Little help :D

[Davor]

Some 20 years ago when I was starting my career as a fresh engineer, in USA we still used a freon spray to clean just about everything. It worked perfectly. Everything was clean as a whistle in a jiffy. No drying or other boring procedures afterwards. It made incredible bubbles in your hand too. it was fun. Too bad it is unlawful now everywhere but in China. Guess that's the reason why all that "ecology" and "green" and "planet friendly" solar panels that require large quantities of freon gas for cleaning are produced in China. It is much cheaper to just evaporate it than to recycle it in a true environment friendly facility.

[eessoo]

okay
i will buy one

[jap]

what is dry spray?
Like:Fast evaporating, non-chlorinated precision cleaner spray for cleaning of electrical/electronic components.
Examples of applications: for cleaning distribution boards, switches, relays, potentiometers, plug-in connections, & PCB's..
j.

[eessoo]

-4.7v and 5.1v
i used the alcohol 12h ago it's dry now
should i use the distill water to clean the alcohol residues ?
what is dry spray?

[jap]

Hi eessoo
To clean the upper surface which Is located components use the dry spray and wait for hours to the best fully dry and then try.
Method:- Put the PCB in vertical position is then spray it in places that need cleaning, With left dry in the same vertical position.
best time
j.
.

[porkluvr]

Stop.
Unless you have compressed air to blow the old alcohol or water away you should let your PCB dry for several hours or even overnight before powering it up.

After that, make sure you still have -5V.

[eessoo]

GUys it works but with very low sensitivity
and it keeps beeebing but when i move the metal near it stops beebing ( is that normal?)

[porkluvr]

i used alcohol and tooth brush to cleaned it
should i remove the ICs and clean under them?

Nooo, not if they're soldered. But I would pop the ICs out of sockets and clean there.

I read somewhere else where you said your flux is "non-conductive". For that, you do not need to be as thorough in removing as you would if you were using the older style rosin flux. But you should still try to clean it away.

[jap]

Test

Test all.
-with success
j.

[maikl]

i did another one but with the same problem
and U6 get a little hot
how can i test it to find the problem?

Pay attention to the U6 = ICL7660, see http://www.geotech1.com/forums/showp...9&postcount=69

[eessoo]

All clean now

[eessoo]

i used alcohol and tooth brush to cleaned it
should i remove the ICs and clean under them?

[eessoo]

the blue resistance read 238k
and u are right about the 51k resistance i thought it was 15k
the flux i used is (http://www.alibaba.com/product-free/...showimage.html)
it says on the cover ( for soldering and tinning ) and ( free from acid ) in french
so i should soak it in alcohol and use a tooth brush?
and please use the last image i uploaded it's a different PCB

[porkluvr]

It would not hurt to clean the flux off your board. Use isopropyl alcohol, methyl alcohol, Everclear etc.

What is that flux made from? If it is rosin flux, it should be soaked in alcohol and scrubbed over and over if it has sat on your board for more than a few hours. Make the board spotless. Some kinds of flux must be removed with distilled water. Use whatever it takes.

Even if it's 'no-clean' flux it should be removed, but then don't worry about it being "spotless".

You need to replace those 15k resistors with 51k.

[eessoo]

i did another one but with the same problem
and U6 get a little hot
how can i test it to find the problem?