Securifi Almond 3 Repair (SMD capacitor)
I have a Securifi Almond 3 Wi-Fi unit (802.11 ac)
which are very nice as they can also display the weather but can have a tendency to lock up in hot weather and need a reboot; one associated symptom was that if one rebooted while still hot the reboot would not start for several minutes, while for a cold reboot it began immediately.
This problem was seen by many owners and was unfortunately beyond my own ability to diagnose, but fortunately Securifi took sympathy on me and gave me the solution, a bad surface mount capacitor (0805, X5R, 10μF, 6.3V)
The problem is that the capacitor is just 2 mm long and so quite challenging to replace; found a practice kit for those who might want to do the repair themselves, although I tried without. The 0805 size means .08″ x .05″ (2012 metric: 2mm x 1.2mm) and there are even smaller capacitors to either side, so one must work with care.
I used a low temperature solder alloy (based on bismuth) to help with removal, copper braid with lots of flux (Kester 186) to clean up the pads and leaded solder for the new component to keep installation temperatures down; then a cleanup with isopropyl alcohol to make it look clean as if no work had been done at all. It helps to have a small magnifying glass to check the work.
It has been 2 years now and the unit shows no more issues and once fixed the hot reboot starts right away.
This article was written by Anwar (Andy) Shiekh originally from London, England; he repairs things to help make an income go further and presently teaches Physics in Colorado, U.S.A.
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Note: You can check his previous repair article in the link below: https://jestineyong.com/microwave-repair-failed-interlock-switch/