Question about Dell 1503FP 15" LCD Monitor

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Works for a few minutes then shuts down

There three leds on the front panel, the power led and a 1 and a 2 numbered led. when the adapter is plugged in the monitor will come on, without pressing the power button. The one and two leds will alternate a couple of times, then the one led will stay on steady. The monitor will work for a little bit and then shut off, all leds off. Monitor displays the test pattern when working.

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  • Matt Parish Nov 24, 2007

    i have the same problem. sometimes it will work fine, but if you unplug the power lead, it won't work again! i replaced the PS thinking it might be that, but still have the same problem. unplugging it in and out many times does the trick sometimes! Any ideas??

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Hi Mark, Thanks for the suggestion but unfortunately every component on the board is surface mounted. Nothing looks burnt out or dry though. I havent used the screen for at least a year. I just turned it on and now all that happens is that the two led's on buttons 1 and 2 come on and stay on. there is a breif flash from the back lights, and thats it. Any more suggestions?? Matt

Posted on Apr 08, 2008

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You both have a collection of dry solder joints and or bad capacitors. Check for any sign of buldging capacitors on the power supply board and replace as needed with the exact same values.
The dry joints in the solder are normally around the larger items on the board like transformers etc and places that alot of heat builds up. Check the regulators and other area's near there, and also check areas that sit above them when the monitor is in normal operating mode..hot air rises..too bad electrical engineers work on flat screens =)

Good luck to you both.

Posted on Apr 08, 2008

  • Peter Thompson
    Peter Thompson Apr 08, 2008

    I know this will sound like a stupid question, but have you completely removed the board from the housing?



    I have several of these here now and although they are surface mount on the back, they are all caps and standard components on the top side.



    To make it worse, the power board is a BenQ component.

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I have a Sharp 70" (LC-70LE632U) LED TV. When you turn it on, the front led is on, but no screen. After a few seconds, the front led starts 5 short and 2 longer blink and continue this way constantly.


These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices
http://electro-medical.blogspot.com/

Blinking codes details of many popular brand TVs are given. Surf the site with patience. If blinks continue without any pause, the main board is faulty.
Counting of number of blinks to Philips TVs is entirely different to that of other brand TVs. It is not a direct count procedure. The site have details about how to count the number of LED blinks [Fault Codes] to Philips brand TVs are given; along with details of the faulty circuit location

Nov 12, 2015 | Sharp Aquos LC-70LE632U 70 Inch 1080p...

1 Answer

New Viewsonic LED monitor displays No Signal on two refurbished Dell 2950 servers (both front and back VGA adapters embedded on motherboards) but monitor works plug & play on three different laptops....


Well you ruled out the monitor
Most server have a detail error report system in most cases shows combo of led lights that tells you what its doing and where it is hanging
I sugest to find a manual on it and see if it goes to the post without a hitch

Mar 13, 2015 | Dell Computers & Internet

1 Answer

Dell 25UXR A12870-408 Socket 370 ATX RDRAM Motherboard front panel diagram


http://www.ebay.com/sch/sis.html?_nkw=Asus+TUV4X+Socket+370+Motherboard+6+PCI+PIII+1GHz+CPU+

I put Dell 25UXR A12870-408 in my browser search bar, in the hopes of seeing the motherboard, and the Front Panel header.

The above was the best search hit I got.

Ebay is a little whacked with their search engine, sometimes; but the above made me wonder.

Why would you list the Asus TUV4X ,along with the Dell motherboard I am looking for?
Probably just their search engine trying to advertise anything close.

Motherboards do not seem to be the same, except they all use a Socket 370 processor socket.

So out of curiosity, I would like you to look at the Front Panel header, on an Asus TUV4X,

http://www.ebay.com/itm/ASUS-TUV4X-Socket-370-Motherboard-W-SL52P-800Mhz-CPU-Heatsink-M425-/251197524658?pt=LH_DefaultDomain_0&hash=item3a7c8a0ab2

Set your mouse cursor in the middle of the photo, to use the
Zoom In feature.
Now move all the way to the right, to the right of the bottom white PCI slot.

Immediately above that bottom PCI slot, is a row of pins.
You can almost make out FRT_PANEL.
(Of course I'm using a 26 inch HDTV for my main monitor, and that helps, lol!)

What my question is, are the pins in a row/s like that on yours?

Oh, photo of the Dell 25UXR?

http://www.ebay.com/itm/Dell-25UXR-A12870-408-Socket-370-ATX-RDRAM-Motherboard-PIII-SL4C8-1-0-GHz-CPU-/190754347389?pt=US_Motherboard_CPU_Combos&hash=item2c69d8597d

Yes, even with this large monitor, THAT photo does me no good.
(RCA L26HD31. I'm using dual monitors. Also using HP 2009M)

If the Front Panel header pins are arranged like that, I believe we can use the old process of elimination.

Looks like an 18 or 20-pin header.
Some of those pins are used for a speaker. (Guessing)
Some of those pins are Not used. (Not guessing)

The procedure is to have the Power Supply plugged in, then use an LED light to test with.

Old Power On LED, or Harddrive activity LED, whatever.
Just needs to be a TWO wire LED.

Let's number the pins.
Let's say they are numbered ODD for the Top row, and EVEN for the Bottom row.
I don't know where Pin 1 is. Should be a 1 silkscreened on the motherboard, next to Pin 1.

For this example let's say it is on the Top row, and all the way to the LEFT.
That would make the Top row pinout, from LEFT to RIGHT;
Pins 1, 3, 5, 7, 9, 11, 13, 15, 17, and 19.

Bottom row, from Left to Right;
Pins 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20.

My thinking is to touch the two wires from the LED, to Pins 1 and 3.
Power Supply doesn't come on?
Go to Pins 5 and 7.

Go along the Top row, then go along the Bottom row; in this fashion.
When you get to the 2 pins for the Power On switch, there will be a tiny spark, and the Power Supply will come on.

Using an LED light you cannot cause any harm to the motherboard.
HOWEVER, the Power On switch is a Momentary Contact Switch.

Do NOT keep the LED wires on the Power On switch pins, more than 2 seconds.

Power Supply on, and running.

Now, touch two pins, and the LED blinks?
HarDDrive activity LED light.

LED stays on?
Power On LED light.

Computer restarts?
Restart switch pins.

Usually it will be the first 8 pins that will be used.
4 on the Top row, 4 on the Bottom row.

Post back in a Comment.

Regards,
joecoolvette

Mar 10, 2013 | Computers & Internet

1 Answer

MSI 760gm-p21(fx) MB, JFP1 AND JFP2 PINOUTS I NEED TO SEE A DIAGRAM SHOWING ME EXACTLY WHERE TO PLUG the cables on the MB


http://www.msi.com/product/mb/760GM-P21--FX-.html

Hover your mouse cursor on the Download tab.
(Overview/ Specification/ Download/ Support/ Where to Buy)

In the drop down list click on - Manual
On this page under the subheading Download, click on the blue -
M7641v3.0.zip
On the next page click on the country name nearest yours.

Motherboard User Manual.

This is a Zip file. If you do not know how to open a Zip file, please state in a Comment, and I will guide you.

The front of your computer is the Front Panel.
The area of contact pins on the motherboard, that the main wires from the Front Panel go to, is the Front Panel header.

The Front Panel header is divided into two headers on the motherboard.
This you have stated, JFP1 and JFP2.
(Junction Front Panel 1, and Junction Front Panel 2)

JFP1 is for the Power On switch, HarDDrive activity LED, Reset Switch, and a two wire Power On LED.

JFP2 is for an internal speaker/buzzer, and a three wire Power On LED. (Dual color)

JFP1:
4 pins across the Top row.
5 pins across the Bottom row.

The pins on the Top row are numbered EVEN.
The pins on the Bottom row are numbered ODD.

Starting on the LEFT side coming across to the Right side, Top row;
Pins 2, 4, 6, and 8. There is NO pin 10.

Starting on the LEFT side coming across to the Right, Bottom row;
Pins 1, 3, 5, 7, and 9.

A) Pins 1 and 3 are for the HarDDrive activity LED.
Pin 1 is for the Positive ( + ) wire.
If the HDD LED is dim when the Harddrive is active, switch the wires around.

B) Pins 5 and 7 are for a Reset switch, IF a Reset switch is used.

C) Pin 9 is N/C. Not Connected. It is reserved for the factory to use.

D) Pins 2 and 4 are for a two wire Power On LED.
Pin 2 is for the Positive ( + ) wire.
If the PWR ON LED is dim when the computer is on, switch the wires around.

E) Pins 6 and 8 are for the Power On switch.
F) There is NO pin 10.

JFP2:
4 pins across the Top row.
3 pins across the Bottom row.

The pins on the Top row are numbered EVEN.
The pins on the Bottom row are numbered ODD.

Starting on the LEFT side coming across to the Right, Top row;
Pins 2, 4, 6, and 8.

Starting on the LEFT side coming across to the Right, Bottom row;
Pins 1, 3, and 5. There is NO pin 7.

A) Pins 1, 3 and 5 are for a dual color Power On LED.

Pin 1 is for the Negative ( - ) wire.
Pin 2 is for a Yellow, or Orange part of the dual color Power On LED.
Pin 3 is for a Green part of a dual color Power On LED.

B) Pins 2, 4, 6, and 8, are for a speaker/buzzer.

Pin 2 is for the Negative ( - ) wire of a speaker.
Pin 8 is for the Positive ( + ) wire of a speaker.

Pin 4 is for the Positive ( + ) wire of a buzzer.
Pin 6 is for the Negative ( - ) wire of a buzzer.

For additional questions please post in a Comment.
Regards,
joecoolvette

Jul 28, 2012 | MSI Computers & Internet

1 Answer

How do i plug the leds in Gigabyte GAP67AD3B3?


The front of your computer is the Front Panel.

The area of contact pins on the motherboard, that the main wires from the Front Panel go to, is the Front Panel header.

Motherboard installed in computer case; Processor to the TOP,
Ram Memory slots to the RIGHT, long PCI slots to the BOTTOM, the Front Panel header is at the Bottom/Right corner.

Two rows of pins, may have F_PANEL silkscreened next to it on the motherboard.

The TOP row of pins is numbered EVEN.

From the LEFT side of the motherboard, going towards the RIGHT side, across the top row of pins;

Pins 2, 4, 6, 8, (NO pin 10, NO pin 12), 14, 16, 18, and 20

The BOTTOM row is numbered ODD.

From the LEFT side of the motherboard, going towards the RIGHT side, across the Bottom row of pins;

1, 3, 5, 7, 9, 11, (NO pin 13), 15, 17, and 19.

A) Pins 2 and 4 are for the Power On LED.
IF, the LED is dim when the computer is on, switch the wires around.

These pins are used for a Power On LED, that has TWO wires.
It is a single color LED.

B) Pins 6 and 8 are for the Power On Switch.

C) Pins 14, 16, 18, and 20, are for the internal speaker. The speaker used for BIOS Beep Codes.
Pin 14 is for the Positive ( + ) wire. Pin 20 is for the Negative ( - ) wire.

D) Pins 1 and 3 are for the HarDDrive activity LED.
Pin 1 is for the Positive ( + ) wire.
If the HDD LED is dim when the harddrive is operating, (Active), switch the wires around.

E) Pins 5 and 7 are for a Reset Switch, IF a Reset switch is used.

F) Pins 9 and 11 are used for a Chassis Intrusion Switch.

G) Pins 15, 17, and 19 are used for a Power On LED.
These pins are used for a Power On LED that has THREE wires.
For a Power On LED that is dual color.

For additional questions please post in a Comment.
Regards,
joecoolvette

Jun 27, 2012 | Gigabyte GAP67AD3B3 Motherboard Intel Core...

1 Answer

I have purchased a Thermaltake V3 black case and am trying to install my M2N68-LA motherboard. The motherboard has a combined 9 pin header for power switch, power l.e.d. and hdd l.e.d. which was one plug...


1) The 9-pin header you are referring to, is the Front Panel header.

(Processor to the top, Ram Memory slots to the right, the Front Panel header is at the bottom right corner on the motherboard)

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00906129&lc=en&cc=de&dlc=&product=3397528

The plastic piece on the front of your computer is the Front Panel.
(Sometimes referred to as a Bezel)

Make a drawing, and notes as to where the individual wires go from that Front Panel header plug, (One-piece plug), to the Front Panel.

Follow the wires from the plug to the Front Panel.

Mark down where Each wire goes.

You may have to take components off of the Front Panel, in order to see exactly where Each wire goes.

For example:
You may have to remove the Power On button/switch assembly from the Front Panel.

It may have the Power On LED light, Power On button, (Switch), and perhaps the HarDDrive LED activity light, in this assembly.

The wires are color coded.

Generally, but not always, when two wires are used in conjunction with each other, (Example, Power On switch, or Power On LED light), the wires will be twisted together.

One wires insulation may be of a solid color, and the other wire may be white, with a stripe in the color of the solid wire.

Example: Wire with Red color, and wire twisted with it may be White, with a Red stripe.

See if these two wires go to the Power On switch.
End of example.

Follow each twisted pair of wires back down to the Front Panel header plug.
(One-piece plug)

See which socket holes the individual wires go to.
Mark it down in your drawing, and notes.

Mark where the individual socket holes plug onto each pin, in that Front Panel header. (9-pin header)

When you are finished, you will have a pinout for the Front Panel header on the Asus M2N68-LA motherboard, and will know where the individual wires go from your ThermalTake V3 computer case.

For the LED lights there is a Positive pin, ( + ), and a Ground pin. (Power On LED, and Harddrive activity LED, for example)

(Ground. Also referred to as the Negative pin. ( - )
This is DC Voltage)

If you have the polarity backwards, (Positive wire of the LED light is going to the Ground pin, Ground wire of the LED light is going to the Positive pin), the LED light will be dim.

(When operating)
Switch the wires around.

If you have questions, or need clarification of what I have stated above, simply state in a Comment.
(Believe upper right of your page)


Jul 01, 2010 | ASUS Computers & Internet

1 Answer

I need to know where to connect the three seperate 2 pin connectors from the ''power switch'' to the motherboard on my eMachines C2685 desktop computer.


The eMachines C2685 uses an FIC VC37GV motherboard. (First International Computer, Inc.)

http://www.motherboards.org/mobot/motherboards_d/FIC/VC37GV/

Here is the motherboard manual,

http://www.ime.org.uk/pdfs/vc37_vg31_b1_eng.pdf

After you click on the above link, give it up to 30 seconds to download. This is a PDF file.

Barring you cannot download the file, I will state the connections for the Front Panel header on the motherboard.
(Plus state the page to reference to, in case you can download)

View the first link, with the photo of the FIC VC37GV motherboard.

As shown, Processor is at the top, Ram Memory slots are to the right.

The Front Panel header is located at the very bottom right corner.

It is parallel to the outside edge of the motherboard. There are two rows of pins.
(Page 12)

The Front Panel header has 5 pins going across the top, and 4 pins across the bottom.

The top row of pins are numbered Odd.
The bottom row of pins are numbered Evenly.

On the Top row starting on the Right side, going towards the left, the pins are numbered 1, 3, 5, 7, and 9.

On the Bottom row starting on the Right side, going towards the left, the pins are numbered 2, 4, 6, and 8.

A) Pins 1 and 3 are for the HDD LED. (HarDDrive activity LED)

B) Pins 5 and 7 are for the Reset switch

C) Pins 2 and 4 are for a Dual Color Power On LED, if used.
Green goes to Pin 2. Yellow goes to Pin 4.

Otherwise Pin 2 is Positive, ( + ), and Pin 4 is Negative. ( - )

D) Pins 6 and 8 are for the Power On switch.
(PWR1, or SW1)

There is a small 3 pin header, just above the Front Panel header. (Page 12)

This is for a Power LED that has either two wires, or three wires.
The pins are numbered from Right to left.

Pin 1 is for the Power LED, and Pin 2 is for Ground, if using a two wire Power LED. (Not dual color)

Pin 1 is for the Power LED, and Pins 2 and 3 are for Ground (GND), if using a three wire Power LED.
(Page 13)

May 26, 2010 | Computers & Internet

1 Answer

Front panel to motherboard, ASRock P4i65G, connections


the power switch is on the 3 and 4 pins....the 7 and 8 pin are the reset pins. Trying it on wrong pins just won't startup the board but won't short circuit anything.

Jul 28, 2009 | Computers & Internet

1 Answer

Monitor will not power on


In front the LED should come on oarnge even without the macbook when pressing the power button, if you have a meter check that the adapter measures 12V.

If it does, check the mainboard capacitors and diodes and the inverter, follow the voltage from the adaptor plug.

Feb 18, 2009 | Princeton Digital VL1716 17" LCD Monitor

1 Answer

All three LED's blinking, no video


hi, does the three lights blink only after u connect it to a display card??if yes then check if any of the connecter pins are damaged, or check out the display card..bye let me know

Dec 08, 2007 | Dell E173FP 17" LCD Monitor

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