Dashboard Clock goes off? - Toyota Yaris Forums

sven337 · 11-24-2018, 06:19 AM

I solved the problem.
Looks like I was right, these are 2SB799 PNP transistors. I couldn't source them so I bought an equivalent BCX53 reference. I think it even has a somewhat higher nominal current so it should be better than the original ones.
I replaced the 6 transistors with these and everything works perfectly now!

Total time all included around 2h so it's a quick fix too.

My notes on how to disassemble it:
- take out the two side plastic parts (passenger airbag and warning button), these are just plastic clips so pull towards you
- remove the cover of the speedometer by pulling towards you (takes some force)
- remove two screws holding the meter in place
- pull the meter out, you need to rotate/warp the plastic a little
- go back to your desk and remove 2 screws at the back of the unit + the clips
- pull the back of the unit, be careful there is a mirror inside that is going to fall off
- disconnect the "mainboard" (10x10cm board, just pull it out it will disconnect)
- remove 1 screw on the front cover, then remove the front cover (many clips)
- remove the plastic cover of the main display (4 screws + 1 clip + rotate it)
- disconnect the ribbon cable of the main display and note what path it takes
- you can now pull out the power board/main board by removing the two clips and pulling towards you, which will disconnect the clock VFD

change the transistors, do everything in the opposite order, get the champagne out.

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11-24-2018, 06:19 AM	#10
sven337 Drives: Yaris Join Date: Feb 2014 Location: France Posts: 33	I solved the problem. Looks like I was right, these are 2SB799 PNP transistors. I couldn't source them so I bought an equivalent BCX53 reference. I think it even has a somewhat higher nominal current so it should be better than the original ones. I replaced the 6 transistors with these and everything works perfectly now! Total time all included around 2h so it's a quick fix too. My notes on how to disassemble it: - take out the two side plastic parts (passenger airbag and warning button), these are just plastic clips so pull towards you - remove the cover of the speedometer by pulling towards you (takes some force) - remove two screws holding the meter in place - pull the meter out, you need to rotate/warp the plastic a little - go back to your desk and remove 2 screws at the back of the unit + the clips - pull the back of the unit, be careful there is a mirror inside that is going to fall off - disconnect the "mainboard" (10x10cm board, just pull it out it will disconnect) - remove 1 screw on the front cover, then remove the front cover (many clips) - remove the plastic cover of the main display (4 screws + 1 clip + rotate it) - disconnect the ribbon cable of the main display and note what path it takes - you can now pull out the power board/main board by removing the two clips and pulling towards you, which will disconnect the clock VFD change the transistors, do everything in the opposite order, get the champagne out.