today I received MacBook Air [B][URL="https://www.youtube.com/watch?v=gnU5UAdoOZg"]A2681 M2[/URL] for repair. The MacBook is working have a startup sound and charging sound but no video on the screen I checked the backlight voltage which is
No content found
Please log in to your account to view your subscribed posts.
| Directory | Topics | Posts | Last Post | |||
|---|---|---|---|---|---|---|
| Badcaps Capacitor & Electronics Repair Forum | ||||||
|
Frequently Asked Questions (No Posting)
All new members, PLEASE READ HERE FIRST! Posting only allowed by established members.
Topics: 45
Posts: 733
|
45 | 733 |
|
|||
|
Announcements & Related News
Site announcements, capacitor-related news, and anything relavant you might think of... Got News? POST IT!!
Topics: 235
Posts: 42,011
|
235 | 42,011 |
|
|||
| Document & Software Archive | ||||||
|
Common Parts Library - Datasheets
Share or download datasheets or application notes for electronic components and other parts. Contribute your knowledge or ask questions. Before using please read our Terms of Service.
Topics: 1
Posts: 4
Last Post:
ncp81208 datasheet
|
1 | 4 |
|
|||
| General Topics | ||||||
|
General Capacitor Questions & Issues
Questions and answers for identifying whether your device has bad capacitors. Also post general capacitor-related questions and issues here.
Topics: 3,190
Posts: 32,707
Last Post:
Remove capacitor without damaging the board
|
3,190 | 32,707 |
|
|||
|
General Computer & Tech Discussion
Have just a general computer question, post it here. This can be anything from an OS issue, hardware issue not related to capacitors, upgrade question, or whatever basic tech-related issue is on your mind.... This is also a good place to share your tech projects!
Topics: 4,498
Posts: 74,847
|
4,498 | 74,847 |
|
|||
| Troubleshooting Hardware & Devices and Electronics Theory | ||||||
|
General Electronics Technical Discussion
If you have a general question concerning basic electronics theory or component function & usage, here's where it goes.
Topics: 3,978
Posts: 44,376
|
3,978 | 44,376 | ||||
|
Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals
Technical discussions covering any type of desktop motherboard, video/graphics card, controller card, or whatever other desktop peripheral you need help with. Any and all brands and models welcome. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
Topics: 6,836
Posts: 37,386
|
6,836 | 37,386 |
|
|||
|
Sub-Forums:
| ||||||
|
Troubleshooting & Designing Networks
Post your computer network questions, ideas, gripes, and so on in here. This can be any type of network, whether its cabled, wireless, or whatever. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
Topics: 501
Posts: 5,451
|
501 | 5,451 |
|
|||
|
Troubleshooting Laptops, Tablets, and Mobile Devices
Technical discussions covering any type of laptop, notebook, netbook, tablet, or smartphone. Any and all brands and models welcome. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
Topics: 31,970
Posts: 305,206
|
31,970 | 305,206 |
|
|||
|
Sub-Forums:
| ||||||
|
Troubleshooting Computer Displays
Technical discussions covering any type of PC/computer display, whether it be CRT, LCD, or anything else. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
Topics: 5,324
Posts: 75,715
Last Post:
Componant identification
|
5,324 | 75,715 |
|
|||
|
Troubleshooting TVs and Video Sources
Technical questions about your defective television, projection screen, LCD/plasma, or any other type of video device. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
Topics: 27,461
Posts: 374,867
|
27,461 | 374,867 |
|
|||
|
Troubleshooting Power Supplies and Power Supply Design
Technical discussion for power supplies. This covers PC supplies, and any other related power supply issue. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
Topics: 4,183
Posts: 65,246
Last Post:
ASUS ROG THOR 1200W PLATINUM PSU
|
4,183 | 65,246 |
|
|||
|
Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices
Technical questions about your defective laser or ink printer, plotter, copier, scanner, and other imaging & printing devices. This section also includes digital cameras. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
Topics: 302
Posts: 1,669
Last Post:
Pantum P2502W Toner Reset Chip help
|
302 | 1,669 |
|
|||
|
Troubleshooting Audio Equipment
Technical discussion on audio equipment troubleshooting and installation. This can be anything from a home/car stereo, guitar amp, and so on. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
Topics: 2,327
Posts: 27,503
|
2,327 | 27,503 |
|
|||
|
Troubleshooting Appliances and other Household Electronic Stuff
Technical discussion on household appliances & other household electrics & electronics; including troubleshooting and installation. This can be anything from a washer/dryer, dishwasher, microwave oven, other sordid kitchen electrics and so on. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
Topics: 224
Posts: 3,914
Last Post:
Saeco SG200E Coffee Machine
|
224 | 3,914 |
|
|||
|
Troubleshooting Game Consoles & Other Weird Devices
This can be anything from game consoles to arcade games to anything else that doesn't really fit into any of the above categories. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
Topics: 1,003
Posts: 10,882
|
1,003 | 10,882 |
by James Boden
Yesterday, 02:16 PM
|
|||
|
Equipment Usage, Soldering, Techniques, and Reviews
Technical discussions concerning soldering techniques, usage of test equipment, how it works, what's best, and some pointers in using it all.
Topics: 1,380
Posts: 19,421
|
1,380 | 19,421 |
|
|||
-
today I received MacBook Air [B][URL="https://www.youtube.com/watch?v=gnU5UAdoOZg"]A2681 M2[/URL] for repair. The MacBook is working have a startup sound and charging sound but no video on the screen I checked the backlight voltage which is 0V then I checked the backlight ic enable there is 0V on anyone please help me.[/B]
today I received MacBook Air [B][URL="https://www.youtube.com/watch?v=gnU5UAdoOZg"]A2681 M2[/URL] for repair. The MacBook is working have a startup sound and charging sound but no video on the screen I checked the backlight voltage which is04-30-2024, 04:18 AM -
Hello, gentlmen!!!
My HP Probook 430 g2 does not detect battery. I tested the battery on another laptop and it is OK.
I believe smth is wrong with my PC ((.
Searching this forum I found some nice suggestions.
So, I tested Battery Connector pins (charger in/battery out) and here are my results:
pin_1 0v (-)
pin_2 3.30v
pin_3 0v
pin_4 3.38v (SCL)
[B]pin_5 2.55v (SDA)!!![/B]
pin_6 2.25 (+)
As far as I understand SDA pin must be ~3.3v???
Are there any other tests I can do before disassembling motherboard?
I...Today, 05:22 AM -
This battery PCB is new but was put in not its original charger, and now the battery won't charge.
First of all BMS chip is without a name. It is 20 pins but no marking.
On this board, I can't understand where B- the line is connected to the board.
Any suggestions about the BMS Chip and other things to look for?...Today, 11:30 AM -
I have an old Mikrotik board with one bulging capacitor. It still works, but the cap doesn't look healthy.
I have tried replacing it, however it seems to ignore my soldering iron like it's a toothpick. I do suspect an industrial-strength lead used during manufacturing.
How do I remove it without damaging the PCB and (more importantly) surrounding components which might be more temperature-sensitive.Today, 11:25 AM -
Hello everyone,
I have a problem with my Acer predator XB241YU screen. When I plug it in, the startup LED turns on instantly, and I can't turn off the screen without unplugging it.
After disassembly and inspection of the electronic cards I found what looks like a broken inductor, it is marked with the letter A and is at location L58.
In the first photo you can see the broken component, in the second photo you can see where it is on the board, in the third photo you can see the silkscreen and in the fourth photo you can see the identification sticker of the main board
I...Today, 11:06 AM -
Hi there,
I am looking for help with my broken 980ti. Had a bad DrMos (the bottom one) and replaced it, card worked for a short moment, but I got another shortes DrMos (second one) and replaced that one aswell.
Now I don't measure any shorts, I have 12v, PEX, 5v, 3.3v all working fine (probing points on card), but I can't get any voltage at FBVDDQ or NVVDD probing points.
Where could I check to find the fault?
You think my first DrMos could be bad, because I read that the first one will activate core?
Don't want to replace that one when I can just test other...Today, 10:41 AM -
Picked up a used MSI Ventus 1660 super with no video output for $50 to dip my toes into GPU repair. After some lurking around here, google searches, and youtube videos, I've gotten around to checking resistances, and checking for the base and minor rails. On first inspection, I didn't any shorts on any rails, so I powered up the card, and found the 5v, 12v, 5v, 1.8v, and Vcore(I hadnt found the 3.3v location at the time). Later, after finding the 3.3v, I got a pcie extension and powered up again. This time I found the 12v. 5v, 3.3v, 1.8v, Vcore, and Vmem. Later, when I wanted to doublecheck my...Today, 10:14 AM
-
Hi, I have this laptop, it is completely dead, no charging light when connected to a working charger.
Can anyone help me with some hints for troubleshooting this laptop?
Thanks in advance...05-07-2024, 05:28 AM -
Hello,
Will be possible to just read bios password?
My problem is, that a have put to this locked machine new ssw with preinstalled win and now is this ssd locked too
CF-D1AV312QW
SN: 4ETCA37953...Today, 05:39 AM -
Hello friends, today i got an A2485 820-02100-A in a desd state, found visual short on PPVIN_5VUSBC23 line, removed tantalum capacitor, installed same same value from other donor board, now there is no short on any of the rails but when i plug either magsafe3 or usbc inget 5v stable with 0.00 amps drown, no cycle, just these steady values, board is not in dfu mode, checked with magsafe and with usbc. Only value that i find on the board is ppdcin_aon which is 5v… i dont get 3,3 aon, 3v8 aon .. all missing, where should i start looking please !...Yesterday, 09:40 AM
-
Hello, gentlmen!!!
My HP Probook 430 g2 does not detect battery. I tested the battery on another laptop and it is OK.
I believe smth is wrong with my PC ((.
Searching this forum I found some nice suggestions.
So, I tested Battery Connector pins (charger in/battery out) and here are my results:
pin_1 0v (-)
pin_2 3.30v
pin_3 0v
pin_4 3.38v (SCL)
[B]pin_5 2.55v (SDA)!!![/B]
pin_6 2.25 (+)
As far as I understand SDA pin must be ~3.3v???
Are there any other tests I can do before disassembling motherboard?
I...Today, 05:22 AM -
I have this Sony MBX-273 on my hand. 19V present but no Voltage on 3.3, 5V Coils.
It has a [B]SN608098 [/B]Chip. When I check its pins It shows;
19V on pin 6(VIN)
5.3V on pin 4(EN_LDO)
3.4V on pin 5(VREF3)
1.3V on pin 1(VREF2)
But only 0.46V on pin 7(LDO)
Is this means Chip is gone?
I have this Sony MBX-273 on my hand. 19V present but no Voltage on 3.3, 5V Coils.
It has a [B]SN608098 [/B]Chip. When I check its pins It shows;
19V on pin 6(VIN)
5.3V on pin 4(EN_LDO)
3.4V on pin 5(VREF3)Today, 03:20 AM -
Hello friends, today i got an A2485 820-02100-A in a desd state, found visual short on PPVIN_5VUSBC23 line, removed tantalum capacitor, installed same same value from other donor board, now there is no short on any of the rails but when i plug either magsafe3 or usbc inget 5v stable with 0.00 amps drown, no cycle, just these steady values, board is not in dfu mode, checked with magsafe and with usbc. Only value that i find on the board is ppdcin_aon which is 5v… i dont get 3,3 aon, 3v8 aon .. all missing, where should i start looking please !...Yesterday, 09:40 AM
-
This battery PCB is new but was put in not its original charger, and now the battery won't charge.
First of all BMS chip is without a name. It is 20 pins but no marking.
On this board, I can't understand where B- the line is connected to the board.
Any suggestions about the BMS Chip and other things to look for?...Today, 11:30 AM -
I have an old Mikrotik board with one bulging capacitor. It still works, but the cap doesn't look healthy.
I have tried replacing it, however it seems to ignore my soldering iron like it's a toothpick. I do suspect an industrial-strength lead used during manufacturing.
How do I remove it without damaging the PCB and (more importantly) surrounding components which might be more temperature-sensitive.Today, 11:25 AM -
Hello everyone,
I have a problem with my Acer predator XB241YU screen. When I plug it in, the startup LED turns on instantly, and I can't turn off the screen without unplugging it.
After disassembly and inspection of the electronic cards I found what looks like a broken inductor, it is marked with the letter A and is at location L58.
In the first photo you can see the broken component, in the second photo you can see where it is on the board, in the third photo you can see the silkscreen and in the fourth photo you can see the identification sticker of the main board
I...Today, 11:06 AM -
Hi there,
I am looking for help with my broken 980ti. Had a bad DrMos (the bottom one) and replaced it, card worked for a short moment, but I got another shortes DrMos (second one) and replaced that one aswell.
Now I don't measure any shorts, I have 12v, PEX, 5v, 3.3v all working fine (probing points on card), but I can't get any voltage at FBVDDQ or NVVDD probing points.
Where could I check to find the fault?
You think my first DrMos could be bad, because I read that the first one will activate core?
Don't want to replace that one when I can just test other...Today, 10:41 AM -
Picked up a used MSI Ventus 1660 super with no video output for $50 to dip my toes into GPU repair. After some lurking around here, google searches, and youtube videos, I've gotten around to checking resistances, and checking for the base and minor rails. On first inspection, I didn't any shorts on any rails, so I powered up the card, and found the 5v, 12v, 5v, 1.8v, and Vcore(I hadnt found the 3.3v location at the time). Later, after finding the 3.3v, I got a pcie extension and powered up again. This time I found the 12v. 5v, 3.3v, 1.8v, Vcore, and Vmem. Later, when I wanted to doublecheck my...Today, 10:14 AM
-
Hey all,
So I bought a second hand Powercolor Hellhound Spectral white 6700 XT a while back. The only problem with it is that the LED switch on the PCB is broken. Anyone have a PN I can use to solder in a a replacement? Also, a Boardview or schematic would be good too. ThanksToday, 09:38 AM -
Got this projector which has a problem with a lack of blue. Menu text is very yellow... expecting white. If I input a signal from a test disc via hdmi, a red screen image shows a uniform red as expect. Green similar while the blue does show but with non-uniformity. Looked at the in-polarizers. They are all good and clean. Running the projector to expose the light area in the prism block, shows each color well represented, all looking about the same intensity from the naked eye. Looking at the prism block itself and sending a light source back into the "out port", the individual...Yesterday, 06:49 PM