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Sorry. Q5310 DIODE MODE TO GROUND: 1: SHORT (GND) 2: 0.500 V 3: OL 4: SHORT ---------------> IN OHM MODE this is 1.7 Ohm 5: OL 6: OL

Q5310 removed Short on Pad 4 R5313: PIN 1: OL PIN 3: OL As above: R5311 PIN 1: OL as trace was cut to pin 4 Q5310

Q5310 OHM MODE TO GROUND: 1: 0.2 OHM (GND) 2: 500 kO 3: 28 kO 4: 2 ohm 5: OL 6: OL Removed Q5030 and checked, same readings.

OK Interrupted trace to R6990 PIN 1 Short before break, no short after break Interrupted trace from R5311 PIN 1 to PIN 4 Q5310 Now no short at PIN 1 Short at PIN 4 Short somewhere in DC sense in circuit? Q5310 PIN 2 is also short to ground Will continue to test

And I will may need more than 1 break in the trace potentially to ?jump? the short ?

Follow PPDCIN_G3H trace and cutt it off in few points. By "cut it off" do you mean actually disrupt the trace by breaking the physical copper trace on the board ?

Can I use a BIOS chip from a donor board if needed?

Here is my logic: As you said, I have to cut off the PPDCIN_G3H at various points, I chose R7010 Remove R7010 and check if short remains on PIN 1 or PIN 2? If R7010 is removed AND PIN 2 Diode mode to ground is SHORT then the short is somewhere in the line after that resistor I know my...

Q7080 removed Still short to ground tested at R7085 PIN 1 When F6905 removed PIN 1: OL PIN 2: SHORT So short is after F6905 (not in dc in board or J6900) and Not in Q7080 or in reverse current protection part of circuit? Remove R7010 and check if short remains on PIN 1 or PIN 2?

I don't believe USB ports are working. No sustained significant current draw on any of them with connected devices CPUVCORE Measured at R7510 PIN 2: 1.117 V PPVCORE_S0_REG

you think the short is in the board itself? i.e. not fixable

Diode mode to ground L7030: no short 1: 0.449V 2: 0.449V 3: OL D6990 1: 0.445 V 2: SHORT 3: 0.306V D7005 1:short 2:short 3: 0.242V R7085 1: Short 2:OL C7085 1: Short 2:OL R7010 1: Short R7011 1:.535V R7020 1: 0.645V 2:0./645 V Q7080 5: SHORT Q7030 1,2,3: 0.448V 4: 0.913 V 5: 0.655 V...

OK. Charger disconnected C6905 1: Short 2: Short (GND) F6905 (C6905 also off) 1: OL 2: Short R6990 PIN 1: short PIN 2: 0.56 V

DCIN Board is good Charger disconnected for measurements on diode mode Resistance to ground checks C6905 1: 1.6 O 2: .5 O (GND) F6905 1: 1.5 O 2: .1.5 O Q5310 4: 1.5 O R5311 R: 100K PIN 1: 1.5 O PIN 2: 99.8 kO R7085: 1: 1.5 O 2: 393 kO D7005 1: 1.5 O 2: 1.5 O I did note a hole in the...

PP18V5_DCIN_FUSE measured at PAD 1 F6905 is 0V Diode mode F6905: 0V on both pads (shorted) R6990: shorted on both sides R6990: 47 Ohms ? Short somewhere on the PPDCIN_G3H rail I remember the warning not to inject voltage ever into anything that supplies PPBUS_G3H unless high side mosfets are...

L7510: 1.12 V L7520: 1.12 V USB power present.

What role does USB have? Are you asking about L7510/20 because they are CPU power rails?

For what its worth.. The keyboard backlight does not come on either. I will check L7510/L7520

I cannot see an image on the screen (used a flashlight behind apple logo) No backlight I watched Louis' videos on this and started checking the following: LCD_BKLT_EN: 0V with display connected Diode mode reading on LCD_BKLT_EN: 0.60V LCDBKLT_EN: 12 V LCD_BKLT_EN: 0 V F9700 is good Q9706 4...

Good news. Changed R/C7025.board now turns on!!..I get green light on magfsafe and fan spin Stable PPBUS_G3H LCD backlight not coming on.