Saving a 3400c logic board

[helmetguy]

Anyone with access to a 3400c logic board and a multimeter - could you please let me know where the circled pad shorts to?



This pad on my logic board was forcibly removed with a lot of heat by a previous owner, and I'd like to know where I could bodge the (previously) connected resistor to.

From my uneducated probing, the pad may short to a pin on the RAM chips to the right.

 

[MacUp72]

well as there are no schematics available this ia trial and error..as your pad leads under the chip. Maybe you could share some good photos of the whole board, especially from the upper left corner where the keyboard ribbon cables connect to. You already may have looked into other threads here..the green Varta of death-pram battery tends to leak and gut its electrolytes over the components under it ( upper right on board) destroying the board.
I had two boards, one chiming, not booting, one dead..
this didnt boot anymore:

 

[helmetguy]

Fortunately the pad doesn't connect underneath the video adapter chip - the trace snakes under the edge of it and connects to a resistor, as I have artfully illustrated here:



Unless you're referring to one of the VRAM chips. One of the VRAM chips on my logic board looks to have been desoldered on one side and then re-soldered, for some otherwise unknown reason. Possibly to (heaven forbid) bend the chip sideways to see what runs underneath it.

Admittedly my thread title is a bit hyperbolic. This logic board is from a machine that still boots, despite the earlier-described damage AND despite it being covered with Varta vomit. In fact the area of the logic board in your photo looks in much better condition than my one. But yeah, all it takes is one detached via to render a logic board useless.

The only issue with mine is that the backlight barely works. So I'm trying to fix the obvious damage instead of mess with the area affected by battery juice (which has been cleaned, and the PRAM battery yanked out of the machine).

 

[herd]

Going by your pictures, that's a test pad. There was never a component connected to it.