I've checked the power rail of the PCH, 3V_PCH, somehow I forgot checking it for shorts until now - I'm new to this, still.
There was a dead short, upon injecting voltage it drew like ~2,5A at 1V. I could measure the temperature of the Chipset (it's the smaller chip on the CPU-BGA, right?) to be about 35°C at this point, before I cranked up the current a bit too much and now it's "back to normal" with 200-300mA at 3V...
--> I doubt that things that were broken magically heal upon putting way more power in there then is good for them. The unit is dead? (Please confirm)...
seppde
Member
Last Activity: 10-03-2024, 07:04 PM
Joined: 07-22-2022
Location: 01069
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I left the laptop at peace for a few hours and now just wanted to check back whether the battery indicator would again be "working" if I only plug in the battery - it indeed did.
With just the battery and no USB-C I measured
- 1,21V at +3.3V_EC5105 and RTCVCC_EC
- 7,0V at B+
- No voltage at 3V3/5VALW - UNLESS I press either the power-button OR the battery indicator button. In both cases ALW gets asserted and 3V3/5VALW get generated. And in both cases the battery indicator lights light up, nice and strong.
So somehow the EC still reacts to button...Leave a comment:
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I've made some progress and hope my procedure isn't too questionable:
When I supplied 3v3 at the RTC Connector, the 3V3/5V converter would come up immediately upon plugging in the USB-C cable.
This, too, drove most of my attention to the area around the MEC5105.
As I was measuring 682Ohm on the 3V3-Rail, which I believe is much too low, I was taking a guess on the MEC being defective and therefore decided to cut the trace at RE252, separating +3VALW and +3.3V_EC5105.
Now:
- I get 3V3/5VALW upon plugging in the USB-C without additional steps
- The +3.3V_EC5105...Leave a comment:
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Thanks for your ideas.
+3VLP as well as VL (VL is not used as far as I can tell) are present
Same for ENLDO_3V5V.
The ALWON-Signal is LOW, which is the reason for the main power rails not getting enabled.
(Same as with 3VALW, if I pull up the ALWON-Enable-Pin on the 3V3 converter, it turns on and stays)
I'll look into the EC-requirements.
I forgot to mention that the battery is not charging either. That could be a problem of deep-discharge and the Controller-IC locking out the battery. (The fuse on the battery is OK)
Could it also...Leave a comment:
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Dell XPS 9380 No Power - After providing 3VALW and 5VALW once, they persist - still no power-up
Hello everyone,
I've recently gotten my hands on a defective XPS13 9380. I will attach a zip of the schematics and boardview.
My first discovery on the Board was that the reverse current Diode PD103 of the 1st USB-C was blown.
Nothing to worry about, the board got 3 USB-C ports which support Power/Charging. On I go.
Next I inspected the power-rails to see why the diode blew up and found a short on the 3V3 rail which I traced back to the Power-IC for the LCD (UZ2). I desoldered it and the very low-ohmic short is gone. I checked on the LCD-connector that there's no short... -
Can you tell me which website you used to filter for those components?...Leave a comment:
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I'll see if I can get it under a microscope.
Thanks for that table, that looks as though there aren't that many options actually and probably one out off all those might do the trick.
...
Leave a comment:
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Benq Zowie XL2540K / Power board failure / 6Pin-SOP-Chip identification
Hello everyone,
I've got a Benq power board of a XL2540K monitor which suffered from a power cut and is since defective / won't turn on. It's got obvious defects, some blown resistors, some burning around the drain pin of a MOSFET...
... and some 6-pin IC I struggle identifying, that is driving said MOSFET.
The IC is labeled as IC601, so someone with a circuit schematic could probably identify it really quick, unfortunately I can't find the schematics.
In other power boards of Benq for which I did find the schematics, IC601 is an 8-pin NCP1200 PWM controller - I suppose... -
On further investigation, I've found the USB-PD chip (CYPD5125) getting warm and the whole circuit drawing about 0,14A at 5V. (tested with USB-C Tester)
Datasheet of the Cypress PD-Chip: [URL]https://cdn.badcaps-static.com/pdfs/fca69393bf6a0852fc8c5b7761ccdb14.pdf[/URL]
Between Pin 31 (VDDD) and GND I measure 0,9V - according to the datasheet, that should be around 3,3V, usually, when the CYPD5125 is powered via VBUS (on VBUS I measure the 5V USB voltage)
Also, between VDDD and GND there's 6,3Ohm up to ~7,6Ohm and that's temperature dependent - the colder the chip, the...Leave a comment:
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HP Elite x2 1013 G3 - da0d99mbai0
Hello guys,
I'm looking for the motherboard schematic of the HP model
HP Elite x2 1013 G3
The board number should be : da0d99mbai0
It seems impossible to find on the internet.
I'm trying to repair this convertible of my brother which does not turn on anymore and doesn't show any LED lights when the charging cable is inserted.
I've measured 5V (of USB-PD) at the first PMOS which comes after the USB-ports - nothing else so far, no blown components.
If anyone can help with the schematic or boardview it will be appreciated.
Greets... -
Re: YOGA 910 NM-A901 Schematic Request
Hello everyone,
I hope I act in order with the guidelines here
I'm looking for the schematic of the right IO Panel of the Yoga 910 with the part number being [B]NS-A902[/B] for the following reason:
I've got a defective Yoga 910 which I purchased cheaply and which supposedly only had a defective audio and USB-A Port. The Laptop internally is split in a left IO-Board with the charging connector, the mainboard itself and the right IO-Board with the USB-A Port and the Audio Plug.
I figured...Leave a comment:
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Re: New Members - please post your introductions here
Hello everyone,
My name is Sepp and I am studying electronical engineering at the technical university of Dresden in Germany.
As long as errors on circuits boards are visible I usually have no problem fixing something myself and it's a joy always to see a device working again afterwards.
Programming-wise I got experience with C++ and Python and programmed a few GUI-based programs using Qt with either language. I kind of skipped the arduino and raspberry hype, own projects are often done with STM32 because...Leave a comment:
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