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Search: Posts Made By: Zentech
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-14-2021, 07:45 AM
Replies: 25
Views: 1,203
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-11-2021, 05:32 PM
Replies: 25
Views: 1,203
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-11-2021, 09:55 AM
Replies: 25
Views: 1,203
Posted By Zentech
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....
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-11-2021, 07:47 AM
Replies: 25
Views: 1,203
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-10-2021, 07:54 AM
Replies: 25
Views: 1,203
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-09-2021, 09:24 AM
Replies: 25
Views: 1,203
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-02-2021, 04:09 PM
Replies: 25
Views: 1,203
Posted By Zentech
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)
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-02-2021, 07:16 AM
Replies: 25
Views: 1,203
Posted By Zentech
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?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-01-2021, 08:08 AM
Replies: 25
Views: 1,203
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-30-2021, 10:55 AM
Replies: 25
Views: 1,203
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-29-2021, 11:41 AM
Replies: 25
Views: 1,203
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-28-2021, 12:05 PM
Replies: 25
Views: 1,203
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-27-2021, 05:45 PM
Replies: 25
Views: 1,203
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-27-2021, 11:39 AM
Replies: 25
Views: 1,203
Posted By Zentech
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. ...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-20-2021, 10:36 AM
Replies: 5
Views: 517
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-20-2021, 07:50 AM
Replies: 5
Views: 517
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-19-2021, 01:58 PM
Replies: 6
Views: 390
Posted By Zentech
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-16-2021, 07:13 AM
Replies: 6
Views: 390
Posted By Zentech
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-15-2021, 06:55 PM
Replies: 6
Views: 390
Posted By Zentech
What kind of Screws on The Bottom Cover HP Elitebook 840 g3

I got an HP Elitebook 840 G3 that doesn't have any screws on the bottom cover, so I need those. I downloaded the service manual and it shows these crews here 10 Phillips PM2.5x5.0 on Page 45. But...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-12-2021, 09:18 AM
Replies: 1
Views: 199
Posted By Zentech
MiniPro or XGecu Pro Bios Programmer

Guys, I need to program a BIOS chip, but every video I've seen online uses either MiniPro or Xgecu programmer. So they're both about the same price online. And the reviews on the product are pretty...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-08-2021, 01:52 PM
Replies: 1
Views: 6,926
Posted By Zentech
How to Learn to Fix Mobile Phones

I am fairly comfortable fixing laptop's motherboards and other electronics. But never venture into phone/tablet repair. So what is the best way to learn to fix phone and tablets? of course, besides...
Forum: BIOS Requests ONLY! 07-03-2021, 06:58 AM
Replies: 13
Views: 351
Posted By Zentech
Re: Where's the BIOS on HP EliteBook G3 840

thanks for pointing this out. I was definitely not aware of it. I thought the middle pad was just another ground connection. Could you point to a website that has wson8 adapter?.... mean while I'm...
Forum: BIOS Requests ONLY! 07-02-2021, 02:51 PM
Replies: 13
Views: 351
Posted By Zentech
Re: Where's the BIOS on HP EliteBook G3 840

yes, there was contact between the pad, which I think is ground, and pin 5, I removed it with a solder... I don't know what tape you refer to... you mean a tape to eliminate solder pins? are you...
Forum: BIOS Requests ONLY! 07-01-2021, 03:17 PM
Replies: 13
Views: 351
Posted By Zentech
Re: Where's the BIOS on HP EliteBook G3 840

that one do not work with CH341a?... needs to be another hardware?? correct
Forum: BIOS Requests ONLY! 07-01-2021, 03:10 PM
Replies: 13
Views: 351
Posted By Zentech
Re: Where's the BIOS on HP EliteBook G3 840

I checked continuity with the meter from pin 1 to pin 1 on the connector, 2 with 2 and so on... it seems ok...
but neither neoprogrammer or asprogrammer recognized the chip..
Showing results 1 to 25 of 91

 
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