*************************************************************
Further cleaning work on PSP3000 mainboard
*************************************************************
12th-August-2022
Shanghai, Sunny Super Hot, 40C
Writing on MackBook Pro 2017 ssh & tmux connecting to sdf.org
*************************************************************


## the fix of super capacitor didn't resolve issue
---------------------------------------------------
In last post, I thought the battery power on issue is resolved by
replaceing the super capacitor on the maintboard of my PSP3000,
however, after two days, the same issue happened again -- it won't
power on with battery.
The good side is no date/time lost anymore when pull out the
battery.


## New potential reason and test
---------------------------------
I then collected 3 main potential reason for the remaining issue:
  1. The battery contact pins on mainboard may oxidized.
  2. The mainboard may collected quite some dust
  3. The Flex connectors may not well connected or secured.

So, respectively, I did the below:
  1. brush the contact pin on the mainboard
  2. clean the mainboard surface and parts/IC with 75% Alchol
  3. clean the connectors and confirm it is secured.

After this work, I further tested the PSP3000 for about two weeks,
It never failed again on battery power on. So I guess the reaon lay
on one of the above.
I could not know which of them causing the issue, but I'm happy it
is now working properly.

I hope this helps if you having a similar issue on your PSP.

-Peter