SMT Repair

F

FreeSkier

Guest
Hi all,

I have a dead Abit BP6 board that I'd like to revive. While inserting a
PCI card, I took out RN76 - an 8 pin SMT device right next to where the
bracket goes past the PCB.

I assume the RN is for resistor network, but I can't get any
identification #s off it (I chipped the top surface). Any ideas on how
to id this device? Also, I've never done any SMT work. What's involved?

Thanks,
Tim
 
Unless you have the skill and tools to repair a multi-level pc board it may
be best to consider obtaining a new mother board.
"FreeSkier" <nomail@nycap.rr.com> wrote in message
news:X2Qab.128364$7G2.15682@twister.nyroc.rr.com...
Hi all,

I have a dead Abit BP6 board that I'd like to revive. While inserting a
PCI card, I took out RN76 - an 8 pin SMT device right next to where the
bracket goes past the PCB.

I assume the RN is for resistor network, but I can't get any
identification #s off it (I chipped the top surface). Any ideas on how
to id this device? Also, I've never done any SMT work. What's involved?

Thanks,
Tim
Click to expand...
 
FreeSkier wrote:

Hi all,

I have a dead Abit BP6 board that I'd like to revive. While inserting a
PCI card, I took out RN76 - an 8 pin SMT device right next to where the
bracket goes past the PCB.

I assume the RN is for resistor network, but I can't get any
identification #s off it (I chipped the top surface). Any ideas on how
to id this device?
Click to expand...
Can't help there, it would help if someone who has the same board could
post the numbers from an undamaged RN76.

Also, I've never done any SMT work. What's involved?
Click to expand...
An 8 pin resistor network is easy to change if you use chipquik and an
automotive feeler gauge. Coat the pins in flux, add the chipquik, and
keep the whole mess molten (only takes about 350F) while you scoop the
part off with the feeler gauge. Clean up the site with solderwick then
pure alcohol & cotton buds, and flux the pads. Align the new part, and
press firmly on it while you tack two opposite corner pins. Solder the
remaining pins, resolder the tacked pins, clean off flux with alcohol,
and you're done.

http://www.chipquik.com/

I'm not in any way affiliated - but this product helps make do it
yourself SMT repair possible. I've used it to change the 56pin SSOP
clock generators on PC motherboards :)

Thanks,
Tim
Click to expand...
 
FreeSkier <nomail@nycap.rr.com> wrote in
news:X2Qab.128364$7G2.15682@twister.nyroc.rr.com:

Hi all,

I have a dead Abit BP6 board that I'd like to revive. While inserting a
PCI card, I took out RN76 - an 8 pin SMT device right next to where the
bracket goes past the PCB.

I assume the RN is for resistor network, but I can't get any
identification #s off it (I chipped the top surface). Any ideas on how
to id this device? Also, I've never done any SMT work. What's involved?

Thanks,
Tim
Click to expand...
Since it came from a PC motherboard,it's probably a pullup network for a
databus.Meaning it's several resistors,each connected to one line of the
bus,and the other ends all going to +5v.Remove it,measure to find what
value it is,then use a catalog to select a similar part.

--
Jim Yanik,NRA member
jyanik@kua.net
 
Thanks to all- will try this. The board is worth trying to fix, plus
I'll learn (or break!) something along the way.

Jim Yanik wrote:
FreeSkier <nomail@nycap.rr.com> wrote in
news:X2Qab.128364$7G2.15682@twister.nyroc.rr.com:


Hi all,

I have a dead Abit BP6 board that I'd like to revive. While inserting a
PCI card, I took out RN76 - an 8 pin SMT device right next to where the
bracket goes past the PCB.

I assume the RN is for resistor network, but I can't get any
identification #s off it (I chipped the top surface). Any ideas on how
to id this device? Also, I've never done any SMT work. What's involved?

Thanks,
Tim



Since it came from a PC motherboard,it's probably a pullup network for a
databus.Meaning it's several resistors,each connected to one line of the
bus,and the other ends all going to +5v.Remove it,measure to find what
value it is,then use a catalog to select a similar part.
Click to expand...
 
I have a dead board here which has a lot of those devices on it of different
values. If you
figure out what you need perhaps I could send you a replacement.

To email me change the "at" in my address to @.

Ken

"FreeSkier" <nomail@nycap.rr.com> wrote in message
news:X2Qab.128364$7G2.15682@twister.nyroc.rr.com...
Hi all,

I have a dead Abit BP6 board that I'd like to revive. While inserting a
PCI card, I took out RN76 - an 8 pin SMT device right next to where the
bracket goes past the PCB.

I assume the RN is for resistor network, but I can't get any
identification #s off it (I chipped the top surface). Any ideas on how
to id this device? Also, I've never done any SMT work. What's involved?

Thanks,
Tim
Click to expand...
 
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