Hi guys! I have this board - NM-C421 - the board is fully functional but the charger -> usb c port - gives only 5V. Sometimes it takes 1.5A and without the battery the main powerful is on and up to spec. I replaced the rts5455 for a working one from other working board but still no luck. ps: the board originally came to me not working - I changed a few input mosfets and the battery switching one and now it works. Tho it's not charging as mentioned above. Any idea where to look? Thanks in advance!
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Remove all power and confirm the DIODE mode measurements for the CCx lines. Meter in diode mode. Red meter probe to ground. Black meter probe to pin to test on the USB Type C connector. Checking to see if perhaps a local ESD TVS diode is blown which will cause the BMC communication lines to fail and result in the power delivery contract stuck @ 5v.
Also review this thread:
https://www.badcaps.net/forum/troubl...-with-rts-5455 -
All power removed, there is no short on the CCx lines or any other data lines i checked.
Diode mode - CC1 - 475mV
CC2 - 642mV
Many of the ESD TVS diodes are missing, in my understanding it doesnt really matter (it shouldnt stop the board from charging) - or am i wrong?Comment
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hi bro
can u fixed this problem???
i have sim sim your problemComment
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ali.nb66 , try a bios upgrade from the vendor's website (Lenovo).
The power delivery controller requires firmware that is injected into the RTS5455 using the I2C pins during the bios reflashing process.
If this fails, you can consider the above ideas in the thread which is to source another RTS5455. This replacementcan originate from a donor board or a trusted vendor. In the above thread, one of the techs noted a good vendor that worked for them. The power delivery controller will be blank and then reflashed during the bios upgrade process.
OR
Search for 'NM-C421With program' on Aliexpress to source a controller WITH the program already onboard. This may be most practical. Be sure that the logic board is the same as the OP of this thread = NM-C421. Otherwise, hunt for the controller & firmware that matches your logic board.
If you proceed, update this thread with your progress for future readers.Comment
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Apparently it does not receive voltage from the charger, this is type C.
I have injected 20v into the sensing resistor and the equipment does turn on and give video.
I have not been able to understand how the equipment that uses a type c charger works. I can't find boardview and I'm guiding myself with the schematic that I leave attached.
I hope someone can give me some help to find the problem.
Schematic - https://www.badcaps.net/forum/showthread.php?t=94842
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Thinkpad X13 Gen 3 Not Charging via Thunderbolt seemingly after an update. Ran out of battery and stays at 5V Fan spins for a second when it switches on, but then power button blinks 2 times and goes off
What I have tried
- I managed to extract a TBT.bin from Gen 1 version, but I don't think its compatible, as its not even moving to 20V as before, but stays at 5V only - https://support.lenovo.com/au/en/dow...n-1-t14s-gen-1
- Padded with FF until end to fill 16MB bin and... -
Hi All.
I have an 820-02016 board (A2337 M1) that has come in for data recovery. Reported as liquid damage, but no visible evidence of any liquid damage.
Board was initially stuck at 5v, and current only spiking occasionally to around 400mA and cycling.
After initial troubleshooting, found that C7800 (which feeds the power rail PP5V_BSTLQ_VOUT_SPMU) was dead short to ground.
Replaced C7800 and short gone. Board still stuck at 5v. Current draw behaviour changed. It now spikes up for a second to around 100mA to 130mA, then drops down to... -
hello,
there is an asus gtx1650 which displays fine in windows but if i run a benchmark test it displays artifacts and the driver crashes after a second or two.
I changed pads and thermal paste.
I run mats test but it is reporting 0 errors.
I then tried to run the mods version 400.271_1650 test, it first ran and stopped with a 'breakpoints limit reached after 5 retries' error and the fans went full speed.
After a reboot, I tried to run the test again, but now the test fails and says "ERROR: Couldn't clear GPU's interrupt...02-09-2022, 03:22 PM -
Hi,
looking for the schematics and boardview of the Lenovo ThinkPad 14 G4
Lenovo ThinkPad E14 Intel 12th Gen
Project Code :JEE442/JEE542
Board Name :NM-E211
LENOVO ThinkPad E14 E15 GEN 4 INTEL LCFC NM-E211 JE442 JE542 REV0.1 SCHEMATIC"
Comment