Sparking anode cap on Sanwa 27

[system11]

I finally started to fix my Time Crisis 3 today which came from a seaside arcade and slowly failed on me after a few years. Very little of the original hardware is still in there due to salt air corrosion, I bought the parts to sort it out a few years ago and was procrastinating because its a horrible job in a dark corner of the garage with little space and the key was missing for one side.

One of the screens has a normal looking dark grey anode cap, that one is working just fine after taking a little time to warm up having sat for a few years. The other one that always used to be better, arcs like crazy at the anode cap. I did unhook both and clean them before trying to power them back up, there was corrosion on the cap pins of the arcing one which I sanded off. The cap style is a white thing that gives barely any seal at all against the tube so I'm not surprised that's the side that corroded.

Is there anything on the actual tube itself that could now be corroded along with the cap, or might I get away with just buying a new anode cap from somewhere and fitting it? I assume you can buy them, or do you have to buy a whole LOPT?

That brownish paint is damaged from the arcing and what looks like screwdriver marks (not me) - what is that stuff and where can I buy some?

Edit: It's a 27Z21C monitor

system112021-07-11 23:33:16

 

[prof5]

i believe you can buy the red paint on the tube, when i have an arching tube i use servisol silicone grease on the cap around the sealing area, usually does the trick

 

[system11]

The actual cap pins were corroded and even after sanding no good I suspect - can the caps . connectors be bought anywhere?

 

[obcd]

If a lopt is replaced, the new one usually comes with the anode wire and anode cap. This doesn't mean the old cap is bad. Anyone doing monitor chassis repairs (and even old crt tv repairs) should have some defective lopt transformers lying around.
The red paint is called the aquadag if I remember well. It used to be available but it was expensive.

 

[gunblade]

the red paint is called anti corona dope

 

[system11]

I found HV paint at a UK company called Brocott - they sell it on ebay in small amounts for less than a tenner

Someone on the AO forum in Italy sent me some anode caps - it really was as easy as cleaning the old HV paint up, applying a new coat (brushed, 24 hrs cure) and popping the new cap on. I couldn't get a smooth finish on the paint so may add some silicon grease soon but the seal felt 'reasonable' with the large cap I used. No more sparks, Time Crisis 3 working on both sides again after several years. That took 1x monitor fix, 1x new IO board, 2x new PSU, 2x new motherboard.... Seaside cab, corrosion just nuked everything.