MacBook Pro 2019 charging repeatedly disconnects before charging normally

echoladone wrote:

Hello, everyone! Please help. For the last six months, I've been having a problem where when my Mac has 30-60% battery life, I put it on charge and get 5-10 cycles of the charging sound turning off and on, then charging proceeds normally. This has been happening for the last six months. The service center couldn't find the problem, but they saw that this was happening. There are no problems with the 96W power adapter, and the same behavior occurs with the 145W adapter. But if I connect the 45W adapter from the MacBook AIR, there is no such problem. The Type-C cable is also new.

I have a 2019 MacBook Pro 16" with 16 RAM and 512GB.

Was the "service center" an Apple Authorized Service Center? I find it remarkable any authorized service technician would witness the behavior and not be able to determine cause or component involved, especially given the behavior with the 45W adapter. At the very least, the technician would have recommended or performed a DFU restore of latest macOS.

"MacBook Pro 2019 charging repeatedly disconnects before charging normally: [...]The service center couldn't find the problem, but they saw that this was happening. There are no problems with the 96W power adapter, and the same behavior occurs with the 145W adapter. But if I connect the 45W adapter from the MacBook AIR, there is no such problem. The Type-C cable is also new. I have a 2019 MacBook Pro 16" with 16 RAM and 512GB."

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Troubleshooting Mac Power:

A. Black Mac Screen:

Go Here: If your Mac doesn't Turn On or Start Up - Apple Support

Using External Devices: Try Resetting the SMC and NVRAM, but this time, using an external keyboard. Connect an external monitor and see if you get an output.

B. Mac Power Issues:

Try a New Charger:

If it is currently charging from a charger, then use a new charger:

• Power & Cables - Mac Accessories - Apple - Select "Mac Compatibility" on the left
• Find the right power adapter and cable for your Mac notebook - Apple Support

C. A Few Links to Refer to Power:

• If your Mac doesn't Turn On - Apple Support

• How to Turn your Mac On or Off - Apple Support

• About Mac Notebook Batteries - Apple Support

• Charge the MacBook Pro Battery - Apple Support

• If your Mac Battery won't Charge - Apple Support

There is a possibility the USB-C ports are damaged which is very common in my personal experience since it only takes a single drop/splash of liquid to enter the port & corrode it.....and no, you cannot always see the damage by peering into the port. It doesn't even take into account damage from connected accessories. Or it may be a hardware issue with the Logic Board, or possibly even the Battery. Testing with known good USB-C ports (aka I/O Board is the first step since an issue with one port could possibly affect all of the others).

I don't recommend spending any money to repair any USB-C Intel Macs for multiple reasons, but especially not the MBPro 16" (2019) model which has an extremely high rate of Logic Board failures (T2 chip issues, SSD issue, GPU issues, memory issues, etc.). The money spent on repairs is much better put towards a new laptop.

Have you ruled out foreign material in the connector?

The magnetic nature of the MagSafe port on the MacBook Pro can attract debris such as iron filings.