MacBook Pro Schematic Questions
A few questions about Apple/MacBook Pro schematics:
- Many of the resistors are marked TF. Are those thick film or thin film resistors? Does it matter?
- Likewise, there are some resistors marked MF or MF-LF. I am assuming MF = Metal Film. Correct me if I am wrong. What does the MF-LF stand for? Looking on Mouser, etc. I do not see any resistors of that type.
- There are several capacitors marked with package size 402-2. I know what a 0402 package is. And I know this is still indicating an 0402 package. But what is the “-2” part of the package? I am assuming a specified height, but once again cannot find an actual package specified as such.
- At the top of the schematic page for the back light circuit I see the following in the page notes: “BKLT:ENG - Stuffs 10.2 ohm series R for engineering builds. BKLT:PROD - Stuffs 0 ohm series R for production.” Several resistors on the schematic are marked as “BKLT:ENG “ and 10.2 ohm resistance. However, since this is an actual production model, would I replace those with 0 ohm resistors if need be or stick strictly to the schematic designations?
Probably have more questions to come, but those are the most important at the moment. Any help would be greatly appreciated.
UPDATE: I have figured our most of these for the most part. The ones that still beg an answer is #3 and especially #4. Was hoping for an answer by now because I am ready to order parts.