Hi TecnicosES, you will find a schematic and boardview here:
https://www.badcaps.net/forum/troubl...-and-schematic
Please follow the informations from mon2 and especially the values you may have for each power line (in diode mode). It can help a lot to find any secondary line shorted that may prevent post.
I don't have functionnal board available to make some readings but from my memory the negotiation...
titomno2
Senior Member
Last Activity: 04-22-2026, 09:20 AM
Joined: 08-09-2020
Location: Acigné
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Still looking for parts that may enter in the sensor 4 for this measurement:
Not sure if it is the right parts but I want to look at the R7957 and R7956 as these resistor are near the GPU and 10K make me think to some sort of NTC.
Can someone tell me what is a 10KR2J-L-GP I found a lot of it on many schematic but can't find any datasheet....Leave a comment:
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Some more information.
Looking temperature with HWinfo64 the temperature sensor n°4 is completely fuzzy going from 2°C to 188°C.
At 2°C fan RPM is set at 0 (no rotation).
At 188°C fan RPM is set at 4000rpm (full speed for both fans).
Here after is the strange dent of the sensor 4 like some sort of capacitor discharge and a repetitive waveform:
For the moment visual inspection did not show me any defective part, and i'm stuck to find if the thermistor is an NTC or something else.
The schematic are not very usefull as nothing is given information for the...Leave a comment:
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Dell G3 3590 SELEK_N18E_MB error 2000-0314
Hi,
I have a Dell G3 3590 ( SELEK_N18E_MB 18812-1) and the Nvidia GPU is permanently deactivated following error 2000-0314.
Basically it say the thermistro GPU is out of value (cold start It ready 120°C permanently).
I need help to understand what piece of hardware may have failed and how to replace it as everyhting was working fine and the thermal paste was removed and replaced by PTM7950 properly.
All schematics are available on the forum and if someone could be able to help me and give me direction on what component to check first.
I found THM261 on the back of... -
Surface Pro 7 type 1866 PD controller firmware issue
Hi guys,
Hope you are fine.
I'm struggling to fix a small issue with one of the tablet Surface Pro 7 type 1866 i'm fixing (windows 11).
The boot time is so long (up to 5-10 minutes).
After several attempt I finally find one thing is not right (PD controller firmware is 0.0.0 it can't update to 3.6.1) under device manager I have a yellow mark, code 14 and error as decribed on picture attached.
I don't find any information regarding the error code 0x1803 (and sometimes it change to 0x1804.
In the past I have found that if the update is a success, the boot... -
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...Leave a comment:
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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).
Thank you.... -
Finally the power button was the culprit.
With all information shared with mon2 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.
Both boards are working.
Have a nice day guys....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?
Last...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)
My son is sick today so no more digging this evening......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).
Don't hesitate to ask me other measurement (it wil take time as I will be at work all the week)....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
...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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