Recent content by roy.ruan

  1. R

    Any luck with the 820-3330 video issues?

    not the MUX, tried replacing it previously, exact same issue after replacement . this model is hell of a headache, I tried everything but no luck
  2. R

    liquid spilled 820-3115 1/4 fan spin

    no CPU Vcore plusing , check all other voltages jump around but CPU vcore is nothing , 0 all the time. check R7402/03 are good resistance and traces are good
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    liquid spilled 820-3115 1/4 fan spin

    having a 820-3115 board,minor spilled around u2600 area and near area. so replaced u2600 and ultrasonic cleaned the board. everything looks cool , no corrosion. but board still the same condition when it was sent in. 1/4 fan spin, spin off, then spin on then off , repeat again and again. check...
  4. R

    820-2915 strange problem, only works with fake charger?

    yes, ppbus actually happened to be normal for a like a second then falls . same as pp3v42
  5. R

    820-2915 strange problem, only works with fake charger?

    yes, ppbus actually happened to be normal for a like a second then falls . same as pp3v42
  6. R

    820-2915 strange problem, only works with fake charger?

    and it works fine with charged battery
  7. R

    820-2915 strange problem, only works with fake charger?

    my bad,in fact pp3v42 doesn't present most of the time when using genuine charger. even on F6905 there is only 2v , so saying even the charger is not outputting correct voltage? detected a short?
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    820-2915 strange problem, only works with fake charger?

    just replaced q7080 and no change. R7005 trace and resistance checked all good, and again, it works fine with those fake chargers somehow
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    820-3435 not charging "X" battery detection

    yes tried with a known good battery been using for repairs. ppbus around 9v. the SMBUS_SMC_5_G3_SDA jumping around 0.2-3v with or without battery. makes no difference
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    820-2915 strange problem, only works with fake charger?

    having a strange 820-2915 board here. previously it was fixed for the GPU replacement. and worked and tested. 2 weeks later customer returned and said no power at all. so we checked, the machine can power on with DC power supplier or fake knock off charger. but not apple genuine charger...
  11. R

    820-3435 not charging "X" battery detection

    machine got liquid spilled. no power , big area spilled and fixed. power on then got the typical battery not being detected with "X" want to mention first, q7155 was shorted and bad, replaced. (previously board can't power on when battery inserted) . ok , so SMBUS_SMC_5_G3_SCL=3.3v stable...
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    820-2915 ,battery "X" not being detected, not the simple cases usually encountered

    r5280 and r5281 were checked. don't see anything on the connector. but even I removed the SMC, the diode mode to ground resistance is still not right . still 600+ on SMBUS_SMC_BSA_SDA normal should be 400+
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    820-2915 ,battery "X" not being detected, not the simple cases usually encountered

    820-2915 ,battery "X" not being detected, not the simple cases usually encountered Hi guys,having a strange 820-2915 board giving me headache. problem is battery not being detected, thought should be a piece of cake as fixed a lot previously already. usually only 3 things , which all had been...
  14. R

    2010 A1286 nVidia GPUs

    don't waste your time, this pattern is game over. I tried MUX, VRAM, GPU. you will still get the same result, I will vote for the problem on PCB
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