I’m sad

MicLink Wireless is not powering on

yes, I know it's an old product but I have used it a lot and it's ideal for my needs (hand an old mic to the father of the bride to make his speech etc).
has served me well, and all of a sudden it fails to power up.
I checked the PSU, and even tried with batteries... LED's wont light up.
suspected power switch, so I swapped that for a dpdt toggle, but no joy.
I ran my desolder station heat gun over the ICs in case it's a dry joint. .. LEDs came on for about a tenth of a second, but then nothing again :-(

any chance someone has the schematics/service manual for this? there appears to be no comparable product in New Zealand.
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