I resurrected an HP 8570w with a corrupted BIOS just a few days ago which had failed to come out of standby.
Device came on, no boot logo, fan ramping up, no sceen output, 5 blinks on caps lock and amber lights on wifi and volume button.
All voltages checked okay, Bios recovery did not work, so I desoldered the chip and flashed a known good one with a programmer. UEFI BIOSes are weird sometimes,
especially HP... :-)
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Never owned one myself, but Amilo Xa 3530 was notorious for for premature gpu death back in the days.
If you offered me to bet, my money would be on the graphics chip.
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Hi,
check here, maybe this gives you a lead:
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/94292-probook-640-g1-turns-on-when-adapter-connected[/url]
Maybe you have a similar case with a defective temperature signal mosfet on the smbus lines to PCH...https://Hi,<br /> <br /> check here,...onnected[/url]
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Re: HP 840 G5 Shorted Audio IC
Excuse my weak eyesight, but are you sure about these two?
They look bridged,too....
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Re: Question about AMD C50 replacement
Should work, no reason not to try...
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Re: Hp omen 15 nvidia gpu problem?
I'd suggest downclocking vram with msi afterburner or a similar tool to check
whether it is stable on let's say half clock rate. If it is, then slowly feel your way up to where it becomes unstable again. Failing/semi-defective vram is very often no longer capable of doing full clocks, but runs okay on reduced speed. Then you could flash the stable clocks to vbios.
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Re: HP Pavilion 15-cs1042ng - unknown 3.3/5.0V LDO
Tbh, there's not much else coming up aside from this one CPU phase. All other coils
around the GPU, the CPU and the RAM are without any voltage.
The last thing I could feasibly try now is probably reflash the Bios with a version found in this forum.
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Re: HP Pavilion 15-cs1042ng - unknown 3.3/5.0V LDO
Quite a coincidence, the whole thing went remarkably like this one here:
[url]https://youtu.be/6lGRpNXuK3I?t=1918[/url]Re: HP Pavilion 15-cs1042ng - unknow...I?t=1918[/url]
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Re: HP Pavilion 15-cs1042ng - unknown 3.3/5.0V LDO
I just can't believe it. I injected some more, this time 2V at 0.4A current draw and the short cleared itself
You literally could see it fizzle out on the bench power supply, slowly going down.
I now have the white light on the charging port
Weird case. Will reassemble the thing tomorrow and give an update.
Edit: battery is also charging. Hopefully no further damageLast edited by loopster; 03-12-2023, 05:04 PM.
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Re: HP Pavilion 15-cs1042ng - unknown 3.3/5.0V LDO
Zilch on the left pad, 0.36A on the right. Resistance to ground on the left in the Megohms,
on the right I get nonsensical readings depending on the measurement range I choose. Took two different multimeters. From 60Ohms up to 5k? I am currently recharging the batteries for both to see whether they read bullshit due to low charge...
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Re: HP Pavilion 15-cs1042ng - unknown 3.3/5.0V LDO
Thanks for your reply. Resistance is around 960 Ohm on both sides of the resistor.
There is no discernable difference.
Edit: on further measurements, it's a teeny bit higher on the left side, maybe around 2 to 3 Ohms.Last edited by loopster; 03-12-2023, 09:42 AM.
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Re: HP Pavilion 15-cs1042ng - unknown 3.3/5.0V LDO
I also borrowed a linear power supply from work, and now injected 1V with limited current on the 2.2Ohms resistor. Current draw is 0.35A, which is quite (in fact very) high I think. Since there is supposed to be 3.3 there, is there any objection to injecting 3.3V with say 1A (or more, as the case may be) to see whats causing the current, i.e. gets warm/hot?...
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Re: HP Pavilion 15-cs1042ng - unknown 3.3/5.0V LDO
Since, as we have already established, I don't have the original power adapter, so far I've checked with a 90W universal (blue tip connector) +
with 230W, 120W and 65W original HP chargers (from Elitebooks and Probook) via a 7.4mm to 4.5mm blue tip adapter.
The ADP_SIGNAL voltage is ranging from 19.4 to 18.9V with these, and according to piernov, at a minimum the 230W or 120W adapter should be sufficient
[url]https://www.badcaps.net/forum/showthread.php?t=95945[/url]
[I]HP use a resistor between...
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Re: HP Pavilion 15-cs1042ng - unknown 3.3/5.0V LDO
Are you referring to this thread to check whether the EC is pulling the voltage down
to 1V on the 2.2Ohm resistor? Should be 3V or 3.3, right?
[url]https://www.badcaps.net/forum/showthread.php?t=77778[/url]Re: HP Pavilion 15-cs1042ng - unknow...?t=77778[/url]
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Re: HP Pavilion 15-cs1042ng - unknown 3.3/5.0V LDO
Yeah, you are right, of course, Sephir0th. It measures fine out of circuit.
(I am loosely following your vids on YT btw. Good stuff, keep up the great content).
I'm just starting out with this, and was dubious myself.
The charger is indeed not original, but it has the center sense pin with 19.3 volts on it, and puts out 19.8.
I have to wait for a suitable adapter for this size of barrel connector to hook up
an original HP adpter to the board. Altough, I don't think the charger is causing any...
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Re: HP Pavilion 15-cs1042ng - unknown 3.3/5.0V LDO
This diode feeding into ITE8987 marked yellow measures funny.
While all other diodes of the same type on this board measure 269 and OL in diode mode, this one measures 269 and 1350.
It's marked KN 500. Could this be the cause of the fault?
Can't find any datasheet on that type. Anyone knows whait it is, is it a Schottky diode? Could I replace it with a different type?...
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