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Re: MBA A1932 820-01521-A no Post after few seconds it restarts
ALL_SYSPWRGD: 1.8V it should be higher volt.Comment
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Re: MBA A1932 820-01521-A no Post after few seconds it restarts
Confirm with the schematics but believe that the pull-up resistor is to 1v8 so ALL_SYSPWRGD is ok at 1v8.
What is the exact voltage at PPBUS_G3H ?Comment
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Re: MBA A1932 820-01521-A no Post after few seconds it restarts
Check each of the following rails:
PP1v8_S3: Normal voltage is ~1.8v. Produced from U7800. (Powers system RAM.)
PP1v2_S3: Normal voltage is ~1.2v. Produced from U8100/Q8100. (Powers system RAM.)
PP1v_S3: Normal voltage is ~1.0v. Produced from U7800. (Powers some CPU functions.)Comment
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Re: MBA A1932 820-01521-A no Post after few seconds it restarts
The PCH will then de-assert (pull low) PM_SLP_S3_L and PM_SLP_S0_L momentarily to enable the final stage in the power up sequence.
Confirm the following voltages:
PP1v2_S0SW: Normal voltage is ~1.2v. Produced from U8240.
PP1v_S0SW: Normal voltage is ~1.0v. Produced from U7800.
PPVCCIO_S0_CPU: Normal voltage is ~0.95v. Produced from U8110/Q8102.
PPVCCSA_S0_CPU: Normal voltage is ~1.5v. Produced from U7100/U7290/Q7291.
PPVCORE_S0_CPU: Normal voltage is ~ 0.75v. Produced from U7100/U7210/U7230.
PPVCCGT_S0_CPU: Normal voltage is ~ 0.75v. Produced from U7100/U7410/U7430.Comment
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Re: MBA A1932 820-01521-A no Post after few seconds it restarts
PP1v2_S0SW: 1.198V
PP1v_S0SW: 1.007V
PPVCCIO_S0_CPU: 0.957V at R8102, there is no PPVCCIO_S0_CPU at U8110/Q8102
PPVCCSA_S0_CPU: 1.109V from R7290, 1.144V from Q7291 CPUSA_SW_LL
PPVCORE_S0_CPU: 0.839V from R7230, R7210
PPVCCGT_S0_CPU: 0V from R7410, R7430 actually L7410, L7430 have 0V as wellComment
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Re: MBA A1932 820-01521-A no Post after few seconds it restarts
Is your trackpad / keyboard connected during these tests ?
Remove them if they are and test again.
You can use the ON/OFF button in the bottom right of the PCB to turn the logic board on/off (SWE010; PMU_ONOFF_L)Attached FilesComment
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Re: MBA A1932 820-01521-A no Post after few seconds it restarts
I want to take the time a THANK YOU for the effort and time your are spending helping me,
I really appreciate it!Comment
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Re: MBA A1932 820-01521-A no Post after few seconds it restarts
Reflash the T2 Rom (U2890; 3v3 device) using the dump from here:
https://www.badcaps.net/forum/showth...ight=rom+dumps
* backup your original flash before erasing the deviceAttached FilesComment
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Re: MBA A1932 820-01521-A no Post after few seconds it restarts
U2890 is USB-C controller ROM, not T2.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: MBA A1932 820-01521-A no Post after few seconds it restarts
My bad - all in the basket of Tx propreitary crapware. The TBT rom was only to confirm the image is stable to maintain the 20V power delivery contracts.U2890 is USB-C controller ROM, not T2.
Is the display attached ? Can you test without the display to see if the results are different ?
Can you confirm the voltages for the SOC ROM ?
Check the Vcc; MISO; MOSI pins. Suspecting some I2C / SMBUS / SPI widget is timing out and the boot process restarts / loops.Attached FilesComment
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Lenovo Ideapad 100-15ibd
Laptop turns on and restarts every 7 seconds or so.
Power led and Webcam led turn on and goes off repeatedly.
Pressing the power button does absolutely nothing.
Same thing happens whether the bios battery is connected or not.
I tried resetting the bios, press power button to drain power etc.,
but no change same thing. I tried numerous ram modules but same result.
Using a desktop power supply I can see the amps going to zero and rebuilding,
same thing with multimeter. Doesn't matter if I plug in adapter or main battery,... -
Hello Community,
i'm troubleshooting this one since days and actually i'm really lost because i believe i'm Missing the required experience for an issue Like this...
It is a Dell XPS 15 9560, i7-7700HQ, GTX1050 Board Number LA-E331P Rev 1.0, Most similar to LA-C361P so i use this Schematics.
Issue: Starts and shuts Off after a few Seconds. Basic Troubleshooting (Adapter,RAM,BIOS/EC Flash from alisaler) of course already done, which didn't Changed anything.
I have another working Board with i5-7300HQ and GTX1050, with It's Help i can compare... -
Hi all,
I have a Lenovo Legion 5 with a Ryzen 7 series CPU and RTX 3070 GPU. My issue is that it turns on and all seems fine except after a few seconds the fans spin up high and the laptop turns off after 34 seconds.
I can get into bios and can even boot and login to Windows however after 34 seconds no matter if Im at the bios screen or booted into Windows it will just turn off.
I have managed to run HWmonitor and the temperatures of the CPU and GPU are fine, I can also touch the heatsync which is warm but not hot.
I have tried a few new bios but exactly... -
hi all,
first of all: i'm a (motivated) newbie, so please forgive me any stupid question i may or may not ask
i'm currently repairing a projector: Epson EB-U42 that doesn't start (no lights, nothing).
what i've found so far:
- the PSU does its job and supplies 12V to the mainboard via the connector.
- shortly thereafter, there is a mosfet (TS420-600B) where i can test 12V on the one side (in the data sheet this side is called Anode), Gate 0V, Kathode shorted to ground
- not far away, there's the first cap with a resistance of 0.7 ohms.... -
Hi!
Asus B85M-GAMER absolute no hdmi output (not at start, not at Windows), and random restarts. Everything work, except hdmi and random restarts after 0.1-3 min. Restarts even in bios. On VGA Windows boots up fast, games and apps starts ok. Mem, psu, cpu changed, no luck. I need shematic, because i think the restarts caused by the hdmi failure.
Comment