How-to: Pencil mod your HD 3870! - Page 53

riggnix · 11-08-2009, 05:55 PM

i finally got to make some shots and voltage measurements.
here is a .rar with it: http://rapidshare.com/files/304157778/3870TOP.rar

greetings

Random Murderer · 11-08-2009, 10:32 PM

thanks, i'll give them a look and reply tomorrow.

Random Murderer · 11-13-2009, 02:37 AM

i can't find anything about either of the ICs you labeled.
what's the labeling on the circled IC say?

riggnix · 11-13-2009, 07:47 PM

Thanks for your reply.

The Caption of the IC is

AHCT125
709C214
Un607
326

(the last line could be 32B, but i think it's 326. very small text

)

I also measured the resistors around the IC.

I numbered the resistors like this:
http://img263.imageshack.us/img263/4379/unbenanntm.gif

R1 = 10 Ω
R2 = 10 Ω
R3 = 1,3 kΩ
R4 = 10 Ω
R5 = 1,3 kΩ
R6 = 10 Ω

i thought that maybe R3 and R5 are connected in parallel, because i measured the exact same resistance, but they are NOT.

ready to start my multimeter again ;-)

greets

Random Murderer · 11-13-2009, 09:35 PM

Quote:

Originally Posted by riggnix

Thanks for your reply.

The Caption of the IC is

AHCT125
709C214
Un607
326

(the last line could be 32B, but i think it's 326. very small text

)

I also measured the resistors around the IC.

I numbered the resistors like this:
http://img263.imageshack.us/img263/4379/unbenanntm.gif

R1 = 10 Ω
R2 = 10 Ω
R3 = 1,3 kΩ
R4 = 10 Ω
R5 = 1,3 kΩ
R6 = 10 Ω

i thought that maybe R3 and R5 are connected in parallel, because i measured the exact same resistance, but they are NOT.

ready to start my multimeter again ;-)

greets

that IC seems to be a buffer, and therefore is not what we're looking for.
i'll dig a bit deeper for those two ICs fom before, i'm pretty sure BD-9J is the IC we need. do you know how to identify pin 1?

riggnix · 11-15-2009, 07:59 PM

that should be this one.

Random Murderer · 11-15-2009, 10:21 PM

Quote:

Originally Posted by riggnix

that should be this one.

http://img23.imageshack.us/img23/1499/10013312.jpg

ok, now find pin 13. 13 should be on a corner.
once you find pin 13 for me, measure its resistance to ground.

riggnix · 11-16-2009, 03:45 PM

the resistance from pin 13 to gnd is 0 Ω.

i'm afraid we're on the wrong way...

Random Murderer · 11-16-2009, 10:39 PM

Quote:

Originally Posted by riggnix

the resistance from pin 13 to gnd is 0 Ω.

i'm afraid we're on the wrong way...

just looked at the previous pic again. the arrow is pointing to a non-existent pin. the pin to the right of it is pin 1. pin 13 will be the exact same pin on the opposite corner.

System Name:	RiggniX
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Memory:	4x 1GB Kingston HyperX 1066 5-5-5-15
Video Card:	ASUS EAH 3870 TOP 877/1196
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Software:	Microsoft Windows 7 Professional 64bit

11-08-2009, 10:32 PM	#1302
Random Murderer Join Date: Dec 2006 Location: Florida, where it's hot as hell. Posts: 3,296 (3.05/day) Thanks: 393 Thanked 367 Times in 289 Posts System Specs	thanks, i'll give them a look and reply tomorrow. __________________ [img disabled]http://www.wizards.com/magic/images/whatcolor_isred.jpg[/img] You don't need to be much from nothing, you don't need to turn away. Rig 1 & 2: See system specs. Rig 3: ASRock 775Dual-VSTA, Pentium D 820 @ 3.4GHz, 2GB G.Skill 2GBNQ, ATi x1950PRO 256MB, Apevia Chameleon 550W PSU, Modded P1 case. Learn how to mod your HD3870! Click here! "I'm the enchanting wizard of rhythm. I came here to tell you about the rhythms of the universe."

System Name:	Divided by Zer0 \| Fatal Error
Processor:	Core2 Duo E8400 E0 @ 3.8GHz, 450 x 8.5, 9hr Orthos stable \| Core2 Quad Q6600 B3 @ 3GHz, 333 x 9
Motherboard:	DFI LanParty UT X48-T3RS \| Asus P5WDH-Dlx
Cooling:	Xigmatek HDT-S1283, Xigmatek Dragoon N422 \| Stock
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11-13-2009, 02:37 AM	#1303
Random Murderer Join Date: Dec 2006 Location: Florida, where it's hot as hell. Posts: 3,296 (3.05/day) Thanks: 393 Thanked 367 Times in 289 Posts System Specs	i can't find anything about either of the ICs you labeled. what's the labeling on the circled IC say? __________________ [img disabled]http://www.wizards.com/magic/images/whatcolor_isred.jpg[/img] You don't need to be much from nothing, you don't need to turn away. Rig 1 & 2: See system specs. Rig 3: ASRock 775Dual-VSTA, Pentium D 820 @ 3.4GHz, 2GB G.Skill 2GBNQ, ATi x1950PRO 256MB, Apevia Chameleon 550W PSU, Modded P1 case. Learn how to mod your HD3870! Click here! "I'm the enchanting wizard of rhythm. I came here to tell you about the rhythms of the universe."

System Name:	Divided by Zer0 \| Fatal Error
Processor:	Core2 Duo E8400 E0 @ 3.8GHz, 450 x 8.5, 9hr Orthos stable \| Core2 Quad Q6600 B3 @ 3GHz, 333 x 9
Motherboard:	DFI LanParty UT X48-T3RS \| Asus P5WDH-Dlx
Cooling:	Xigmatek HDT-S1283, Xigmatek Dragoon N422 \| Stock
Memory:	2x 2GB Crucial Value D9JNM DDR3-1066 @ 1800MHz, 8-8-8-20 \| 2x 2GiB OCZ Reaper HPC DDR2-1066
Video Card:	Crossfire HIS HD4870 512MB on ref. boards and custom BIOSes \| Zotac 9800GTX+
Harddisk:	Too many, lol.
CRT/LCD Model:	22" Acer P221wBx 16:10 1680x1050 \| Rosewill R912E 19" 5:4 1280x1024
Case:	Lian-Li PC-A05B \| Chenming 601ae-BLU
Sound Card:	RM-DAC -> Xiang Sheng 708b -> Sennheiser HD650
PSU:	Sparkle(Fortron) MAGNA 1000W \| Enermax Liberty 620W
Software:	Win 7 64 \| Vista Ultimate 64

11-08-2009, 05:55 PM	#1301
riggnix Join Date: Nov 2009 Posts: 6 (0.33/day) Thanks: 3 Thanked 2 Times in 2 Posts System Specs	i finally got to make some shots and voltage measurements. here is a .rar with it: http://rapidshare.com/files/304157778/3870TOP.rar greetings

11-13-2009, 07:47 PM	#1304
riggnix Join Date: Nov 2009 Posts: 6 (0.33/day) Thanks: 3 Thanked 2 Times in 2 Posts System Specs	Thanks for your reply. The Caption of the IC is AHCT125 709C214 Un607 326 (the last line could be 32B, but i think it's 326. very small text ) I also measured the resistors around the IC. I numbered the resistors like this: http://img263.imageshack.us/img263/4379/unbenanntm.gif R1 = 10 Ω R2 = 10 Ω R3 = 1,3 kΩ R4 = 10 Ω R5 = 1,3 kΩ R6 = 10 Ω i thought that maybe R3 and R5 are connected in parallel, because i measured the exact same resistance, but they are NOT. ready to start my multimeter again ;-) greets

11-15-2009, 07:59 PM	#1306
riggnix Join Date: Nov 2009 Posts: 6 (0.33/day) Thanks: 3 Thanked 2 Times in 2 Posts System Specs	that should be this one.

11-16-2009, 03:45 PM	#1308
riggnix Join Date: Nov 2009 Posts: 6 (0.33/day) Thanks: 3 Thanked 2 Times in 2 Posts System Specs	the resistance from pin 13 to gnd is 0 Ω. i'm afraid we're on the wrong way...

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