Electronics > Beginners
laptop power adapter replacements
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wasyoungonce:
If you adaptor died they are easy to repair, mostly it’s the DC power lead.  They can be difficult to take apart. I use hot knife and re-melt them back together.

Most Chinese knock off adaptors are very poor quality if not downright dangerous.  I tried a few and after looking inside them....never again.


Sent using iPhone
LaserTazerPhaser:

--- Quote from: wasyoungonce on May 17, 2019, 12:26:07 pm ---If you adaptor died they are easy to repair, mostly it’s the DC power lead.  They can be difficult to take apart. I use hot knife and re-melt them back together.

Most Chinese knock off adaptors are very poor quality if not downright dangerous.  I tried a few and after looking inside them....never again.


Sent using iPhone

--- End quote ---

Aren't many bricks potted for greater thermal transfer?


--- Quote from: Richard Crowley on May 16, 2019, 12:34:18 am ---Does your mystery load (your unidentified laptop) use a simple 2-pole connector (implying that it operates at a fixed power: voltage/current)?  Or is it something with a more sophisticated arrangement where it negotiates voltage/current with the supply?

If it is a simple 2-pole connector, then it seems likely that any supply of proper voltage and sufficient current will work OK.
Of course it is absolutely mandatory that you get the polarity correct. Else, you will likely toast your laptop as most don't have polarity protection.

Clearly, a fixed-voltage source isn't going to work properly with a load that expects to negotiate the voltage/current.   This is difficult to answer properly as a generic question.

--- End quote ---

Seems only Mac bares those elongated multi connecting charging plugs for laptops. I was referring for ordinary 2 pole connectors.

USB type C should really be replacing these things especially with the availability for magnetic type c adapters. With the great burden of backwards comparability with USB Type A which Type C must operate with - counterfeits are very much in position to do great damage to consumer goods with their faulty, unreliable or inoperable components with which their likely to be constructed with.
wasyoungonce:

[/quote]
Aren't many bricks potted for greater thermal transfer?
[/quote]

Some are most not.  Most use a white silicon type potting on bigger components for mechanical stress.  It’s easy to pick off.  Most bad adaptors have bad connectors it’s usually easy to access the pcb to replace this as it’ll be soldered right at one end edge.


Sent using iPhone
radiolistener:

--- Quote from: blueskull on May 17, 2019, 06:32:17 am ---Buy a good power supply, and buy a Chinese cable, marry them together, and you are good.

--- End quote ---

Most of Chinese cable are very bad for power supply. They has too high resistance which leads to high voltage drop and power loss. Also they bad soldering and requires to use acid in order solder it.

I recommend to buy some good cable from real copper instead of Chinese silumin cables named as "copper".
LaserTazerPhaser:
Meanwell bricks aren't potted?
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