i have a power supply board out of a Compaq lcd and it has what i think is a ceramic smd capacitor with the markings of 7.5 B or 8 2u any ideal what they mean or what size it is it looks like it got really hot most of the electrolytic caps are bad vented it works intermediately here are a couple of pics of the board not very good quality though
-
-
Re: need help
I'm sorry, but your pictures are not good enough.
They're not focused at all.
I can make out a scorch mark, that's all.
Please attach them as per this thread:https://www.badcaps.net/forum/showthread.php?t=1868 -
Re: need help
It looks like you got some nice burn marks on that board. Too bad the pics are fuzzy. The only thing I can instruct you to do right now is to check solder joints near the burn marks and try to find out which component made it burn this bad. My gut tells me that a surface mount cap cant heat up this much. Please take better, clearer pictures of the boards and re-post using the "MANAGE ATTACHMENTS" on the posting page. No inline pictures.The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS
Comment
-
Re: need help
see if your camera has a macro function, if not then hold a magnifier infront of the camera lense - it works really well on cellfones!Comment
-
Re: need help
here are a couple of pics of what i think is a smd ceramic cap this is what is on the under side of the board were the scorch mark is i tried to get in as close as i could magnifying glass ideal worked
Attached FilesComment
-
-
Re: need help
From the labels, it looks like the burned component was ZD984, which would be a zener diode. The component looks polarized, because it has a band on one side. The 7.5 could be the zener voltage, and the B could be the tolerance code. Look at the bad solder joint directly to the left of the burned component. If you don't have a service manual, it might be worth tracing out the surrounding circuitry to try and understand it and discover what the root failure was.Comment
-
Greetings everyone,
I have a HANNSG Hi221 monitor that exhibits two seconds to black issues (backlight goes off, display is still on as confirmed by shining a flashlight on it) with some additional oddities...
The monitor failed on me with a standard "2 seconds to black" some time ago prompting me to initially replace most of the electrolytic capacitors (some of them were bulging/leaking).
Things kinda sorta worked for a night, then the problem returned along with some flickering and "buzzing" noises.
Upon closer inspection... -
Eventually discovered a burn mark near lower corner of LCD. Here is a summary- Backlight on, no image
- Disconnect right buffer board (view from front), left side display comes on
- Masked off pin 7+8 (both ~12,5v on both left and right buffer board) from t-con to right buffer board (view from front) display works but have some lines
- Buffer board is pretty simple
07-11-2025, 04:04 PM -
Hello. Have this Dell G15 5511 la-k455p that new gpu fan burn and left pwm sig from sio with 10 ohms.
I read that this sio MEC1515 must be programmed, but someone says dont. My Vertyanov seems dont have this model in it.
Laptop works and can be tricked by split pwm, but i dont want to do this stuff this way.
So anyone really knows if it must be programmed?09-16-2025, 07:11 AM -
Hello all!
Westinghouse TV WD48FAB100 Not Powering On – Burn Mark Found on Power Supply .
I have a Westinghouse LED TV, model WD48FAB100 that is not powering on. Upon removing the back cover, I noticed a burn mark where the AC cord connects to the power supply/main board. In this model, there is only one board combining the two functions. Previous owner said the TV experienced a lightening strike, but who knows. I checked the main fuse, tested OK. Here are a collection of readings from the power supply ports. Looking for some guidance on what to test/check next.... -
I have a Sony 75x940e that I just fixed with the help of the forum (bad emmc). For the last couple of months I was noticing some burn in of the android home icons on dark backgrounds (photo is attached). I always thought VA panels were immune to burn ins. Is there anything I can do to fix it? Could it be because of a failing component other than the panel itself?...07-19-2023, 09:23 PM
Comment