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  1. T

    820-3787 No brain?

    I have 820-3787-A. When switched ON , there is no display , no light , but continous ram beeps. All voltages are normal . Ram voltage is also present. There are 32 rams. MEM_RESET_L voltage is 1.34v.Now what to test? And how to confirm which ram is bad.
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    820-3115 SMC_PM_G2_EN 0V

    Just now i am working on 820-3115. Sus o/p signal from pch is missing. S5_PWRGD is getting generated but PM_RSMRST_L is missing. Tracing the signal i find PM_SLP_SUS_L is missing. What should i check in PCH. ?
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    a-1502 led functioning

    i am doing my work but brother i am not happy with what i am doing. I have outline knowledge about the signals in apple motherboard. Pls help me if you have complete signals processing from first to last signals. way back in my institute my teacher thought us about television circuit. I was...
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    a-1502 led functioning

    i have given you exact reading of A 1502. Just now i have kept it aside. I will again take fresh complete reading of j8300 (all voltages) upto cpu. and let you know. Just now i am working on 820-3115. Sus o/p signal from pch is missing. S5_PWRGD is getting generated but PM_RSMRST_L is...
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    a-1502 led functioning

    not solved a 1502
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    a-1502 led functioning

    pls help me regarding the step by step signal processing in this motherboard
  7. T

    a-1502 led functioning

    In my 820-3115 , S5_PWRGD is getting generated but PM_RSMRST_L is missing. Tracing the signal i find PM_SLP_SUS_L is missing. What should i check in PCH. ?
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    a-1502 led functioning

    DP_INT_HPD --- 3v , EDP_BKLT_PWM---- 0v
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    a-1502 led functioning

    j8300 voltages pin 1 0v 3-5v 4-5v 5-3.3v 6-3.3v 7-3.3v 8-0v 9-3.3v 10-0v 28,29,30 - 5v
  10. T

    a-1502 led functioning

    EDP_PANEL_PWR_OR_PSR_EN --- 3v pin 28,29 30 - 5v
  11. T

    a-1502 led functioning

    yes dear friend , i am getting dim display. I flashed a torch light at the back of display on apple logo. i see ? mark blinking.
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    a-1502 led functioning

    DP_INT_HPD -- 3v LCD_PSR_EN --- 0v
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    a-1502 led functioning

    yes i am getting image. question mark blinking. yes i measured in diode mode . forward ie: red probe ground and black on pin 1 - 1.225 is the reading . reverse ie: black is ground and red on pin 1 - infinite. This is same even in ok board. DP_INT_HPD and LCD_PSR_EN present . I have not...
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    a-1502 led functioning

    yes i connected red probe to ground and black on pin 1 of j8300. Again i will measure. Yes it is 1226 ohms
  15. T

    a-1502 led functioning

    EDP_BKLT_PWM , EDP_BKLT_EN , EDP_PANEL_PWR , all three signals are missing from cpu out
  16. T

    a-1502 led functioning

    i connected a jumper wire from input to output - now 3.3v . no light
  17. T

    a-1502 led functioning

    u8310 vin - 3.3v on- 3.3v vout - 2.5v pin 1 with lcd connected - 1.222ohms w/o - same q7700 pin4 - 12.49v , pin3 - 12.59v 1,2.5,6 - 0v
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    a-1502 led functioning

    i flashed the bios with the one you send. I am getting dim display. Voltages onj8300 are as below 1- 0v 3- 5v, 4-5v, 5-2.54v , 6-2.53v, 7-2.53v, 8-0v , 9-2.53v, 10-2.51v , 28,29,30 - 5.16v
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    a-1502 led functioning

    need 100% ok bios for 820-4924
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