Hi Max,
I guess you mean A10, the main board. At least on my schematic.
Anyway, do you have access to an ESR meter? That would be a little easier than a shotgun approach.
But here are the caps to look at:
C937 1800 uF/ 75 V
C961 33 uF/ 160 V
C965 270 uF/ 40 V
C971, 972, 975, 976, 985 ?? 840 uF/ 12 V
Be sure to use caps from a reliable source. Avoid the china caps or ebay.
Have you checked the tightness for all the PC board mounting hardware?
Any way, good luck. Being in 50Hz land the RIFA caps should be the first step. Be sure to use safety caps.
Regards,
Tom
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On 6/28/2020 6:22 PM, Maxsimmonds1337@... wrote:
Hey Tom,
Thanks for replying. I don't have any LED lights but I do have a florescence one (but that's spitting out crap at 50Hz so I assume it's fine). Either way, I took the scope to another room in the house and it's still the same. In fact, I'm facing a very similar problem to what's outlined here - /g/TekScopes/topic/7638108
I checked the grounding on the CRT tube, the resistance from the earth pin to the top of the tube, and it was in the order of ohms, so I cleaned up the ground clip contact, it reduced the resistance to sub-ohm, but this did not help.
So, I guess I had better start replacing some caps, the rifa ones looked cracked, so I'll start with these. The PSU filtering caps, are they all on A18?
Thanks again!
Max
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