What are u doing that a Mainboard is looking nice and clean after working on it ?

[Dozer]

Hi,

I still have problems to let the boards loking nice after cleaning.

I clean it in ultrasonic and then in alcohol.

after drying on the air most times when hold the board near window it looks like water damage board. there where was alcohol left is after drying a not nice trace like a sign of water damage.

I use a lot of time to brush and clean and drying but i am not happy with the result.

are there any hints? how do you do that ?

 

[captainmac]

i have better results with a better concentration alcohol; also don't let your alcohol come into contact with air too much: it evaporates quickly, leaving your 99,9% solution turning into a 70% in no time. The water is the stuff that leaves the white residue.
After ultrasonic, i clean with fresh isopropyl and a soft brush. sometimes i use compressed air to blow it dry, gives me nice clean results.

 

[briancomputerdoctor]

I have had problems with white residue left on the motherboard after using the ultrasonic cleaner. Usually the white residue appears in very small areas between contacts on chips.

What have you found is the best way to avoid this?

 

[2informaticos]

I hope you've used distilled, not tap water.
Also do not add alcohol.

 

[briancomputerdoctor]

I am using de-ionised water.

What do you mean by, do not add alcohol?

 

[2informaticos]

Some people use alcohol for UC, not recommended.

 

[briancomputerdoctor]

Some people use alcohol for UC, not recommended.

Agreed

 

[briancomputerdoctor]

After using the UC I give the motherboard an alcohol bath. I thought this might be causing the problem but have since dried some boards without the alcohol and have had same results with the white residue.