HP15C displays gibberish. Is it broken?

[Marcovecchio]

It's the green cylinder just below batteries. However, my 15c is the newer model, with a single pcb, but this part of the electronics shouldn't change too much.

(10-05-2020 08:26 PM)sebi Wrote:  

(10-05-2020 07:46 PM)Marcovecchio Wrote:  I just saw this same pattern on a 15C I was fixing yesterday!
...I accidentally inverted the power supply terminals when trying to power up the 15c!

That is a very nice hint!
Can you tell me where is located the resistor/inductor that was getting hot on the calculator?