Once again, I call for the help of this community to enlighten me on some aspect of a repair I am trying to start today.
The forum has been under some changes lately, so I hope it is still fine for me to post this here (Olivier, tell me if you are ok with this sort of rambling being on the Mi forum). If not, please point me where I could post this (The Mi forum and community is the only one I am familiar with.
So a friend of mine came with a broken Yamaha RS7000 that needs some reapair (and quite quick as it would be for Ceephax acid crew’s use during a gig).
-On power on, the unit does not react, the screen backlight is on and some lines appears but fades away. No leds lit, no reaction from buttons.
Things done so far:
-I have checked the power supply board, everything is fine, the correct voltages are supplied to the right connectors.
Things I have noticed and that I think could be the problem:
-On the main board, almost all the caps labeled L2p 47 16V seems to have some sort of leakage under them.(check pictures below)
-Why is it the case that only these value have this problem?
-These caps are all linked to big and critical IC’s, so I believe that could explain the no answer from the machine as they are note operating well?
Things I would need advice on:
I am confident in trying to replace the bad caps myself although this would be my first time with SMD (these particular caps seems nonetheless not that small, as the pads they are connected to).
-Some 47uF caps are labeled L2p, but others 47uF are labeled differently (I9) and the latter do not seem damaged, so what does this L2p means? Might explain why all the L2p caps are bad.
-Do you have any advice in replacing those? Should they be only 16V too? Can I replace these with thru hole caps?
And las but not least, is it worth it? DO you thin these bad caps could have done any unrepairable damages to the crucial ICs?
Thanks a lot in advance for your time!
Pictures of the caps: