First post, by treeman
I haven't been actively doing any repairs lately, however I got this board hippo octek vl+. I have had it for a long time its always been dead, anyway from time to time ill do a little test with a multimeter here and there just poke around 5-10 minutes every few weeks.
Quick history is board is clean no visual damage, it doesn't power up but does measure voltages on isa slots and power rails from what I recall, cpu even gets warm but no beep bo pciture.
This is the history might not be too relevant to my question.
Today I decided to focus on the 5 capacitors next to the power plug, 3 of them go through the power rails.
This is my question:
I test 3 capacitors that go through the power rails (circled in red) each capacitor shows 0 resistance, no continuity between - and + terminals, however after testing them for continuity they obviously charge up and using multimeter in dcv mode I can see each capacitor holding 2.4V and drain down as I measure it, they discharging normally.
When I do the same procedure on the 2 outside caps (circled in blue) they show a resistance of 100, so not full continuity but a measure resistance. But in dcv mode they hold 0 charge.
all 5 caps are the same, however the blue circle caps do not go through the power rails, the red do.
Is this expected behaviour? I was expecting if it is same type of capacitor they would all behave same and hold charge?
all 5 capacitors show continuity from - pin to ground (screw holder on board) so they should all discharge at same rate?
I do realise they are in circuit and should all behave different depending what they are connected to, but not that much difference not to show any charge.