# Taz 5 went black **URL:** \ **Category:** LulzBot TAZ\ **Created:** [August 20, 2016, 5:53pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881 "2016-08-20T17:53:06Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![shellac](https://avatars.discourse-cdn.com/v4/letter/s/a88e4f/32.png) [@shellac](https://forum.lulzbot.com/u/shellac)\ **Post date:** [August 20, 2016, 5:53pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881/1 "2016-08-20T17:53:06Z")
all 3 fuses have continuity, power supply is green. Any suggestions? ---
**Author:** ![piercet](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/piercet/32/12_2.png) [@piercet](https://forum.lulzbot.com/u/piercet)\ **Post date:** [August 20, 2016, 5:58pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881/2 "2016-08-20T17:58:44Z")
Need much more info. Is the LCD only dark, or is the Rambo board dark too? Do you have the USB port plugged in? Does a computer detect the arduino? Is the main power lead plugged into the board how the ohai kit documentation shows? ---
**Author:** ![shellac](https://avatars.discourse-cdn.com/v4/letter/s/a88e4f/32.png) [@shellac](https://forum.lulzbot.com/u/shellac)\ **Post date:** [August 20, 2016, 6:02pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881/3 "2016-08-20T18:02:41Z")
Screen is dark, the usb detects but cannot connect to the print console, power supply is connected the same as it has been for the last year of printing. ---
**Author:** ![piercet](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/piercet/32/12_2.png) [@piercet](https://forum.lulzbot.com/u/piercet)\ **Post date:** [August 20, 2016, 6:17pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881/4 "2016-08-20T18:17:26Z")
Dark, not lit up solid blue? Sounds like you might have a failed power regulator on the board on the mains power side. Maybe a bad mosfet? ---
**Author:** ![shellac](https://avatars.discourse-cdn.com/v4/letter/s/a88e4f/32.png) [@shellac](https://forum.lulzbot.com/u/shellac)\ **Post date:** [August 20, 2016, 6:20pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881/5 "2016-08-20T18:20:26Z")
yeah, black, the red light in the control box is not lit either ---
**Author:** ![piercet](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/piercet/32/12_2.png) [@piercet](https://forum.lulzbot.com/u/piercet)\ **Post date:** [August 20, 2016, 6:37pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881/6 "2016-08-20T18:37:18Z")
Sounds like something got heat cooked, which won’t trip the fuses. Was this machine in an enclosure? Was the box vented? ---
**Author:** ![shellac](https://avatars.discourse-cdn.com/v4/letter/s/a88e4f/32.png) [@shellac](https://forum.lulzbot.com/u/shellac)\ **Post date:** [August 20, 2016, 6:51pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881/7 "2016-08-20T18:51:29Z")
no enclosure, vented. This machine has been running almost 24 hours a day for about a year and a half in the same spot in my studio. this is the first time it’s ever done anything weird on me…although I did shear a stepper motor once. ---
**Author:** ![shellac](https://avatars.discourse-cdn.com/v4/letter/s/a88e4f/32.png) [@shellac](https://forum.lulzbot.com/u/shellac)\ **Post date:** [August 28, 2016, 6:24pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881/8 "2016-08-28T18:24:13Z")
My control board went down, replace and I’m up and running. although, it wont read a SD card now…?? ---
**Author:** ![kmanley57](https://avatars.discourse-cdn.com/v4/letter/k/13edae/32.png) [@kmanley57](https://forum.lulzbot.com/u/kmanley57)\ **Post date:** [August 28, 2016, 6:26pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881/9 "2016-08-28T18:26:03Z")
Check the polarity of the small ribbon cable for the LCD you may have it backwards in the CB. ---
**Author:** ![shellac](https://avatars.discourse-cdn.com/v4/letter/s/a88e4f/32.png) [@shellac](https://forum.lulzbot.com/u/shellac)\ **Post date:** [August 28, 2016, 8:19pm UTC](https://forum.lulzbot.com/t/taz-5-went-black/3881/10 "2016-08-28T20:19:11Z")
BAM! Thanks! It wasn’t the polarity, but unplugging the small ribbon and re-seating it fixed the issue!!!