Faulty SHURE ULXP4 Radio Mic Receiver. Nothing on the Display or LEDs but backlight on.

My friend Detlef found this SHURE ULXP4 Radio Mic Receiver at the flea market. But it doesn't work. He asked me if I could come to the rescue...

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I work in collaboration with:
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   / @theelectronicschannel  

Det Builds Stuff -    / @detbuildsstuff   (Detlef)
Retro Upgrade -    / @retroupgrade   (Carlos)

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Equipment used in my videos. These are affiliate links, you pay the normal price and I make a small commission.

DM40C
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Aneng AN870 (Same as Zoyi ZT219)
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Zoyi ZT-DQ02
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WinAPEX 268B Clamp Meter
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VC480C+ MILLIOHM METER
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MESR-100 ESR METER
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4KV Breakdown Tester
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LED Backlight Tester
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NI-210SC Curve Tracer
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NI210SJ (cheaper option but watch my review)
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FNIRSI 1014D SCOPE
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Nice-Power Dual 120V 3A PSU
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PROS'KIT SS-331H
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DESOLDER BRAID (I use size 8045)
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Richard