Hello Eddie.
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Ludwig's suggestion to look at the WIKI doc is spot on.
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I'd check the ohms continuity between ground and each of the VCC and VDD rails first. Remove the SMPS boards boards before doing this and do not apply power or have any other cables or keys attached.
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If too low or especially if showing close to shorts then one or more components on the? main PCB have failed. Tracking those down is difficult. There are several threads where advanced operators have tracked down one or more failed components. Hard and amazing analysis and rework.
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Or, you could contact Jeff Moore for his excellent repair service. Query him at QRZ for his private email address. He revived my QMX+ Rev 1 quickly. I subsequently blew up that one while probing poorly with temperature sensors. The standalone SMPS board checks led to finding one was toast and that one of the rails was shorted on the Main PCB?
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I opted to purchase a 2nd QMX+, a Rev 2, assembled it very carefully and I am back on the air. Now have a component donor main PCB board for future fumbles. :)
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73 GREG KI4NVX?
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