Part # SN1904020AYBFR
https://www.aliexpress.com/item/1005..._new_user%3A-2...
mon2
Badcaps Legend
Last Activity: Today, 11:58 AM
Joined: 12-15-2019
Location: Windsor, Ontario
-
Hello. Pour some IPA (alcohol - pharmacy stuff is great) to enhance the markings under a light.
The top horizontal bar = MPS.
For 'BHA' = MPS part # MP2672GD
You can source this part from Digikey and other authorized distributors or from Aliexpress.
Datasheet is attached.
...Leave a comment:
-
Remove all power, measure the resistance to ground of Vreg3. What is the resistance in ohms? There could be a shorted part on this rail....Leave a comment:
-
The laptop boots otherwise? Then cpu is ok....Leave a comment:
-
So there is a partially shorted part on this rail. It could be the pch (cpu). 54R ohms is too low.Leave a comment:
-
Remove all power. Meter in resistance mode. Measure the resistance to ground of this 3v3 rail. What is the exact resistance in ohms?...Leave a comment:
-
If you study the datasheet from TI for the same part, the same pins should also be in a common bus. I think you will be fine here to just replace the part. Do inspect the target SSD devices and test their resistance to ground. That is, if this regulator blew up and allow for the high side mosfet to leak and supply the high voltage directly to the SSD (as per the shared videos) then the target SSD will very likely be damaged and with a pimple or hole on the die of the package. That is, the SSD must also be replaced. You can purchase pre-flashed / configured SSD from Aliexpress or use the P15 programmer...Leave a comment:
-
Post the same request inside the dedicated bios sub-forum. Someone there will be be able to assist. Posting here may cause SMDFlea to break into your home and steal your halloween candy....Leave a comment:
-
For sure clean up all areas of the liquid damage / green pond scum.
Gently scrape the ball that appears to be burnt so that you have apply a bit of solder to complete the connections with the WLCSP packaged TPS62180. That is, when you apply a fresh regulator, its ball should ideally mate with the same target pad. You may be lucky here since the entire vertical row is common bussed. Most likely the same on the actual part itself so you may not even need for these 2 balls to be connected. Best if you do but should work, in theory as-is with a fresh part.
This event most...Leave a comment:
-
Is a 95W or higher power adapter being used to power this unit?Leave a comment:
-
Have you tested with another known good battery?Leave a comment:
-
L6995 is an inductor / coil and therefore it starts with the 'L' prefix to identify this part.
If resistor, the prefix will be 'R' and a capacitor will be 'C'. For ICs (integrated circuits), often the prefix is 'U'.
The resistance to ground of the inductor @ L6995 is ~133R ohms which is a bit low but for now do not worry about this. We can investigate if the power rail is ok and stable once you receive the replacement parts.Leave a comment:
-
Not clear of these measurements.
Use the lowest resistance scale of your meter, place one probe on L6995 and other probe to ground. Metal contact of the usb connector will be ground.
What is the measurement in ohms?
Post a pic of the meter face for a review.
When testing in diode mode, the measurements are in volts. So it would be 0.235 volts for your previously measurement of the diode.Leave a comment:
-
If you have any resistor value of 50R ohms or lower, you can replace the missing R6920 to complete the circuit. In general, not recommended but you could even bypass this resistor with a short circuit. Ideally want to have a resistor in place to limit the in-rush currents. When all is well, the power adapter voltage of 16-19v should appear at the output of the dual diode and this in turn should power the regulator (U6990) and offer a stable 3v42 power rail to kick-start the motherboard.
Confirm that the 3v42 rail @ L6995 to ground is not shorted. Remove all power. Measure the resistance...Leave a comment:
-
The resistor value is not critical but ideally should be close to the original value of 47R ohms. The physical size is 0805 smd size. First measure the resistance to ground of the output of the dual diode and also confirm the dual diode is not defective. If required, you may need to purchase the resistor + dual diode + missing capacitor from Aliexpress or a nearby vendor. Digikey is common to most customers but if not in a rush, Aliexpress is inexpensive but will take possibly a few weeks for the parts to arrive.
Start with confirming that there is no short on this key power rail....Leave a comment:
-
No.
1) Do not take it to this service center again. They are idiots.
2) R6920 is a mandatory resistor that feeds the D6905 dual diode with the power adapter rail. With this resistor missing, the critical PP3V42_G3H_REG cannot be created.
3) C6992 = 4.7uF 0603 @ 25v or higher capacitor. This part should be replaced as well. Start with no power to the board, meter in resistance mode. Measure the resistance to ground of pin # 3 of the dual diode @ D6905. We are testing the resistance at the output of this dual diode which is the same leg...Last edited by mon2; 11-09-2025, 11:43 AM.Leave a comment:
-
Share the voltage to ground of ppbus_g3h.
Is this voltage stable?Leave a comment:
-
It *may* be this one but datasheet does not match the markings 100%
I just found this on AliExpress: US $4.49 | (10piece)100％ New G517F1T12U G517F1T12 5AFBW 5AF.. sot23-5
https://a.aliexpress.com/_mq6YByhLeave a comment:
No activity results to display
Leave a comment: