna try and find some volt mods for it. The back of the card is almost blank except for one mosfet which reads "APM3055E" There are also small 3 legged ic things that read "PH0o BCP68"
On the front of the card there are more things that look like regs.
3BF1T7K-ACT86 14 legged ic which has what I think to be a texas instrument logo on it.
JM3SEV - LM324M 14 legged ic with a small circle spike looking logo on it.
Datasheet: http://www.national.com/ds/LM/LM124.pdf
R350C-4HBL-F7413 8 legged IC
RT9173A - an odd 5 legged IC that looks like a mosfet.
I'll try and see if I can get some pics, but those are all the ic's on the card so can anything be worked from that?
Hell-Fire
08-11-2004, 10:15 PM
Pic of board??
The RT9173 is typically a Vtt chip.
My pop has the camera so I can't take any at least not tonight. Those are all the ICs on the board. There is nothing else really.
Hell-Fire
08-11-2004, 11:15 PM
The LM chip is prob controlling either Vgpu or Vddr.
Do a connectivity between the output pins of it and the FETs/Caps that are reading Vddr and Vgpu.
Well I looked over the datasheet and which pin do you think is likely to be it? +V?
Hell-Fire
08-12-2004, 06:45 AM
Find the FETs and/or CAPs that will read Vddr and Vgpu. Then do the connectivity test between those points and pins #1, #7, #8, and #14. Those are the outputs.
Once we figure out which output is supplying the Vddr and Vgpu, we can try modding the inverting inpout pin each output pin.
Example: If Output Pin #1 is supplying Vddr, then we try modding to pin #2.
I found connectivity between pins 13 and a cap on the back of the card that reads 2.66V. Sounds like the vdd voltage right there.
Hell-Fire
08-12-2004, 10:28 AM
Pin #13 is the inverting input for output pin #14.
Do a resistance between #13 and GND and post what you find.
We need to make sure its Vddr and not Vddq.
I dont recall what the baseline Vddr is for the 9600 cards.
CaTalyst.X
08-12-2004, 10:52 AM
That sounds a bit low for Vddr, thats probably vddq. BTW HF, this is a 9600 not a ti4200. I feel for ya tho :P Its easy to get confused =/
-CaT
Hell-Fire
08-12-2004, 10:54 AM
LOL...see what happens when you get 2 hours of sleep and toke on to much solder/flux fumes.
:hehe:
ohms resistance or voltage? voltage was 2.6
and resistance is 263ohms
skate2snow
08-12-2004, 04:34 PM
I'm almost sure that the 2.66 is VDDR. I had a 9600PRO, and the VDDR was 2.62V w/o mod, even if stock is supposed to be 2.7V....
On all the 9600PROs I had, the RT9202 is the VGPU controller...
Hell-Fire
08-12-2004, 05:35 PM
Well, nothing else to do but give her a try then.
If the resistance between #13 and GND is 263ohms, then a 1K VR is gonna lower resistance by a solid 60 ohms, which may be to much to start with since we are shooting in the dark right now.
I would start with a 5k-10k VR just to be safe. Keep a good eye on the voltage as you adjust the VR. If you dont get an increase after 2-5 turns, then I would stop and we need to take another look at it.
If possible, please check the voltage on #14 and post that. Just odd the #13 is tied directly to that cap.
Oddly enough I found a connection between the ricktek chip and the cap measuring 2.65 volts.
http://www.richtek.com.tw/Product/Docs/DS9173A-09.pdf
It's pin 1 "vin", but no idea what that means. Anyone make sense of that one? Resistance between pin 1 and a ground is 85.2.
Got some pics now.
http://brainwashstudios.com/steve/lastscan2.jpg
http://brainwashstudios.com/steve/lastscan.jpg
Hell-Fire
08-13-2004, 05:45 PM
What are you getting on pin #5 of RT9173?
0.594OHMS. also 5 is connected to the cap that reads 2.66v
Hell-Fire
08-14-2004, 12:21 AM
Ok, pin #5 is the actual output for the RT ICs.
Give me a resistance reading for pin #4 and lets see if we can change the Vddr by modding this RT9173 IC.
Hell-Fire
08-14-2004, 11:47 PM
Are you sure that isnt 0.524 K ohms??