Does the control board for the radio controlled car not work? Or a capacitor?

Question

Electronics

Good afternoon.
There is a toy on RU. It does not move when the rated voltage is applied, it barely twitches.
The motors are both perfectly working, both were checked with 4.8v power supply, as it should be, directly. But for some reason, if I give the power supply voltage to the board, through the standard connection of the power source, the wheels barely twitch when you press the remote control, they barely try to turn ...
If, on the board through a regular connection, I give a load higher than the declared 4.8v consumes machine, the wheels start to spin. At 6v, barely, at 9v, too weakly, it spun and stops.
I gave a load of 12v for literally a couple of seconds, smoke came from somewhere, but the wheels spun briskly.
One capacitor stands at 10v and 100uF, I sin on it, I checked it with a multimeter without soldering it (a regular multimeter, it doesn’t check the capacitance, I checked it through the resistance - it slowly but surely gains up to 1, the voltage does not show more than 0.35 V, well, maybe because I didn’t solder the capacitor and it’s on the board ...), although it sounds like it’s working ... Or maybe it doesn’t work))))

What should I do? How to test a capacitor? Connect a known worker in parallel? Materiel did not teach :)))

Answer 1

Open or just a bad connection. Maybe the wiring broke, maybe there is a problem in the track on the board. And you don’t need to apply more voltage to a board designed for 4.8 V, smoke will come from the microcircuit and nothing will work anymore.