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Photo album, sorry for the hassle

Quick question: Ceramic disk capacitor has leaked? Or a dodgy soldering technique? This is a quite old calculator, it's an arbitrary model nowhere to be found. Any information as to what could've happened is appreciated. Thanks beforehand!

edit:

Added more images of what looks like a burnt case and the bottom of the number input panel

  • I wonder if a previous capacitor in that spot exploded and caused the damage you see? – snips-n-snails Aug 20 '17 at 23:17
  • That is definitly more heat than leakage. – tofro Aug 21 '17 at 0:32
  • Looks to me like careless or dodgy soldering; the other pics show the components not flush to the board, which was unusual (except in hand-made 'kits'). – Jeff Zeitlin Aug 21 '17 at 4:21
  • @traal No idea... AFAIK it was factory made and never hand-fixed – Carlos Aug 21 '17 at 9:40
  • @tofro Oh... I see... I guess heat dissipation due to bad voltage – Carlos Aug 21 '17 at 9:41
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That looks like long-term heat damage from a hot running component, especially given how PCB and Case are equally damaged. Not unlikely the transistor which has drossy looking solder joints (look like heat above 180°C remelted them) and looks like it has SPLIT IN HALF from overheating.

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