Dashboard Clock goes off?

[sven337]

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.

[Sumi]

Originally Posted by sven337

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.

Could you please help me with the exact transistor needed?

These are the ones that I can source:

BCX 53-16 SMD, PNP, 1A/80V
Frequency: 145MHz
Packaging: SOT89
Collector current: 1A
Collector - emitter voltage: 80V
Power dissipation: 1.35W

OR

BC 869 = BCX 53, PNP, 1A/20V
Frequency: 60MHz
Packaging: SOT89
Collector current: 1A
Collector - emitter voltage: 25V
Power dissipation: 1W

Will any of these work?

Thank you in advance!