must meter the cap. off-board
must meter only after fully discharge, ie. not only has been shorted but also must ensure its capacitor dielectric relaxation has been really gone off
must has tool to meter ESR determine cap. R which must be, after its V division with series R.thev. is so low negligible good is less than 0.7-1 Ohm
Hi, I desoldered the green caps. I only have a BM869s to test them. The resistance is between 1.2k and 1.38k for the three of them.
The blue components (they are not caps, aren't they?) report fully open circuit and infinite resistance.
I don't have an ESR meter at hand.
If you are talking about the green and blue components near the input in this picture:
https://lygte-info.dk/pic/UNI-T/UT139S/DSC_0002a.jpgGreen= PTC, they are resistors that increase in resistance when they get hot (positive temperature coefficient) and around 1.2KΩ sounds in the ballpark for them.
Blue = Sparkgaps, they only conduct when the voltage is over their breakdown, like 700v or 1000v or whatever they are rated, otherwise they should read open.
P.S: Measuring actual capacitors like the SMD capacitors to the left in the picture is only useful in capacitance mode of your meter, that is located behind the diode mode by pressing the select key of the BM869s.
I would measure the components I have marked in the attached photo, from collector to emitter and then emitter to collector and reporting the result for each of them. Then from base to emitter and emitter to base in diode test mode with your meter, or better if you have one of the cheap "component testers" aka "transistors testers" test them on that.