Roomba 560 shows no signs of life; R138 seems OK though

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Roomba 560 shows no signs of life; R138 seems OK though

Postby horseflesh » October 25th, 2018, 10:06 pm

I have a Roomba 560 that happily cleaned my room, went home, fully recharged, and then died in its sleep at some time in the next couple of days. There is absolutely no sign of life, no briefly flashing lights when power is applied, nothing. It's deader than Dillinger whether it is on the base station or plugged directly into the charger. I tried the 2-button reboot too, nothing.

After a web search led me to this forum I tore it apart to check R138, which tests at 1.7 ohms. Sounds like that is in the right ballpark?

What should I check next?

Here is some more information but I am not sure how helpful this is.

The Roomba was left forgotten for a couple of years and the OEM battery bit the dust. I replaced it with something off Amazon, which seemed to work fine, but it was after one run with the new battery that it went to sleep and died. But like I said, the robot returned home and charged, and the replacement battery is at 16V. It seems unlikely that the new battery is somehow at fault, but it was the only thing that had changed.

I threw the OEM battery back in to see if I could get any sign of life, but got nothing.

This unit came from Costco and it has "560 Lite" scrawled on the PCB. The number on the bottom case is 551, though.

One sad note: Twice during the last couple of days as it sat charging, I heard a few distant, mounrful notes of a scratchy Roomba tune... Now I realize those were literally its death rattles. If I had paid more attention... maybe I could have saved him.

I hope I can resurrect the little guy so I can give him a Mad Max "I live, I die, I live again!" sticker, and he can ride eternal, shiny and chrome.

Thanks for any help you can give.
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Re: Roomba 560 shows no signs of life; R138 seems OK though

Postby TechGuy » October 26th, 2018, 1:12 am

From your description, the charging circuit of your Roomba is not working. New battery was charged at factory. That is the reason your new battery ran your Roomba for the first mission and nothing after the first mission.

I suspected that water/liquid was entered your Roomba.
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Re: Roomba 560 shows no signs of life; R138 seems OK though

Postby horseflesh » October 26th, 2018, 1:49 am

When I first installed the new battery, I put it on the dock and let it charge overnight. When I did that, it did the pulsing orange glow that indicated charging, and the next day it was green.

After the one cleaning run I did, it returned home and again gave the pulsing orange light, but the next time I looked at it a couple of days later, there were no lights at all.

Perhaps the charge circuit is dead, but the replacement battery is currently at 16V. Shouldn't that give me a sign of life when I plug it in?

If it helps to test, I can charge the battery with an external charger, I have gear for that. But my meter says it's full of juice already.
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Re: Roomba 560 shows no signs of life; R138 seems OK though

Postby vic7767 » October 26th, 2018, 9:51 am

A new fully charged battery should read 17 vdc. Remove your battery and then pull up on all 4 of the batter tangs in the battery well of your Roomba. Install the battery and test.
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Re: Roomba 560 shows no signs of life; R138 seems OK though

Postby TechGuy » October 26th, 2018, 12:43 pm

The best way to determine whether your Roomba is charging or not is using a SCI cable to get information from Roomba while it is charging.

bat: min 2 sec 24 mV 16198 mA 1335 deg-C 10
Positive mA value means charging. i.e. Power is flowing from Roomba to battery

bat: min 22 sec 0 mV 13971 mA -39 deg-C 27
Negative mA value means discharging. i.e. Power is flowing from battery to Roomba. Roomba is drawing power from the battery.

Read Robot Wiki on "Troubleshooting with Roomba SCI Cable" for details
http://www.robotreviews.com/wiki/troubleshooting-roomba

Is there any water/liquid residue on your motherboard?
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Re: Roomba 560 shows no signs of life; R138 seems OK though

Postby horseflesh » October 30th, 2018, 3:36 pm

Thanks for those details, I will see what I can do about verifying charging.

I see zero signs of physical damage to the unit, liquid or otherwise. Anything is possible, but I consider liquid damage to be really unlikely.
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