Re: Samsung 275T 2 seconds to black
so does this mean the think tank has run dry? stumped by a Samsung product?
wetwillyskate
Member
Last Activity: 07-26-2012, 01:35 PM
Joined: 06-10-2012
Location: Greenville SC
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Re: Samsung 275T 2 seconds to black
anyone still out there?Leave a comment:
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Re: Samsung 275T 2 seconds to black
F1 fuse is still ok. 2.5kOhm between metal connector housing and fuseLeave a comment:
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Re: Samsung 275T 2 seconds to black
I dont have a C603 cable, ie it is not installed in this monitor for whatever reason. The CN400 cable is not shorted internally. below is a picture of the T-CON board. The fuse on the board is ok. I tried to disconnect the 2 ribbon cables to isolate the board, but i felt like i was going to break them....Leave a comment:
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Re: Samsung 275T 2 seconds to black
Pics......Leave a comment:
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Re: Samsung 275T 2 seconds to black
The left pin isn't connected to fuse F601, middle pin is connected to gnd, and right pin measures 184ohm to gnd.
It also occurred to me to measure the fuse short to gnd with the boards disconnected. with the boards disconnected the short is removed. The short returns when the CN400 connector is plugged in which connects to the board at the top of the monitor that i havent looked at yet. This a 30pin multi color connector. I will upload a pic in a sec...Leave a comment:
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Re: Samsung 275T 2 seconds to black
Any new thoughts guys? I feel like we're really close to identifying the problem...Leave a comment:
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Re: Samsung 275T 2 seconds to black
F601 is connected to C608 on one end as well as the pins you showed. The other end of the fuse is connected on the other side of the PCB to IC600, which is a 4435B (MOSPHET), so it is like the diagram i just needed to flip the board!Leave a comment:
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Re: Samsung 275T 2 seconds to black
Its close, a couple differences are that my F601 fuse is a 3A, and i cant seem to find an F600 fuse on my board. Also CN603 is not used. Im not seeing an 8 pin MOSFET like shown in the shematic. there are other ICs nearby but i dont believe i see any FETs...Leave a comment:
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Re: Samsung 275T 2 seconds to black
correction, F601 is the fuse that is blownLeave a comment:
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Re: Samsung 275T 2 seconds to black
I have a milli-ohm meter at work that i can grab tomorrow if need be. tonight i'll use my meter though.
F600 is the fuse that was/is blown.Leave a comment:
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Re: Samsung 275T 2 seconds to black
hmm, one side is open, the other is reading .5ohms to chassis. I guess something is shorted to gnd then?Leave a comment:
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Re: Samsung 275T 2 seconds to black
yes. I edited my last post to reflect these findings since my measurement for budm was initially wrong.Leave a comment:
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Re: Samsung 275T 2 seconds to black
I'm editing the post i just made, I'm assuming nobody read it. My readings were off thanks to the way i have things set, up the respective boards weren't tied to chassis. Alligator clips solved that issue.
Turns out i have ~5VDC on one side of the fuse....and a blown fuse again! Im not exactly sure when it blew.
Another thing to note that during all this i removed the resistor (RM802) i mentioned at the beginning of this thread and it measured out @ .987MOhms. The color code is black yellow green black and gold, which...Leave a comment:
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Re: Samsung 275T 2 seconds to black
Back to the drawing board
Replacing the blown fuse did nothing. Im thinking that maybe the fuse was blown as part of my probing around the PCB and had little/nothing to do with the actual failure.
New suggestions? I brought an o-scope home from work so if anyone can think of any tests/checks for me to do im ready...Leave a comment:
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Re: Samsung 275T 2 seconds to black
I've ordered a couple through Mouser, and a sample from the manufacturer themselves (littlefuse.com). Since its a time delay fuse I'm suspicious of a short.Leave a comment:
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Re: Samsung 275T 2 seconds to black
I've de-soldered the fuse. Once i re-spec it and replace it ill post the result.Leave a comment:
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Re: Samsung 275T 2 seconds to black
...and again, just getting a feel for forum rules...Leave a comment:
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Re: Samsung 275T 2 seconds to black
...and now the images...Leave a comment:
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Samsung 275T 2 seconds to black
I pulled my 275T out of the closet to fix it this weekend after i tossed it aside for the infamous "2 seconds to black" issue.
That being said i've been lurking around forums trying to solve this problem on my 'own' but im not getting too far. Apparently I'm the only person that bought a 27" monitor 3+ yrs ago; or at least I'm the only guy with a broken one.
these 2 forums were close, but not quite enough info for me:
[url]https://www.badcaps.net/forum/showthread.php?t=18601[/url]
[url]https://www.badcaps.net/forum/showthread.php?t=17325[/url]...Last edited by wetwillyskate; 06-10-2012, 10:00 PM.
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