Smasung SyncMaster 913N Monitor wouldnot display images

[marco456]

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!

[ausheaven]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

You need to take the readings of the connector above cap 10 & 11, not the signal cable outputs. The connector should be marked with 12v, 5v ,BL_ON labels. You need to be sure PSU is not the problem before moving on to other things/parts

Thanks for the advice.
That was what I am trying to do.
That area was one that I miss. The cable harness that bridge to the video card
Starting from the RED wire as 1 - +ve - Plugged into the Video card.
1-2 0 - volt - (Appears to be the same point)
1 -3,4 & 5 - 12 Volt.
1- 6&7 - 8 Volt.
1 - 8 - 12 Volt.
1- 9 - 8 Volt.

6,7 (+ve) - 3,4&5 - 5 Volt
6,7 (+ve) = 8 - 0.5 Volt
6,7 (+ve) = 9 - 2.5 Volt

Signal cable plugged into Video card but not connected to PC.
All value the same except
1- 9 -12 Volts (??)


Harness unplugged from the Video card.
1-2 0 - volt -
1 -3,4 & 5 - 12 Volt.
1- 6&7 - 8 Volt.
1 - 8 - 8 Volt. Note different value to unplugged (after double check)
1- 9 - 12 Volt. Note different value to unplugged (after double check) but same as with signal cable connected (??)

6,7 (+ve) - 3,4&5 - 5 Volt
6,7 (+ve) = 8 - 4.0 Volt.-Note different value to unplugged (after double check
6,7 (+ve) = 9 - 1.5 Volt Note different value to unplugged (after double check

[EGuevarae]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Folks,
I've given some wrong info.
The second signal cable Ssc described previously is fact an extension cable, therefore everything regarding this cable is not true. Sorry for putting you people in the wrong direction.

I've since taken a few readings.

Output of monitor with no signal cable connected.

Pin 6 – 5 Volts
Pin 11 – 5 Volts
Pin 12 – 1.3 Volts
Pin 13 – 0.8 Volts
Pin 14 – 5 Volts.
All the others – 0 Volt

With signal cable plugged into the monitor but not connected to the computer.

Corresponding readings are as follows.

Pin 6 – 0 Volts – (Compared to 5 Volts without the cable !!!)

All other remain the same.

Pin 11 – 5 Volts
Pin 12 – 1.3 Volts
Pin 13 – 0.8 Volts
Pin 14 – 5 Volts.
All the others – 0 Volt


Signal cable configuration - Pin 2,6,15 –Connected to the body of the plug.

Have marked the power supply capacitor.

Volts across capacitor of the power supply.With no signal cable.
Cap 1 -12.5 Volts
Cap 2 – 5 Volts
Cap 3 – 5 Volts
Cap 4 - 12.5 Volts
Cap 5 - 0.075 Volts – (47micorfarad rated at 35V - ???).
Cap 6 – 3.5 Volts
Cap 7 -12.5 Volts
Cap 8 -12.5 Volts
Cap 9 – 5 Volts
Cap 10 – 5 Volts
Cap 11- 12.5 Volts
Cap 12 – 350 Volts.

With signal cable plugged into the monitor but not the computer.

All Volts reading are the same except.

Cap 5 – Gone down to 0.0 Volt (Zero) – (47micorfarad rated at 35V - ???)

Could this be the area at fault?
Don't have any circuit diagram.
Can anyone put a finger to it?

You need to take the readings of the connector above cap 10 & 11, not the signal cable outputs. The connector should be marked with 12v, 5v ,BL_ON labels. You need to be sure PSU is not the problem before moving on to other things/parts

[EGuevarae]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Capacitor replace with matching volt, capacitance, temperature electrolytic typeof different brand. Polarity also checked.
Pics attached.
Flashing light only happen when video signal cable is plug (one cable cause it but another cable don't, even when one end is disconnected from PC) as described.
Pic attached.

Which brand? V rating and capacitance are not the most important thing here. You need also to take into account ESR.
Information is incomplete.

[ausheaven]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Folks,
I've given some wrong info.
The second signal cable Ssc described previously is fact an extension cable, therefore everything regarding this cable is not true. Sorry for putting you people in the wrong direction.

I've since taken a few readings.

Output of monitor with no signal cable connected.

Pin 6 – 5 Volts
Pin 11 – 5 Volts
Pin 12 – 1.3 Volts
Pin 13 – 0.8 Volts
Pin 14 – 5 Volts.
All the others – 0 Volt

With signal cable plugged into the monitor but not connected to the computer.

Corresponding readings are as follows.

Pin 6 – 0 Volts – (Compared to 5 Volts without the cable !!!)

All other remain the same.

Pin 11 – 5 Volts
Pin 12 – 1.3 Volts
Pin 13 – 0.8 Volts
Pin 14 – 5 Volts.
All the others – 0 Volt


Signal cable configuration - Pin 2,6,15 –Connected to the body of the plug.

Have marked the power supply capacitor.

Volts across capacitor of the power supply.With no signal cable.
Cap 1 -12.5 Volts
Cap 2 – 5 Volts
Cap 3 – 5 Volts
Cap 4 - 12.5 Volts
Cap 5 - 0.075 Volts – (47micorfarad rated at 35V - ???).
Cap 6 – 3.5 Volts
Cap 7 -12.5 Volts
Cap 8 -12.5 Volts
Cap 9 – 5 Volts
Cap 10 – 5 Volts
Cap 11- 12.5 Volts
Cap 12 – 350 Volts.

With signal cable plugged into the monitor but not the computer.

All Volts reading are the same except.

Cap 5 – Gone down to 0.0 Volt (Zero) – (47micorfarad rated at 35V - ???)

Could this be the area at fault?
Don't have any circuit diagram.
Can anyone put a finger to it?

[ausheaven]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

1.- What did you use as replacements. Flashing green may indicate a PSU problem.
2.- Post good size/quality pictures of both PSU/INV and Video/Signal boards

Capacitor replace with matching volt, capacitance, temperature electrolytic typeof different brand. Polarity also checked.
Pics attached.
Flashing light only happen when video signal cable is plug (one cable cause it but another cable don't, even when one end is disconnected from PC) as described.
Pic attached.

[PlainBill]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

How do I post the pic. I got the pics but when trying to insert the image I only have a big one (last image) displayed on the screen not all three.
Beside, the submit button is no where to be seen.

https://www.badcaps.net/forum/showthread.php?t=1868

PlainBill

[ausheaven]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

How do I post the pic. I got the pics but when trying to insert the image I only have a big one (last image) displayed on the screen not all three.
Beside, the submit button is no where to be seen.

[EGuevarae]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

After absorbing all the info regarding my 913N monitor which has exactly the same symptom described in this forum I set about replacing all the 12 capacitors and begin the test with hope that it is fixed. Afraid no joy !!!
This is what was performed after the replacement.

1. Signal cable disconnected. Monitor power switch on.
2. Monitor display “Check Signal Cable” box slowly float across the screen.
3. Press all other buttons individually and held for more than10 sec. No change.
4. Plug in First signal cable (Fsc) which is connected to computer-(Unplug and switch off). Screen went blank.
5. Green “ON/OFF” light went off.
6. Press “MENU” (No 1 =Left to right) button, Green light comes on – Screen livened up with message “Test OK” come on for a few second then Green light went off & went blank.
7. Unplug Fsc from computer (Power disconnected and switched off), Screen still blank, Green light off. Press “ Menu” button AGAIN – Screen livened up with message “Test OK” as Step 6 above.
8. Unplug Fsc from monitor, screen come back and revert to condition (1) above.
9. Replace Fsc with a Second signal cable (Ssc).
10. Plug one end into the monitor. Screen continue to display “Check Signal Cable” box float across the screen. (Why did it perform differently to Fsc step 7 above?)
11. Plug Ssc into computer (Still switched off). Screen went blank immediately. Green light blink intermittently even left for a long time. Why ?
12. Press “MENU” button, Green light comes on – Screen livened up with message “Test OK” come on for a few second then Green light went off & went blank. The same as it did with Fsc.
13. Another strange happening, when pressed together MENU (Button 1) and Button 2. The screen went blank and the Green light comes back after a few second.
14. If I am lucky I can get a flash of a white line about a quarter way from the bottom for one or two sec. Pressing any other button will not bring back the condition of Item 2. Only the ON/OFF will bring it back,

Not sure if this forum can be revived with new ideas.
Can anyone suggest what is wrong Is it the video control card that is buggered or there is still something wrong within the power supply?

1.- What did you use as replacements. Flashing green may indicate a PSU problem.
2.- Post good size/quality pictures of both PSU/INV and Video/Signal boards

[ausheaven]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

After absorbing all the info regarding my 913N monitor which has exactly the same symptom described in this forum I set about replacing all the 12 capacitors and begin the test with hope that it is fixed. Afraid no joy !!!
This is what was performed after the replacement.

1. Signal cable disconnected. Monitor power switch on.
2. Monitor display “Check Signal Cable” box slowly float across the screen.
3. Press all other buttons individually and held for more than10 sec. No change.
4. Plug in First signal cable (Fsc) which is connected to computer-(Unplug and switch off). Screen went blank.
5. Green “ON/OFF” light went off.
6. Press “MENU” (No 1 =Left to right) button, Green light comes on – Screen livened up with message “Test OK” come on for a few second then Green light went off & went blank.
7. Unplug Fsc from computer (Power disconnected and switched off), Screen still blank, Green light off. Press “ Menu” button AGAIN – Screen livened up with message “Test OK” as Step 6 above.
8. Unplug Fsc from monitor, screen come back and revert to condition (1) above.
9. Replace Fsc with a Second signal cable (Ssc).
10. Plug one end into the monitor. Screen continue to display “Check Signal Cable” box float across the screen. (Why did it perform differently to Fsc step 7 above?)
11. Plug Ssc into computer (Still switched off). Screen went blank immediately. Green light blink intermittently even left for a long time. Why ?
12. Press “MENU” button, Green light comes on – Screen livened up with message “Test OK” come on for a few second then Green light went off & went blank. The same as it did with Fsc.
13. Another strange happening, when pressed together MENU (Button 1) and Button 2. The screen went blank and the Green light comes back after a few second.
14. If I am lucky I can get a flash of a white line about a quarter way from the bottom for one or two sec. Pressing any other button will not bring back the condition of Item 2. Only the ON/OFF will bring it back,

Not sure if this forum can be revived with new ideas.
Can anyone suggest what is wrong Is it the video control card that is buggered or there is still something wrong within the power supply?

[dan86]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Smokes,

Take the stand off the back with the four screws. Then gently seperate the silver from square from the black casing - there are various internal plastic clips just holding it and they break really easily but don't affect it as it screws on anyway.. You then have a metal cast behind the black case so remove the black case. Then remove the cast and theres a few screws holding the silver square front on. I cannot fully remember to be honest but its goes something like the above. However just been a little careful when sperating the square silver front from the black back case because it marks really easily.

You should be able to see how it all fits together. Theres not alot to this screen. My screen is still working great, the "Big Boy" is doing a great job :P

If you need any help just ask.

Daniel

[Smokes]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Sorry for asking such a dumb qustion but how do i open the case of the samsung 913n as i just want to fix the screen not optimised fault rather that throw it in the thrash.
I have the equipment but have not done any electronic repairs for a long time!

[canadan]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Hi,

I've got the same Problem (resolution not set to optimum/no signalin a Samsung 910TM.
The current going out of the very good looking inverter Board between 1(red) Plus and the other pins are 2; 0V, 3;12,5V, 4;12,5V, 5;12,5V, 6; 7,5V, 7V; 7,5V, 8; 12,5V, 9V.
I am not sure which pin 5 and 6 you guys are talking of and I can't find it in the respective part of the post. Can anyone tel me if the pins are suposed to be the ones on the SE7888/SE7888 Chips?

Cheers, canadan

[PlainBill]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Here is a photo of the back of the board. The dark stuff surrounding the solder points is rosin flux from my desoldering braid. I didn't clean it from around the contacts, but I did clean it from the contacts using a q-tip before soldering the new caps into the board.

OK, that appears to be a different layout. I can't even see the drivers for the inverter transformers!!

I would like pictures of both top and bottom of the board. And from more directly overhead, if you could.

I see what might be a picofuse just to the right of the ugly green blob. Check that.

PlainBill

[samainfirenight]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Here is a photo of the back of the board. The dark stuff surrounding the solder points is rosin flux from my desoldering braid. I didn't clean it from around the contacts, but I did clean it from the contacts using a q-tip before soldering the new caps into the board.

[samainfirenight]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

I will charge the battery on my camera and post a pic as soon as I can.

[PlainBill]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

My case mod inverter did not have the right connector to allow the ccfl's to plug into it. I completely disassembled the LCD and visually examined the bulbs, they are noticeably blackened at one end, does this mean they have burned out?

Probably not. Some blackening is normal as the tube ages.

I would suggest attaching a clear picture of the bottom side of the card. This will allow identifying points to test.

PlainBill

[samainfirenight]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

My case mod inverter did not have the right connector to allow the ccfl's to plug into it. I completely disassembled the LCD and visually examined the bulbs, they are noticeably blackened at one end, does this mean they have burned out?

[PlainBill]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Thanks PlainBill, I'm glad I haven't tried checking them yet. I have a black-light system in my computer case; I have heard that you can use them to check ccfl's. I don't want to blow up my lights, but I would like to rule out whether it is the bulbs or the inverter board.



The above is true, if I turn off all the lights in the room at night I cannot see anything on the screen. But if I turn on the light, and look at the screen at an angle I can see the pictures on the screen.

Can I take the inverter from my black-light system and hook it to the ccfl's in the monitor to see if they light up? If so; how do I know which way to plug them in?

If you are talking about something similar to a case mod light kit, congratulations, you have reinvented the CCFL test fixture. CCFLs don't have polarity.

Odds are the problem is in the inverter, but your way will quickly prove the CCFLs are good.

PlainBill

[samainfirenight]

Re: Smasung SyncMaster 913N Monitor wouldnot display images

Thanks PlainBill, I'm glad I haven't tried checking them yet. I have a black-light system in my computer case; I have heard that you can use them to check ccfl's. I don't want to blow up my lights, but I would like to rule out whether it is the bulbs or the inverter board.

If you can only see anything on the monitor if you use a light source external to the monitor there is a problem with the inverter.

PlainBill

The above is true, if I turn off all the lights in the room at night I cannot see anything on the screen. But if I turn on the light, and look at the screen at an angle I can see the pictures on the screen.

Can I take the inverter from my black-light system and hook it to the ccfl's in the monitor to see if they light up? If so; how do I know which way to plug them in?