bridge joints or NOT? Need help

[bashy]

Last night i was putting together wires as im still waiting for my chip. As i was soldering P,O,N,M bios wires i got a bridge which i think was on pin 8 and got spread to pin 11, after about an hour of cleaning up the bridges i used a 100x mag to examine the joints and they look to be clean but i still get a reading with the Vmeter as if there is still a connection, not sure if they are bridged or as part of the internal chip they are crossed !

The pins in ? are Going from left upper portions of the bios, where the P,O,N,M are ie P wire is 2 and M is 8.

I get Positive readings for a connection on pins

8-9
9-10
11-12

Also
2-3

[ikari_01]

As long as the resistance is not very large (some kOhms at least), the pins are bridged.
If you tested for conductivity and your multimeter beeps, they are definitely bridged. Hard to tell what you can do about it then, I'd like to know as well.

[freakyfred]

Hey peeps to best undo a solder bridge is using a lil solder wick put a lil flux on it apply it to your supspect bridge and hold your iron to it for no longer than a sec and watch the copper wick closely as to how much solder you retreive.

It dosent take but a mega sec to undo yor bridge and in most cases if ya aint fast enuff you will unsolder your component just put a lil flux on that and reflow some solder and inspect it thuroughly.


Hope dis helps

[drongo22]

I usually set my digital multimeter on 20Kohms, u will notice a slight resistance between two pins on the bios due to the ICs internal circuitry-this is normal. IF however you get a zero reading when testing two pins then you definately have a short...EXCEPT for one of the pins near the middle of the row that contains m,n,o,p this pin gives zero resistance when checked against a couple of pins i tested, this again is normal. Sorry cannot remember pin number that seems 'common' only if I remember near/next to it is a small marking on the PCB similar to a track.

PR

[bashy]

WEll i got the solder braids and i got some of the bridges out but still remains two. The strange thing is after testing with meter i get a reading from pin 10 to 12 that seems to be bridged but NOT from 10 to 11, also 11 to 12 are bridged. No Clue how this can be, that 10 is bridged to 12 but not to 11 which is the next one over. Hope the pic can help out. If anyone has a open unit can they do a quick test on these pins. THanks .

[freakyfred]

Hey bashy just wandering did ya have solder bridged in that location, if not i would say its the ic's circutry thats giving you a reading or the pcb circutry giving you a reading.

I by no means know how them ics werk or ther inner circutry.


If ya didnt have any solder in that location chances are its not a bridge. Just inspect your werk very carefully. Read up on drongo22 post tyr that ohsm test might shed a lil light.



Hope dis helps

[bashy]

yes i got some solder on those pins!

i just dont understand how there can be a bridge from 10 to 12 if 10 is not bridged to 11!!!!

[charlie_ps2]

That's because you have the pin numbers wrong. The pins in question are 35, 36, 37 & 38.

35 & 37 are GND so they would show zero ohms (these are your 10 to 12). Pin 38 is not connected to anything and is irrelevant. Pin 36 is a business pin and should NOT be zero ohms bridged with either adjacent pin.

Ikari_01 is wrong; a bridge occurs if the resistance is Zero.

[bashy]

1st of all charlie, your nothing short of a god, saved me alot of time. Now i know that those 2 pins are ground you saved me alot of testing time.

2nd, i know that there are not really pins 10,11... hehe, pin 1 of coz is where the circle dot is at but i just stated it like that to make it simple hehe.

Anyways looks like all bridges are gone, only one that was there was from 36 to 37. A little braid got rid of it. Thanks again, now just waiting for my m2 to come in.

[Type_e]

Originally posted by drongo22
I usually set my digital multimeter on 20Kohms, u will notice a slight resistance between two pins on the bios due to the ICs internal circuitry-this is normal. IF however you get a zero reading when testing two pins then you definately have a short...EXCEPT for one of the pins near the middle of the row that contains m,n,o,p this pin gives zero resistance when checked against a couple of pins i tested, this again is normal. Sorry cannot remember pin number that seems 'common' only if I remember near/next to it is a small marking on the PCB similar to a track.

PR

I got a zero reading for M and the pin between M & N, I am suspecting that it is bridged but I am hoping that this is the point you said it'll give zero resistance.