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[SOLVED]820-3330 Brain dead... or zombie at least

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PJs

New member
820-3330 from A1286 2012

There is no picture (even on external screen) and no chime, but CPU and GPU warms up. It beeps without RAM, but that's the only sign of life. Will not start in SMC bypass mode, or after SMC reset - I've never seen it running. I tried to flash the BIOS chip with known good one (with clean ME) for 820-3330, but nothing changed (so I flashed back the old one). There were no signs of spills, oxidation or previous repairs. It looks to me like dead CPU? I've got one CPU for 820-3330 on stock, so I can change it, but I'm not sure if it's really dead when it still beeps without RAM... Also why would it die? The chip itself looks OK, like everything else on the motherboard.


PPVCORE_S0_CPU 1.11V
PPVCORE_GPU 0.90V
PPVCORE_S0_AXG 0V

PP3V42_G3H
PPBUS_G3H 12.53V
PPVRTC_G3H 3.33V

PP5V_S5 5.05V
PP5V_S3 5.05V
PP5V_S0 5.04V
PP3V3_S5 3.33V
PP3V3_S3 3.33V
PP3V3_S0 3.33V
PP1V5_S3 1.50V
PP1V2_S0 1.20V
PP1V05_S0 1.03V
PP0V75_S0_DDRVTT 0.74V

LCD_PWR_EN 0.00V
DP_MUX_EN 1.00V
CPU_PWRGD 1.02V
SMC_RESET_L 3.10V
ALL_SYS_PWRGD 3.29V
PM_SLP_S4_L 3.33V
SMC_LID 3.09V

SMC_CLK32K present
SYSCLK_CLK32K_RTC present

Thank you
 
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dukefawks

Administrator
Beeping without RAM means it is at least sort of alive. Is a USB mouse lighting up? PRAM reset with external keyboard done with everything else disconnected?
 
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PJs

New member
No, USB mouse is not lighting up, I tried both USB ports and 5V is there, but no light.
 
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dukefawks

Administrator
Beeping with no RAM when using another BIOS too? Tried RAM in just 1 slot at a time?
Any other history as to how this happened?
 
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PJs

New member
Sorry, I did not remember history of this board when I wrote the first post. It came to me about a year ago with no CPU_VCORE, because CPUIMVP_UGATE was shorted through U7400. After changing U7400 the CPU_VCORE came back, but that's all.

It beeps even with different BIOS, I tried one downloaded BIOS for 820-3330 and one from a known working 820-3330 board - still the same. Without RAM it's just one long beep that repeats after a few seconds.

I tried all possible configurations of RAM and about 4 different tested working pairs with different frequencies (12800, 10600, L, non-L...), but it's always the same - with any RAM in any slot it's quiet, without RAM it beeps.
 
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PJs

New member
Yes, you are right, I changed the CPU and I did not fully test it yet, but it boots now :) So this one is solved, thanks
 
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