The MP1484 is a switching regulator. When fed from 12 volts it should only require about half the current that the RPi is taking at 5 volts. It is unlikely that the MP1484 itself is the problem which would mean that changing it will not help.wh7qq wrote: ↑Sun May 27, 2018 5:49 amAlthough it is not pretty or convenient, probably the best bet is to have separate supplies for the 3B+ and the display. The B+ with its onboard wifi, will draw more power than the 3B and that probably taxes the ability of the mp1484 and the 2A supply. Bigger caps won't help and unless you have the ability to do pc board repair, you will probably ruin the display board by trying to change the chip...even if that would help. By the time you add the mouse and keyboard and what other USB things you use to the 3B+, you have probably exceeded the system's current capability. A higher current 12V supply (3-4 amp) might help, or not.
Despite the disclaimer (which I suspect is intended to cover the "95%") the "rated for 0.5A" is meaningless.
None of that is at odds with what I posted.Heater wrote: ↑Mon May 28, 2018 12:18 pmCertainly cables have ratings. They have insulation with a breakdown voltage. They have a current carrying capacity. However that is rated.
That is why the cooker in your kitchen is not connected to the mains with a lamp cord and the cables on your car battery are huge.
A cable is basically a long fuse. Fuses certainly have current ratings.
Pendatism aside, Imperf3kt's comments were apt, in layman's terms. A lot of USB cables out there are so thin that there will be significant voltage drop when drawing the expected current.
It they are not officially "rated" in some way, then we can rate them. Fit for the job or not.
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