Re: Samsung T260 turns off and on by itself
Hi. Sorry for the lack of updates.
A lot of work came in so I had to put the monitor back together on Saturday and could not do any further measurements, but I will certainly keep this discussion for future reference.
I put two small layers of mica insulator (the kind that you find inside hair driers) between the touch button board and the lamp housing.
So far it hasn't failed again after many hours of work during several days.
My sincere thanks all for your help.
diegus
Member
Last Activity: 06-25-2014, 08:51 AM
Joined: 06-16-2014
Location: Buenos Aires
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Re: Samsung T260 turns off and on by itself
Finally got time to measure the tensions, in both the larger connector that goes from the power to the logic board and in the small connector that goes to the touch button, here they are:
Monitor on (just plug in)[LIST]
PWR-DIM: 5,05
15.0V: 15,22
GND: 0
5,2V: 5,26~5,27 (both of them)
A-DIM: 0,86
ON/OFF: 4,51
3.3V: 3,30
LED: 2,95
KEY1: 3,05
KEY2: 3,29[/LIST]
With the monitor turned off properly:[LIST]
PWR-DIM: 0
15.0V: 15,33
GND: 0...Last edited by diegus; 06-20-2014, 02:31 PM.Leave a comment:
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Re: Samsung T260 turns off and on by itself
Hello again and sorry for the lack of updates, had a very long work day yesterday. I have the day off tomorrow so hopefully will have enough time to find a solution for this.
The cables come from another board that has five or six buttons in them for menu/input/brightness/etc (no shutdown). I guess the chip reads the buttons and send digital signals to the main board.
I'm thinking there is no way that chip can generate enough heat on itself to fail, if that is the problem indeed, so the heat should come form the...Leave a comment:
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Re: Samsung T260 turns off and on by itself
Wow bammbammfran, you are really good at following tracks. Sorry the boards wheren't completely flat when I took them, the flash would have made a mess.
I'm at work not but will do the measurements tonight, hopefully I will have the time.
jetadm123: If that turns to be the case I would have to look into a way to add a switch to turn the power supply on and off. I have no idea yet if it works like a computer power supply when connecting a pin to ground starts it up or it needs some kind of pulse, etc.
...Leave a comment:
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Re: Samsung T260 turns off and on by itself
Thanks both for your suggestions, heat might work, don't know why I didn't think of that if it also works for cellphone screens.
Before continuing I will check if the part can be replaced and the price, just in case anything goes awry.
Getting parts from overseas here in Argentina had become quite difficult under the actual laws and I don't want to go from a working monitor with an issue to a non-working one.Leave a comment:
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Re: Samsung T260 turns off and on by itself
Last update of the night
I took a look under the white bezel and the touch button seems to be glued to the frame, tried to pry it away with the spudger but could not find the slightest separation.
If anyone have any idea how to remove it, I haven't found anything in google yet.Leave a comment:
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Re: Samsung T260 turns off and on by itself
bammbammfran: I just tried as you suggested
- Pull the power cord, put it back in, the monitor powered back on automatically.
- Pull the power cord, disconnected the touch button, plug the power cord, monitor wont start up and also, not clicking noise from the power board.
Applied the hair drier to each board for several minutes and nothing happened. The heat sinks that were warm to the touch got pretty hot (more than I felt comfortable I must say). I used a thick envelope (is what I had at hand) as a heat shield....Last edited by diegus; 06-17-2014, 08:52 PM.Leave a comment:
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Re: Samsung T260 turns off and on by itself
Sorry for the double post... slow connection.Last edited by diegus; 06-17-2014, 08:16 PM.Leave a comment:
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Re: Samsung T260 turns off and on by itself
Thanks for the replys.
bammbammfran: I'm going to try setting it up that way, let it play a movie while I work and timing how long until it it fails.
Do you suggest heating the boards with a hair drier one at a time? I don't own a hot air gun, but also that might be too much heat too.
jetadm123: thanks for the suggestion, I will change some of the pictures and take measurements when I get to make it work open.
What I have found is that if you disconnect the touch button the screen will go off...Leave a comment:
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Re: Samsung T260 turns off and on by itself
bammbammfran, thanks for the reply.
I updated the original post with the info you requested.
I'm not sure yet how the touch sensor works, but I have been thinking if maybe it has some kind of "leak" issue. It has to be capacitive probably so maybe is sending false signals to the power board.
Samsung has made testing this monitor really difficult, there is no way to use it without the back cover on since the boards are not attached to anything.Leave a comment:
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Samsung T260 turns off and on by itself
Hi, I was looking for information on the problem I'm having and there seems to be a lot of knowledgeable and helpful people in this board.
The monitor is a Samsung Syncmaster T260, it started doing this when it was about two years old and has been getting worse in the past three years, in the beginning it would only be sporadically, now it does it daily. The power supply is the IP-54155A.
[B]Setup:[/B]
The monitor is either plugged via DVI to a 2007 mac mini or to a macbook via HDMI. I have 5 outlets behind the desk and the monitor is the only device that fails,... -
Re: New Members - please post your introductions here
Hello to all members. Came here looking for info on repairing a monitor and found a very helpful community with lots of interesting info. Thanks to all that contribute.Leave a comment:
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