How-to: Pencil mod your HD 3870!

Random Murderer · Nov 8, 2009

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

Random Murderer · Nov 13, 2009

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

riggnix · Nov 13, 2009

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 · Nov 13, 2009

riggnix said:
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 · Nov 15, 2009

that should be this one.

Random Murderer · Nov 15, 2009

riggnix said:
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 · Nov 16, 2009

the resistance from pin 13 to gnd is 0 Ω.

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

Random Murderer · Nov 16, 2009

riggnix said:
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.

riggnix · Nov 27, 2009

hi there...
sorry for my late answer, pretty stressful week ;-)

so i tried to measure the resistance of pin 13. i think it is connected to GND, but i'm not sure, i mechanically connected pin 13 and 14 with the test prods and am pretty desperatly trying to seperate them....

i'll give you more infos by the time i've fixed this... but if you have some advice, i would welcome it ;-)

Random Murderer · Nov 30, 2009

riggnix said:
hi there...
sorry for my late answer, pretty stressful week ;-)

so i tried to measure the resistance of pin 13. i think it is connected to GND, but i'm not sure, i mechanically connected pin 13 and 14 with the test prods and am pretty desperatly trying to seperate them....

i'll give you more infos by the time i've fixed this... but if you have some advice, i would welcome it ;-)

no advice, just make sure it works when you're done!

riggnix · Nov 30, 2009

i'm afraid i killed my card.
maybe i'll fix it but after abt 3 hours of trying with the microscope i don't see much of a chance... :banghead:

but if it works again, i'll inform you :toast:

Random Murderer · Nov 30, 2009

riggnix said:
i'm afraid i killed my card.
maybe i'll fix it but after abt 3 hours of trying with the microscope i don't see much of a chance...

but if it works again, i'll inform you

that sucks. i managed to kill the first 3870 i modded as well, so don't feel so bad.

System Name	TOO MUCH RADIATOR! \| The TV Box a.k.a. The Shoebox
Processor	Core i7 4930K @ 4.5GHz \| Core i5 6600K @ 4.5GHz
Motherboard	Asus X79 Rampage IV Extreme \| Asus Z170i Pro Gaming
Cooling	Custom water on CPU and GPU, dual 360mm radiators \| Corsair H80i
Memory	4x 8GB G.Skill TridentX DDR3-1600 \| 2x 4GB G.Skill RipJaws 4 DDR4-3000
Video Card(s)	Sapphire AMD R9 295x2 \| PowerColor AMD HD7970
Storage	Samsung SSD 830 256GB, various others \| 2x 1TB Seagate Barracudas in RAID1
Display(s)	Dell U2713HM 2560x1440 IPS \| Panasonic TC-L32E5 1080p IPS TV
Case	Thermaltake Suppressor F51 (stripped down to hold two radiators) \| Cooler Master Elite 130
Audio Device(s)	RM-DAC -> Xiang Sheng 708b -> Sennheiser HD650 \| HDMI sound device on 7970
Power Supply	LEPA G1600-MA 1600W \| Corsair CX750M 750W
Software	Win 10 64
Benchmark Scores	over 9000 BungholioMarks, "Bitchin' Fast"

System Name	TOO MUCH RADIATOR! \| The TV Box a.k.a. The Shoebox
Processor	Core i7 4930K @ 4.5GHz \| Core i5 6600K @ 4.5GHz
Motherboard	Asus X79 Rampage IV Extreme \| Asus Z170i Pro Gaming
Cooling	Custom water on CPU and GPU, dual 360mm radiators \| Corsair H80i
Memory	4x 8GB G.Skill TridentX DDR3-1600 \| 2x 4GB G.Skill RipJaws 4 DDR4-3000
Video Card(s)	Sapphire AMD R9 295x2 \| PowerColor AMD HD7970
Storage	Samsung SSD 830 256GB, various others \| 2x 1TB Seagate Barracudas in RAID1
Display(s)	Dell U2713HM 2560x1440 IPS \| Panasonic TC-L32E5 1080p IPS TV
Case	Thermaltake Suppressor F51 (stripped down to hold two radiators) \| Cooler Master Elite 130
Audio Device(s)	RM-DAC -> Xiang Sheng 708b -> Sennheiser HD650 \| HDMI sound device on 7970
Power Supply	LEPA G1600-MA 1600W \| Corsair CX750M 750W
Software	Win 10 64
Benchmark Scores	over 9000 BungholioMarks, "Bitchin' Fast"

System Name	RiggniX
Processor	AMD Phenom 9750 @ 3,0 GHz
Motherboard	ASUS M3A32-MVP WiFi-AP
Cooling	Thermalright Ultra-120 TRUE black + 2x Silenx iXtrema Pro IXP-76-18
Memory	4x 1GB Kingston HyperX 1066 5-5-5-15
Video Card(s)	ASUS EAH 3870 TOP 877/1196
Storage	Samsung Spinpoint F1 1000GB 32MB + 2x Maxtor DiamondMax 10 250GB
Display(s)	Samsung Syncmaster 2053BW 20"
Case	Antec Twelve Hundred
Power Supply	Antec TruePower Trio 650W
Software	Microsoft Windows 7 Professional 64bit

System Name	TOO MUCH RADIATOR! \| The TV Box a.k.a. The Shoebox
Processor	Core i7 4930K @ 4.5GHz \| Core i5 6600K @ 4.5GHz
Motherboard	Asus X79 Rampage IV Extreme \| Asus Z170i Pro Gaming
Cooling	Custom water on CPU and GPU, dual 360mm radiators \| Corsair H80i
Memory	4x 8GB G.Skill TridentX DDR3-1600 \| 2x 4GB G.Skill RipJaws 4 DDR4-3000
Video Card(s)	Sapphire AMD R9 295x2 \| PowerColor AMD HD7970
Storage	Samsung SSD 830 256GB, various others \| 2x 1TB Seagate Barracudas in RAID1
Display(s)	Dell U2713HM 2560x1440 IPS \| Panasonic TC-L32E5 1080p IPS TV
Case	Thermaltake Suppressor F51 (stripped down to hold two radiators) \| Cooler Master Elite 130
Audio Device(s)	RM-DAC -> Xiang Sheng 708b -> Sennheiser HD650 \| HDMI sound device on 7970
Power Supply	LEPA G1600-MA 1600W \| Corsair CX750M 750W
Software	Win 10 64
Benchmark Scores	over 9000 BungholioMarks, "Bitchin' Fast"

System Name	RiggniX
Processor	AMD Phenom 9750 @ 3,0 GHz
Motherboard	ASUS M3A32-MVP WiFi-AP
Cooling	Thermalright Ultra-120 TRUE black + 2x Silenx iXtrema Pro IXP-76-18
Memory	4x 1GB Kingston HyperX 1066 5-5-5-15
Video Card(s)	ASUS EAH 3870 TOP 877/1196
Storage	Samsung Spinpoint F1 1000GB 32MB + 2x Maxtor DiamondMax 10 250GB
Display(s)	Samsung Syncmaster 2053BW 20"
Case	Antec Twelve Hundred
Power Supply	Antec TruePower Trio 650W
Software	Microsoft Windows 7 Professional 64bit

How-to: Pencil mod your HD 3870!

Random Murderer

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riggnix

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riggnix

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riggnix

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riggnix

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