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Type: Posts; User: riverman

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  1. Re: 2011 MacBook Pro 15''/17'' GPU disable with no HW mods

    brightness can, yes, it's $20 a board though if you use dosman's programer. I guess you could jstu read the newly written mux chip and clone it, mind you
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    Re: problem with my hakko fr 801

    can't speak for the 801 but my 810B manual has this info in it, manuals should be free to download from hakko website
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    Re: 820-3208 - axg vcore missing

    PPVCORE_S0_AXG only present with display connected and board booting, and 5ohm on that rail is good, so ignore u7400 for now. check spi clock and chip like mitch says
  4. Re: 820-3299 not detecting GPU, can't find a boardview

    alright, I've got this board fired up and I'm leaning toward bad GPU.

    chimes and boots fine, everything seems to work but video on both internal and external. GPU clock workjs fine, gpu vcore and...
  5. 820-3299 not detecting GPU, can't find a boardview

    hi guys, long time no see. I've got an imac board I need to fix, but I can't seem to track down a boardview for this, just a schematic. does anyone know where I can get one?
  6. Re: troubleshooting 15" 2017 touchbar with no internal display

    do you know what the behaviour of tha tblown fuse is? ie. right now I've just jumped the LCD's power rails and now I get a momentary blip of HDP action, which for all I know could be just the board...
  7. troubleshooting 15" 2017 touchbar with no internal display

    I'm new to these usbc based macs. this one came in with liquid damage, got it up and running after reballing one of the USBC chips. everything works perfectly, but I'm not getting internal display,...
  8. how to fix a damaged button / torn cable on 2012+ imacs

    somehow managed ot tear the power cable clean off a 27" I was working on and thought I was pretty screwed. if this happens to you, just head up the back side of the casing with a heat gun until its a...
  9. Re: Macbook Pro 13" A1278 2009 820-2530-A no light on the magsafe

    yeah that doesn't sound like a bad soldered u7000 at all, if you want any reference measurements I have a known good board here that I can test for you, but my brain is racked for ideas on this one....
  10. Re: Macbook Pro 13" A1278 2009 820-2530-A no light on the magsafe

    nah dude don't bother, 7060 doesn't really matter here, there's a reason your ugate is low and that's what needs to be sorted out. my guess on u7000 not beign soldered properly is jsut based on me...
  11. Re: Macbook Pro 13" A1278 2009 820-2530-A no light on the magsafe

    [edit] a fuck I read the post wrong.

    I think amon and bmon are essentially analog signals that tell the SMC how much current the ISL is using from the AC and battery, where the higher the voltage,...
  12. Re: Macbook Pro 13" A1278 2009 820-2530-A no light on the magsafe

    haha oh man, I missed that. that's a bit shorter than I would have guessed but certainly not short enough to bring down your ppbus I don't think.

    anyhow, did oyu check all the resistors attached...
  13. Re: Macbook Pro 13" A1278 2009 820-2530-A no light on the magsafe

    diode mode with red pribe on gnd, a d black probe on ppbus_g3h
  14. Re: Macbook Pro 13" A1278 2009 820-2530-A no light on the magsafe

    hmm, if you are definitely getting 23 ohms between pin 27 and 28 and 1getting full dcin to q7020, I'd want to make sure your g3h isn't being pulled down. what's your diode mode to gnd on g3h? should...
  15. 820-4924 not seeing SSD, no liquid damage, all measures on connector perfect SOLVED

    for anyone who may google this down the road, I had an 820-4924 that wouldn't see the SSD. VDH002 error, SSD would get hot, no sign of liquid damage, and would boot off USB no problem. the issue...
  16. Re: Macbook Pro 13" A1278 2009 820-2530-A no light on the magsafe

    q7020/21 don't often fail, it's usually the two trannies that come before (7000/7001) and/or the resistors between them and the ISL and/or the current sense resistors. when voltage is fuckity there,...
  17. replacing a dead CPU with a lesser version?

    hey guys, I work in a repair shop and scrap a lot of boards with 4th gen chips that are A-OK, but lower clock speed than what we get on most macs. for example, I've got an i5 4310u that I harvest...
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    820-3476 missing smc_pm_g2_en

    board took a lot of liquid, getting stable ppbus_g3h, 3v42 is a solid 3.39, magsafe goes green then stays orange after asecond, and that's it. letting the board relax gives a proper diode mode on...
  19. Re: 820-3588-A Chime reset chime reset chime reset

    at this point your best bet would be to go over the board under a microscope and look for any burnt/damaged/browned components for a clue. likewise, check ALL S0 rails, you might have one that's a...
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    Re: Imac 21.5 Mid 2011 Memory slot Problem

    rearrange the ram, these things are notoriously finicky about mixing and matching modules, expecially the 27" ones. if the slot is in fact bad, you likely knocked off a component or two putting the...
  21. Re: 820-3588-A Chime reset chime reset chime reset

    unplug power, hold power button, plug in power, keep holding for a fw seconds, then release button. system will boot without using the SMC.

    anyhow, mosi is a data line and clk is a clock signal,...
  22. Re: 820-3588-A Chime reset chime reset chime reset

    unless you have a spare PSU, it's worth scoping it and making sure it isn't dropping during the reset; it should stay a constant 12v. I sincerely doubt there's anything wrong with the PSU though....
  23. Re: 820-3588-A Chime reset chime reset chime reset

    disconnect the power button, jump it to start and see if that still happens. I've seen a few wonky power buttons on those stupid things. (button plugs in on the PSU)
  24. Re: MacBook Pro "15 2010 - strange video problem / deactivate gpu nvram variable

    you should be able to find those caps all over 820-3115 boards, but if you can't, just shove any 330uf cap that will fit as long as it's at least 2v. my guess is that with that cap removed since it's...
  25. Re: 820-00165 brightness not adjusting smoothly

    well, this is on an 820-3115, and come to think of it, this is the *only* board I've seen this issue on (saw it happen a few times now).

    I wonder if the chips I have are just a newer revision and...
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