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Why is my Quest 2 not turning on with no light indicator?

I apologies for the long description, but I'm a bit confused by this issue and would like some advice from the local community, so I've added a lot of detail.

Preamble:

I recently attempted a battery repair on a Meta Quest 2. The reason for the repair was a flashing red light on the device (which googling seemed to determine a critically low battery). At this time, it would only flash when I attempted to turn on the device (no boot screen, no sounds, just flashing), no matter how long I tried to charge it for. I attempted to hold down the power button, nothing. I attempted a forced restart (Power button + Volume -), nothing. So I went to replace the battery.

The battery repair went well (I think). I was a bit concerned when I attempted to power up the device after the repair and no light indicator came on this time. So I disconnected the new battery and connected the old without completely taking apart the Quest again. The flashing red flight came back which made me believe the critical battery warning is now gone with the new battery.... However, now it seems like this wasn't the only issue with the device as it still won't turn on.

I probed the motherboard after the battery repair and it seemed the Caps had power and the CPU got ever so slightly warm (never hot) when I was attempting to charge).

Some Power Debugging:

I have a USB power monitor, when I would use the USB-C monitoring section of the device, the power monitor would constantly power cycle (indicating the device would pull power, then quickly stop pulling power). I thought I was clever and used a USB-A charing brick with a USB-A to USB-C Connector so that it would bypass the USB-C communication chip and only pull 5V (1.5-3A). This made the power monitor stop restarting, but the Meta Quest 2 seemed to be showing the same power-pulling behaviour as will USB-C. It would spike to about 1.3A, then drop to ~0.2A for a few seconds, then drop to 0A. This cycle continued for a while until I left it over night, where it would then only pull 0.2A followed by 0A.

I am unsure what else I can replace or do to debug as there isn't a lot of information online for this behaviour. I originally thought that maybe Meta locked the batteries to devices, but looking at videos online it seems other people just swapped the battery and BAM, it worked (would have been nice).

Please let me know if you have any other questions and I'll try my best to answer.

Thanks

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Hi Austin, Here are a few things.

  1. Battery issue: Even though you replaced the battery, it's still a possibility that either:
    • The new battery is faulty.
    • The connection between the battery and the motherboard isn't secure.
    • During the repair process, the battery might have been damaged.
  2. Motherboard issue: Your power debugging with the USB monitor suggests some irregularities in power draw. This could indicate problems with the motherboard itself, such as:
    • A damaged USB-C communication chip.
    • Faulty capacitors (mentioned in your post).
    • Other circuitry problems on the motherboard.

Since you attempted a battery repair yourself, it's also possible that you might have dislodged or damaged other components during the process.

Here are some suggestions for next steps:

  • Double-check the battery connection: Ensure the new battery is securely connected to the motherboard.

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