PCB Component repair

[tommo]

Hi,

New here and looking for help with a repair to a component on PCB. Visually inspected it and found a blown component think its was a resistor like the one next to it see picture. Howerver the manual doesn’t have PCB schematic. Is there any other way of finding out what size it was as there isn’t much left of it to tell. Obviously got to remove the silicone coating, any advice on that as well I no this might not fix the problem as there are other things that might be damaged.

Thanks

 

[Bones]

Hate to say it but it looks like the circuit traces to the component are gone as well.
Those must be there for it to have a connection or it won't work, it's not as simple as just replacing it. The replacement has to have these to solder the connections to for it to work, I'm not saying it can't be fixed period but it does make it alot harder to do.
Also noted it even looks like it burned down through the substrate of the board affecting other circuits.
From what I'm seeing chances are related to the PCB board itself, it's a goner.

 

[AsRock]

Need to clean the area to start with, Bones maybe right in what he's saying, that silver spot might be whats left and i guess there is only one way to find out.

Looks like it's R126 so a resistor.

 

[Bones]

It does look like it burned a hole down into the PCB and if that's the case, yep - It's done.

 

[micropage7]

what pcb, if just 1 layer there's a chance you could work it out but if it's more than 1 layer, it's gone

 

[xrobwx71]

You also need to find out the cause. Nothing worse than going through the trouble cleaning, repairing, or replacing, then powering on, and bam, it happens again.

 

[tommo]

Thanks for the input nice little crater its left seems like its the PCB extinction event. Will clean it up and post a pic. See if i can be rescued. But finding the cause is outside of my skill set so would have to cross my fingers.

Is R126 a resistor I can but off RS or the designation of that one on the PCB?

 

[skizzo]

Thanks for the input nice little crater its left seems like its the PCB extinction event. Will clean it up and post a pic. See if i can be rescued. But finding the cause is outside of my skill set so would have to cross my fingers.

Is R126 a resistor I can but off RS or the designation of that one on the PCB?

I hope someone corrects me if I am wrong but I think that "R126" is more of a generic labeling system for use during manufacturing the PCB. As in they are visual indicators of where a robot is going to place the designated resistor. You should notice other resistors on the PCB will all be sequential digits, evident of the adjecent resistor labeled "R127". I think you need to be able to see those color rings on the component to tell you what its actual value is, which would tell you what to buy as a replacement. that or a circuit diagram would certainly take the guess work out. Seeing how it looks like the resistor in question was literally melted to oblivion I don't think that method is going to work for you. you might be SOL. either way, clean this mess up and go from there. honestly I'm no expert but this looks beyond repair as others suggested. might be better to just cut your loses unless you are just doing this as a tinkering learning experience and do not care if you come up empty in the end. if you really need whatever this is to be working, you might want to just buy a new whatever it is lol

 

[tommo]

Thanks for the input on this contacted Toyota and the said they don’t have PCB schematic themselves. The only way is a new one. Also noticed more damage after my orginal post which was beyond my skill set.

Thanks everyone ✌