Scenic II keycard repair

[matias]

Hi all,
I have problem with one card from Scenic II. Usually I only change microswitches, resolder pcb with flux. When I tested card in remote reader this works only for one from five push microswitches.
Have You any solutions please for this?
Many thanks

[ghauman]

Hi There,

you need to check soldering again from switches and capacitors around mcu and mcu itselves.
Also check for broken components this happens allot.
Also check if there has goten flux into the switches or heating up to high.

[matias]

OK, I check this again with microscope. Many thanks for help.