Re: Adding amp meter to a laptop PSU



Thanks for the suggestion, this looks really interesting. The Chinese mobile app scares me a bit, but a quick google search showed me that someone has already reverse engineered the communication protocol: [url]https://github.com/msillano/UD18-protocol-and-node-red[/url]Re: Adding amp meter to a laptop PSU... communication...

Re: Adding amp meter to a laptop PSU

Do you think I should add some additional protection or voltage stabilisation, when I'm already building a box for the meter? Or would it be redundant?



I never had any problem with that at work, but you may be right - my old latitude didn't want to charge from time to time due to bad contact with the center pin. Do you know if the IC could be easily removed from a Dell charger and reused with my power supply? I think I read somewhere that Lenovo chargers use eeprom or flash that communicates directly with the laptop...

Re: Adding amp meter to a laptop PSU

Hi, thanks for all the suggestions.

The meter I had in mind:
[url]https://www.ebay.com/itm/10-50-100-Voltmeter-Amperemeter-LED-Dual-Digital-Amp-Meter-Volt-Messgerat/333778559774[/url]

Here is the PSU, I got it for free from a friend who had no use for it. The model name is PA-1131-08, the connector look like a standard 5.5x2.5 barrel jack.

[url=https://ibb.co/mqG3jBx][/url]

From my experience (in work, I usually fix around 5-10 laptops a week), most of the PC laptops use 19.5V,...

Hi, from time to time I need to diagnose a laptop at home (I have a side-job as a computer technician, but I don't want to bring my personal stuff there). I don't have enough space on my desk for a huge lab power supply (nor am I willing to spend lots of money on a good quality one at this moment). However, I have a fairly decent unused LiteOn 135 W laptop charger.

I was thinking about making a little box with one of those combo volt/amp meters you can get from eBay for $3, and screw terminals or banana plugs for an universal laptop charger cable or cables from defective chargers....

Re: Lenovo ThinkPad T530 - charging slowly and system unstable while charging

Hi, thanks for your reply. I was planning on diagnosing the problem more thoroughly later (I had too little time to do it up until now).

However, I tried to power it up yesterday and it wouldn't post. After disconnecting power and cmos battery for 30 seconds, on the first power on (from battery only) it gave me incorrect time warning, then died immediately and wouldn't post again.

I will try to fix the bios. If there are any issues after that, I'll post another question after...

Hello, I recently purchased a T530 from a seller, who used it for a couple years without battery, just with a docking station. I bought a new 6-cell battery (non-original, but a very high quality one, from a brand with almost 100% reliability).

The laptop at first didn't want to charge with the included 90 W AC adapter while being shut down, but after powering it on it began "sipping" power. When after 5 hours the battery wasn't 100% charged, I wanted to run AIDA, but the laptop immediately powered off. I tested without battery and with just battery (and no charger), both...

Re: New Members - please post your introductions here

Hi, being relatively new to computer component level repair I find this forum extraordinarily useful. Up until now, I didn't really need to post, but an uncommon defect somehow found a way into a lovely ThinkPad I bought used, so I'm hoping to find some help here