BL> Have you ever worked on a TV PC board as old as 25 years? Is
BL> that what happens in the end? I've never heard of this sort of
BL> thing... it's almost as if the wire has corroded *inside* the
BL> solder. 

JT> Spare a thought on the monitors we used to work on. 14" and for
JT> some reason, they still had to use a +35KV EHT.

 That's dangerous! Once you get above 30KV, X-rays are a real option.
Those el-chepo X-ray machines in clinics run at 40KV. 

JT> Dry joints all over the place on those things, forget about
JT> trying to find them, we just dismantled the boards, and hit ALL
JT> the joints with the solder sucker. Four hours later, fixed!

 It's not the whole board... just the 16KHz hi-current paths. I gave
up and did that, resoldered the lot and it failed AGAIN last night.

 It's not that I haven't found the fault, I've found FOUR separate 
faults! And this is a new one... bloody hell.

... later

 Well, I found that dry joint, and it's been working for a week now.

Regards,
Bob

--- BQWK Alpha 0.5