BOSS unit not displaying metrics properly 1993 753

[Zanecr]

Hello,

1993 bobcat 753 boss unit not displaying metrics properly.. This bobcat has been an ongoing project, so I have been putting off messing with the boss unit. The first issue was that it was displaying a EP-3 code, oil pressure sensor wiring not connected, which it was.

I hadn't dove into fix that issue yet but, one day I welded in a new section of metal for the seat in the cab as the old one was rotted out. my grounding clamp was right next to my weld, and battery was disconnected.. After welding, the machine no longer beeped at me and does not display the code anymore as well as the metrics being way off / missing now. My guess is something was messed up when welding? The machine still runs as it did before the boss unit started acting up.

I have checked all the connections and cleaned them, as well as grounds. I have 12v for the backlight pin and 5v at the orange wire going to the LCD.

Attached is a picture of what is shown when the machine is running.

 

[Zanecr]

bump

 

[Flathead56]

I sent my Boss display off about a year ago to the repair guy in Florida and he was able to repair it to work like new. It was pricey (aprox $700) but works great now. Communication was by email as they did not answerphone calls.
Here is the info
ISOSCELL Corporation
[email protected]
+1 401-203-3222

 

[Markle]

Thanks flathead56. I was searching for a used or new replacement LCD screen yesterday, worldwide, and they don't exist. It's good to know they can be repaired.

 

[Markle]

I traced the 2 wires in back of the LCD display numbered with 12xx and they both go to the control operating black box. From there, they cannot be traced to origin. Fuel, oil, engine temp sensors all go to this box. That box is behind the seat under the cab, very close to your welding area.

 

[aivaras]

Hello,
How you solved this problem? I hawe too this problem...