29-06-2022, 04:18 PM
(This post was last modified: 29-06-2022, 04:22 PM by Mike Watterson.)
I just repaired my S-VHS this week. 68uF 350V on the output of SMPSU input bridge rectifier was open circuit*. I used 2 x 400 uF @ 200V in series out of a 25 year old PC PSU (tested OK), with 100K Ohms across each, so in theory 200 uF at 400V. The bridge looks beefy, so the extra capacitance shouldn't be an issue. The valve rectifiers are more of a problem if you have excess capacitance.
I agree, a decent separate 220uF and 47uF is likely fine to replace a 250uF and 60uF.
(* Oddly it would power on if no AV cables plugged in. Also it drove the touch panel "buttons" on the TV mad if cables unplugged and VHS powered on. On bench with loop on scope you could see nice full wave modulated RF!)
I agree, a decent separate 220uF and 47uF is likely fine to replace a 250uF and 60uF.
(* Oddly it would power on if no AV cables plugged in. Also it drove the touch panel "buttons" on the TV mad if cables unplugged and VHS powered on. On bench with loop on scope you could see nice full wave modulated RF!)
