I removed that component. One side is 1.3Ohm to ground. The other side should no reading.
I took another same component from the other board and replaced it.
Interestingly, when I plug in charger, the voltage is now 5V instead of 19V.
When I plug in USB stick, the vcc is still 0V....
theflyingsquirrel
theflyingsquirr
Last Activity: Yesterday, 02:16 PM
Joined: 02-21-2025
Location: Toronto
-
Thanks. I will definitely get that tools.
I did some micro inspection around the transistors that is relating to the cc1 and cc2 pin. I found one component that looks like it is melted as shown in the attached pictures. It is a black piece that marked M. I took a photo of another board of the same model to make out what this smd should look like. I don't even know what is it....Leave a comment:
-
I am trying to read and understand the USB-C standard and it seems that cc is the same pin as Vconn that can supply 5V 1W.
Perhaps the transistor switch that connect to Vconn is blown closed. I really wish I have a schematic....Leave a comment:
-
Need Samsung Chromebook Pro XE510C24 Schematic
Hi everyone, I have a Samsung Chromebook Pro XE510C24. It has some problem with USB-C shorting. Does anyone has a schematic for the PCB of this board? -
Ok. The USBC expansion board finally arrived!
I measured the value between 3 stages with it on 2 computers. One known good one and the defective one and get the values in the table in the attachment.
State 1: No connection
State 2: Connected with USB stick
State 3: Connected to charger
It seems that the values are mostly the same except that when connected to USB stick, there is 0 voltage on D+ pin and Vcc pin.
One of the CC pin has 5.1V so it should be calling for voltage on Vcc to power the USB stick but none showed up.
I am thinking may be the...Leave a comment:
-
It is a Samsung Chromebook Pro XE510C24.
I can't find the schematic and a quick search in the schematic forum show no result.
You know if there is any other place I can search?...Leave a comment:
-
I took some photo of the reworked area. I think the chip is soldered ok. I added picture of the battery pack too.
Also I used the USBC tester with usb hub, external power source and USB stick and it seems that there is a -2.19V on data- line.
I checked with another same model with the same setup and the data- line briefly show 0.02V and then become 0V. So the 2.19V may be a sign of something wrong.
I measured the battery connector voltage and it is 8.59V when the power adapter is connected.
I am ordering an usbc expansion board in order to further test the USBC port...Leave a comment:
-
I will take some picture of the rework area when I get a chance to open it again.
I used a USB C tester to test when charging and it seems that the charging voltage is almost 20V while the battery is rated for 7.5V. I am not sure if that is normal. I will attach a picture of the test result. There is 0V in data line.
I tried to measure the USBC port with diode mode, but the pin is too small and some pin are inaccessible to measure. I will have to get an expansion board to plug into the usbc port to measure.
It is not likely as I have a few machine of the...Leave a comment:
-
I replaced the STM32 and there is no change in performance. The chip is not heating up fast anymore but USBc port still does not detect my USB stick. Kind of disappointed.
Leave a comment:
-
Thanks. Luckily, it is qfn. I will try swapping with another one from other board to see if it works.😁...Leave a comment:
-
It was from picture I took before. That part has been fixed already.
The stm32 got to 69 degree C fairly quickly. I am thinking it is damaged from usbc port shorting.
I removed the PI3 chip before I used the thermal camera thinking that is the damaged part....Leave a comment:
-
Can I strip it from another same model board? Would the content be unique to each board?...Leave a comment:
-
I used a thermal camera to check when it is on. I find that this chip got really hot.
STM32F051C8U6
I searched and it is MCU 32-bit ARM Cortex M0 RISC 64KB Flash 2.5V/3.3V 48-Pin UFQFPN EP Frame.
Anyone know what it does?
May be I will try to replace it and see if it will work....Leave a comment:
-
Yes those are just flux. I tried cleaning with alcohol and brush, but it is remain there. It is not solder for sure.
I noticed when I plug in some charger, the charging is intermittent. But some lower rate charger seems fine.
I ordered new USBC ports. I will try to put it in and when I received it and see if the other port act differently.
Do you think some capacitor or resistor is shot? Or worse, some trace are burnt?...Leave a comment:
-
I've uploaded more pictures. It seems fine....
Leave a comment:
-
I see. OK I will take more picture of it when I get to the board....Leave a comment:
-
I did not solder in a new USBC port yet.
But the other USBC that is connected with flex cable to this PCB is not detecting anything.
I was thinking the USBC are probably connected to the same hub.
I added a picture with the flex cable....Leave a comment:
-
Chromebook USB-C no longer recognized USB devices after shorting
I have a Samsung chromebook Pro and one of the USB-C port have something inside and was shorting. The particular thing look like a loose soldering debris. It was at a bit off middle so I think it was shorting the vbus and data pin. I ended up desoldering the whole usbc port and removed it. Upon removoing the usbc port, the chromebook boot again. I can charge with the remaining usbc port (now I found out that when I charge with higher power charger, it does not work), but I cannot get it to recognize any USB stick I plug in. May be the handshake is gone? In the pictures, you can still see the USBC... -
I like DIY repair a lot.
I open up phones and laptops and mess with it. Most of the time it will not be working properly afterwards.
I am into microsoldering....Leave a comment:
No activity results to display
Leave a comment: