root/LCDモニターの直し・LCD monitor repair/ - 32 file(s) 日本語
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From: Matt on 2012-07-25 19:50:29
I think these are a sort of last-ditch ghetto surge suppressor. The wide traces seem to be connected to the AC power supply. In the event of a lightning strike or similar coming in through the power line, after blowing out the MOVs that protect against smaller surges, the high voltage should arc across these gaps instead of somewhere else in the circuit. The power supply would probably still be destroyed, but it might be less likely to also catch fire.
From: Matt on 2012-07-27 08:11:48
I think these gaps are about 3mm, and the dielectric strength of air is about 3kV per mm, which would work out to 9kV - but that number is assuming no sharp points, which reduce it a lot, and assuming there isn't a lot of dirt on the circuit board or humidity in the air, either of which would also reduce the spark gap voltage. All in all it's probably reasonable to guess that these gaps will arc at an unpredictable voltage somewhere between 1 and 10kV.