Home▸ Forums▸ 68kMLA▸ iBook Clamshell SE dim screen — #10
Post #10 by tomlee59
Source Forum68kMLA
CategoryTroubleshooting
Post DateWed, 23 Apr 2008 - 07:38
Original URLhttps://68kmla.org/bb/threads/ibook-clamshell-se-dim-screen.12893/
Post
... a backlight gets on the order of 1000V AC from the inverter ...
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As high as that? Ouch! It warrants pause for thought, then. My only data of that kind come from PB100 series, the blue 160 inverter board (922-0025) and the green 180 board (922-0024) specifically, which are marked on the boards as 350VAC and 400VAC outputs respectively.

However, my scribble-book reminds me that there are more part numbers for other PBs in the 100 series (699-0273 and 922-0375 at least), and I don't doubt that Apple could have used much higher voltages for later PBs.

de
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Yes, one can receive quite a painful bite from these inverters. The nominal operating voltage is roughly proportional to tube length, and the striking voltage is often about 50% higher than that. If a tube fails, the inverter periodically retries to start the tube, so the worst shocks paradoxically can occur when the tube is dark.

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