Re: Samsung 2693HM - Doesn't turn on (no standby)
When you did it with gas stove, ...did the 'flame' touched the board from the bottom, or you held the bottom of the board even above the flame of gas stove? Could the flame (if 'licks' the board) damage the board or its components?
Ok, thanks. I think I understood. Just 2 extra questions:
1. Does that means, that even if I find the chip with the same 'speed' like 1.4ns or same frequency, it MUST be made by the same chip manufacturer (in this example Samsung) or it can be from...
twist3r
Senior Member
Last Activity: 11-26-2023, 12:39 PM
Joined: 10-05-2017
Location: s3rbia
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Hey momaka. Thanks for your reply! And sorry for this 1 month late respond. To be honest, I felt (and still am) exosted from 2 months of chasing the ghost.
At the time when I bought the spare main/logic board, I felt the pressure to test it. It was because I bought it of an auction site, and the seller was saying 'don't swap the firmware chips' just put the board in the monitor and try if it will work.'. He was saying same what you were told me. But I had to contact you, and thats why I filled your PM box, cause I...Last edited by twist3r; 02-18-2021, 10:28 AM.Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Ok, and finally the interesting part (I know I bored you complitly with my questions ^ above. Again, sorry about that, I really had to ask them)
You guessed most of it (if not even everything) correct.
Ok, I didn't changed the firmware chips (one of the reason being for not being 100% sure which one is the correct one, or should I switch not one but two chips from one board to another.
DVI and HDMI ports work (didn't tested VGA port, but there should be no reason not to...Last edited by twist3r; 01-16-2021, 07:09 AM.Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
^ sorry for too many quoted-quotes. I think its 'good' if anyone else decide to peak inside this topic and read this epic conversation, he wont get lost in here, hopefully.
Ok, I have to say that, since I got no knowledge, somtimes (most of the time) I got to ask stuped quetions. Sometimes I don't realize how stuped they may be, and sometimes, I ask them anyway, even when I know that the question sound stuped. Simply because I'm trying to 'learn' things and gets to their 'core'....Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Hey momaka. Thanks again for another great reply!
I'm sorry that I made your PM box full. I Apologize for doing that.
Thanks for the tips. I tried first to solder the cap while first putting solder on both pads. But... once I soldr one side, the other side of the capacitor would be 'up in the sky'. And when I melt the solder on that side, it wont help because the first page that I solder the capacitor on, was firm in holding that side and not allowing opposite side to 'lay' on the pad....Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
One extra information that I've found in another topic (post #26):
[URL="https://www.badcaps.net/forum/showthread.php?p=725045#post725045"]Samsung SyncMaster 2693hm - Dead backlight[/URL]
While ensign.fodder's monitor had different issue, he measured some voltages there and, as it can be seen, he also found that the POWER_EN (or PSUs Power ON/OFF) pin has 3.2v, which is exactly what I got (3.214v).
So that might also confirm that ~3.2v (~3.3v) is expected voltage on POWER_EN (Power ON/OFF)...Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Freaking 10K limit...
Anyway, I'm trying to allow myself to think that the new main/logic board should work 'ok'. But I got some questions before I proceed:
1. The fact that I used spare 102nF instead of 100nF capacitor (which I lost) is no big deal, correct?
2. I want to dissolder firmware chip from my 2693HM main board and solder it to 2493 main board. Two questions here:
a) whats the easiest way to desolder it (and not damage all 8 legs) with an soldering...Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Ok, some news here...
First, I was trying to figureout why the main board for 2493HM monitor has some elements (I counted 5) missing compared to the main board of my 2693HM monitor, even though the board model (and revision) is the same: [b]BN41-00962A[/b]. Then, I ended up on shopjimmy website where he had 2 boards, but for different monitors (one for 2493HM and one for 2693HM). And finally I noticed the difference. At the back of the main/logic board there is a sticker with some code. Part of the code is what makes...Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Next thing I did was to measure a voltage on L300-L305 and L307 ferrite beads. One thing that I learned here (by doing it) is that I can't measure a voltage of a ferrite bead which is soldered on the board by putting probes on both side of the ferrite bead, because measuremant is then 0.000v (or 0.001v). But I had to touch the ground point with a black probe and use red to touch sides of the ferrite bead.
For those ferrited beads which were desoldered I coudl touch their paids with both probes touching one of the pads and I...Last edited by twist3r; 01-03-2021, 11:20 PM.Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
momaka, I wish you a Hapy New Year! (and same to everyone else, ofcorse)
Also, thanks for again replying to my topic.
Yea, it was very hard. I used my tweezers, which are not the kind of tweezers meant for soldering. And while I was using the tweezers along with Edsyn FL-22 flux-gel, capacitor gets stickied to a tweezer. So a lot of time i was like 'where the f* that capacitor dissapeared. It was there just a second ago'
As for your 2nd tip, ...yea, I didn't thought...Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Well, few days ago I was obsereving a main/logic board from a 2493HM monitor, since the model is the same as for my (2693HM) monitor.
Model of the main/logic board is: BN41-00962A
At first I thought that the guy (the seller) was selling some faulty board, because I noticed that some elements are missing. But then, I remember that in the service manual for my monitor (which is the same for 2493HM monitor as well), had some parts where it sais "2493HM DELETE".
So I was like: Ahaaa, ok!
...Last edited by twist3r; 12-29-2020, 08:12 PM.Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Thanks momaka for the ^ explanation! I would have to re-read some parts of your post and try to understand them. There are certain things which are 'basics' but my mind just refuse to 'click' and understand them. The more I'm trying, the more I'm getting angry for not understanding simple things.
Let me try to answer on some of your request from your first post ^^.
Ok, so...
I measured resistance to ground of 'left' pad (of L307) and it was 245.6 Ohm. Then I measured resistance...Last edited by twist3r; 12-24-2020, 11:34 PM.Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Hey momaka! Thanks for another reply!
I was thinking (kinda) in the same direction when I removed that L307 and observed monitor service manual at page 79. But... there are things that I coudn't figureout there.
First, L307 is connected as you said to [b]AVDD_DVI[/b] line. What I don't understand is: why its called '[b]_DVI[/b]' line? I see the marking, but what confusing me is that (what I suspect all this time) a higher voltage came through HDMI cable from a cable TV device. At page 79 (service...Last edited by twist3r; 12-20-2020, 09:32 PM.Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Ok, thanks for this reply. Couple years ago I bought a [b]MiniPro TL866A[/b] programmer, and I already read and write few bios firmwares from PC motherboards. So, I guess same would be for reading/writting the firmware for that Samsung monitor. The only difference is: I pulled out the bios IC from its socket on Asus motherboards, while in the case of monitor firmware IC, I would have to desolder it first. I beleive I already ahve 'sockets' (or whats they called?) for putting a desoldered IC into it, and further...Last edited by twist3r; 12-13-2020, 04:31 AM.Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Hey momanka! Thanks again for your reply!
I'll first comment on the subject revolving around that IC602 and IC924 circuit. I wont quote that part of your quote because I will probably again exceed the 10K character limit.
Ok.... For last 2 hours I was staring at my monitor datasheet. I was looking at IC602 (and IC924) and the circuits around it, trying to understand how it works after you gave me the answer. Both ICs (IC602 & IC924) are the same. So I was checking dataseet of these 2 ICs...Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Ok... I fear that last sentance between the brackets described it perfectly.
So here it is:
I desoldered [b]BD1005[/b] ferrite bead and measured resistance on the C621 capacitor (black on negative leg, red on positive let).
Resistance was the same as before: 0.7 Ohm
Then I started with:
removed L300 -> resistance of C621 was 0.7 Ohm
removed L301 -> resistance of C621 was 0.7 Ohm
removed...Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
I wont care much if my 2693HM monitor is recognized as 2493Hm monitor. But still.... that 'information' must be 'written' somewhere (inside some cheap or something). Thats why I asked if I should use programmer or something to 'upload' the information into an IC if such information is required. I know it might be supid of me to think that (I'm a newb ), but for instance... 2[b]4[/b]93HM has less CCFL lamps than 2[b]6[/b]93HM (at least thats what I concluded by observing different inverter boards between 2493HM...
Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Ok, after you made this post, I created one extra post asking you about correct pin location (because their position was not the same when compared between Samsung Service Manual and diode datasheet). You said, thats not important right now, and we are only seeking to find resistances between them.
So, I'll use (as you suggested) Service manual as a refference. That means, when I observe the diode (on main/logic board), at one said it has 2 pins, and on the oposite side there is only 1 pin. The side...Last edited by twist3r; 11-16-2020, 02:28 PM.Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Ok, thanks again for this information. I'll leave this case for some other time. I think I started way too much to flood this topic with my offtopic questions. So... once when we're done with this (Samsung 2693HM) monitor, I might ask more questions regarding that 'other' monitor (in maybe some other topic).
Ok, connected ONLY Power (PSU) board through cable to a wall socket rail (230v). Here are the results:
[b]All 3 pins for 5.3v rail show 0v...Leave a comment:
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Re: Samsung 2693HM - Doesn't turn on (no standby)
Thanks again momaka for your answer(s)!
I'll try to answer on most questions. First I'll try to post answers (or ask question) regarding previous posts, and then I'll post some measurements that you asked me to do
Well... thats the thing thats confusing me a bit, now. You see, Samsung 2493HM monitor has the same main/logic board as Samsung 2693HM. They have exactly the same mark: BN41-00962A
(and I was thinking, IF all this fails, I could try to buy used main/logic board from model 2493HM,...Last edited by twist3r; 11-16-2020, 02:23 PM.Leave a comment:
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