Recent content by guzq

  1. guzq

    A1398 820-00426 no eDP missing LCD_BKLT_EN

    Yes. That's why i'm suspicious with U9600 that generate LCD_BKLT_EN, should i reflow it first ??? Or just replace it ??
  2. guzq

    A1398 820-00426 no eDP missing LCD_BKLT_EN

    R7757 : 0ohm (BKLT_SDA) = 4.789v R7758 : 0ohm (BKLT_SCL) = 4.790v Replaced U/Q/D7701 issue still persist. D7701, pin1 = 0v / pin2 = 0v LCD_BKLT_EN = 0v
  3. guzq

    A1398 820-00426 no eDP missing LCD_BKLT_EN

    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...
  4. guzq

    A1398 820-00426 no eDP missing LCD_BKLT_EN

    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)...
  5. guzq

    A1502 820-3476, water damage, green light, PP3V3_S0 = 2v

    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 ?
  6. guzq

    A1502 820-4924 with weird graphics / display issues

    Replacing LCD fix the issue. Mr. Admin can mark this as solved. Thanks
  7. guzq

    A1502 820-4924 with weird graphics / display issues

    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...
  8. guzq

    A1502 820-3476, water damage, green light, PP3V3_S0 = 2v

    Yes, nothing happen. Fan still not spinning. Yes, except for L7310 (12.57v) and L7560 (3.3v) other coils just 0v (not pulsing)
  9. guzq

    A1502 820-3476, water damage, green light, PP3V3_S0 = 2v

    Cleaning area around CPU/PCH, now PM_SLP_S5_L pulsing from 2.472v to 0v for less than a second. PCH issue ???
  10. guzq

    A1502 820-3476, water damage, green light, PP3V3_S0 = 2v

    Yes, drop pulse at PM_PWRBTN_L : 3.42v to 0.349v How do i try this ?! No pulse for PM_SLP_Sx_L signals, still 0v
  11. guzq

    A1502 820-3476, water damage, green light, PP3V3_S0 = 2v

    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...
  12. guzq

    820 2936-B no green light, PPBUS_G3H 12.29v

    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...
  13. guzq

    820 2936-B no green light, PPBUS_G3H 12.29v

    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
  14. guzq

    820 2936-B no green light, PPBUS_G3H 12.29v

    U6900 replaced, issues still persist...:(
  15. guzq

    820 2936-B no green light, PPBUS_G3H 12.29v

    R6929 value 2K, with 2.894v pin1 and 3.467v pin2
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