I'm working on--really just learning how to repair--an Acer Chromebook that no longer works. As far as what is wrong with it, when you plug in the charger, the light on said charger goes out. The first thing I did, then, was check the power rails for a short, which seems to be the main culprit in many instances, but not in this one. No shorts, but I did find something that confuses me. From the attachment, you can see that I circled a capacitor. The reason I circled it was that it reads "OL" (In resistance mode). I changed it, but the issue persists. This is the opposite of a short, right? Just trying to wrap my head around it, which is painful, by the way. Lol. Any explanation why this might be the case? Thanks in advance!
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If the adapter light goes off,definitely you have short on 19V rail. Check resistance to GND on the dc jack itself. Sometimes the protection diode just after the dc jack gets shorted and under such case,all caps connected to 19V will show OL. -
Double checked the dc jack and it's good. This is a weird case. The capacitor in question is the only one reading OL. The one other thing of interest is I'm getting 19 ohms reading on several points on the 19v rail, but nothing any lower than that. This really has me puzzled.Comment
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There is nothing weird and nothing to puzzle about. A ceramic capacitor will always read "O.L." out of circuit, and this bootstrapping circuit is simply designed like that. Usually there is way more to consider and most of the time It does not work like that with this two-dimensional "solution".Originally posted by Maximasraine View Post
19 Ohms at the Main Power Rail is a partial short, usually caused by a shorted high-side mosfet and likely means bad news for you.Comment
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