I'll try not to create big posts this time (though I'm sure I'll fail).
Ok, here we go...
Back in 2017. one capacitor on my monitor power board failed, so I had to replace it. I decided to change all the caps (except the BIG one), and everything was working well. I had a big help from other members, especially from momaka. He had enough patience to give answer to all my questions.
For those interested in reading that topic, here it is: [help required] which capacitor type for monitor power board
Ok, so, 2 weeks ago... guys from cable company came in, to install cable tv and cable internet connection. For watching TV they used STB device (with card slot) and connected it to my monitor through HDMI cable. It was later that day when I check the TV channels, and then turned the STB device off using a remote control. After I turned it off the STB device had only red standby light.
Next morning, I turned on my pc (and ofc my monitor). I wasn't touching STB device (it still had red standby light). I went out of my room for 10 min, and when I came back, my whole room had a hard smell of burned out electronic. I looked in direction of my monitor and I noticed its turned off. I tried to switch it back but nothing happen.Not even a standby light of my monitor turned on. Nothing!
At the time I wasn't checking the STB device because that was the last thing I cared about, since I was pissed that my monitor became faulty. Couple days later (when I was back using my 7" tablet to find what new monitor to buy) I looked at STB device and noticed that its red standby light is turned off too. I checked it, pulled its cable out of the socket, but nothing. It was broken.
Few days ago I bought a new monitor. And then I started looking for some answers. The same answer I got from other people, I received today when cable company tech guys came to install a new device. I told them what happen and they said its a STB that for some reason sent high voltage to my monitor over a HDMI cable. They also said they have such situations everyday and they installing new devices on a daily basis, every single day. Ofcorse complaining to the cable company itself wont result in anything positive, so that woudl be a lost cause.
Anyway, for some reason, I just can't give up on my 12 year old Samsung 2693HM monitor. If I can, I have to fix it, even though I bought a new monitor. I can't let it rot, if you understand me.
Ok, so...I explained the same thing (to few other places) and people saying, that since when I try to turn on my monitor, nothing lights up, not even a standby light, that it might be that my poweboard is failed.
They suggested me that I should measure the voltage on a BIG fat capacitor, while the power board is (out of monitor) but connected to wall socket though power cable. They said I should put negative wire of multimeter to negative leg of big fat capacitor, and positive wire of multimeter to positive leg of the big capacitor. And after I measure it, that I should report the voltages. After that, they'll tell me what to check next.
Well, I'm a newb. I fear high voltages. I know they are dangerous and...well you make mistakes with that only once (if you know what I mean).
So I decided to come here and ask people who actually are the ones who deal with capacitors on a daily basis.
Can someone tell me:
1. how exactly to measure the capacitor volgate while the power board is connected to power socket though power cable? Did the guys (from other place) told me correcty? Can the cap 'explode' when i touch its legs with multimeter wires?
2. Is the checking the big fat cap first, correct order of steps for trying to figureout what failed on my monitor power board (I would guess its the power board and no other kind of board like inverter, tcon, ...).
Anyone can help? I'm especially interested in SAFE steps about the 1st question No1. I know that I really need to be careful and to do things 100% correctly, so please advise me about that, so that I don't make mistake.
btw. I did disassembled my monitor couple days ago. I tried to see if there anything 'melted' or 'damaged' on power board, but I didn't noticed anything. Some area of the board itself were...'darker', like...it was burned over a year because it was some heat there, more than on other part of the board. But it looked like (kinda) almost the same as it was back in 2017 when I was replacing the caps.
There are two fuses that I checked in multimeter continuity mode and there was a 'beep', so I guess (as a newbie) they are 'ok', though I'm not sure why they didn't protected my power board against failing. (maybe cause they protect what comes though main power cable and not what comes through HDMI cable).
After reading one post (regarding the same monitor) here: https://www.badcaps.net/forum/showpo...0&postcount=12
...I noticed (didn't even knew) that there is another fuse. I can check that too.
Currently I have my monitor assembled back (few days ago), but I'll pull the power board out again if someone is willing to help me navigate through troubleshooting.
Thanks in advance!
