B&W G3 - Pink Screen After Bootup?

Question

My wife uses a B&W G3, OS 9.2.2. Motherboard Rev. B. Recently, the computer either:
-- boots normally, but after a short interval, perhaps as long as 10 minutes, the monitor goes pink. Solid pink like a sheet of construction paper. Monitor is an LCD screen.
-- tries to boot but never does, going directly to the pink screen.
Zapping the PRAM (multiple tries) did not rectify the problem. Replacing the PRAM battery did not rectify the problem.
Resources found on the web seem to indicate that this is a battery issue, but I could not readily find any description of a similar problem.
Hints appreciated ...
iMac Dual Core   Mac OS X (10.4.9)   9.2.2 and 10.3.9 Macs

Answer 1

There has been a history, in multiple brands of displays, of a problem with resistors in the Red, Green, or Blue input signals getting hotter than anticipated, squirming around, and making intermittent contact.
In the "good old days" these large-ish resistors were axial-lead components that were inserted through plated holes in the board and wave-soldered from below. They never came loose or had problems. More recently, in the move to all surface-mount components, they are now bar-shaped with contacts near the end. Too much heat and their solder joints can fracture.
Conventional wisdom for CRT displays was that to get to the resistors, you had to expose your self to potentially lethal voltages (upwards of 40,000 Volts) that could linger for months after the power was off. The voltages inside a flat panel display can reach few hundred volts, but there is no tube to act as a charge-storage device.