Thanks for your reply
i have replaced the two switching mosfets and now i get charging light but the board pulling 0.3-0.5A fluctuating
but now i hear clicking sound from the mosfets /chatger IC area, i have tried another SC8885[U][B]L[/B][/U] and i am getting the noises as well
I only have BQ25700A in stock and i cannot believe the customer will wait for an order
do you think it can come instead of BQ25710 ?
Any other suggestion ?Thanks for your reply
i have replaced the two switching mosfets and now i get charging light but the board pulling 0.3-0.5A fluctuating
koby058
Badcaps Veteran
Last Activity: Today, 02:05 PM
Joined: 01-18-2017
Location: JERUSALEM
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CHRG_OK is 2.8v and i understand it must be 3.3, is this correct ?
pin detail from chip schematic
Open drain active high output. CHRG_OK outputs logic high indicating VBUS is in the range of 3.5V
to 24V and no fault occursLeave a comment:
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so i found that the charger ic was shorted, i have replaced it again and now i have charging light but still not charging
on pin 22 i can see that i have batt voltage
ican see that batdev is 0
can yoo advise on how i can continue here ?Last edited by koby058; 04-07-2025, 10:00 AM.Leave a comment:
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I cannot find it, i measure the one on the attached pic (red dot)
left side 0.4v right side 0v
I can also see that on the charger IC pin7 vdda looks shorted with only 1.6ohms...Last edited by koby058; 04-05-2025, 02:50 PM.Leave a comment:
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The gate is shorted to ground,
I am not sure i understand you on this line:
Short answer is that, the gate voltage should be 0v or ground from the EC. Only if the gate is OFF = 0v, then you will have a voltage @ [B]PWR_CHG_ACOK[/B].The gate is shorted to ground,
I am not sure i understand you on this line:
Short answer is that, the gate voltage should be 0v or ground from the EC. Only if the gate is OFF = 0v, then you will have a voltage @ [B]PWR_CHG_ACOK[/B].The gate is shorted to ground,
I am not sure i understand you on this line:
Short answer is that,Last edited by koby058; 04-05-2025, 02:30 PM.Leave a comment:
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I can see that on pin4 CHRG_OK is missing, also on the left dual mosfet i see 12.5v or 5v when no battery, what is changing the voltage to 12.5v from 20v?
Can any one advise?Leave a comment:
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Thanks mon2 for you reply, in this schematic it looks like a bq25710 chip not southchip
Also, how would you suggest me to continue the debug?
Is thee a post/video that explains how main power rail is created in this kind of circuit ?Last edited by koby058; 04-04-2025, 09:00 AM.Leave a comment:
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Lenovo Flex not charging
Hi people!
The board is LC57-IAU MB 213062 -1M.
[URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/3280925-lc57-iau-mb-213062-1m-lenovo-ideapad-flex-5-14iau7-high-res-scans"]Here[/URL] is High res board picture, i could not find a schematic
what i have:
the board is working on battery, without battery type c remains on 5v with battery it is changing to 20v (0A pulled by board), but it powers on.
charging IC...Last edited by koby058; 04-04-2025, 03:50 AM. -
Hi, thanks for your reply
main power rail 13v
19V_DCBATOUT_LCD 13v
BL_EN 0v
_LCD_BRIGHTNESS 0v
as i can see BLON_OUT is not cmming out of pin 27 of EC
with flashlight no display that i can see
how do you suggest to continue?Last edited by koby058; 11-11-2024, 11:10 AM.Leave a comment:
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Lenovo IdeaPad Flex 5 motherboard LC56-14T no display on screen
Hi people,
schematic: [url]https://www.badcaps.net/filedata/fetch?id=3204734[/url]
I have this laptop, it is working an posting but there is no display on the screen.
external screen works
inspecting voltages on lcd connector: main power rail present, 3D3V_LCDVDD_S0 present, LCD_SELF_TEST_ON_EC not present, SENSOR_LID_OPEN_N
and LID_CLOSE_N both have 3v
different lcd same issue
Can you help me debug it ?https://Hi people,<br /> <br /> sche...e this laptop, -
Thanks for your answer
Will a re flaw work ?...Leave a comment:
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Lenovo E14 not working on charger works on battery
Hello.
I have this laptop Lenovo E14 AMD
when connecting type c power, the amp meter shows 20v, for a second it goes up to 0.5 amp and then back to 0.27amp
the laptop works on battery.
pushing 12v on PL3 make PU6 get hot, when removed PU6 and pushing 12v no power is pulled by MOBO
Resistance on PU6 pin 2 is 4ohm
Any advise how to continue ? do you think replacing pu6 will make it work?
attached schematic... -
Lenovo Flex 5 self power on no post
Hi Everyone,
Lenovo [B]Flex 5-14IIL05 Laptop (ideapad) - Type 81X1[/B]
Laptop powers on however blinking power light and caps lock and esc key lit.
I have tried a clean bios and also replace the bios chip and got same results.
When connecting to power supply it pulles nearly 1 amp steady, fan is spinning cpu getting worm no post
Any advise ?Hi Everyone,
Lenovo [B]Flex 5-14IIL05 Laptop (ideapad) - Type 81X1[/B]
Laptop powers on however blinking power light and caps lock and esc key lit.
I -
Hi i have flashed this bios and get same issue...Leave a comment:
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Thanks!! was DMI transferred or i should transfer it ?...Leave a comment:
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Hi Everyone,
Laptop powers on however blinking power light and caps lock and esc key lit.
Can any one help in with clean bios?
Lenovo [B]Flex 5-14IIL05 Laptop (ideapad) - Type 81X1[/B]
BIOS IC: 25Q128JVSQ
s/n: R90ZTCPXHi Everyone,
Laptop powers on however blinking power light and caps lock and esc key lit.
Can any one help in with clean bios?
Lenovo [B]Flex 5-14IIL05 Laptop (ideapad) - Type 81X1[/B]
BIOS IC: 25Q128JVSQ
s/n: R90ZTCPXHi Everyone,
Laptop powers on however...Last edited by koby058; 09-08-2024, 03:30 PM.Leave a comment:
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reformatt[USER="302067"]reformatt[/USER] thanks a lot helped meLeave a comment:
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Hey mon2, As you can see Fauda continues in reality with full power
it is 5018SG
By your question, i guess it is this one : [url]https://www.mouser.com/datasheet/2/149/FDPC5018SG-607345.pdf[/url]https://Hey mon2, As you can see Fau...7345.pdf[/url]Leave a comment:
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Help identify MOSFET ALA49EX
Hi Gentlemens,
Can any one please help identify this mosfet (power supply of CPU) from asus gaming laptop ? (ALA49EX)
one picture to show how it looks from bottom...Last edited by koby058; 04-14-2024, 12:39 PM. -
Hi, I did not find. i ordered a new one from aliexpress. i also fail to program it with the rt 509f and used the vertianov to program itLeave a comment:
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