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  1. gcain

    HP Board chip ID.

    Thanks Duke.
  2. gcain

    HP Board chip ID.

    Brittle MB: 15256-1 I couldn't find any technical info for it.
  3. gcain

    HP Board chip ID.

    If this is the wrong section, please move the post. A shop gave me an HP board which went dead when they were replacing a broken screen. I found a 2.2Ohm resistor which was burnt out so checked in diode mode to ground and found it to be almost a dead short. When I put some current on the...
  4. gcain

    [SOLVED]820-4924 - No backlight or picture.

    Resoldered U8330 and we get picture! Mark solved please.
  5. gcain

    [SOLVED]820-4924 - No backlight or picture.

    If I press hard on U8330 I get a backlight but no picture. Will try resolder it and see.
  6. gcain

    [SOLVED]820-4924 - No backlight or picture.

    7mV. Probably a bit low.
  7. gcain

    820-3476 - Not powering on. R7105 sizzling.

    Battery isn't charging.
  8. gcain

    820-3476 - Not powering on. R7105 sizzling.

    Laptop fires up with a charged battery. Shows power connected and disconnected but not sure if it's actually charging yet. Maybe the battery is dead. Won't fire up so I can't tell what the original battery is doing.
  9. gcain

    [SOLVED]820-00165-A Liquid Damage, No Power

    Using a MagSafe 1 with an adapter? I found some of the newer boards will only power on with a genuine MagSafe2, otherwise they require the battery to get S4.
  10. gcain

    [SOLVED]820-4924 - No backlight or picture.

    J8300::30 = 5v
  11. gcain

    [SOLVED]820-3209 - Randomly reboots around the chime with no battery

    Seems there was indeed a burnt trace. I ran a jumper and all is well. Mark solved please.
  12. gcain

    [SOLVED]820-3209 - Randomly reboots around the chime with no battery

    If I connect a known good battery I can get it to go past the chime but it doesn't sense the battery correctly. When power is plugged in an no battery it keeps rebooting randomly. With battery or battery and power it will make it to unlock screen, but; When power is connected the battery...
  13. gcain

    [SOLVED]820-4924 - No backlight or picture.

    Yes, known good display. EDP_BKLT_EN in diode is 0.519V
  14. gcain

    [SOLVED]820-4924 - No backlight or picture.

    Tiny liquid spill directly on U8330 and R8310. Replaced both, but no change. Seems EDP_BLKT_EN becomes unstable once it posts.
  15. gcain

    820-3476 - Not powering on. R7105 sizzling.

    OK. Resoldered U7100 and both current sense resistors and now the resistance between 27/28 is 20.1Ohms. PPBus @ R7005 is still 4.8volts.
  16. gcain

    [SOLVED]820-3437 - No green light.

    Just did that and it fixed it. :o I have never fixed a board by doing a "reflow bro" ever before, thought it was a myth. Mark solved please. :)
  17. gcain

    820-3476 - Not powering on. R7105 sizzling.

    98.5 Ohms. I know it should be 20Ohms, did I maybe grab a damaged U7100?
  18. gcain

    [SOLVED]820-3437 - No green light.

    Now that I look really closely I can actually see residue up the one side of the SMC and going under it. :( Will keep till I get a stencil for it. Thanks Duke.
  19. gcain

    820-3476 - Not powering on. R7105 sizzling.

    Absolutely nothing. But you did tell me to measure around U7100. I'm more concerned about the missing PPBus. That would be the first thing to restore before anything else right?
  20. gcain

    820-3476 - Not powering on. R7105 sizzling.

    R7102::1 = 16.6v R7102::2 = 6.7v Could this be a faulty U7100?
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