Dear colleagues,
I've entered the repair of the chromebook machines just one month ago and I've found some significant differences from the classic laptops or macbooks, so I'm searching some advices.
The owner of this chromebook gave it to me after it has been left flooded by water for almost a week, so chances of repair were not so high, the mainboard was oxidyzed in many spots but I made a nice cleaning, resoldering and component replaging work and now it is almost working.
Among other things I've cleaned many spots from oxyds, reballed CPU, EMMC, EC, replaced...
modtool
Senior Member
Last Activity: 06-03-2025, 08:31 PM
Joined: 07-02-2015
Location: Florence
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HP x360 Chromebook 14A-CA, DA00GIMB6H0 REV:H, flooded, restored, slow and stuck in tablet mode
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Hello kike1234, it's really a good news that you solved the problem with a reflow of the CPU!
One year ago I heated both CPU and GPU to test if it could be a cold solder joint under them but the board didn't gave any better results, I will try to reach for that machine and reflow the CPU and hopefully we could mark as solve this mistery, thanks -
Hi kike1234, one year ago I didn't find any solution and gave back the laptop to the owner...but still I'm curious about the problem, if someon has other suggestions, you could try them on your machineLeave a comment:
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Yes, I've already done what you said, I've unsoldered the shorted DrMOS, gave tension to the mb and it seems to work, every (but VGFX) voltage rise but capslock blinks as 5 long + 3 short, and no video output.
Thank you for your support and suggestions [USER="149220"]mcplslg123[/USER]mcplslg123Leave a comment:
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Thank you [USER="149220"]mcplslg123[/USER] for your advice.
I didn't even mention resistances measures on the main coils, but I got (diode voltage drop mode) :
71.4 CPU Core
40.9 VGFX
276 VCCSA
96.4 RAM
2.2 VGA CORE
45.8 VRAM
381 +5V
372 +3V
504 VBAT
As you can see, Cpu Core doesn't seem to be shorted from static measures...do you think that it could have had a malfunction even if it's not completely shorted?mcplslg123Leave a comment:
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HP Victus 15-FA1025NL , board DAG3PAMB8D0 REV:D, shorted CPU DrMOS and n-mos
Hi to all,
the owner of this machine gave it to me after having opened it to take off the dust from the inside, telling me that after that it didn't start anymore.
I found that one of the DrMOS (AOZ5016QI) on the CPUCORE was shorted between VIN and VSWH, and that one of the two n-mos connected to the power jack was shorted aswell.
I unsoldered the two shorted components and verified that there were no other short circuits, then decided to power the mainboard, firstly with the lab power supply, then with its original HP 200w charger, but the behaviour is the same, the board starts... -
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Hope they help you
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"Image01_1.jpg","data-attachmentid":3605632}[/ATTACH]...Leave a comment:
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Hi,
after many days I've back up the ssd and made firstly a Revive then a Restore of all the system , the operations completed successfully without errors but still the display doesn't come on...
Connecting to an external hdmi monitor, graphic is clear, no problems or glitches, and still in general settings I can see both monitors connected to the system, the external tv and the internal Liquid Retina XDR.
When I close the lid, in general settings internal display fades out and the external tv is still there.
Strangely, I'v disconnected the three flat cables that go to...Leave a comment:
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No, the external display is not affected in any way byt the closing of the lid assembly. both if the sensor is connected and if it is disconnected, the external display remains always on.
Do you think that a revive in DFU mode could lead to a solution?Leave a comment:
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Macbook Pro 14 2021 - A2442 - 820-02098-A - Internal display not turning on but MacOS working good
Dear collegues,
the owner of this machine brought it to me saying that suddenly one day the display didn't turn on anymore, he tought that all the machine was damaged but it turned out that the MacOS starts good and stays on, and that connecting it to an external display it works without problems.
If you take a look into general settings, you can also see that the internal retina display is recognized as connected by the main board but for an unknown reason it doesn't turn it on.
I've tried to put a bright light towards the screen but I can't see anything, any shadows or apple... -
Hello, I'm sorry to revive an old thread, can anyone have any suggestion?Leave a comment:
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Hi to all,
I've received a new bios IC, I bought a Winbond W25Q128JWSIQ (as seen in the datasheet of this board), wrote into it both the same binary extracted from the Gigadevice IC and a new freash untouched FSCN14WW (same version as the one installed originally), but the problem is not solved
The error "BIInitializeLibrary failed 0xc0000185" shows up everytime I try to boot some disk (nvme or usb), and the display stays empty (but keyboard work and I can reboot by crtl+alt+can) when I try to go into BIOS settings through F2 or the Novo button.
Since I've...Leave a comment:
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Hi [USER="237374"]SMDFlea[/USER],
thank you for your suggestion, I've already tried other SSDs, HDDS , even empty ones and that error shows up every time, even if I try to boot a USB installation disk with Win10 or Win11.
When there's no disk in any port, in place of that error the system shows "Checking media", then goes to the LAN request window for two times, and after it shows "No boot media found" window.
The suspecting thing is that I can't even enter the bios settings, when I try F2 or the Novo button, it goes to a black screen with the mouse...Leave a comment:
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Hi [USER="149220"]mcplslg123[/USER]
thank you for your advice.
I've used the 1,8v adapter on the CH341A programmer, but sadly I don't have any SVOD or similar programmers to flash the internal eeprom inside the IT8227E-192EC, that's why I tried to start the Crisis procedure that I think can flash the same EC during the whole process automation.
I've searched for an "FD" reference inside the bios binary but I didn't find any...
If I upload the file, can someone take a look inside it in order to find the Crisis filename?mcplslg123Leave a comment:
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Lenovo Legion 5 15ARH05H, NM-D281 Rev 1.0, "BIInitializeLibrary failed 0xc0000185" and bios freezing
Dear members,
I have a problem with this machine that still I can't solve, I hope some of you can suggest me something.
I was the first one to open the machine and touch the mainboard, in fact the Lenovo seal was intact the first time that I unscrewed all the internal screws.
The ower told me that it was working very good until Windows kicked "something like a firmware update" (owner's words) then the system started acting weird.
When you try to start it, some seconds after having pressed the power button, Lenovo splashscreen appears, then after 1 second, in the... -
Re: Macbook Pro A1989 fallen, reboots if touchbar connected
Hi Stephen,
thank you for the hints, a new touch bar arrived, I installed it and everything has gone well, no more reboots and who knows what other problems it could have caused in future MacOS updates.
Have a nice day
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Macbook Pro A1989 fallen, reboots if touchbar connected
Hi to all,
the owner of this macbook brought it to me after a fall, that hit the upper right corner of the top case.
Luckily enough, the screen and all other parts of the machine haven't been damaged, only the touch bar wasn't lighting up anymore, and the macbook began to behave strangely, because it seems to start and work fine but suddendly it shutsdown (and at the same time the fans make a high rotation for half a second, as if an animal was annoyed by something...) at random times, sometimes after 2 minutes, sometimes after 5 minutes, but never over 10 minutes, then restarts... -
Re: Sony PS4 slim CUH-2216A power supply ADP-160FR not working after short in PFC
Hi theManieq, sorry for this late reply but thank you for your help and will to measure !
It's very useful to know that 12v from Q41 isn't present in standby, this changes my point of view about the "power sequence" of this power supply .
I have a chance to test the ps4 with a compatible power supply, i.e. the N17-160P1A , the console works correctly so it must be a problem within the ADP-160FR itself.
The two power supplies have different components...Leave a comment:
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Re: HP EliteOne 27" 1000 G2 - Shorted USB - MainBoard DAN11AMB8H0 REV:H
Hello,
no sugestion about anything?
I know that this machine is not so widespread, but maybe someone can reach some datasheet or boardview?
Do you know if the absence of the Thunderbolt controller JHL7340 and its firmware chip may block the power sequence?Leave a comment:
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