Dashboard Clock goes off? - Toyota Yaris Forums

sven337 · 05-05-2019, 10:59 AM

OK, this is fixed! Hopefully this time for good.

I had an adjustable MP1584EN-based buck module ("D-Sun" chinese brand).
These super common modules you can find for a few dollars.
For example:
https://www.ebay.fr/itm/Ultra-Small-...-/322408214136

I used my poor man's lab power supply to test what were the minimal voltage and currents needed to obtain full brightness, and I found out that a constant voltage 1.5V supply would yield a steady 300mA current that would correspond to full brightness. Going to 2.5V would increase current to 450mA without any visible change in brightness, and starting at 4V the filaments would glow red.
(Sorry about the quality of my pictures, I was focused on solving the problem and only took the pics as an afterthought).
https://perso.aquilenet.fr/~sven337/...test_setup.jpg
https://perso.aquilenet.fr/~sven337/...k/halfwatt.jpg
https://perso.aquilenet.fr/~sven337/.../2halfvolt.jpg

Once this was proven working, I cleared some space on the board by removing the transistors and their base and emitter resistors.

https://perso.aquilenet.fr/~sven337/...cleanboard.jpg

Laid out a layer of tape to insulate, soldered the module and taped it in place. This fits with room to spare when reassembling everything.
https://perso.aquilenet.fr/~sven337/...lock/final.jpg

Sorry that final picture is so anti-climactic.. Everything works quite well for now. I hope it lasts, this time, but see no reason why it wouldn't.

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05-05-2019, 10:59 AM	#11
sven337 Drives: Yaris Join Date: Feb 2014 Location: France Posts: 33	OK, this is fixed! Hopefully this time for good. I had an adjustable MP1584EN-based buck module ("D-Sun" chinese brand). These super common modules you can find for a few dollars. For example: https://www.ebay.fr/itm/Ultra-Small-...-/322408214136 I used my poor man's lab power supply to test what were the minimal voltage and currents needed to obtain full brightness, and I found out that a constant voltage 1.5V supply would yield a steady 300mA current that would correspond to full brightness. Going to 2.5V would increase current to 450mA without any visible change in brightness, and starting at 4V the filaments would glow red. (Sorry about the quality of my pictures, I was focused on solving the problem and only took the pics as an afterthought). https://perso.aquilenet.fr/~sven337/...test_setup.jpg https://perso.aquilenet.fr/~sven337/...k/halfwatt.jpg https://perso.aquilenet.fr/~sven337/.../2halfvolt.jpg Once this was proven working, I cleared some space on the board by removing the transistors and their base and emitter resistors. https://perso.aquilenet.fr/~sven337/...cleanboard.jpg Laid out a layer of tape to insulate, soldered the module and taped it in place. This fits with room to spare when reassembling everything. https://perso.aquilenet.fr/~sven337/...lock/final.jpg Sorry that final picture is so anti-climactic.. Everything works quite well for now. I hope it lasts, this time, but see no reason why it wouldn't.