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Try with working LCD assembly with same model same year, same issue...no backlight no image
With LCD attached and LogicBoard powered i do get at J8300
pin 5 (PP3V3_S0_EDP_SW) = 3.3v
pin 8 (LCD_BKLT_PWM_R) = 2.575v
pin 9 (LCD_HPD_CONN) = 3.3v
R8300 reads as 0ohm as per schematic.
L8300 = 5v at...
Hey Guys,
Working on 820-00426 chime, fan spin but no display. Plugging HDMI or DP to external monitor screen works fine.
Sometimes at random time image appears on screen just for seconds then disappear.
Board pretty clean, no visual liquid damage.
J8300 pin 1 = 0v (PPVOUT_S0_LCDBKLT)...
Yes, due to really bad water damage and corrosion it highly PCH issue.
I'll skip this and working another board right now.
Thanks for your help 2informaticos ?
Hey Guys,
Working on 820-4924 with weird graphics / display issues. Graphics working well until login screen, after put password and login to desktop screen suddenly goes mosaic.
Plugging HDMI or DP to external monitor screen works normally and also recognizes the internal screen, when...
Hey Guys,
Working on 820-3476 with severe water damage and corrosion. Replaced all bad components, using original Apple MagSafe 60w green light but no fan spin.
Here my measures:
PPBUS_G3H : 12.57v
PP3V42_G3H : 3.42v
PPVRTC_G3H : 3.3v
SMC_ADAPTER_EN : 3.398v
PP3V3_SUS : 3.3v
PP3V3_S5 : 3.3v...
Yes, i have it...steady 3.4v
U5010 measures:
pin1: 3.470v
pin4: 2.829v
pin5: 3.472v
pin6: 3.472v
pin7: 3.467v
pin8: 3.3v
I replaced SMC again, still no light, PPBUS still 12.28v
I try reball SMC to another board to test it, green light and fan spinning...
I ran out of ideas what should i...
Disconnect DCIN board and change it with other DCIN board.
U6900
pin4 2.894v
pin5 2.884v
Try compare with working board, U6900 pin4 2.923v / pin5 2.915v
Taking 0.030 Amps now and SMC_PM_G2_EN - 0.145v
Checked R4901/09/99 all value normal.
I can't check Y5010 because don't have oscilloscope but voltage at both pins 1.6v
Try replacing SMC for last time from donor, issues still persist. PPBUS still 12.29v
I'm suspicious with U1800 (MPCH), looks like i'm gonna give up for this board.
IDK what...
Try it with another DCIN board still no good result.
There's continuity from U6900 (pin5) to central pin MagSafe DCIN board.
SMC_RESET_L - 3.475v
SMC_PM_G2_EN - 0v
I'm using original apple MagSafe 60W
Yes, I'm checkin PPBUS_G3H LogicBoard alone on the desk.
Voltage & Diode mode to GND SCL/SDA lines of battery bus
R5280: 0.506 / value 2K / 3.475v (pin 2)
R5281: 0.507 / value 2K / 3.475v (pin 2)
Try using with full charge battery, BIL connector and...
Hey Guys,
Working on 820 2936-B with no green light, not recognized battery also, no visible water damage.
Already replace ISL6259 and SMC (twice) from donor board, No changes !!
This Mac draws 0.020-0.023 Amps at 16.5V, PPBUS_G3H 12.28~12.30v, what more could be the problem of 12.30v ...