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Sir, in this line D4404 has no components, thank you [ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3306516}[/ATTACH]...
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I have several of these boards sir with the same case [ATTACH=JSON]{"data-align":"none","data-size":"large","data-attachmentid":3306506}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-size":"large","data-attachmentid":3306507}[/ATTACH]I have several of these boards sir with the same case [ATTACH=JSON]{"data-align":"none","data-size":"large","data-attachmentid":3306506}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-s...
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Can you please help me look at the shematic and find the problem, sir, thank you very much...
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I have several of these matherboards with the same case type C port B with USB type c meter only shows 5v, while port A is fine the laptop can turn on normally2 Photos
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Before that, thank you for your interest in helping me, sir, here are the measurement results
emove all power. No battery
meter dioda mode
port JUSBC1 (port A)
USBC_CC1_CONN 0.618
USBC_CC2_CONN 0.618
port JDOCK1 (port B)
USBC_CC1_CONN 0.618
USBC_CC2_CONN 0.618
with adapters
port JUSBC1 (port A)
USBC_CC1_CONN 5v
USBC_CC2_CONN 1.6v
port JDOCK1 (port B)
USBC_CC1_CONN 0.618
USBC_CC2_CONN 0.618
USBC_CC1_CONN 0v
USBC_CC2_CONN 1.6v
...
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hi.. yes, we are in different time zones, I am in Asia, so when it is night here, it is daytime, sorry for the delay in giving me an answer
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Please help, this is a schematic, thank you
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/85066-lenovo-thinkpad-nm-b461-l480-l580-el480-tvw[/url]https://Please help, this is a schem...l480-tvw[/url]
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please help, friend, thinkpad L480 NM-B461 rev 1.0 JDOCK1 type C port 5volt only, thank you
I have a thinkpad L480 NM-B461 rev 1.0 laptop functioning normally with Type 1 port (JUSBC1)
if you use port type C 2 (JDOCK1) with a usb type meter it only displays 5v, thank you
I tried to look at the schematic diagram USBC_VBUS20, which is the port path from JusBC 1 to U4701 then goes to the system2 charging IC, why is there no system2 path leading to the charging IC on the TYPEC_VBUS20 port which is JDOCK1, thank you for your help.
if you look at the power sequence there must be 2 types of port type C a (JUSBC1) via U4701 and port type C b (JDOCK1)
On the type...4 PhotosLast edited by fredyjbi; 07-10-2024, 12:33 AM.
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thank you sir for your help, yes this case is very strange sir still the tamper error, I have checked the bios security position is disabled, thank you [ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3291560}[/ATTACH]...
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Sorry sir, I am late in giving an answer, sir, I have removed the pin 2 to 3 jumper, and also replaced the R646 resistor but the results are still the same, thank you and where should I check again
sw3
pin1 3.3v -INTRUDER_PCH
pin2 3.3v
pin3 3.3v
pin4 0v
D5
pin 1 3.3v
pin2 3.3v -INTRUDER_EC...Last edited by fredyjbi; 06-16-2024, 07:51 AM.
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please help friends thinkpad T470 error post "bottom cover tamper detection error"
please help friends thinkpad T470 board CT470 series NM-A931 error post "bottom cover tamper detection error"
I've already
flashed the bios clean me and updated from the Lenovo site, then removed the switch and immediately jumped the S3 from pins 1 to 4, 2 to 3 but the problem remained the same, thank you1 PhotoLast edited by fredyjbi; 06-15-2024, 10:00 AM.
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sir there is good news I replaced the broken PF9 now I have 10.2v on VSYS_OUT but the board won't turn on
SYS_OUT 10.2v
PL201 VCC5M 5v
PL202 VCC3M 3.3v
PL701 VCC1R0_SUS 1.05v
PL702 VCC1R8_SUS 1.8v
The board can't turn on yet, where should I investigate so that this board can turn on, sir, thank you
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Oh, that means sir, it's not a problem with the charging block, because the charging IC produces the VSYS_OUT vin, and sir, I compared it with a normal board which is different only on the PL701 VCC1R0_SUS 18 ohm, on the normal PL701 board 28 ohm, thank you very much sir for your help...
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Meter in resistance mode auto range
PL201 VCC5MP 989 ohm
PL202 VCC3M 900k ohm keeps dropping
PL701 VCC1R0_SUS 18 ohm
PL301 VCC1R2AP 350 ohm
PL702 VCC1R8_SUS 1,2M ohm keeps dropping
PL101 17K ohm
PL403 VCCGFXCORE_I 10 ohm
PL401 VCCCPUCORE 7 ohm
PL402 VCCCPUCORE 7 ohm
PL404 VCCSA 21 ohm
L6 VCC0R9_TBT_SVR 1,6 k ohm
L51 VCC3_SUS 700k ohm keeps dropping...
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