Success !
With the ordinary 7805 regulator I get a clean 5V for the controllerboard, result: Immediately booting up after powering on...
Got slight problems of a mechanical nature because of the non-isolated package but this is nothing against the fact I´ve found the failure...
So one mature failure is solved, things to polish:
- Battery Clip, the old one can be used after cleaning, will follow.
- Original regulator (LDO) will be searched, in this time:
- Correct mounting the 7805 onto the backside.
Next mature failure is waiting, the touchpanel....
It´s getting more and more worse, nearly no response...must have it new, but where to buy..
Need the SM or at least a list of the spareparts part-numbers, in the hope I could buy it.
And then the very yellow frontpanel, but this is cosmetic, not top of the list.
To be continued with a summary todo list..