leadpoisoning
Well-known member
- Joined
- Jan 29, 2016
- Messages
- 65
I just posted the other day about this delay i'm working on and while going through the other boards to check for seating problems and/or possible shorts or other issues i found this on the 77.4 card (DAC 3)!
Two big issues. Someone had 'built up' some thick solder pads on the edge connectors to force it to mate better with the backplane connector presumably due to a contact issue. the second issue is some severe corrosion (either from cap juice - more likely?) or else battery electrolyte which mysteriously migrated across the chassis ... the board resides about as far away from the board containing the battery as you can possibly get .. it seems to resemble battery electrolyte corrosion however.
the easier one first. the corrosion. I'm assuming the correct procedure would be to remove all the components in the region - scrub scrub scrub with mild acid (if it's battery alkali) and/or isopropanol etc - then replace any affected components with NEW (in case the existing ones are affected). Correct? And leave no stone unturned?
as for this 'pad' business ... i figure the two main options are to 1. leave it alone and hope the interloper who did this had good reason or 2. remove all traces of solder from the connector and then try to pry up or otherwise adjust the pins on the backplane connector to get things connecting better ... or ... option 3??
Thanks for your time and help
Two big issues. Someone had 'built up' some thick solder pads on the edge connectors to force it to mate better with the backplane connector presumably due to a contact issue. the second issue is some severe corrosion (either from cap juice - more likely?) or else battery electrolyte which mysteriously migrated across the chassis ... the board resides about as far away from the board containing the battery as you can possibly get .. it seems to resemble battery electrolyte corrosion however.
the easier one first. the corrosion. I'm assuming the correct procedure would be to remove all the components in the region - scrub scrub scrub with mild acid (if it's battery alkali) and/or isopropanol etc - then replace any affected components with NEW (in case the existing ones are affected). Correct? And leave no stone unturned?
as for this 'pad' business ... i figure the two main options are to 1. leave it alone and hope the interloper who did this had good reason or 2. remove all traces of solder from the connector and then try to pry up or otherwise adjust the pins on the backplane connector to get things connecting better ... or ... option 3??
Thanks for your time and help