Docus
Member
Last Activity: 09-08-2025, 01:22 PM
Joined: 06-10-2025
Location: rhone
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i forgot to ask if the voltage (0.84v) is normal or not... -
i can't find any point of heat with my hand (it is the right spot where i inject voltage ? )...
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so, i remove the pl602 and on one side i see 1.441 and on another side i see 000.4 so i think the short is in the RT6585 side...
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i checked the lenovo chip and nothing happen , a also tried with 1.5v but also nothing.
I remember that before i try to solder anything ,the rt658 was the only component that evaporate when i plug the charger and the last time i test it he doesn't do anything......Leave a comment:
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i don't have another battery bt i have another multimeter and it shows that :
pin 3 : 003.4
pin 8: 000.7
Pin 13: the value keeps rising
Pin 14: the value keeps dropping...Leave a comment:
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i cannot say if the alchool evaporate with the room temp or with the chip temp but i'll say that i don't see the difference bewteen the time i put the voltage and the time i put nothing so i thinks nothing happen...
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i test it like this or between the pin 8 and pl602 ?...
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Oh thanks you very much, it make sense now so in this order its :
Pin 3 = 03.0
Pin 13 = 1
Pin 8 = 00.7
Pin 14 = 1
so i inject voltage on the green dot and also the yellow cap ? (3 and 13 ? ) (and between the gnd and the dot in question) and what i'm supposed to see ? what i have to do ? spay some isopropylic alchool ? see if it vape ? can something explode 😨?...Leave a comment:
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So, i have to inject 1v 2a here and here ? ( waiting in response to do anything )...
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No, i have this... its seems that i dont have the right shématics, with yours i have those values :
Pin 3 = 1
Pin 13 = 2.7
Pin 8 = 1
Pin 14 = 1...Leave a comment:
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ah i didnt see that there is a page 2 😮Leave a comment:
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oh ok thanks ou very much, the brown wire is the red test lead ( i have a good pair of test lead but i forgot them i my dad's car and always forgot to take it back🤣 .So if i understand, i have to measure them with the ohms and give the number dispalyed ? if its correct, there is the results :
Pin 3 = 03.0
Pin 13 = 1 (OL ?)
Pin 8 = 00.6
Pin 14 = 1 (OL ?)...Leave a comment:
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Oh ok i understand, so :
Pin 3 = beeping
Pin 13 = not beeping and display 1 ( its the equivalent of OL i guess)
Pin 8 =beeping
Pin 14 = not beeping and displays 684...Leave a comment:
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between the pins:
pin 3 to PC603
pin 13 to PC601
pin 8 to PL602
pin 14 to PL601
and its beeping for all of them...Leave a comment:
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i said that a have a lot of material but i doesn't have an oscillator because i don't know how to use it 😅...Leave a comment:
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Personally, if I want to repair it myself instead of leaving it to a professional, it's purely out of passion. I actually enjoy it much less doing it myself than letting a repair technician handle it — sure, they’ll fix it for money, but I wouldn’t get any satisfaction from seeing the PC repaired that way. I understand that attempting this kind of repair on this type of motherboard is very risky, but I don’t have anything else to work with......Leave a comment:
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oh, i forgot to show you something. During my surgery with the rt685 chip, i accidently destoyed some coil under the cpu and put them back , are they still living or are they death ( i plugged the charger to test the rt685 chip after resolderind those coil )...
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i already solder it after i desoldering it the last time. i tested them :
- +3VLP (via PC603 / PJ603),
- +5VLP (via PC601),
- +3VALW (via PL602),
- +5VALW (via PL601).
PS: i added image of the bq47 and rt658 after the surgery 😭...Leave a comment:
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Thank you very much for your feedback and advice even the criticism, I take it all in to learn and improve. 🙏
To clarify the situation and avoid misunderstandings:- Yes, I removed the RT6585B (PU601) after noticing that it was heating up significantly as soon as I plugged in the charger. It was no longer on the board when I took the last measurements.
- The BQ24780S is still in place, and I never observed it getting hot. It does deliver 20V to pin 28 (VCC).
- Voltage readings on the other pins of the BQ24780S (with the RT6585B removed) showed mostly 0V or 0.3V, except for pin 6 which
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In the meantime, I tried to remove the chip that I thought was at fault but the short circuit is still present and I'm afraid I've made the case worse (the chip heats up for a tenth of a second then nothing) and while trying to remove the track from the dead BQ24780S chip I took measurements and it displays 20.6v on the first 3 pins, 26v on the 4th pin, 0v on the 5th pin, 2.9v on the 6th pin and 0v on the 7th pin, I don't know if it's normal so I unsoldered it to try to measure the values without the chip and this time I have 20v only at pin 1 and 28 and 0 in the others except the 6th pin...Leave a comment:
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