guys, I have a laptop hp chromebook 14 and the operating system was not recognizing the battery. I opened and tested the battery connector to the motherboard for output. I found like three different voltages must of them 3.3V. Then I looked online for voltage of motherboard to battery in HP laptops and found the pinout of the connector. Needless to say I was surprise to see that the laptop doesn't charge the battery with 12v. I tested with the meter and it was like 3.3V in three different pins and two of them were ground. Then I search for articles on how to test battery and found this
...
Zentech
Senior Member
Last Activity: 11-20-2022, 04:17 PM
Joined: 02-24-2021
Location: Florida
-
How to Test if Laptop is Charging The Battery
-
Unable to Write Bios File to SOCIC 25Q128FVPQ Chip
bios chip: 25Q128FVPQ
MB SN: 6050A2822301-MB-A01
when I first got this laptop the bios was locked, I unsoldered and unlocked the bios. the problem is that I lifted a couple of pads from the MB. So I couldn't use the WSON chip that comes with the board, so I got an equivalent bios chip SOCIC 8pin. The problem is that I'm trying to write the file (original) to the chip and it will not program it. I'm using NeoProgrammer.
Here's the error
[CODE]Current programmer: CH341
15:29:00
Programming memory(verifying)...
Verification error on address: 00133000... -
Need Digital Microscope Software (free)
I had a very simple software to view my digital microscope, the app name started with XP or PX then a number like PX5602 something like that. Anyway, I purchase another microscope and I installed the software that comes with it, and it uninstalled my previews app. I can't find it anywhere on my computer. I even looked in the registry to see if I can see its name and no luck. The new microscope software is bloated with buttons and I don't like the interface. Is there anyone who my have the link to the software? it has a white and very simple interface design.
I have installed Xploview which... -
Has Anyone Unlock HP Elitebook 840 Successfully
Since I unlocked an HP Elitebook 840 G3 which I bought on ebay, the laptop is behaving weird. I dumped the original bios file back into the bios, but now is not booting to bios screen. I have the 19V led on, and power button led also on, I have 3, and 5V, but when I press the power button nothing happens. I notice I have 2.3V on power button. That seems also weird since it should be 3.3V. I press power button and it goes to 0V but board does not come on. After I unlocked the bios, the board came on and I was able to get into the bios... -
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
ok... I manage to dump the bios file into a winbond 25Q128FV bios, solder on the board now I got power. 19V led comes on the fan comes on, the 12V for the charger are present; however, when pressing the power button boards does not come on. I don't get anything on the screen.
I took a pic of how the pads for bios connection are after I switch to isoc8 type of bios. How can I know if the pads are making a good connection and the pads on the board are not bad? check out the pics attached...Leave a comment:
-
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
is there a clip out there for programming the bios on board, without removing it. this boards are so delicate that you risk damaging the rails. I have one but is a pain in the butt to get it to work.
[url]https://www.amazon.com/AiTrip-EEPROM-CH341A-Programmer-Module/dp/B07V6WLF4S[/url]
is there something like a pogo click that sits on top of the chip? If anyone can provide link.. much appreciatedRe: Unable to Locate Power Supply Ch...br /> is there...Last edited by SMDFlea; 08-11-2021, 10:39 AM.Leave a comment:
-
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
ok. I desolder the BIOS chip and noticed that the contact under the chip (wson pin layout) was damaged during the initial unlocking of the bios. It seemed ok when I solder it back. Is there a way to convert the pin layout of the motherboard bios from wson to isoc and use an equibalent isoc bios chip with same storage? can I just use an isoc type of bios dump the bios file and solder on the board?Leave a comment:
-
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
thanks buddy.. I though it was 747805..
One thing I'm confuse with this board is that in past boards, the charger ic, also provides 3, 5V PVC (REGV) so as soon as you plug in the charger, the ic VREG pin gives you 3, 5V to power on the board. Not in this case... apparently the 3, 5V power supply is separate. How do you find that ic without schematic? VREG is not 3VALW which you can measure at the coil and it is present once the I/O IC starts the board. Some boards are different than other in that sense....Leave a comment:
-
charger IC For HP Elitebook 840 G3
guys, I need to the serial number on an chip on my motherboard. don't have the schematic and chip serial number seems worn out. This is for HP Elitebook 840 G3
Motherboard S/N 6050A2822301-MB-A01
I manage to get the schematic for previous version of laptop, but numbers don't match on the board.
it is U6000, which is near the charger. I took a picture to search for the chip data sheet, but it is not possible to see clearly....Leave a comment:
-
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
I don't see a light when charger is connected. Here are more pictures requested of power supply L6000 (both sides)...Leave a comment:
-
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
what attitude?... you just join the forum on 2020. are you looking for newbies to bash?...Last edited by SMDFlea; 08-02-2021, 07:41 AM.Leave a comment:
-
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
the voltage value for every coil / power supply are above along with their resistance. I also posted pictures. If you zoom in into the pics you can clearly see the coils and numbers. All those voltages are S5 stage (power off with charger connected). L6000 is the first power supply close to the charger. I don't think is for 19V or even if it is suppose to have any voltage at S5 (power off) Because even if it getting 19V on drain, is not going to conduct to source if not polarized on gate (so it is important...Last edited by Zentech; 08-01-2021, 08:15 AM.Leave a comment:
-
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
ok. I made a video, which I think is easier for you to see what I'm doing.
I was able to trace 19V to Q6000 which part of the same Power Supply as L6000. I have 19V coming in but no voltage on gate and of course no voltage on source which I believe is connected to the other mosfet Q60001.
what should I do next? should I check the driver for this mosfet to see why no voltage on gate or try replace mosfet. By the way is this L6000 part of main power rail 19V?
[url]https://youtu.b...Leave a comment:
-
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
guys, has anyone been able to revise my readings? does a beep on the coil means a short... and why is it beeping if I get readings of 5ohms? Finally, how to find a short on a board this big. Can I inject voltage with a power supply? can I do that at one end of the coil and see what gets hot?
any help appreciatedLeave a comment:
-
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
here are my readings (pictures attached if you zoom in you can see the number for each coil) if not let me know I have pictures with microscope.
L60000 = 40k
L60300 = 177 ohms
L63320 = 5 and BEEPS
L66310 = 5 ohms BEEPS
L60500 = 60 ohms
L60200 = 19k
L60100 = 038.7k
L66010 = 5 ohms BEEPS
L66610 = 15 OHMS (BEEPS)
l60800 = 33 OHMS
l60600 = 25K
L60000 = 173 mv
L60300 = 0
L63320 = 0
L66310 = 0
L60500 = 0
L60200 = 5v...Leave a comment:
-
Re: Unable to Locate Power Supply Chip on HP Elitebook 840 G3
I know that info... the problem is that the diagram is for HP Elitebook 840 G2 and my laptop is G3. One generation after. I have not being able to find this schematic. So basically I'm guessing at this point....Leave a comment:
-
Unable to Locate Power Supply Chip on HP Elitebook 840 G3
I have an HP Elitebook 840 G3, which is not powering on. So I follow troubleshooting steps by verifying voltage.
19V are present on the board.
I have 2.3V at power button. I think it should be 3V.
According to the schematic that power should come from power supply
3 and 5V on page 8. (3 VREG OF U6100)
The problem is that I can't find U6100 on the board. I don't have boardview and the schematic is of elitebook 840 G2.
could someone suggest what to do next?
Motherboard SN: 6050A2822301-MB-A01
[url]https://drive.google.com/file/d/1-3XhHWP... -
Re: HP Elitebook 840 G3 Caps and Power Button Blinking Doesn't Power On
I just started troubleshooting the board and I noticed when I press the power button the 3.3 volts do not go to ground at the connector... I circled the power button on the picture. can someone verify that is the correct power button connector?...Leave a comment:
-
HP Elitebook 840 G3 Caps and Power Button Blinking Doesn't Power On
After installing new battery and a 265gb nvme pcie hard drive for my laptop, I notice the laptop came on to BIOS detecting the drive and battery, after I power off the laptop, it got caught up in a boot loop, where as soon I plug the charger it will boot up (turn on fan and keyboard will light up) and then off. I remove the battery and hard drive, then connected the charger and continued to bootloop. I did a power reset by holding down power button for 20sec, didn't fix it, I hold power button for 1min. Then plug charger, and it will not power on or bootloop, now the caps key and power button... -
what kind of screws securing the battery hp elitebook 840 g3
I have an hp elitebook 840 g3 that came without screws and it was missing the battery. So I got the replacement battery but the "service manual doesn't specify what kind of screws are. I watched a video online that says to remove p1 screws, but it doesn't says the measurement of those screws. If anyone knows thanksLeave a comment:
No activity results to display
Leave a comment: