rio volt portable mp3 cd player.What type of caps are these?

[GraphicMan]

Hello
this is a rio volt portable mp3 cd player main board
accidentally its 120ac power adapter was used with 220ac
the unit worked for few seconds and then off and never worked again
it normally takes 3volts batts or 4.5dc from the adapter socket

in the picture I believe this is the main power IC (4 channels)
it is the only area in the board that barely gets warm after few minutes
drawing 0.4 watts in total continuously

i did checked all the caps on the board including these caps around the IC
nothing is shorted
but I have never seen these caps before, they have a plastic enclosure

i have a few questions here
1. are these electrolytic caps?
2. with the problem description, how usually these fail? short, low capacitance or high esr?
3. what does 1c means?
4. is it ok to replace with higher cap values or not?
5. do you think the problem is the power IC or the caps around it

thanks

[stj]

Re: rio volt portable mp3 cd player.What type of caps are these?

those are tiny electrolytics inside plastic frames to make them square.
they usually leak on the board!

[GraphicMan]

Re: rio volt portable mp3 cd player.What type of caps are these?

those are tiny electrolytics inside plastic frames to make them square.
they usually leak on the board!

thank you
do u have any other answers for the other questions?