I think this board has a dead/shorted cpu. I flashed the bios with a couple of different versions with same result. Measured a bunch more and found nothing concerning.
Decided to recheck with thermal camera, see pics attached. First pic shows the cpu warming and in the corner is the BQ chip and the mosfet/inductor it controls. Second pic is a closeup of the cpu and can see the hot spot is a single small point coming out the side of the die. Would you agree this is likely the issue based on everything else?
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Schematic and boardview if needed
[URL]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/3524880-asus-fx505dd-rev-2-0-boardview-proper-fz-file[/URL]https://Schematic and boardview if n...-fz-file[/URL]
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No I haven't checked it. Might be time for me to buy an oscilloscope...
- VBUS_ON output (output from EC)
- Working LED indicators (output from EC)
- Working BQ controller input mosfets
I [I]assume[/I] it to be working based on these, is this a poor assumption?No I haven't checked it. Might be time for me to buy an oscilloscope...
- VBUS_ON output (output from EC)
- Working LED indicators (output from EC)
- Working BQ controller input mosfets
I [I]assume[/I] it to be working based on these, is this a poor assumption?No I haven't checked...
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Thanks for your input, I forgot to include the measured inductor resistances I have taken:
INDUCTOR/OUTPUT = OHMS
L8100/5V0 = 16.3K ohm
L8101/3VO = 126 ohm
L8002/VDDCR_CPU_SOC = 4.9 ohm
L8001/L8002/VCORE = 3.3 ohm
L8201/0.9VO = 92.5 ohm
L8300/1.2VO = 93.2 ohm
L8700+L8701/NVVDD = 0.7 ohm
L8900/FBVDDQ = 96.5 ohm
L8800/BAT_R = 31.85K ohm
L8401/1.8VO = 30.7 ohm
And the ones as requested
3VS = 3.37Kohm (at Q9106 mosfet)
5VS = 0.95Kohm (at Q4806) (also, 12VS = 10Kohm)
SUSB#_PWR = 4.4Kohm (at D8325 pin2 -...
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ASUS FX505DT w/ FX505DD Mobo - Not Turning On
As per title, when battery is connected or jack connected: keyboard light flashes once but cannot turn laptop on. Holding power button for 10 seconds then the KB backlight will flash again. Unknown history and signs of previous repair (jump wire from CMOS battery holder positive terminal to R2453, presume broken trace under it)
Thermal camera at board, 3 points warming up (not hot, just warm). CPU, BQ chip and ethernet controller. I guess this is OK??
- Ethernet chip I guess is powered for wake on lan functionality?
- BQ chip is driving input mosfets
- CPU warming...
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ASUS FX505DD REV 2.0 Boardview (PROPER - FZ FILE)
Sick of trying to diagnose using a PDF boardview, and the other FX505 boards don't match. Found the correct one finally. Copy of the schematic too so it's all in one place....
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