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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
What is the best method for cleaning up leaked electrolyte? This PCB has some
corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. |
#2
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
DaveC wrote in message
... What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. litmus test first to see of acidic or alkaline and go for the opposite as cleaner ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://diverse.4mg.com/index.htm |
#3
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
"DaveC" wrote in message ... What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. If you can beg or borrow an ultrasonic cleaner, ordinary water with a dash of washing up liquid will do fine, Any crystals or ceramic resonaters should be removed before ultrasonic cleaning. If the construction of any components mean they trap water, a second dip without detergent will be needed, and you may have to bake the board to dry everything - the pre-heat phase on a SMD oven should do it. |
#4
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
DaveC wrote:
What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. I scrub with white vinegar and a toothbrush, then rinse with alcohol. If the corrosion is more severe, mechanical methods may be needed, Scotchbrite type cleaning pads work well but you have to be careful not to damage fine traces. In some cases it's best to neutralize and then clean off as much residue as possible and then leave the remaining corrosion alone. |
#5
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
On Sat, 10 Apr 2010 11:15:57 -0700, DaveC wrote:
What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. Dishwasher. John |
#6
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
On 11/04/2010 5:43 AM, John Larkin wrote:
On Sat, 10 Apr 2010 11:15:57 -0700, wrote: What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. Dishwasher. John You must be single. |
#7
Posted to sci.electronics.design,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
"N_Cook" wrote in -
september.org: DaveC wrote in message ... What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. litmus test first to see of acidic or alkaline and go for the opposite as cleaner ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://diverse.4mg.com/index.htm use vinegar if an alkaline electrolytic,or sodium bicarbonate(baking soda)solution if acidic. then rinse well,prferably with distilled water,then some 90% isopropyl alcohol to dry. use a cotton swab soaked in one of the solutions to test it,then try the other on a new swab. vias would probably wick up the solution by capillary action. -- Jim Yanik jyanik at localnet dot com |
#8
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
On Sat, 10 Apr 2010 11:15:57 -0700, DaveC wrote:
What is the best method for cleaning up leaked electrolyte? The electrolyte is mostly a weak organic acid. Neutralizing it with any manner of mild base will prevent further corrosion. I use household cleaner, such as 409. You can tell that it's working if the liquid foams slightly on contact. This PCB has some corrosion on IC leads and vias. 409 will also break up the copper sulfate. However, you'll have to wash off the residue. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. The trick is not neutralizing the electrolyte. It's cleaning up the mess afterwards. I smear the residue and "suds" around with a paint brush, wash with water and/or alcohol, and then use compressed air to blow as much of the liquid away (so it will dry quicker). Canned air doesn't work well. An air compressor and nozzle work just fine. Would something like DeOxit work in such an application? No. It will leave an oily residue that will eventually turn into a big mess when the dust lands on the oil. It's also kinda expensive for washing boards. This is on a Tek scope acquisition board. Obviously, there's no need to supply a Tek model number. Many such pieces of test equipment are very sensitive to leakage caused by board contamination. For such boards, you may need to give it an alcohol bath, possibly several times. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#9
Posted to sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
David Eather wrote in
: On 11/04/2010 5:43 AM, John Larkin wrote: On Sat, 10 Apr 2010 11:15:57 -0700, wrote: What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. Dishwasher. John You must be single. I've used my dishwasher and Calgonite to clean 2236 DMM boards,then a drying session in our TEK field office's drying oven at around 140DegF for 3 days. -- Jim Yanik jyanik at localnet dot com |
#10
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
David Eather wrote:
On 11/04/2010 5:43 AM, John Larkin wrote: On Sat, 10 Apr 2010 11:15:57 -0700, wrote: What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. Dishwasher. John You must be single. You can always do it while the wife is out, it's not gonna damage anything. When I was a teenager I occasionally washed engine parts in the dishwasher, not something I'd recommend, but my mom never found out. |
#11
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
On Sat, 10 Apr 2010 19:19:20 -0700, James Sweet
wrote: David Eather wrote: On 11/04/2010 5:43 AM, John Larkin wrote: On Sat, 10 Apr 2010 11:15:57 -0700, wrote: What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. Dishwasher. John You must be single. You can always do it while the wife is out, it's not gonna damage anything. When I was a teenager I occasionally washed engine parts in the dishwasher, not something I'd recommend, but my mom never found out. Just be sure to do a 60 C bake for about a half hour afterward. |
#12
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
["Followup-To:" header set to sci.electronics.design.]
John Larkin wrote: On Sat, 10 Apr 2010 11:15:57 -0700, DaveC wrote: What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. Dishwasher. Excellent advice. A household dishwasher (with the normal powder detergent) is an extremely cheap and powerful cleaning device for almost anything. It took me a while to convince my ex-lab to use one for cleaning larger UHV parts rather than an appropriately-sized ultrasonic tank which would have cost the equivalent of 100 dishwashers. There are things that a dishwasher isn't good enough for, but they are few. robert |
#13
Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
"James Sweet" wrote in message ... David Eather wrote: On 11/04/2010 5:43 AM, John Larkin wrote: On Sat, 10 Apr 2010 11:15:57 -0700, wrote: What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks. Dishwasher. John You must be single. You can always do it while the wife is out, it's not gonna damage anything. When I was a teenager I occasionally washed engine parts in the dishwasher, not something I'd recommend, but my mom never found out. It was a different story the one time I put a pan of trichloroethane on the gas ring! |
#14
Posted to sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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Cleaning leaked electrolytic & corrosion on PCB
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