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Precision M20 (and D610?) Charging Problem - Need a Circuit Diagram or Ideas on Diagnosis

Discussion in 'Dell Latitude, Vostro, and Precision' started by john_m20, Nov 26, 2009.

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john_m20 Newbie

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Hi All,

I came across this forum when surfing for an answer on this, any info to a newcomer appreciated.

I've got an M20 which I bought new and has just gone out of warrantee. It runs from battery ok and the battery charges fine on a D610.

Charger goes short when dc jack plugged in and green led goes out.

I've put a scope on the 19.5V and it ramps up to 19.5V and then seems to get crowbarred back down to an oscillating 0.6-5V which appearing as a short circuit at AC-DC with DVM.

Tried another AC-DC from D610 but same result.

I've changed the DC jack already.

Circuit diagram would be good or if someone has experience on what's possibly happened so I can look further. I believe the M20 shares it's motherboard with D610 so any info or experiences with that may help out also.

Thanks,

John

john_m20, Nov 26, 2009

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