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Question about Samsung SyncMaster 173S (Black) 17 in. Flat Panel LCD Monitor

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Samsung 173S LCD monitor is dark

I have several of the Samsung 173S monitors. Power the unit up without the VGA cable and the backlights are burning ok. Plug in the VGA cable and the video is very dark. It is like it lost the Green or lumanance video. Sometimes the unit works normal. I am attempting to order a service manual. JStigler

Posted by Johnny Stigler on

  • 3 more comments 
  • Johnny Stigler Oct 19, 2007

    I did get a service manual but have not gotten the scope out and investigated.  If you are into component troubleshooting then I would be glad to share the tech doc with you.



    Johnny

  • Jacob Dean Apr 10, 2008

    jstigler,
    I am having the same problem. I figure the problem is with the internal VGA processor board, and I have so far taken my monitor apart. I am still trying to find a replacement board though.

  • Jacob Dean Apr 10, 2008

    My monitor is having the same problem. I figure it is the internal VGA processor board and have already taken the thing apart. Please send that manual, just in case I am wrong.

  • Anonymous Nov 18, 2008

    I have a similar problem. The monitor without the VGA cable attached turns on to the diag screen (the "Check Signal Cable" and R G B cubes moving dialog), but as soon as I connect the VGA cable (tried several of them, with 4 computers ...), the screen shuts off and the power led starts blinking.

  • gmebey Feb 08, 2009

    I'm also having the same problem and noticed if I unplug the VGA cable and replug it in that 75% the monitor will power up.



    Anyone got a service manual? I got a Electronics lab at the disposal.

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I had the same problem.
I opened the unit and checked all the caps- None were bloated or obviously in trouble. I checked the voltages on the two regulators on the green vga proccessor board. They should be 2.5 v out on the left on and 3.3 volts out on the right one and the input to the board is 5.1v from the main powersupply. The Power supply also supplies 12.4 v to the inverter for the backlight power.
These were all good.
I checked all these for reference for benifit of others. I expected the problem to be the video input/connector/opens related because without the cable connected the monitor functions thus the voltages should be good and the cpu/brains should also be OK.
Either the unit didn't detect the vga signal or was being forced into standby by some means.

After dissaembling the unit the monitor begain to function again, and then wouldn't after I reinstalled into the case agian.
I then found that the VGA board would work/not work with a slight flexing/warping of the board. The mounting screws and two clips bend the board when it is normally in place. I was able to listen closely to the vga proccessor board as I flexed it an could hear the pins on the Main Chip crackle. I looked very closely with a magnifing glass and could see that the pins on the side toward the VGA connector were loose- probably this batch of boards had a poor solder proccess and the connections were faulty.

I reflowed the solder on the main chip on the side toward the vga connector. Be VERY VERY careful these a extremely small pins. Have "good" solder wick available for the removal of blobs.

The Monitor now is again working and flexing the vga board no longer affects the operation of the unit

Good Luck.

Posted on Sep 14, 2009

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Is there suppose to be a pin missing on both ends of monitor cord? iam trying to get my samsung 173s to work

Posted on Jun 04, 2009

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My 720N samsung monitor has the white backlight with color horizontal lines without picture.please help me about solving problem.

computer, vga board, cable, monitor
It is a process of elimination
I do not know how you have verified what you stated, but per your question you have checked everything.
If you changed the monitor and it works, then the old monitor is bad. If you are asking how to fix the old monitor, it is impossible to answer without a teardown.
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I have replaced the screen in my Easy Note TJ65 but the screen is still white

Did you diagnose first?

1) First thing to check is to make sure the graphics chipset is OK.

[Chip and Chipset are slang terms for I.C.
Integrated Circuit,

http://en.wikipedia.org/wiki/Integrated_Circuit

The I.C. for graphics is the graphics chipset, or more properly, the G.P.U.
Graphics Processing Unit,

http://en.wikipedia.org/wiki/GPU ]

A) Laptop OFF, monitor OFF, connect a VGA monitor to the blue VGA port, on the left side of the laptop.

You can use a CRT type of monitor (Looks like a small TV), or a flat LCD screen monitor if it has a VGA Cable,

http://en.wikipedia.org/wiki/VGA_connector

(Scroll down a little bit for example of VGA Cable)

B) Turn the monitor on. If a CRT type allow it to warm up a couple of minutes.
Turn the laptop on.
No display on external VGA monitor?

Hold the Fn key down, and tap once on the F8 key.
(The F8 key is the Display Toggle-Over key)

Still no? Hold the Fn key down again, and tap once more on the F8 key.

[There are at least 3 display options available;
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY ]

Good display on external VGA monitor = good graphics chipset.

Going on.
The problem is the Video Cable, or in the Display Assembly.

Small primer;
An LCD screen does not produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, (Or two of them), or a series of LED's.
(Light Emitting Diode)

A CCFL is a Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height.

The Packard Bell Easynote TJ65 uses LED backlighting.

A screen Inverter is used to convert the power (Electricity), from the laptop; for the LCD screen, and Backlight.
LED backlighting does not use a screen Inverter.

http://www.laptopscreen.com/Spanish/model/Packard%20Bell/EASYNOTE%20TJ65/

Primer over.

You are down to the Video Cable, since you have installed a new LCD screen.

The Video Cable connects to the motherboard either under an area, under the Keyboard; or under the Switch Cover.
It then leads across the motherboard, and through the left Hinge.

From there the Video Cable leads into the Display Assembly, and connects to the LCD screen, and LED backlighting.

Due to just normal repeated opening, and closing of the laptop; the Video Cable connections TO motherboard, and/or TO back of LCD screen; may become loose.

Connection at motherboard side needs to be physically checked; to ensure this connection is not the problem.

You also may not have made a good connection to the back of the LCD screen.

(And it would be logical to also check the LED cable connection, while you are at it. Even though a bad LED connection would cause a dark screen, and not a White one)

Also the Video Cable's sheath should be visually checked for obvious signs of damage.
Any apparent signs of damage to the sheath of the Video Cable; may also mean damage to the tiny wires inside the cable.
(Stretched/Broken)

In your situation you need to know for SURE, if the Video Cable is good. Video Cable should be removed, and a multimeter set to OHM's is used, to check continuity of every wire in the Video Cable.

An economical multimeter is around $5 to $12, if you do not have one. Or take to a small computer shop, and have it checked for a few bucks.

Video Cable checks out for continuity, and connections are Tight; you have a bad new LCD screen, or the wrong one.

For additional questions please post in a Comment.
Regards,
joecoolvette
0helpful
1answer

T42p display lights for a couple of minutes through startup then goes dark

But fan still runs, and it sounds like the harddrive is spinning?

Diagnose.

Do you have a VGA monitor available?
You can use a CRT type, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

http://en.wikipedia.org/wiki/VGA_connector

1) Laptop OFF, monitor OFF, connect the VGA monitor cable to the left side of the ThinkPad T42. (DisplayPort)

2) Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.

By factory default, the display should show on the external VGA monitor.
If not;

There are at least three display options available;
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY.

Press, and hold down on the Fn key, and at the same time tap once on the F7 key. The F7 key is the Display Toggle-Over key.

3) Good display on external monitor?
Problem is the video cable, or inside the Display Assembly.

Since the display goes dark after a couple of minutes, I can tell you the problem is the screen Inverter, or Backlight.
(Inside the Display Assembly)

90 PERCENT OF THE TIME the fault is a bad screen Inverter.

Primer:
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, or a series of LED's.
(Light Emitting Diode)

The Lenovo ThinkPad T42 series of Notebook PC's, uses a single CCFL for a Backlight,

http://www.screentekinc.com/IBM__ThinkPad__T42-series-laptops-lcd-screens.shtml

A CCFL is a Cold Cathode Fluorescent Lamp. (Bulb)
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

[Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height ]

A screen Inverter converts the power from the laptop, for the LCD screen, and Backlight.

(Older versions of backlighting that used a series of LED's, used a screen Inverter. Newer versions do not. For these replace the LCD screen)

A screen Inverter and an LCD screen are a MATCHED unit. Make sure you get the correct screen Inverter, or LCD screen, when buying.

Primer over.

One example of a screen Inverter for the T42's,

http://battery-adapter.com/product_info.php/products_id/3381/vThinkpad+T42

Pictorial guide for replacing a screen Inverter, in a ThinkPad T42 series of Notebook PC,

http://www.insidemylaptop.com/replace-screen-inverter-in-ibm-thinkpad-t40-t40p-t41-t41p-t42-t42p-laptops/

http://www.laptoprepair101.com/laptop/2007/01/31/replace-screen-inverter-fix-backlight/

Lenovo Support link to the Hardware Maintenance Manual, for the ThinkPad T42 series of Notebook PC's,
(HMM. It is a Service Manual),

http://support.lenovo.com/en_US/guides-and-manuals/default.page?

Click on the bold black subheading -
Hardware maintenance manuals
Then click on the blue -> [+] Click for files

It is a PDF file.
It may take up to 30 seconds before the first page comes up.

For additional questions please post in a Comment.
Regards,
joecoolvette
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THE STARTING WINDOWS IS NOT VISIBLE ON THE MONITOR BUT THERE IS SHADOWS CAN BE SEEN. THE POWER IS FUNCTIONING ALSO THE CPU.

LCD monitors have backlight (NEON / LED backlight), the screen will go dark if the backlight circuit / electronics or the backlight itself fails. Get it to a tech who will have spares for your LCD to get it replaced.
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Dark screen

Sounds to me as if the backlight on your LCD has burned out. Don't know if they sell the part you need without having to purchase a complete LCD screen. If you can get just the backlight by itself it will be whole lot cheaper.
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Connected power but hardly see the image all dark

Sorry about your Monitor problems.
I have worked on several of these monitors and yours sounds like the BackLight has gone for a walk. ( NG ).
If you are experienced in the disassembly and the electronic component repair, let me know, and I will walk you thru the repair steps.

The backLight for your unit, can be ordered on EBay or direct from Samsung.


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Looks like a "mechanical" problem (cold solder point possible or bad electrical contact)
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From your description of the issue, the LCD and or hte inverter has failed. If less than a year old, contact Princeton Digital for warranty repair, if outside 1 year, it is likely cheaper to replace than repair
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The video card in the computer could be going bad too or the driver for the video has corrupted. Try reloading the video drivers in the PC first.
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