Does this voltage fix also work with an LM317??

Original transistor is : 2SB799

hFE Classification: MK 200-400

Greetings from Lithuania

Hi Sven! Are you from Sweden by any chance? If so please contact me by email. ...Ronny

Tell me, it still works on your car? I saw brownish color on the board behind transistors, resoldered them but asumed that won't work... This is an easy fix if works... So you said it's first and the last pin where you connect the step down? I see there is no - wire on last picture... where did you solder that pin?

Bravo !!

Hey Sven337. What is the number of the transistors that works? I cant find them on internet and need to order some. Thanks

Hi Sven,

I did as per you instructions and orange lines appeared VFD. Tried to change voltage on buck module but then numbers are unreadable. Any ideas why?

Is there a video that shows tearing down the instrument board itself ? Thanks..

Thank you for this valuable information. You are right the resoldering is very short term. Added the step down module but did not remove the transistors and the dimming function still works.

Thank you very much for this explicit and useful post. I was ready to change the transistors when I found the post. I chose the version with switching source and everything works perfectly now.

Thank you for the guide! My clock is working again.

Thanks Sven! I'm gonna try to fix my Yaris clock using this guide and I don't doubt it's going to work. I bet Toyota hates you much though :)

Thank You Sven, very youseful.I did not removeed the transistors and the dimming work.MP1584EN from Aliexpress is fine.

A few years later but thank you. Worked great. Everything like you said but didn't remove the transistors so the dim fuction is working.

Hello, Did anyone has solve this problem until 2023? I was tryed this method but when i simply add voltage to black connector like in picture then nothing happend już leds from marks turn on above lcd and others but lcd looks dead.

is this lcd can be bought or replace ?

Hi, on my Yaris 2004, 1.0 had simmilar problem. Digital Speedometer not working. I don't see: speed, tachometer, fuel level. Only two line on VFD lighted red light. Regards Adam.

What model vfd IT is?

Hello,

Thank you for Your input and solution, Sven!

Do you also get temperature-, consumption-values, as it originally is?

I have the same issue. On my workbench I replace the 6 transistors. Some data: - power supply - 14.6 V - voltage C-E 11.3V - current 0.042A per transistor, total 0.25A for heating of VFD. - approx 0.46 W dissipation power per transistor.

I decide to cut a cooper heatsink for the 6 transistors and solder it to the tab of each one.

Thank you.

You are a professional. I followed your instructions, and it worked. Thank you.

It's been a long time you shared that fix and it remains up-to-date, I did it today. Thank You ! I removed transistors & resistors all around the burnt area (didn't even try to fix them), soldered and insulated the buck module found on a famous chinese online shop, and there you go ! It worked right away and I can tell, as a bonus, that dashboard light dimming when I switch headlights on, still works. It took more or less one hour to carefully complete that job. One again thank you Sven !

It's been a long time you shared that fix and it remains up-to-date, I did it today. Thank You ! I removed transistors & resistors all around the burnt area (didn't even try to fix them), soldered and insulated the buck module found on a famous chinese online shop, and there you go ! It worked right away and I can tell, as a bonus, that dashboard light dimming when I switch headlights on, still works. It took more or less one hour to carefully complete that job. One again thank you Sven !