This is my other Sony VPH-1000QM CRT Projector.

VPH-1000QM Specifications

15khz video bandwidth

Composite or S-Video signal input

5.5 inch diagonal, 700 Lumens, Sony SD-187 CRTs

Projector weight 25 Kg

I was given this projector by a mate who removed it from a site he was working on, I was told it was going to be dumped in a skip if no one wanted it, me being me not wanting to see it dumped went and collected it.

When I initially powered the projector up it seemed to be in good working order until I looked though the lenses, what I saw was the green and blue tubes both had a bad buildup of this white cloudy stuff with funny lumps in inside the coolant chamber used to keep the tube face and therefore the phosphor in the tube cool.

What causes this buildup is a reaction over time between the Glycol coolant and the actual metal (Aluminum) CRT frame / mount that also forms part of the chamber, Glycol starts to eat any exposed metal away and in doing so deposits this white cloudy and lumpy substance onto the glass tube face and chamber plate, the fact that Glycol absorbs moisture in the air though the chambers sealant (as it is hydroscopic) also adds to the reaction as the water contains oxygen which causes the metal to oxidize.

The process to remove this buildup dubbed by those in the industry as "Tube Fungus" can be a simple, from Glycol removal and flushing with some house hold cleaner such as Cilit Bang in the easiest form to the much more devastating, take tubes out of projector, drain Glycol, cut off front Glass chamber plate and physically remove the heavy buildup of "Tube Fungus" then clean the old sealant off, re-seal glass back on and refill with Glycol.

Unfortunately mine was the more severe form of buildup resulting in both tubes being dismembered, cleaned and reassembled taking a few days allowing new sealant to cure before refilling with Glycol.

Pictures of the fungus removal process can be found HERE