Liquid damage, post logic-board replacement, still doesn't boot
The MBP in question had a soda spill last September. Finally got the correct logic board and replaced it this afternoon. Plugged it in, let it charge for about 30 minutes and tried to boot. Optical drive did its thing (mechanical noises), it made the happy MBP booting up noise (known in my home as the WALL-E sound), and stopped there. The keyboard backlight works, and the LED at the front right corner is turning on and off slowly. I can see the screen is getting power; it's still black, but it's a "powered" black.
My question is, is there something else I should be doing? I have seen several references to a PRAM reset and a PMU reset, both of which were alluded to in situations similar to mine. How do I do these things and would they help?
I heard the sound and got excited. Now I'm down in the dumps again.
5条评论
I would delete this, but I just wanted to give some further information for someone who may be in a similar situation. It turns out that it is booting up and going through the complete process. The machine works fine; it's the screen backlight that's not working for some reason. I worked on this thing in a sunny room around noon. When the sun moved, the room got darker and I could see the image now. Hah! Getting closer.
Now, what would cause the backlight to not work? I'm going to dig back into the guts and make sure all the connections are well seated. Hopefully it's something simple like that. Any other possibilities?
由 David Jonas 完成的
I've been searching all around for a solution to this. One individual had mentioned that he had a near identical issue and fixed it by replacing the I/O board. I'm not familiar with the location of this. Anyone know if this could help or is it a bunch of hokum?
由 David Jonas 完成的
Also, how difficult is it to change out the LVDS cable? I'm under the impression it requires a breakdown of the display assembly, yes?
由 David Jonas 完成的
Yes it does. Most people replace the entire display assembly, then sell the good LCD to offset the cost.
由 ABCellars 完成的
My concern is that it's not the LVDS or the screen, but something else. Are there any multimeter tests I can do to help pinpoint the issues? I have a schematic of the board, but it doesn't say anything about what voltages should be at what points. I'd like to get into this a little less blind, if you know what I mean.
由 David Jonas 完成的