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Customer said MacBook would not turn on. I verified this by connecting charger and Mac was only accepting 5.1V at 0.24A on three of the four ports. The last port was doing nothing at all. I removed board and PP3V3_G3H was only 2.6V and UB300 had a small hole through it. I removed and replaced...

I have an 820-00239-09 Board here. PP3V3_G3H is at 2.60V, no short to ground. I have replaced one of the CD3215 chips (it had a hole in it) PPDCIN_G3H is 5.1V. Charger is stuck at 5.1V, 0.24A PPVIN_G3H_P3V3G3H is 4.602V I have also replaced diode D6902 with no change Should I be replacing...

C7630 PIN1 = 500ma in bursts C7630 PIN2 = 6-7V in bursts R7631 = 1.2V in bursts R7630 = 6-7V in bursts

I decided to replace U7600. Now the charger is taking 27ma and trying to turn on (bursts of 300ma every 3 secs) Still no boot

PIN 6 - 1.80V PIN 12 - 5.10V PIN 16 - 3.30V PIN 17 - 0.0V And correction on short to ground. Its 40Ohm short to ground on L7630

Just checked voltages: L7130 = 8.61V L7520 = 5.1V L7560 = 3.3V L7430 = 1.20V L7630 = 0.367V (should be 1.05V ?) There is a .29ohm short to ground on this line. I connected power supply @ 1.05V, 1.5A and cannot find the short. Dead cpu maybe?

I have a water damaged 820-3437-B board that is not turning on. Originally there was corrosion on Q7630 causing 200ma draw on power supply. I replaced this chip along with C7622 and C7624. There is now a 70ma being drawn and no power. Green light on charger/turns to orange. I have verified...

Hello. I have a 2012 Retina MBP A1398 Board 820-3332-A that fails to power on. There is a green light on the charger (turns to amber) All voltages are present except for PP5V_S4 and PP5V_S5 on U7201. P3V3S5_EN is Present No PM_SLP_S5L No SMC_S4_WAKESRC_EN There are no shorts to ground on any...

Short to ground on pin 1 of LVDS cable. - Disassembled Display and removed LVDS cable - Observed corrosion in and around the connector and pin 1 on the cable end - Replaced LVDS connector on display - Replaced cable Fixed

OK. I just measured pin one of LVDS connector and its shorted to ground. Looks like I'm taking apart this display! Hopefully its just a cable

I have a backlight issue on an A1425 820-3462 board. backlight Fuse was blown. Replaced fuse, stayed good after power on, no short to ground on PPBUS_G3H line PPVOUT_S0_LCDBKLT is 0.44V. PPBUS_SW_LCDBKLT_FUSED is 12.57V LCDBKLT_EN_L is 12.6V PPBUS_SW_LCDBKLT_PWR is (minus) -0.153V...