Re: Kind of a different question...
Did you set to AC Micro Amp scale?
Did you set to AC Micro Amp scale?
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Last edited by budm; 04-24-2021, 09:58 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809 -
Re: Kind of a different question...
humor me - try it with other meters
or scope the laptop casing!!! - no need to use the ground-clipComment
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Re: Kind of a different question...
wow - that's a nice sine!!
notice it's 60Hz too.Comment
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Re: Kind of a different question...
what confuses me is that psu's usually couple the output negative to the rectified side of the input.
so you shouldnt see a 60Hz wave.
at worst you should see a 100Hz rectified sine with lots of dampening from the primary cap!Comment
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Re: Kind of a different question...
Really doesn't matter if it's AC or not, just matters how much absolute current can pass through. Ideally that capacitor is small enough (in capacitance) that no more than 1mA will pass through or so, with any "proper" AC voltage presented at the input.
If you plug it into a GFCI outlet, short the case of the laptop to ground, and it trips, then you know you have a problem...Comment
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Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
sigpicComment
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Re: Kind of a different question...
Well it's normal to see a 50Hz or 60Hz backgroud due to the house wiring.
Just so you don't confuse yourself you might want to watch this video.
https://www.youtube.com/watch?v=yKb7xIsPjVM
The filter that stj mentions is present in all hand held meters.
But a scope will not have it, and this picks this noise up, same for a high-end bench dmm."The one who says it cannot be done should never interrupt the one who is doing it."Comment
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Re: Kind of a different question...
Thank you for that video. It makes perfect sense. But I'm not sure how this phenomenon applies to my readings when I have the meter on current reading vs. voltage reading. As we saw, the voltage reading was consistent between the Fluke meter and the oscilloscope ... and I can't take a current reading with the scope to demonstrate that the ZERO reading I was getting from the Fluke was due to the fact that it averages the reading over one power cycle...
However, I suppose it stands to reason, that where there is voltage, there has to be current ... and where the Fluke reads 6 volts yet 0 amps even at the microamp level ... I suppose this explanation is as good as any ... the other explanation could be that the actual amperage is less than one microamp.sigpicComment
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Re: Kind of a different question...
An update on the original topic here ... I purchased this power cord for my MBP power brick and it has a spring-loaded flat piece of metal that grabs onto the metal disc that protrudes from the charger and I verified that the metal is connected to the ground pin on the plug. When I connected it to my charger and plugged it in, the vibration that I was getting from the chassis is now gone ... so it appears that the only way to properly ground a mac book charger is by purchasing one of these cables.sigpicComment
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"pokemon go... to hell!"
EOL it...
Originally posted by shango066Originally posted by smashstuff30guilty,guilty,guilty,guilty!
guilty of being cheap-made!
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Re: Kind of a different question...
i find it interesting that some chinese company has to correct apples mistakes!
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Re: Kind of a different question...
Mine has the the contacts in the plug and they have continuity to plug earth pin. It is a A1466 macbook air, early 2015Attached FilesComment
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Re: Kind of a different question...
that may have earth continuity,
but all the apple chargers i'v seen for the u.s. only have 2 pins.Comment
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The charging indicator light on my ASUS X54H laptop is always on even when the charger is disconnected.
Windows also shows ''Plugged in'' when charger is not connected.
This problem started year ago gradually, when unplugging the charger the charging light took several seconds to disappear, then minutes, and now almost always on even when unplugged for an entire day.
Strangely, before sometimes immediately when plugging in the charger the charging light went away, and later came back with it connected.
If I let battery run out and say it has 3% Windows will... -
Laptop Question
Hello,
I'm working on a Lenovo T460 that has been having trouble charging as of late. Its worked well since I've owned it for a few years. When I went to use it the other day it was dead and wouldn't turn on (was sitting on an Anker 65W GaN charger). After some fiddling with the charger I got it to turn on and start charging, but seemed like the charger was not working as it should (took a few plug and unplug cycles to get it to start charging).
A day later it was dead again and wouldn't boot/charge no matter what I did. No lights or anything when... -
The ISL88739 & ISL88739AHRZ are a highly versatile combo battery charger
configurable for operating as either a Hybrid Power Boost (HPB)
charger or a Narrow VDC (NVDC) charger, supporting 2-, 3-, or
4-cell batteries. Both configurations allow the battery to work with
the adapter together to supply the system load when it exceeds
the adapter capability, referred to as system Turbo mode. HPB
charger configuration reverse-boosts battery energy to the system
bus to help the adapter provide the system power in Turbo mode.
NVDC charger configuration...11-05-2024, 03:28 PM -
Hi, I have a Dell Inspiron 7567 LA-D993P that I've just got running.
There was corrosion around PU1503 which shorted PC1518 & blew PL1504. (Reference pictures attached)
I've replaced PC1518 & PL1504 & the laptop is now running however I now have another issue.
Here are the tested scenarios:
1. With the laptop running on battery, I plug in the 150W charger & the charger shuts off (no LED, protection mode) but the laptop remains running on battery.
2. With the laptop off, plug in charger (LED says on) & the front charging... -
ISL6257HRZ ISL6257HRZ-T Laptop Battery Charger Datasheet
Highly Integrated Narrow VDC Battery Charger for Notebook Computers
The ISL6257HRZ ISL6257HRZ-T is a highly integrated battery charger controller
for Li-Ion/Li-Ion polymer batteries. ISL6257 is designed for
Narrow VDC applications where the system power source is
either the battery pack or the regulated output of the charger.
This makes the max voltage to the system equal to the max
battery voltage instead of the max adapter voltage. Operating
at lower system voltage can improve...11-05-2024, 04:43 PM
Comment