Smasung SyncMaster 913N Monitor wouldnot display images

[selldoor]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

That post is almost a year old!!!
Info looks to be here
http://electron55.ru/monitor/2-samsu...yncmaster-913n

[drac6ir28]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Hello,

Whats is thePart number for U101 on your board. Mine is damaged and I cannot see the part No.

Thank you

[selldoor]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Duh - should have said set meter to 2000 ohms.
Yes you can use diode mode as well - either way you should have 6 results (included the
check that the ~AC ~ is not shorted.
When you replaced the TOPswitch did you replace like for like (metal/plastic tab?) with any insulation sleeves/washers if there were any?.

Other places to test - Big Cap - Care High voltage - meter on 600 vDC - will doublecheck the bridge is working.

Another test for shorts on the inverter mosfets is shown here:
https://www.badcaps.net/forum/showpo...1&postcount=23
No power to the board for that test

[liteace]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

bridge rectifier tested with dmm in 200Ω range:

poss lead to +, neg lead to ~ = open
.neg lead to ~, poss lead to + = open

poss lead to -, neg lead to ~ = open
.neg lead to ~, poss lead to - = open

Testing the bridge rectifier with dmm in diode mode:

poss lead to +, neg lead to ~ = open
.neg lead to -, poss lead to ~ = 575

.neg lead to -, poss lead to ~ = open
poss lead to -, neg lead to ~ = 575

Ive cleaned board with brush and taken a couple more clearer pics

[selldoor]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

I think buds post says somewhere we need both sides of the board. Anyway the bridge rectifier doesnt look good but it may just be the picture - looks to have heat marks and perhaps a small split? -
With no power to the board locate the 4 joints and meter on ohms 200 test 1 to2 then again with leads reversed then 3 to 4 then again with leads reversed and post result in ohms

When you remove the TOP chip test the solder joints for straight shorts.
Also look up "Dim Bulb Test" for future damage limitation

[liteace]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

https://www.badcaps.net/forum/showthread.php?t=39740

Sorry, here is a pic of the board, the TOP246YN is the top one in the pic bolted to the heatsink

Thanks

[selldoor]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Hi guy's, also sorry to drag this one up.

I have the 913n as well that has problems with the power supply board, Ive removed it and all the cap look OK and are not swollen, problem is the TOP246YN (Integrated Off-line Switcher) has exploded.
I replaced it with a new one but that done the same, anyone whats next to test on the board

Thanks

https://www.badcaps.net/forum/showthread.php?t=39740

[liteace]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Hi guy's, also sorry to drag this one up.

I have the 913n as well that has problems with the power supply board, Ive removed it and all the cap look OK and are not swollen, problem is the TOP246YN (Integrated Off-line Switcher) has exploded.
I replaced it with a new one but that done the same, anyone whats next to test on the board

Thanks

[demon326]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

I'm sorry to bump this topic, but this is the only board that has a topic about the Samsung 913N Monitor.

Background story:
About a year ago i started getting a "not in optimum mode" when starting a game or booting windows, so pulling the plug for about five minutes helped for a while, but i bought a new monitor.

Where are we now:
Well, the monitor worked with the pull the plug trick for a little while on an old pc, but now that won't even work, it even won't display any image, not even the "not in optimum mode" message, when i hold the menu button it just says "testing okay" and the the screen goes back to black(back-light also shutdown)..

So i searched the forums and i came here, i opened the monitor so i could take a look at the caps, but they look fine from the outside(no bulding top,no leaks..)

But to be sure i made pics of the circuit board and the logic,videoboard:

[pedro]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

I found out that IC NT68F63LG is burnt, Iook like I got to replace this IC. Is it by shorting these 2 terminals by 47 ohm resistor is not good option?

Well IIRC it pulls the 3.3V rail up towards the 5V supply, which "forces" the internal reg. That's not part of what the processor was designed for. When I first read of that scheme I shuddered. It *may* work some_time for some_people, but I wouldn't recommend it.

When it gets to the point of needing to replace a fried processor, I'd be putting that monitor into the parts heap.

[daiwapro]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

I found out that IC NT68F63LG is burnt, Iook like I got to replace this IC. Is it by shorting these 2 terminals by 47 ohm resistor is not good option?

[PlainBill]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

I shorted link 6 and 5 using 47 ohm resistor it works for 4 hrs, but I smelll something from logic board ic, what cause it?

Shorting 6 to 5 using a 47 ohm resistor.

PlainBill

[daiwapro]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

I shorted link 6 and 5 using 47 ohm resistor it works for 4 hrs, but I smelll something from logic board ic, what cause it?

[Insomniumer]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Hello Again!

I managed to replace NT68F63LG to NT68F63L. I realized that it's NT68F63LG and I ordered NT68F63L from eBay (that link which gonzo gave). I do have SyncMaster 913N and you saw the images from the logic board. So is there any differents between NT68F63LG and NT68F63L?

I'm asking this because after replacing IC, monitor doesn't work 100%. It does display an image, but its kinda screwed up. Colors aren't right, red is too strong, and it can't be fixed by configuring the color tune from the OSD. There is also gray transparent block on the left side, its about 20-30px wide and height 100%.

What could do all this? Wrong IC? Bad soldering? Or something got damaged while replacing IC?

Well, at least i made progress on this project and I'm happy for it.

Thanks in advance! If you want new images, just ask!

[Insomniumer]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Sounds great!
First i'll ask a friend does he have that adapter and does he know how that works, etc.

If i have to buy one of those ICs, do i have to do anything else than soldering it to logic board? Or do i have to flash it also?

I won't give up easily.

And gonzo0815, Thank you very much for your time!
I'll ask if i just need more help (so I'll be here again very soon. )

Thanks.

[gonzo0815]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Well, if you could get some NT68F63L i think you can try it.
I am not sure, if you need to flash the firmware. If you want to save your current firmware, you need a simple adapter VGA > LPT port and the flash tool from the NT68F63L`s manufacturer (Easy Writer").

NT68F63L could be bought from here:

http://cgi.ebay.de/SAMSUNG-LCD-VIDEO...item563401558c

[Insomniumer]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Okey...
So that is the controller. Great.
Flash it via COM port - sounds easy, but is it?
Do i need something very special stuff? Or is it just too much/hard for people like me...?

Thanks.

[gonzo0815]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

The NT68F63L is the one with the sticker. The label indicates the firmware revision, which may be specific for the device / panel.
The NT68F63L has it`s own EEPROM. You can flash it via COM port.
I do not know the cause of your particular problem, but what i do know is that there are a bunch of Syncmasters out there with failing NT68F63L.
Usually the obvious symptom is the "out of range" error, but may be there are other symptoms.

[Insomniumer]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Hello.

I'm kinda uncertain about NT68F63L controller. Monitor isn't displaying images but everything else works fine. By pressing menu it says 'Test Good' and when VGA cable is unplugged monitor notices that.

When i turn on laptop and monitor is plugged, green led light stays on. I think it is some kind sign that monitor is working correctly but for some reason it doesn't display image.

I didn't find NT68F63L controller from my logic board, might be with different name/code? So, with this info, can you say that my problem is also the dead NT68F63L controller? And only way to fix is by replacing controller with new NT68F63L controller?

Images
logic board (panel unplugged for reason)
inverter
both


Thank you very much for your time!
And, yah... I'm a newfaq around (somewhere) here. :/

[PlainBill]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

I have a another problem with a 913N! When I start up to windows I see the windows boot screen, but when the log on schreen are loading I have this message on the screen: not optimum mode.

What are the problem on the big elco I have 315 Volt.
It is not a software problem on my comuter!

This one can be traced to the unit between the keyboard and the chair. And it's easy to fix. The monitor is telling you that the resolution provided by the video card does not match the native resolution of the monitor - "Not optimum".

PlainBill