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11-02-2021, 01:03 PM
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#1 |
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Senior Member
Join Date: May 2018
City & State: martinez
My Country: Argentina
I'm a: Knowledge Seeker
Posts: 184
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Macbook A1466 820 3437 no chime CPU hot
Hello
Just want to diagnose bad cpu and trash this away, but hope will not No water damage, no signs of corrosion, magsafe green then amber (no battery attached though), fan spin fast, and CPU gets HOT!! USB is 5vol present... U1950 is ok on all volts involved... any clues, thanks in advance!! |
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11-02-2021, 07:51 PM
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#2 |
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Senior Member
Join Date: May 2018
City & State: martinez
My Country: Argentina
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Re: Macbook A1466 820 3437 no chime CPU hot
vcore is present both, 1,72v
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11-04-2021, 11:38 AM
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#3 |
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Super Moderator
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Posts: 3,618
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Re: Macbook A1466 820 3437 no chime CPU hot
History, USB activity, SPI ROM flashed, PLT_RESET_L present?
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OpenBoardView — https://github.com/OpenBoardView/OpenBoardView |
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11-08-2021, 02:12 PM
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#4 |
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Senior Member
Join Date: May 2018
City & State: martinez
My Country: Argentina
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Re: Macbook A1466 820 3437 no chime CPU hot
PLT_RESET_L is present
no water damage SPI ROM not reflashed yet but i wanted to make sure CPU is not toasted USB is 5v present, CPU Hot!, untouchable after 2 mins on, (with heatsink) |
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11-08-2021, 11:04 PM
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#5 |
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Member
Join Date: Mar 2020
City & State: auckland
My Country: New Zealand
I'm a: Knowledge Seeker
Posts: 39
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Re: Macbook A1466 820 3437 no chime CPU hot
check u1900/1950
check spi termination resistors verify 3.3v on bios verify 33khz on u1900 |
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11-08-2021, 11:07 PM
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#6 |
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Member
Join Date: Mar 2020
City & State: auckland
My Country: New Zealand
I'm a: Knowledge Seeker
Posts: 39
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Re: Macbook A1466 820 3437 no chime CPU hot
R6110
r6111 r6112 r6113 r6118 r6119 r6114 r6115 r6116 r6117 r6120 r6121 r6122 r6123 r6130 r6131 r6133 r6132 r6128 r6127 r6126 r6125 |
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11-09-2021, 06:45 AM
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#7 |
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Senior Member
Join Date: May 2018
City & State: martinez
My Country: Argentina
I'm a: Knowledge Seeker
Posts: 184
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Re: Macbook A1466 820 3437 no chime CPU hot
thanks paulyboy i will return this a1466 with no solution i think,
An identical 820 3437 board shows 69.7ohm in the CPU coils (both) and this one at identical conditions shows 129ohms both... bad i think  .and U1950 is ok on all volts involved...verified 3.3v on bios... although could not test: spi termination resistors 33khz on u1900 because im about to return and is all packed, i think would mark this as a bad luck one |
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