Asked
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Hi all,
This is off topic but I know there are a few people here that may be able to help. Please forgive.
I've got a Roomba model 531 and it's stopped working. Completely dead and unresponsive. No light around the start button when it's docked on the charger or when it's pushed to start it cleaning. The charger led light turns on green when the Roomba is placed on it.
I thought it was a bad battery so I bought and installed a new one and still the little guy won't wake up.
Any ideas or am I SOL.
Well, I took the Roomba all apart looking for the circuit board and tested R138. I get 1.2 ohms so it looks good. Just for kicks I jumped this resistor with the charger plugged into the side of the Roomba. Nothing, still dead.
I have all the wheel and brush units pulled out. Does this matter? Do they have to be installed for the charging pulse to start?
Any other ideas? if not is there any place that repairs these little guys or is it even worth it?
The only plug that is needed for charging is the one from the dc charging jack that must be plugged in the main board. It is also nice to have the speaker plugged in but not a must have.
Has the power supply output voltage (22.5 vdc) been verified with your volt meter ?
When plugged into the side of the Roomba do any LEDs turn on at all ?
Remove the battery and then plug the PSU into the side of your Roomba, any LEDs light up ?
Hi Robot-Doc, Thanks for working with me on this. Much appreciated!
With the PSU plugged into the side of Roomba I'm getting 22.5 at J3 where it's attached to the board.
No light at all when I plug in the PSU, not even a flicker. Same with the battery out of the unit. No lights.
Not a lot is known about the dc-dc buck converter components that provide 5 vdc to the MCU. You will be better off getting a ebay 530 PCB and replace your board.
Thanks Robot-Doc. I kinda felt this would end up with me getting a new board.
I didn't know there were so many replacement board for sale though. Looks like a easy replacement process. However I'm a little confused on which board to get. I found a board that says:
"New 630 PCB Circuit Board Fits 510 thru 540 & 585. 620 & 630 REV 8" 630 PCB Riv 8
Then there's a basic 530 that says:
"Roomba 530 Main PCB circuit mother board NEW - 530 510" 530 PCB
Is there really any difference and which would you suggest? Would the newer ver board be a better choice?
There were some additional hardware changes to the 600 models so those boards might not fit in your 531 and some connectors my be different. Your 531 is a basic board with charging plates in the bottom to use with a home base. The 530 board that you show the link to will work in your 531. At the front you can see a black binocular shaped plastic component. That part is used to locate the home base so you're good to go with that one.
One other point, there was no major firmware change in the 600 models so you wouldn't gain any new or better features or functions with a 600 board even if it did fit.
Thanks Doc! Your the best! Off to eBay I go!
Just to wrap this OT thread up, I received a new PCB circuit board yesterday I got from eBay and installed it. A very easy swap once I figured out how to remove Roomba"s shell. After a few hours of battery charging the little guy is happily running around the house and hungerly eating up all the dirt that can be found!
Thanks again!