2020 iRobot Roomba i3 - need guidance

[Synoptic]

Hi there ! In an attempt to repair a 2020 Roomba i3, I would like to seek if someone here wants to help me.

Symptoms : Looks stuck in a boot loop. (led does circle, then stops for 1 second and redo the same circle).

I have opened up the machine and already started probing the PCB.
Probing some of the Test Points on the PCB, I found a serial communication channel that spitted out some information : see https://pastebin.com/eQiVSRGB for a log capture.

The serial stuff comes from the big STM32F303, probed on TP2

I was hoping to find a bootloader message or something that could help me find something like a corrupted boot image or something, but nope.
https://imgur.com/a/QNYgkPv

[markusdd]

surprised no one commented here: are you still debugging this?

The log messages show one error consistently: it complains about some 'emitter control' being busy and then there is this error, all of this somehow points to the charging circuit:


[DBG] [SFTY] Emitter ctrl 1: Busy, will try again 0M)
[DBG] [CEM] sending turn ON cmd at 111M6U
[DBG] [CEM] ERROR send cliff emitter control 1 failMab
[DBG] [power_board] onlineM/P
[DBG] RPC Switched pwr voter 2 set vote to 1MG.
[DBG] [DM] saw charger contacts rising 1 falling 0, keep emitters onM`
[DBG] [bin] insertedMA4g
[DBG] [bin] voter 2 votes to turn bin emitter 1 (1: on 0: off)M;
[DBG] [safety] onlineM2TD
[DBG] [SFTY] initial safety cliff cal requestedM18P
[DBG] [SFTY] cliff cal read ctrl: send successM
[DBG] [SFTY] init done!M*R
[DBG] [SFTY] Emitter ctrl: send successM)E


I am not sure when they say emitter they mean emitter of a transistor, possibly some software speak for some event happening or so.
have you checked the circuitry around the battery?

[Synoptic]

Hi! I stopped debugging and sold the robot.
The emitter in my opinion is the high-level definition of some infrared sensor that detects voids/edges (stairs for example).

Without schematics and a comprehensive manual, this mission was getting too difficult for what it was worth.

Thanks for your help!

[markusdd]

sure.
yes without any docs this kind of stuff can get almost impossible to track down, good catch on the log though...this is wayyyyy more than you usually get.