Hello all,
My Harley vrod instrument cluster smoked a couple components. Unfortunately the components are physically damaged but I borrowed this picture from the web and tried to enhance it. The component in question is the rectangular device. I know the markings on the component are blurred, but it’s all I have to go by. I’m pretty sure the orange diode to the right is a zener and I think it’s also damaged because the pad lifted and it seems shorted when measured. Any help is appreciated. Thanks

 

Welcome to AAC

Can you take good, straight-on hi-res pictures of both sides of the board. The black component is almost certainly a diode.

 

Welcome to AAC

Can you take good, straight-on hi-res pictures of both sides of the board. The black component is almost certainly a diode.

I took some pictures of the actual pcb that I have. The other pictures were ones I saw on the web of the same area of the circuit board. What happened was I tried to start the motorcycle with a charger hooked up to the battery and the surge caused a very expensive lesson since these parts are not available except for used and questionable parts.
The back side of the circuit board looks good, I’m not sure if it is multi layer or not. I was hoping to try to replace the bad components and hope for the best. My soldering skills are pretty good.

 

ON Semiconductor SMF24A transient suppressor.

https://www.onsemi.com/site/cdroms/micropackages/pdf-docs/onsemi/SMF5.0AT1-D.pdf

 

ON Semiconductor SMF24A transient suppressor.

https://www.onsemi.com/site/cdroms/micropackages/pdf-docs/onsemi/SMF5.0AT1-D.pdf

Yes, I think that's a good possibility, though I read that last digit before the Z as a 2, which would make that a SMF12 for a 6v system or SMF22 for a 12v system. Unless that's failed short its a strong likelihood there is going to be other transient damage to the board - the diode to the right is cracked and the light blue part to the left may have suffered some collateral damage too. A board level replacement may be on the cards.

 

Thanks for the replies, I do appreciate it. I’ll try to clean up the damaged area a bit with a soft brush and some isopropyl and see if maybe markings are easier to see.

 

I cleaned up the circuit board and took some more photos at different angles to try to get a better read on the markings. Unfortunately the blown orange zener fell off during cleaning but I’m sure it’s the same type as the others. I can use some thin buss wire and solder to the trace. The one I’m not sure about is the rectangular zener with the blister. I want to be sure to get the right voltage type. Thanks