So the 2N7002K is not the optimal solution, it worked few minutes and then no more, it seems that the gate is not activated with enough power (3.3V on the source and only 2.5 to 2.8V at the drain).
So I decided a dodgy fix by replacing with a 0Ohms resistor between the drain and source (of course I loose the opportunity to go in plane mode) => it works well.
I have still an issue, the battery charging reaching 55W on the dc jack when computer is working, which is too much for the 45W adapter ! I don't know why it drain so much power (current sensor drift ?).
Fun fact...
titomno2
Senior Member
Last Activity: 03-30-2025, 09:57 AM
Joined: 08-09-2020
Location: Acigné
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I have removed the SOT23-3 component, and made some measurement.
The bottom pin on picture is 3.3V.
The right pin on picture is somehow related to the 3.3V for the pcie ngff slot
So I assume the top pin is the gate.
I tried the 2N7002K as replacement but it seems that the wifi card is still not powered (I have tested the card somewhere else and it was performing normally).
Some of you may have some idea as I am still unable to find any schematic or picture of component I should put in place?Leave a comment:
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HP Probook 440 G9
Hi need schematic and boardview for DA0X8SMB8H1 Rev:H to identify burned component sot23-3 beguinning with 20xxx. -
HP Probook 440 G9 No Wifi
Hello everyone,
Trying to fix a Laptop HP Probook 440 G9 with no wifi.
Motherboard is DA0X8SMB8H1 REV.H
Symptoms was the student could not shutoff the computer and when inspecting the computer I found the following component burned (SOT23).
Sorry can't find a boardview or schematic.
If anyone has any idea, I see at least 200 and maybe a 5 or 6 at the end (see pictures).
[ATTACH=JSON]{"data-align":"none","data-size":"full","data-attachmentid":3590992}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-size":"full","data-attachmentid":3590993}[/ATTACH]... -
Finally the power button was the culprit.
With all information shared with [USER="295753"]mon2[/USER] I have learn enough to solve another issue on a second board.
If someone have the same issue he can test by shorting with a wire or metallic tweezer the pin 1 with ground.
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3584514}[/ATTACH]
Both boards are working.
Have a nice day guys.mon2...Leave a comment:
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Hello,
Some updates.
I have received a new battery and tried it, the charging is working properly.
So I checked again for the button but the accessibility of the pins is too small for my probes.
And making measurement lead me to touching the read terminal of R5819(3.3V) and the SIL_SLP_S3_DRV#(1.8V) following that Have the feeling the processor getting hot (and it was properly).
So if someone can give me some advice on how to properly test the power button and or simulate the power button behavior I can double check this?
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3583429}[/ATTACH]...Leave a comment:
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Without power I measured some resistors around U6001 to find something close to the value 6.8OHms.
The R6023 is not populated
The R6022 is measured at 6.8Ohms
The R6021 is measured at 5.6kOhms
The R6012 is measured at 500Ohms
According to the schematic R6022 should be 10kOHms and R6021 should be 11.8kOhms.
Even if my multimeter is not a top one usually I have readings close to specifications....Leave a comment:
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So injected 0.7V limited to 2 Amps.
But nothing only 0.1A consumption and nothing heating up, (to be honest not very surprised as the resistive value was quite high 6.7Ohms).
I think I have to dig on the U6001 (but I'm afraid it will drive me to the CPU at the end)
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3581134}[/ATTACH]
My son is sick today so no more digging this evening...So injected 0.7V limited to 2 Amps.
But nothing only 0.1A consumption...Leave a comment:
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Around the 1.1V coil I have 6.58Ohms on left and almost the same on the right side of the coil.
It seems a bit high for a direct short, I will try to inject 0.8V this evening after work (I have a thermal camera so if anything is obvious I should be able to see it).
I hope the PCH or CPU are not fried, my friend told me he struggleling more and more to power on the tablet and was thinking the power button was bad!
I keep you posted.Leave a comment:
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Very instructive. So with red probe on the ground and multimeter on diode mode here are the results:
Voltage Picture On my board
0.68V 500 523
3.3V 351 406
1.1V 23 0 (giving 1.400 and drop to 0 real flat)
8.7V 625 680
8.7V 508 577
1.68V 25 91...Leave a comment:
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Hard for me but I think I have the information (the boardview and schematic are not easy to understand).
So measured voltage at pin 1 of the R3411 and read 1.788V so I assume VDD are OK.
Measured also SAM_RESET#R on C3419 pin 1 and read 1.783V so I assume RESETN is OK.
So I assume the NXP ARM Cortex M4 is powered.
It is quite painful to find area to check the value without touching the shield.
SL1_HPD2_EN = 0V
3P3V_HDP_EN = 3V
3P3V_HDP_VIN = 3.3VLeave a comment:
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If you mean the Pin#15 (of the U5904) I have 0V when the DC is plugged led power on.
I read it from the capacitor C5919 as there nothing else related to this pin.
On the board the R5908, R5906 are not populated, only the C5919 is present and did not find short to ground (1.2MOhms without power supply).
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3579457}[/ATTACH]
Don't hesitate to ask me other measurement (it wil take time as I will be at work...Leave a comment:
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I removed all the power.
Made the measurement on the port 2 of the coil and the result is strange!
It start at 500kOhms and decreasing rapidly to 10kOhms, go up again to 20kOhms and decrease again.
Did not see anything wrong on the bunch of capacitors just on the right
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3579381}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid&qu...Leave a comment:
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Surface Pro 7 1866 won't turn on...
Hi guys,
Just have a surface tablet pro 7 (type 1866) with motherboard JALAMA_ICL_MB DV:2.0.
Can't power on the surface tablet, no reaction on the button whatever the charger (working) is plugged in or not.
After dissassembly I made a physical inspection without seeing any damaged component (nothing visible at least).
Made measurement:
With battery (low voltage 7.9V) the led D7013 is on (red)
Charging seems odd and decided to let it apart and working only with DC input.
With power supply 15VDC (white light on the charging cable).
D7013... -
Hi guys,
Small update, the cpu is fried.
After carefully replaced both controller, the cpu is heating on one spot... it is fried explaining why I suddendly don't have any respond from the motherboard.
Subject is closed for me.
Thank to all your support.Leave a comment:
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I think you where talking about the U4508 (can't fin the U4580), neither the Q4504 (it is on schematic, but not on boardview (when searching for it, adobe give me the space for left fan !!!
Whatever at first the screen was working fine (start, restart and stop) stopped to working when asking for deepsleep.
I was only able to measure the EN PIN 2 of U4508 and it show a proper 3.3V in all condition (screen working or not), also confusing that I have each time a picture on HDMI and display port.
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3562516}[/ATTACH]...Leave a comment:
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Hi pc_okay,
Indeed you think it could be an issue with the switchable edp.
I will check if I can do that because it is at the worst place possible juste under the heatpipe of the heatsink ! between the gpu chip on the left and the processor on the left (the 42 chip)
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3560533}[/ATTACH]
I cannot remove the heatsink as it heat up so much quickly I will certainly kill the processor in the operation.
...Leave a comment:
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Hi, some updates.
I have unsolder the 0603 capacitor on the board of the panel => measurement was tricky and capacimeter telling something like 2.6µF (but I have sometimes lower readings in nF).
So I replaced with a murata 0603 1µF 10V (ce closest as I have) (25V and 50V are very low capacitors from 22nF to 100nF not much).
As it is the initialisation chipset the voltage must be 3.3V (I have measured only 3.3 and 16 to 20V for the main power (assuming for the backlightning).
Powering the laptop from cold => Screen works and I was able to play more than 1hour...Leave a comment:
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Following request of moderator to keep the forum clean and usable I have posted the boardview and schematic in the following post.Leave a comment:
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ASUS GX701LSX REV1.3
Hi guys,
Schematics and boardview (PDF sorry) for those who have to fix this big motherboard.
Best regards...
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