Sumitomo excavator control unit - broken

[MidletonIT]

Hey guys,
I own a phone and computer repair shop.. A client brought me a control unit for a sumitomo excavator (photos in link below)
The issue is that it wont display the rear camera to the operator
We tested a different control unit in the excavator and it worked fine so we have determined its a motherboard fault in this one
its ~€4000 to replace the unit so ideally we want to fix this one
the problem is I have no access to schematics for this and cant find anything about it online..
its probably something as easy as swapping a chip but I cant do anything until i know what chip does what..
Does anyone here have any recommendations as to what i should do next?
As you can imagine im feeling a bit out of my depth on this one.. phone repairs i can do just fine but excavator repairs are new to me!
https://imgur.com/a/FLZakLv

[Muz]

Hey guys,
I own a phone and computer repair shop.. A client brought me a control unit for a sumitomo excavator (photos in link below)
The issue is that it wont display the rear camera to the operator
We tested a different control unit in the excavator and it worked fine so we have determined its a motherboard fault in this one
its ~€4000 to replace the unit so ideally we want to fix this one
the problem is I have no access to schematics for this and cant find anything about it online..
its probably something as easy as swapping a chip but I cant do anything until i know what chip does what..
Does anyone here have any recommendations as to what i should do next?
As you can imagine im feeling a bit out of my depth on this one.. phone repairs i can do just fine but excavator repairs are new to me!
https://imgur.com/a/FLZakLv

Welcome .. Sumitomo wont help because they didnt make this item clearly ... so who ever makes the control unit is where you will have to go. Sadly as I have found , big companies are very good at making their product suppliers remove any designations from the stuff they make for them .. (although not always) so you might find it hard to ascertain who made it.

Apart from basic microelectronics knowledge which you clearly have, the best I can suggest is that a failure would most likely be caused by its environment with vibration or dirt or water ingress. I assume you have removed the board to look for dry joints, corrosion etc ? and if so, are there any makers marks on it ?

[MidletonIT]

Welcome .. Sumitomo wont help because they didnt make this item clearly ... so who ever makes the control unit is where you will have to go. Sadly as I have found , big companies are very good at making their product suppliers remove any designations from the stuff they make for them .. (although not always) so you might find it hard to ascertain who made it.

Apart from basic microelectronics knowledge which you clearly have, the best I can suggest is that a failure would most likely be caused by its environment with vibration or dirt or water ingress. I assume you have removed the board to look for dry joints, corrosion etc ? and if so, are there any makers marks on it ?

Thank you for the response..

I have contacted sumitomo and have asked for the schematics for the board.. i am waiting for their response but i think it is unlikely they will release them to me

I did a little bit more searching online and i think the manufacturer for the unit is "Case Construction" https://www.casece.com/emea/en-uk
I will attempt to contact them tomorrow

there is no markings on the board itself to tell me who manufactured it.. there are random numbers but they get no results when i type them in to google

I removed the board and inspected it under the microscope and i cant find any issues at all.. It was spotless .. no signs of liquid damage and all pins are soldered to the board correctly..

I took some measurements with my multimeter and cant detect any shorts on the board..

and as far as i can tell they dont sell replacement boards.. only full units

[Muz]

Thank you for the response..

I have contacted sumitomo and have asked for the schematics for the board.. i am waiting for their response but i think it is unlikely they will release them to me

They wont/cant because they wont have made the thing

I did a little bit more searching online and i think the manufacturer for the unit is "Case Construction" https://www.casece.com/emea/en-uk

Case are a manufacturer like sumitomo .. they dont do microelectronics as far as I know ... they would out source that stuff to a specialist

and as far as i can tell they dont sell replacement boards.. only full units

Welcome to the world of plant .. as usual it will be a simple and small component failure like a resistor going high in value, and you are stuffed without being able to find who made it to get the schematic ... may be you will have to be a bit more forensic ....any logos on the board ? mitsubishi etc ?

[Wazza]

Its almost criminal what they charge for some parts these days ,easiest solution might be to install an aftermarket rear camera if practicle.
Or flick through Alibaba pages and find non oem replacement board if they have one .