MD2 not switching on!

[indianknightrider]

hello all

I have a problem because of overheating my sega, today this is what happened.

I was soldering my rca cabling into the rear of my motherboard and I was holding the iron too long (30 seconds) on one spot, and now my board looks a little melted, I can see black liquid coming out the pcb, now I also can't turn the sega on!

HELP!

Can I use superglue to repair the burnt area? here's a photo. sorry about quality!

[NCrouther]

I can't see anything in the picture, but I am assuming that you lifted a trace. It is possible to repair by finding where the trace goes and soldering a wire.

[indianknightrider]

yes thats right! it's sort of like this photo i attached,

but instead of silver it's like melted liquid black color. I really want to play sega again! what kind of wire do you mean? just regular wires like the ones I used for (L) and (R) audio connections?

You are right about the trace, I used the sega before applying 30 sec heat to the ground point on the rear and thats when It stopped switching on. but how do I reach into the pcb board and solder a wire? it sounds hard.. .. . can It be done from the outside like the photo below?

[NCrouther]

I am not sure what exactly you are asking. There is nothing "inside" the PCB. The light green lines are copper traces under the solder mask that connect all of the components on the board. I believe that you damaged one of these traces. Like wires, the traces carry electric signals. You can use any wire, what you are doing is replacing the trace by connecting a wire between its two ends in parallel.

I can give better advice if you clean the area with alcohol and a qtip and take a clear, high resolution picture.

[indianknightrider]

Here's a clearer photo from around the net (same md2 model). (I pointed to the spot which is burnt on my console, just to the left of the solder on the blue capacitor (Gnd)


So If I soldered the dark green (now black) stripe with regular wire I should be able to get the console responding, I didn't know a trace this small would stop the whole thing from turning on, I will try to carefully connect a small wire for the trace to be linked again, thanks for helping so far.. .. I will let you know what happens!

Is it safe to clean the burnt pcb spot with Isopropyl, I'm worried about damaging the capacitor as It's directly next to the trace and If i clean it might spill under the capacitor and make it smoke?

[NCrouther]

Yes, using Isopropyl is safe. Just let it dry before turning the system on or soldering.

[indianknightrider]

Thank you so much! IT WORKS!! MY Megadrive II is now working !! I just played Aladdin so It's working! (in black and white) I also modded for ntsc thats why but I have a switch and I can go back to color If I want! (in pal mode i have color) THANK YOU SOO MUCH FOR TELLING ME ABOUT THE TRACE!!! I followed your instruction and I noticed that a tiny spot in the rear PCB had a blob of solder which cut the circuit, to be sure I also used a multimeter I knew it was the reason in my continuity test. I just removed the tiny blob of solder which cut the connection I pointed in the picture and I HAVE POWER NOW WORKS!!

THANKS AGAIN I SAVED MYSELF FROM BUYING ANOTHER SEGA!!!

If I could repay you at all I would send a game for free I have 12 cartridges all Pal including Sonic and Knucles with the flippable cartridge on top to add him on 2 and the others!!

[NCrouther]

Great. I am glad you got it working.