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Try this with only one ribbon plugged in at a time and with no ribbons connected.
With your probe on 10x, do you see any oscillation on the crystal oscillator terminals for the MCU?
With your probe on 10x, do you see any oscillation on the crystal oscillator terminals for the MCU?
Still reads 5v with one ribbon at a time and without either
Where would those be? The big pads on either side of it?
Where would those be? The big pads on either side of it?
X901. Metal can (stadium/pill shaped) on the top of the board, terminals on bottom.
Probe must be on 10x (unless you have a 100x probe). The oscillation is fragile and the loading of the scope is sometimes enough to stop it from oscillating. This is inconclusive but there aren't many tests left.
Probe must be on 10x (unless you have a 100x probe). The oscillation is fragile and the loading of the scope is sometimes enough to stop it from oscillating. This is inconclusive but there aren't many tests left.
That generally means that the processor still functions. I'm not sure why you're only getting DC on the pins of the IC.
What DCV do you have on pin 58 of the MCU?
What DCV do you have on pin 58 of the MCU?
It appears that the diode D712 is leaking. Lift one terminal and check it for leakage. Don't power the head unit up with it out of the circuit.
