MEGADRIVE OVERCLOCK MODEL 1600-05 - CPU PIN 15 TRACE ITS NOT THERE TO CUT???!!!

[Telzzuni]

i am trying to overclock this megadrive, the model is 1600-05 but in the pin 15 of the cpu motorola (68000) i dont hve any trace going to there, so i dont know witch trace to cut...i tried to cut one in pin 6 (that i saw in this tutorial http://kyorune.com/modding/article.php?id=73) but then i had no reboot, and i solded the wires in pin 15(cpu) and b19 and also tried in b15(cart slot) and nothing happens, so i solded again the cuted part, and had the console working again...so i dont know, the trace in in 15 its not there in my model :S can you help me? sorry my english cheers i hope anyone can help me :S

[kool kitty89]

Not sure how to fix pin 6 (which is AS, nothing to do with overclocking....), but if the trace isn't on the top of the board, it's likely on the bottom being a double-sided PCB...

My VA3 model 1 is like that. The other option is cutting or desoldering+lifting the clock pin.

[Telzzuni]

uhmm...well the pin 6 its working, i puted some solder and its contacting with the trace...but about the pin 15 i can not find the trace, i am affraid of cutting in the other side of the board, because i am not sure if it is the right trace...so can i desolver the pin and puted "up" out side the little hole that he is solded? cheers

[Telzzuni]

in your model how do you do? can you identify the trace, or you had to desolder the pin?

[kool kitty89]

I didn't look at it too closely (haven't yet modded), but going from the bottom of the board, just count the pins like on the top. (finding pin 1 shouldn't be hard)

If you still can't find the trace, you can desolder (or carefully cut -or file) and lift the pin to solder to. Be careful not to brak the pin off the chip though. (otherwise you'll have to grind off the package of the chip to get to the internal trace)

[retrogamer343]

Go ahead and carefully lift pin 15. I did not bother with cutting the trace, I just lifted the pin and soldered the new clock speed to the leg of the pin. I did have to de-solder the pin from under the board first and then the pin pulled right up through the top of the board.