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huzo
Senior Member
Last Activity: Today, 12:18 PM
Joined: 09-27-2014
Location: ZAGREB
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  • I have the same board, dead as a door knob, i get 20V on the Board,but no 3.3V or 5V, on the PU9 which is RT6575DGQW i have some voltages comming out of the chip, 2.4V and 4.5V,dunno what pins exactly, it was late and i did a quick measeurement, but not getting the correct outputs probably, no shorts anywehre on the board, so if i change the [B]RT6575DGQW i am good to go?[/B]I have the same board, dead as a door knob, i get 20V on the Board,but no 3.3V or 5V, on the PU9 which is RT6575DGQW i have some voltages comming out of the chip, 2.4V and 4.5V,dunno what pins exactly, it was late and i did
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  • yes,that....sorry,i am self taught and still learning ...what to look for next?
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  • So i figured... i don't get the pgd signals obviously...so i am missing a voltage?I don't know how to read the startup sequence from the image few posts above , can anyone explain? There are no shorts on the board, except low resistance (5 Ohm) on the +VCC_core,but i injected 1V, and get 200mA draw...so no short......
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  • PWR_GOOD_3 on PU5 is low...0V,so that is ok?i don't know what else to try...i tried a few dumps, no change...
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  • Sorry for lifting an old thread, but i have simmilar issues with this board, when i plug the charger, the LED on the charger goes white and at the same time 4 time amber blinks while white is glowing , also poweer button is white for that time and then it goes off...i have 3.3V and 5V, PU12 =1.8V, and 2.2V at the power button...and that's it...the board doesn't turn on,2.2V goes of when put to ground,KBC gets that signal, adapter signal is present on the KBC, what else to look for? Can anyone explain how to read the power on sequence? Signals like PWR_GOOD_3 should be low or high?...
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  • I knew no one will understand and say replace the keyboard the power button works fine,all the buttons do, it's not stuck,something else is wrong.button reacts to pressing and it turns on the laptop,turns it off normally,but tou have to have another button pressed on keyboard...i tried measuring pins on motherboard,3.3V on pin,when i press power it goes to gnd,when release it's back to 3.3v so it's not stuck...i am just curious is it a motherboard issue or a keyboard,probably keyboard,but why does it happen....and that's third or forth laptop that i came in contact with the same issue...
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  • Acer laptops and keyboards

    I noticed in manny cases the following : You press the power button and laptop starts turning on and then goes off again, but if you press any key on the keyboard and hold it, the laptop stays on and works fine! The power button works, any other button works , but one button must always be on!

    Has anyone else notice that? I was meaning to write about this topic a few times already , but never got to it, and today i got Aspire A315-42 with i5 10th gen. and it has the same issue and i got mad and now i am writing about it!

    If you hold any button on the keyboard the laptop...
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  • Sorry guys but i don't get it... if the resistors have to be in 0010 configuration does that mean that RC44, RC41 and RC46 have to be removed, and RC38 soldered?
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  • huzo
    replied to Lenovo T590 bios
    Re: Lenovo T590 bios

    i found something odd in the schematics...

    on VCC, pin 8, there is a diode ,before diode there is 3.3V,after diode 1.5V on the VCC pin, so the diode is bad, i shorted it and now i get the 3.3V on VCC, but symptoms are the same, it still doesn't work...could the chip itself be damaged?Because the erasure and blank check and programming and verify goes all ok...i got the error first time i deleted the chip something about the erasure control and registry bits....i forgot what it was, i just pressed ok......
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  • Re: LENOVO T590 not turning on

    guys i will sell the laptop for parts...i can't find what's wrong, and no one want's to help on what to do next...
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  • Re: LENOVO T590 not turning on

    So to continue from thread in bios requests...

    no shorts, all the voltages start...but i have a peculiar reading of 0.845V on the PL0909, PL0904,pl0902, but it seemes that is ok...i couldn't find the voltage needed on those coils...but there is some, and it's not shorted...


    the board isn't water damaged, the owner said it turned it off in the evening, and in the mornning it wouldn't start anymore...

    tried a few dumps from this thread [url]https://www.badcaps.net/forum/showthread.php?p=1252718#post1252718[/url]...
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  • huzo
    replied to Lenovo T590 bios
    Re: Lenovo T590 bios

    but i did download it with 1.8V adapter, i am sorry i didn't do a chip detection to see what neo programmer sees... i know that it needs at least 2.7V to read 3.3V chip, but somehow it did it...and i tried to compare dumps in hex editor and same chip, different data...one read with 1.8V, other with 3.3V...


    I tried the dump you posted, it's like all the others, it doesn't work, it's always the same... keyboard light, power light,fan spin for a second an that's all...i am thinking there is something else wrong...i disconnected everything...
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  • huzo
    replied to Lenovo T590 bios
    Re: Lenovo T590 bios

    yes it's i7 8gen...that 3.3V that i posted didn't work at all, only three power button flashes,no reaction to any lights,not turning any voltages except 3.3V and 5V on board...but i will give it a try...if you could take a look at the one marked 1.8V...i think ,that one should be repairable!
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  • huzo
    replied to Lenovo T590 bios
    Re: Lenovo T590 bios

    nothing....all act the same...lights up, fan spins and goes dead...all 3 dumps...

    i've attached 1mbit dump also...if you could check?...
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    Last edited by huzo; 07-07-2023, 11:37 AM.

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  • huzo
    replied to Lenovo T590 bios
    Re: Lenovo T590 bios

    ok,manny thanks friend!

    will give it a try when i get home!

    Have you found something corrupted in the dump?

    i forgot to mention, i also have a small dump 1mbit, but i think that one isn't the issue...i will give this a try,and report back...
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  • huzo
    replied to Lenovo T590 bios
    Re: Lenovo T590 bios

    i've tried that dump, along with few others i found here on badcaps...non work ,just 3 blinks on power button, except the original i dumped from the chip that acts like i described...keyboard light and power light and fan spin for a second...

    i didn't know that the exact type and serial is important,but here it is : TYPE: 20N4-000DSC S/N PF-1QDB04
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    Last edited by huzo; 07-07-2023, 02:12 AM.

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  • huzo
    replied to Lenovo T590 bios
    Re: Lenovo T590 bios

    i need to explain something,

    so first time i extracted the dump, i did it with 1.8V adapter by mistake, and then i used the ordinary ch341 to extract the dump...

    and i tried the ordinary 3.3V dump back, and it doesn't work, but the one i extracted with 1.8V adapter works like it did in the first place, (lights,and fan spin for a second)

    i compared the hex files, and they are not the same! altough the size in .bin is the same, 32.768, when packed in .rar it's not the same!

    here are both files, someone...
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  • LENOVO T590 not turning on

    The board is:

    FT490/ FT492/FT590/FT591 NM-B901


    So when i press the power button, the keyboard , the power button, caps lock, numlock lights up for a second, fan spins , and it turns back off, that's it ...

    Ok, so i opened it, i have 3.3V,5V,1.05V when charger or battery is connected, when i press power button, i get all the voltages on all the coils for a second, except VCCGFXCORE_I , if i read the schematics correctly there should be 1.2V,i don't know if this is or isn't important,because i don't know the sequence and is it a condition for...
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  • huzo
    started a topic Lenovo T590 bios

    Lenovo T590 bios

    hello guys, can someone check the dump?

    when power button is pressed, the keyboard and caps and power button went on for a second, and then died... then i tried flashing dumps i found, and now only gives 3 power light flashes when charger connected... i even restored original dump, and it only lights up power button 3 times....no keyboard light or caps or anything...

    the chip is 25Q256JVEQ, 3.3V

    the board is FT490/ FT492/FT590/FT591 NM-B901

    the original dump is in the attachment...
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  • Re: HP 470 G5 blinking amber light no power



    even on usb-c it does the same... i plug in my phone charger and get all the voltages for charging battrery, 3.3V,5V, but the board only blinks the orange light.......
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