kidhazy wrote: > Joe, > > Is there any way to determine if a blank display is the power-supply > versus a dead VFD ? > > One of my Booms has finally died with a blank display (ie. no Logitech > display at re-powerup, and doesn't even resurface after some time of > power off). > > Looking at your great and very detailed blog the VFD replacement is > beyond my soldering skills - but looking to see if there is a way to > diagnose if the power-supply work-around may work for me? > > Cheers.
Hi there, sure, there is. You will need a multimeter though in DC voltage mode. If the Boom is still controllable via IR or via network, the display power supply is the main suspect. If it is no longer controllable, it might have died. Hope that's not the case. If you get down to the mainboard, you'll just have to push the multimeter's negative probe against one of the five screws that hold the mainboard, and the positive (red) probe against one of the three metal pins on the very left (upper corner) of the display. It does not matter which of the three you touch as they are shorted together. You should see around 5 Volts there. Then connect the positive probe to the one of the three pins on the opposite side (right top corner) and check the voltage there. It should be considerable less than 5 Volts. If it is same as on the left side, or even higher, that's the display power supply circuitry failure. The three-diode fix from by blog will help in that case. Please be sure not to have the probe slip anywhere else than the points described. You can easily damage the board beyond repair with a short circuit or ripped PCB lines, so please be very careful there. Wish you good luck, and if you need help, let me know :) Regards, Joe PN me if your Boom / Classic / Transporter display has issues! LMS 7.9.0 on Windows Server 2012 1x Squezeebox Classic SB2 7x Squeezebox Classic SB3 (one waiting for repair) 7x Squeezebox Boom (two waiting for repair) 1x Transporter 2x Controller (one waiting for repair) 3x Touch (two waiting for repair) 1x Radio ------------------------------------------------------------------------ JoeMuc2009's Profile: http://forums.slimdevices.com/member.php?userid=23131 View this thread: http://forums.slimdevices.com/showthread.php?t=106381 _______________________________________________ Boom mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/boom
