Volvo480ES 2.0 1994 edition B20F engine.
Having had success with the replacement ECU, the engine now runs, so onto the other bits, one being the info centre.
When I first got the barn-car the info centre was visible if you shone a bright light at it, so was just the halogen bulb failed, replaced that and at that point it worked. Since then about 8 months have passed and now have the engine working, but the info centre has died completely, so LCD at all, backlight still working.
So I've removed the dashboard, info centre, etc, and re-flowed the majority of connector solder points, reflowed the ribbon cable connections and any other joints that looked a bit dodgy.
I've also replaced the 16v 100nF capacitors on the info centre computer board.
Put it back in the car, and still nothing. So I then started to press at the back of the board and at one moment I did get the display light up, however it wouldn't respond to changes to the info selector or do very much.
I was pressing around the red highlighted area, so suspect poor connection somewhere, my thoughts there are either the 6 pin/socket on the left that feeds signal through to the info centre LCD module itself (The green there was a telltale, I cleaned up the contacts, etc, maybe not enough? Although continuity meter seems to show good connections).
I also don't have the fuel gauge lit up either, is this separate to the info centre computer, so could you get one without the other? The fact both don't work make me think it's the LCD module rather than the infocentre at fault?
I did take the whole LCD module apart too, and I'm wondering if the friction connector that presses onto the LCD itself is faulty/not making enough contact?
So, I guess the questions I'm after if anyone can help:
- should the info centre temperature, mileage work independant of the fuel gauge, proving either the infocentre computer (in white box at back of cluster) or the LCD/bar system itself?
- What are the inputs/pin to voltage test on the console and info centre? Wiring diagram would be a big ask, but amazing if anyone has it
- Is there a simple way to bench test? I have electronics test gear and stable/regulated 12v supply that I can apply, if there is a way of applying this safely and testing if I get an output from the infocentre display, again pin-outs would be good if anyone has them.
- Is the infocentre/dashboard paired to the ECU? Since I've changed the ECU out is there anything to do (I doubt it being this age, I'm more used to modern cars and use opcom, autel, etc, to re-pair the relevant components)