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820-00165 No SLP

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  • #16
    Look very closely at U1950, pin 8 is the main suspect.

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    • #17
      Pin 8 has 3.42V. Pins 1 and 2 have 0.06V. All other pins are measuring 0V. U1950 and the area around it looks good. Doesn't look like it got hit by anything.

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      • #18
        Pin 1 and 2 should get a pulse on there. Best to check on pin 7, it should get a pulse just like you measured elsewhere.

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        • #19
          Pin 7 and 1 get a pulse that got up to about 1V at times - usually around 0.5V. Pin 2 got up to almost 3V some of the time.

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          • #20
            My suspect of SPI ROM data line is still the best guess. Remove ROM and measure all pins on diode mode.

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            • #21
              Okay, here are those measurements:

              1. .584
              2. .497
              3. .565
              4. 0
              5. .526
              6. .526
              7. .575
              8 .413

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              • #22
                If this is with chip removed that all seems fine. I am out of ideas on this one. Maybe corrosion under SMC or CPU?

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                • #23
                  Yes, that was with the chip off. Thanks, I'll keep digging. Could this just be a bad ROM chip or bad programming? And do you know if the fan would spin up without an SPI ROM chip on it?

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                  • #24
                    Without ROM it will power cycle on/off. I doubt the ROM will be bad <1%. Corrosion somewhere......

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                    • #25
                      Ok, got it, thanks. I'll work with that and see what I can find.

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                      • #26
                        Ok, so I had decided to let this one go, but then when I was using it as a diode-measurement reference for another 00165 board I noticed that U1950 was mangled and had some bad diode measurements. I replaced it and now my 3V42 line is at about 7V. Any thoughts about this? The diode measurements on U1950 all match a good board now.
                        Last edited by bjf; 09-19-2016, 02:50 PM.

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                        • #27
                          U1950 cannot affect 3V42. No idea what is going on.

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                          • #28
                            It had no 3V42 problem before I switched that. I replaced U7090 and it's still at 7V. I guess I'll give up on this again. No time for extended battles.

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                            • #29
                              The original board in this thread had 3V42 or it would have been totally dead. No idea what board this is then....

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                              • #30
                                It did have 3V42. It's the same board. It was fine until I switched out U1950. Something changed in the 3V42 line when I did that. Either way, moving on.

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