Question about Samsung SyncMaster 203B LCD Monitor

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The backlight is very low at first power on and turned off imidiatlay after a few trayis it will work OK Is it the backlight lamp and will any lamp of 20" will do Thank you

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Look for bad caps first: http://s807.photobucket.com/albums/yy352/budm/Samsung%20203B/

If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed SAMSUNG monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Posted on Sep 30, 2010

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Posted on Jan 02, 2017

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The screen of the laptop is not clear, it so dark but the operating system is ok


Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp.

Sep 15, 2010 | Fujitsu Computers & Internet

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I have a toshiba satellite m105-s1021. when i turn it on, i hear it running but the screen stays black...so i pluged vga to it. works fine there...looked around for errors, none, updated drivers,but no...


Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp

Sep 12, 2010 | Toshiba Satellite M105-S1021 Notebook

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Screen doesn't work, when it does turn on it fades and I can't see it? Might be screen inverter? or lamp blown?


Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp

Sep 10, 2010 | Dell Inspiron 1525 Notebook

1 Answer

I turn computer on i hear it coming on but no picture screen stays black


This might be a sign of a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp.

Aug 26, 2010 | Computers & Internet

1 Answer

My laptop screen is bright. Brightness control works but no picture. The picture is ok on external monitor. Sometimes a faint and incomplete picture appears on startup but disappears after a few seconds....


This might be a sign of a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp.

Aug 25, 2010 | Compaq Presario 700 470024-192 Notebook

4 Answers

Samsung 920nw Turns on, warms up then goes off.


Yes, it can be bad lamp assemblies (see my bad backlight album) due to poor soldering works or just worn out. You need a set of spare lamp assemblies to find out if it is the lamps or the inverter circuits, the inverter goes into shutdown mode if there are short circuits, or the lamps are drawing too much current, or the lamps do not conduct after firing voltage is applied to the lamps. You can also have open/shorts winding of the inverter transformers. One thing about the caps are that they can look OK but have high ESR. One experiment you can do is to heat up the caps using hair dryer for about 3~4 minutes then plug the monitor to the outlet and see if the lamps will stay on.
Here is the service manuals, at least you can take some voltage measurements.
http://elektrotanya.com/?q=showresult&megnev=samsung&megnev2=920nw&kategoria=&kat2=all

http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Jun 04, 2010 | Samsung SyncMaster 920NW Monitor

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My dell e1404 laptop is having a issue with the screen. When you turn on the computer the screen will come on for about 30 seconds and then go off. When it's on everything looks normal. once it goes out...


The inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. The inverter board converts low voltage DC power (few volts) supplied by the motherboard to high voltage AC power (few hundred volts) needed for the backlight lamp.
When the inverter board works properly, the backlight lamp gets power and the LCD screen lights up. As a result, the image on the screen is bright. If the screen is dimming down, means that the inverter is failing in it;s job to supply the needed voltage to the Backlight.
The Inverter is mounted underneath the display screen and is connected by a two wire plug.

Nov 07, 2009 | Dell Inspiron E1405 Notebook

2 Answers

Dell screen goes black , after 2 seconds but when low down the brightness it work good it not goes off , but it is very low brightness and difficult to read text some time ,


but when low down the brightness it work good it not goes off , but it is very low brightness and difficult to read text some time......WHAT?

Can you explain in a bit more detail please...I don't know what you mean by.........
'when low down the brightness it work good'?

But try holding down the FN key on your keyboard & tapping the 5fc1ca0.png Button that alters the brightness.

Sep 04, 2009 | Dell InspironTM 1501 Notebook

1 Answer

Monitor flickers or 1/3 turns black, have tried wiggling cable, and moving/tapping monitor, sometime it works great, other times i fight this every few min. Doesn't matter if i turn computer all the way...


You may have a faulty inverter or loose power inverter connection. OR
You may have a defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp.
Connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out
www.lcdparts.net

Aug 31, 2009 | ViewSonic VA2226w 22" Widescreen LCD...

1 Answer

My Screen goes black fter a few minutes


You could have a defective screen - a defective inverter or a CCFL lamp or simply the video cable needs reseating. After reseating the video cable and the problem is still there then :- To determine if you have a LCD screen or video card problem, read this and follow the instructions. Defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case. The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills. Check out www.lcdparts.net for parts, repair service and DIY info.

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