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thanks. perhaps for this PSU, the feedback for the APFC ic is the VSENSE. maybe i will try do it in the future and test with heavy load...
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how do you disable the PFC circuit if the PFC controller integrate with PWM controller. will it work in 80% load?...
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Re: Hot air station - 858D opinions?
The wide size preheater will help desoldering.
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Re: Turn on 1 minutes and then turn off. Lenovo ideapad 110-14ast
PL1901 should 1.O5V, but only 0.95 V
PL402 just 15 mV
PL401 should 1.35V, but only 0.8 V
PL1003 0.9 volt(the value not stable), it seems should 0.95 volt
PL2402 1 volt (not stable and max is 1.2v), it seems should 1.2 v
what can cause the voltage drop, the voltage from the charger is stable in 20v. the other coil also stable which is 3v and 5v always. can bad capacitor make the voltage drop and not stable?
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Re: Couldnt Boot Laptop HP 14-bw087tu
Thank you so much, i will try that
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Re: Couldnt Boot Laptop HP 14-bw087tu
hi, i wanna ask, is this bios binary quad enable or not? if yes, then can i use W25Q64FVSSI[B]G[/B] which is not quad enable from the factory? cause the schematic say it W25Q64FVSSIQ , and the original bios ic is MX25L6473F M21 08G. and it says that the macronix ic is QE enabledRe: Couldnt Boot Laptop HP 14-bw087tu
hi, i wanna ask, is this bios binary quad enable or not? if yes, then can i use W25Q64FVSSI[B]G[/B] which is not quad enable from the factory? cause the schematic say it W25Q64FVSSIQ , and the original bios ic is MX25L6473F
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Re: Couldnt Boot Laptop HP 14-bw087tu
i have check the voltage of bios chip, 3.3v in pin 1, 7 and 8. the other is low, in milivolt.
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Re: Couldnt Boot Laptop HP 14-bw087tu
i have make sure the connection of the bios chip is good,but there are no sign of live in lower power rail. i think that i should use the right bios chip
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Re: Couldnt Boot Laptop HP 14-bw087tu
still not work, i have flash the main. but still same, i will check for connection the bios chip to mainboard
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Re: Couldnt Boot Laptop HP 14-bw087tu
You are right steve, the susb and susc should be 3.3 volt. That two signal will trigger suson and mainon which will turn on the lower power rail. Susb and susc come from pch which communicate with bios chip after dnbswon and rsmrst high.
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Re: Couldnt Boot Laptop HP 14-bw087tu
thanks steve, i have extract the bios
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Re: Couldnt Boot Laptop HP 14-bw087tu
i will resolder the chip tomorrow, but what should i do if have reflash the main with official bin but the problem is same, it is safe to short the S5_ON, MAINON, SUSON, and SPI_1.8V_ON? when i get corrupted bios in other laptop, the power, fan, led will turn on, but the display just blank. is true that the secondary power rail just 5volt and 3.3volt? the other not include the secondary power rail(ie 1.2 , 0,95 etc)?
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Re: Couldnt Boot Laptop HP 14-bw087tu
there no liquid spill when i work with this laptop. after changing the keyboard, there a short in the bios chip. i think that happen when laptop is bulked. i also lost the original dump of the bios so i get from the internet. i will download from the official website for the bios and try again.
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Re: Couldnt Boot Laptop HP 14-bw087tu
actually, i lost the original dump of the kbc. so i use ec from the internet which i dont know good or not, but the outcome is same, so i think the ec bin not problem anymore. can it be problem if i use old type bios chip? cause the original bios chip has been faulty.
the story of this laptop is simple, i change the keyboard, but the plastic locking for the keyboard is lost so the keyboard sink and be flat with the touchpad after reassembly. then i disassemble the laptop, give a thick paper between the keyboard hope the keyboard looks...
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Re: Couldnt Boot Laptop HP 14-bw087tu
what if i shorted S5_ON, SPI_1.8V_ON, MAINON and SUSON can it damaged the motherboard? because S5_ON is existLast edited by ndarjo21; 01-26-2022, 12:08 PM.
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Re: Couldnt Boot Laptop HP 14-bw087tu
I chechk the rsmrst pin and dnbswon in kbc, it reads 3.3 volt. But when i check SUSB and SUSC, it reads 0 volt, it is normal? Or should i use oscilloscope to check the signal is exist or not. Cause i dont have oscilloscope. But i thought that the SUSB and SUSC exist, cause there are 3 and 5 voltage in the coil
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Re: Couldnt Boot Laptop HP 14-bw087tu
but if the kbc defective, why the ch341a programmer can read it kb902x in the software.
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Re: Couldnt Boot Laptop HP 14-bw087tu
where mainon, suson, SPI_1.8V_ON and VRON come from? it is from internal of kbc right? enable just from +3VPCU_EC and +3VPCU_KBC? if thats right, can it be the kbc is defective?Last edited by ndarjo21; 01-26-2022, 12:08 AM.
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Re: Couldnt Boot Laptop HP 14-bw087tu
resistance
PL44 R22 17 OHM
PL46 R22 8.48 OHM
PL15 1R0 40.7 OHM
PL11 1R0 0.926k OHM
it is short to ground or normal?Last edited by ndarjo21; 01-25-2022, 11:21 PM.
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