644 Main LCD Not Lighting Up

Discussion in 'TASCAM DIY Repairs and Mods' started by delinreid, Mar 26, 2023.

  1. delinreid

    delinreid New Member

    Mar 2023
    Tascam 644
    Hey Everyone,

    Got a 644 a little while back, and finally got round to building a power supply for it. Plugged everything in and that machine lights up and buttons function, but neither of the LCD panels are lighting up. I haven't tested audio yet. Anyone got any clues?

    Another thing to note, the power supply is sending +/-15v, 7v and GND. Supposedly, this is acceptable, is this the case? Is there a chance I've sent too much voltage to the LCD and fried it? It did power up for a split moment a handful of times upon turning on the machine, but it no longer does so.

    All advice is very welcome - thanks!