Samsung SyncMaster T240 - 2 seconds then black problem

[KrypteX]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Is this forum thread completely dead? Not even a welcome message, from anyone? Weird...

[KrypteX]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Hi guys, I'm new to the forum (been lurking for a while). Hope this finds you well.

So I have a Samsung T240 with a TM-10160 / NY0902BCT inverter transformer exhibiting the "2 seconds to black" issue. I just measured secondaries S1&S2 at 870 Ohms and S3&S4 at 590 kOhms (yes, that's KiloOhms).
I guess I should order a new transformer, do you guys have any idea where I could get a proper one? Does the code written on the 2nd line (NY0902BCT) matter? I have found a few online with that code having different values.

Many thanks!

[Vil11111]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Found
https://cdn.badcaps-static.com/pdfs/...c8dc5a9678.pdf

[Vil11111]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Good afternoon. I have a monitor Samsung T240 with power supply JP-54155A, REV 1,0 from 2008.03.17
Burned:
Q101-7N65C
R103 - 0.37 Ohm
D103
R19 - 10кОм, face value found in the photos of the forum
IC101 - I do not know which one.
Tell me where to download the scheme or the name of the chip.
Attaching photo. Thank you very much in advance. Attaching photo.

[willi3007]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

thank you for your post.
It will take some days until I can effort the time for mor experiments.
Kind regards and all the best for a healthy 2015
willi3007

[selldoor]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

thank you very much for your further assistance.
Here are now some pictures from the main board .

Pictures are not really clear enough for trouble shooting ( probably not enough natural light)

I have measured the resistance of the secondary inverter coils:
That one nearer to the AC plug has 880 Ohm, the other one 930 Ohm (the inverter still on board).

That looks to be your problem- they should be within 3% .I usually end up buying from ebay China - takes a long time but a lot cheaper.
FIRST desolder the transformer and test again off the board..

How to check the CCFLs lamps?

You can buy ccfl lamp testers - see the lcdparts.net or if you have a working monitor of a similar size you can do some tests by just changing the leads.

How do you get access to the CCFLs in a proper way???

I dont know - all monitors are slightly different - try youtube

Is it possible to check the inverter board by using other CCFLs from a different brand display?

Yes same as above - should be similar size ie 15 inch and 24 inch not good
19 inch and 24 inch - ok for a 5 minute test. 22 inch and 24 inch should be fine. You do not need to remove the bulbs - just change the leads to substitute bulbs one at a time to see if they stay lit.

I use an old laptop panel - smashed but lights are ok.

[willi3007]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Hmm - we still like pictures.
Here is a link to some detail for your transformer.
http://lcdparts.net/TransformerDetai...ProductID=3696
No Power to the board, set your meter to ohms 2000 and test S1 to S2 and S3 to S4. and post results.

thank you very much for your further assistance.
Here are now some pictures from the main board .

I have measured the resistance of the secondary inverter coils:
That one nearer to the AC plug has 880 Ohm, the other one 930 Ohm (the inverter still on board).

How to check the CCFLs lamps?
How do you get access to the CCFLs in a proper way???

Is it possible to check the inverter board by using other CCFLs from a different brand display?


Again thank you for your assistance!

Willi3007

[selldoor]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Hmm - we still like pictures.
Here is a link to some detail for your transformer.
http://lcdparts.net/TransformerDetai...ProductID=3696
No Power to the board, set your meter to ohms 2000 and test S1 to S2 and S3 to S4. and post results.

[willi3007]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Thank you so much for the fast reply:
- the part # of the inverter is TM-10160 / TNE 0913DT
- the board and it's parts look all like brand new - now burns, no Deformation, no colour Change or dirt.
Looking forward to hearing soon again from you

willi3007

[selldoor]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

I want to ask if there is a possibility to check the Inverter coils as long as the inverter is still on board?

Yes what is the part number on the transformer

Is there further a possibility to check between Inverter/caps problem and a problem with the lamps ?

Only by using a spare lamp ( Monitor with good lamp?) or build a test lamp.
https://www.badcaps.net/forum/showth...er+testing+cfl

Caps, inverter and board itself does not show any sign of failure.

AS this is your first post do you have the experience to say that?

See Also
https://www.badcaps.net/forum/showthread.php?t=39740
https://www.badcaps.net/forum/showthread.php?t=10419 start post19

[willi3007]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Having the same "2 seconds then black" problem with my T240, I want to ask if there is a possibility to check the Inverter coils as long as the inverter is still on baord?

Is there futher a possibility to check between Inverter/caps problem and a problem with the lamps ?

Caps, inverter and board itselve does not show any sign of failure.

Thank you very much for assistance.

willi300

[buddacedcc]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

How check CCFLs wiring ?

Solved! Cold solder in CCFL!!!
To check necessary disassembly LCD.

[buddacedcc]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Hi,
T240hd:I replaced transformer (brend new) & capacitor (not low ESR) but problem still present!
Already check fuses and are ok; any Idea ?

How check CCFLs wiring ?

[buddacedcc]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Hi,
T240hd:I replaced transformer (brend new) & capacitor (not low ESR) but problem still present!
Already check fuses and are ok; any Idea ?

[athlon64]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Hi,

I have T240, but I'm missing the value and voltage for :
C109
C114
C118

In the first post picture i could see C109 is 47uF 50 V

I replaced all the capacitors but The problem appear again three days after, so I think it is that i used bad value for these three...

Thanks for your help

[lilluffe]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

I replace whith a ccfl to led kit , and it works !!! for a long time I hope ...

Hi there!
Bringing up the tread again hoppfully for some answer from you.

I have the same problem on my T220HD monitor.
Checked all capacitors and it looks good.
I have checked all the voltage both on mainboard and the other board and it.s ok.
Checked the ccfls and the all lights up in 2 second and then go out, checked them on same connector.
It must be the transformer on the power board.

lu33390
Where did you buy your led conversion set and do you have some instruction on how to change it.

[lu33390]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

I replace whith a ccfl to led kit , and it works !!! for a long time I hope ...

[lu33390]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

I had the same problem (switch off after a few seconds) ;swapping with a CCFL of recovery I finally found that it was the top CCFL (CN304) : during disassembly I overview the wire was stripped and insulation damaged .

[Rtech]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Check the Backlights.

[Sjhtv]

Re: Samsung SyncMaster T240 - 2 seconds then black problem

Any advice please T240 classic two second on off. Have replaced caps and transformer. If I switch the monitor on and off a number of times the screen will come on however to get it to switch on again i have to cycle on/off a number of times. Have wasted too much time on this please any advice or help.