hi folks, need some help...
i got 3 devices, now only 1 works, here is the story...
each device has a main board an a "wired connection" board that is attached by ribbon cable, the device measures fluid levels and tempreture levels.
i "must have " shorted out something on the wired connection board and since then the device dont register fluid correctly and creates a thermal overload then a tempreture error... this board has 1 op-amp and the main board as a handful of them...
i connected the "wired connection board" to another main board thinking it has less that could be wrong with it as its only got a couple of chips, now both main boards dont work!
as the problem is with values of measurement im going to assume its one of these thats causing the problems, 1, power rail to some op-amps missing, 2,faulty op-amp, or 3, damaged processor...
if i was to use diode mode and note down the readings on the good board, could this damage the op-amps? if i had something to compare reading from a working vs non-working i'd have a better idea where to start to fault find...
i tried the manufacter, they just ignored my request for help of a schematic diagram even though its way too old of a device for them, sadly my guess is that its because its a security device..
pictures, chip markings etc can be uploaded, i dont know what other information someone may be in need of...
many thanks Ian