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pac.attack76

06-07-2023 04:59 PM

1983 Samsung Celebrity K20 chassis has vertical shrinkage

Set starts up normal. After warm up, it starts shrinking. I'm guessing caps in the vertical section. Should I start with those?

damen

06-07-2023 08:18 PM

Resolder the vertical IC, or output transistors first, then replace caps.

pac.attack76

06-07-2023 08:23 PM

Quote:

Originally Posted by damen (Post 3251428)

Resolder the vertical IC, or output transistors first, then replace caps.

Ok, will do. It might be loose because tapping on it corrects it temporarily.

zeno	06-08-2023 08:24 AM

Quote:

Originally Posted by damen (Post 3251428)

Resolder the vertical IC, or output transistors first, then replace caps.

DITTO that will fix 95% of vert problems.

JohnCT

06-08-2023 08:55 AM

Quote:

Originally Posted by pac.attack76 (Post 3251429)

Ok, will do. It might be loose because tapping on it corrects it temporarily.

Yep, most likely bad solder on the transistors/IC due to heat and age. On old solder particularly, it's helpful to add some flux to the crusty joints, flood with fresh solder, then wick all the old solder off. Clean the board, add a bit more flux, resolder transistors/IC, then clean the flux.

John

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