My new battery finally arrived...
The device has been in the cupboard for a few weeks while I waiting.
Now when it boots all I get is this:
Quote:
U-Boot 2014.04 (Jul 24 2018 - 06:41:12)
CPU: Freescale i.MX6SL rev1.3 at 792 MHz
CPU: Temperature 38 C, calibration data: 0x58c5135f
Reset cause: POR
FRED::: EXTCSD177=0, 179=48FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
Board: Heisenberg
Board Id: P0011807xxxxxx
S/N: G000Kxxxxxxxxxx
I2C: ready
DRAM: MR5=0x6,MR6=0x3 512 MiB
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I tried swapping the new battery in, it does the same thing. Actually a small difference...the new battery boots it, the old one doesn't which seems to point me to the charging circuit.
I also now have a hot air gun so some reflow on the weekend might be in order, as suggested by knc1
I will disconnect new battery and investigate the charging circuit further with a better magnifier.