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".
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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Title:
Capacitor detached from PCB – RTX 2070 Super Founders Edition
Description:
During maintenance on an RTX 2070 SUPER Founders Edition, I found a capacitor lying on my desk after reassembly.
I did not notice it detaching, so I am unsure of its original location on the PCB.
Procedure performed:
- Removed backplate
- Cleaned heatsink and PCB with isopropyl alcohol + soft ESD brush
- Reapplied thermal compound
- Reassembled card
Observed behavior after reassembly:
- GPU powers on and operates normally under... -
Dead PS5 CFI-1216A, only 12v present on the board EDM-033
Blown capacitor which is located 'under' HDMI Decoder IC on the other side of the board. Does anyone know what is the value of the capacitor, please? Pics included.
Thank you... -
Hello.
I have this HP Omen 17-an108nc that show 3long and 2 short/memory error/ led blinks on Caps-lock after capacitor short on 5V line.
Come with one shorted capacitor on 5V line. After replce it just blinks memory error. i flash main and EC bios but still the same. I have all voltages on start, cpu fan spining, but onli capslock blinks and no picture
any hint? -
Hi people, I hope this is the correct spot to post this, I'm new to the forum.
I have an RTX 3080 Founders Edition which has a burnt up capacitor (it was in parallel with another capacitor which appears damaged too), so I am hoping to be able to identify the capacitor values and order replacements.
I hope these photos make it clear which component I am referring to:
(yes, the soldering is a bit botched from removing the blown one, I know)
I have found the board schematic (attached), but there does not seem to be a boardview available. I have never... -
I check PPBUS_AON and there is a short present on the line, the computer shows a short when testing for short to ground, so when I inject voltage into the line, I get 0AMPS so no short is showing up. I have replaced a blown cap on this board that exploded and tested for the short and it is now removed. Any suggestions? I tested voltage at the line when the fuses are connected and I am getting 1.2 Volts at the line.
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