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Got this board that had heavy corrosion damage on and around the backlight circuit. Found blow cap C8467 and also had to replace R8446 as pin 2 of the resistor along with the pad was corroded. Due to R8446 solder pads being damaged, i soldered it to C8457 and ran a line from pin 2 of the...

Have this board, no liquid damage or corrosion found. The fan spins for about 10sec then shuts off, then starts spinning again and remains spinning. The fan then ramps up slowly until it reaches max speed. Theres no USB activity, only a initial flash of the usb light when connected Cpu voltage...

Answers to questions below So fan spins only if battery is present? Yes What happened is both battery and charger are connected? Fan will spin when power button is pressed. I can also shut it down by holding on the power button and the fan stops spinning until i press the power button again...

Have this unit that isn't power up. The fan will spin and slowly ramp up until it fully ramps to max speed. This only happens with the battery. Without the battery, the board never powers up or doesn't pull any current. With battery connected, current draw is present. History on this board is it...

Before i start replacing the RAM chips, anything else to check? These are measurements i've taken so far. No corrosion or liquid damage on the board. PP0V75_S3_MEM_VREFDQ_A - 0.68 PP0V75_S3_MEM_VREFCA_A - 0.68 PP1V35_S3_MEM - 1.36 MEM_RESET_L - 1.36

o-scope only showing DC signal. On a good board, it's about 1.35v. U5000 measurement: PP1V2_S5_SMC_VDDC - 1.2v PP3V3_S5_AVREF_SMC - 3.3 PP3V3_S5_SMC - 3.4 SMC_RESET_L - 3.38 SMC_WAKE_L - 2.9 SMC_CLK32K - 32.77k

Have this board, that appears to be good, just not booting up. When i attempt to revive i get this message, "Configurator could not perform the requested action because the device is not in recovery mode." When i attempt restore, i get this message, "Can't restore device in this state - please...

what could cause PM_PWRBTN_L not to respond when SMC_ONOFF_L is triggered? I've replaced the SMC with the same result.

no clock oscillation at Y5110 just DC voltage at pin 1 @ about 1.5v.

Guess i should have checked that first. Still getting used to these T2 style system. Anyway, looks like it was stock in DFU mode. once i ran the revive action, it brought it back to life. It's now going through the install process. Thanks a lot for the assist.

so more measurements PPVDDCPU_AWAKE - 0.75 PMU_SYS_ALIVE - 1.8 PMU_VDDMAIN_EN - 0 P3V3MAIN_PGOOD - 0 (resistance measurement also shows 100ohms to ground and slowly climbing until reaching mega ohm range) PP3V3_G3H_RTC 3.28 Anything else to check.

Same result with another smc.

Diode measurement is 0.61 before power 15sec after power removed, diode measurement 0.14 and slow starts to climb as times goes on. At 3min its at .34. Here are some of the voltage readings. a bit tricky finding the test points as there are a lot of differences between the 820-01958 and 01521...

Have this board that's not power up, not sure if i've successfully isolated it but compared to the 820-01521 version, on U7650 after plugging in the power and then removing it, pin 4 (P5VG3S_EN_DLY) has a resistance of 93ohms. On a good board, performing the same test, pin 4 remains at 47k. I've...

All SPI bus resistors and traces good. No change after removing J6100

Have this board that came in with some corrosion damage and wasn't powering. Clean up the corrosion and replaced any corroded components, but still not powering up. What i get is two pulses on PP5V_S4, and even ALL_SYS_PWRGD at initial point of connecting the MagSafe. No activity on smc...

Tried good bios with same issue, and PPVCC_SO_CPU never steps down.

Anyone know of an OSx app i can use with the MiniPro ECU TL866A?

PPVCC_S0_CPU - 1.08 No usb activity or external video.

This is now fixed. I decided to reinstall OS and it fixed it.