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
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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
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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
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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
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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
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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... -
I have an AOC U27G3X 4K gaming monitor that I use both as a TV and for gaming on a Nintendo Switch 2 console. Recently, something very strange has been happening to it. After playing a game that has an on-screen timer for a few minutes, the last digit of the timer (the one rapidly flickering from 0 to 9) appears to burn in on the monitor. Going to a different source or power cycling the monitor does not help; there is a constant flickering area on the screen where that digit was.
It seems strange that only that digit would burn in, and NOT the other digits that are changing less frequently....10-23-2025, 04:33 AM -
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 -
it was working yesterday, i opened it up and saw this mess. boardview and schematic uploaded for convenience.
PU200
pin 17 vreg5 = 0v ~ solder joint was corroded and flicked right off with my probe, was able to get clean and reflow, rest look fine.
pin 8 vreg3 = 0v
pin 13 en = .2v
pin 1,6 entrip1,2 = 0v
b+ and b++ = 19.5v
+5valw = 0v & 25+ohm to ground
+3valwp = 0v & 25+ohm to ground
i cleaned the board up just a little and can get more pics.
where should i be looking? thx... -
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
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