Electronic Repair

My HobbyKing X200 Touch Screen Charger has been giving good service for the last 2 years, having
balance charged one LiPo , I started to balance charge another when the screen went blank .
Three pics are attached, one showing where the failure occurred, I'm uncertain if it's a failed component
or just a soldered joint.
It would be much appreciated if someone with electronic knowledge could perhaps see if it is repairable.
Many Thanks
Colin.

Looks like a failed SMT device (surface mount technology) for which I don't have in depth knowledge but know specialist tooling & skills required.

Suggest showing damage to Mitch for his advise.

Hi Colin, try cleaning the area with a cotton bud and alcohol first. There's a bit of print showing through the hazy deposit, it looks like "GND" I think it might be that a soldered joint has failed. The damage looks as though it's been caused by heat, as its appears to be the "GND" connection, that would mean that all the current goes through that single point and it could easily overheat if the connection wasn't good.

Brian wrote: Hi Colin, try cleaning the area with a cotton bud and alcohol first. There's a bit of print showing through the hazy deposit, it looks like "GND" I think it might be that a soldered joint has failed. The damage looks as though it's been caused by heat, as its appears to be the "GND" connection, that would mean that all the current goes through that single point and it could easily overheat if the connection wasn't good.

Brian - Thanks - It is "GND" and the connector pin has 2 pins also marked "GND" and it would appear these are connected to the burnt "GND"
Having cleaned the burnt bit should I then apply a hot soldering iron & hope for the best ?
Colin.

Hi Colin have you tried pressing and tapping the LCD and pressing on the joints with power on. If you think all is lost try unplugging LCD and then reconnecting
Are you getting power to the board.

Best of luck
John

Hi Colin, once the burnt area is clean, re-solder the joint. If you have some resin cored solder it would help get a good joint. A clean joint and a clean iron will ensure a good repair. Don't leave the iron in contact too long though. Good luck.

Presumably the component burnt out, and presumably the component was serving some purpose, my guess is that it's a surface mount resister. Isn't bridging over the failed component with a blob of solder potentially going to lead to greater damage, especially as you don't know why the component failed in the first place?

Hi Colin, Chris has a point there. I zoomed in on your picture of the board, what I thought to be unsoldered contacts were all that was left of the original component. I wonder if the missing bit was a capacitor.? Perhaps you could find a circuit diagram on Google?

Looks to me like the master GND (negative) worked loose and as the full charging current also runs through here it got hot and burnt away the circuits print. I would suggest clean up area with a small fine wire brush and then clean area with meths/alcohol/jack daniels. If there is some print left i would insert a small post or use thick copper wire. Solder this is the best you can. If there is no print left then follow the trace in a bit. If it is wide enough drill a very small hole and then follow my suggestion previously about a post.

Thanks for everyone's comments, since I feel uncomfortable messing with something I don't understand
I'll show it to Mitch when I catch up with him at Cashmoor.

Colin.