Dell 1504FP Monitor year of Manufacture 2004

[matthmal]

Hi,

I have a Dell 1504FP Monitor which has no power. I have tried to open it and checked the caps but they don't seem bad to me. Please help me.

Attached please find photos of the monitor.

Thanks,
Matthew

[matthmal]

Re: Dell 1504FP Monitor year of Manufacture 2004

please find attached better pictures

[selldoor]

Re: Dell 1504FP Monitor year of Manufacture 2004

Has no power - means absolutely no voltages anywhere and no power led? Its too late for me to start looking - check your power cable and fuse if you have one- try another cable.
Power off test all the fuses there are 2 res barrel ones and I think a green torpedo but there may be more.
Next thing to check with the power on and it all connected Meter on VDC200 black lead on a ground screw test each pin on the connector that goes to the main board and post the results and if it says on the board what they should be post them as well.

Whilst the caps may not look bad they all appear to be a poor make.

[budm]

Re: Dell 1504FP Monitor year of Manufacture 2004

Check the two red round fuses, check the DC voltage on that large DC filter cap in the HOT side of the circuit so be real careful. Check the solder joints of that black AC inlet pins.

[matthmal]

Re: Dell 1504FP Monitor year of Manufacture 2004

Ok.... I have just noticed a leaked cap and replaced it. Now this monitor is turning on, it turns on with video for a few seconds and turns off again. Please also note that when it turns on instead of a black bios background there is a red bios background. The power button then turns to amber color.

[matthmal]

Re: Dell 1504FP Monitor year of Manufacture 2004

Check the two red round fuses, check the DC voltage on that large DC filter cap in the HOT side of the circuit so be real careful. Check the solder joints of that black AC inlet pins.

how can i check that with a normal multimeter?

[budm]

Re: Dell 1504FP Monitor year of Manufacture 2004

If it turns amber and the you have red tint on the screen, it means you have bad connection on the video cable, check both ends to make sure they are seated properly.

[matthmal]

Re: Dell 1504FP Monitor year of Manufacture 2004

but how come does it turn on for a few seconds with a red display ? the red display goes away after a few seconds and the power button turns to amber

[matthmal]

Re: Dell 1504FP Monitor year of Manufacture 2004

but how come does it turn on for a few seconds with a red display ? the red display goes away after a few seconds and the power button turns to amber

please not that the power button is remaining green now and with no display. If i turn the monitor off and on again the red display shows again for a few seconds.

Please also note picture 3 of my second post as it seems that there are other leaked components but I am not sure if they do make a difference.

[budm]

Re: Dell 1504FP Monitor year of Manufacture 2004

Those yellow/brownish glue must be removed, it is corrosive and conductive when it aged.

[matthmal]

Re: Dell 1504FP Monitor year of Manufacture 2004

can you please suggest something to remove the glue with? I don't thing that a contact cleaner will do right?

[budm]

Re: Dell 1504FP Monitor year of Manufacture 2004

I use Alcohol, you can trim them off first with cutter first.

[matthmal]

Re: Dell 1504FP Monitor year of Manufacture 2004

Ok will try that tomorrow and get back to you with the result. Hopefully after cleaning, it will work fine.

[selldoor]

Re: Dell 1504FP Monitor year of Manufacture 2004

It will be one problem less I looked at the glue but it did not look as bad as some I have seen. It flashes red because the information that cuts out the red is not being received at the panel so it flashes red instead of black. As budm has said it it usually due to a dirty or mis connected or damaged cable between the main board and the panel board.

If removing the glue does not fix the 2 seconds to black issue then you need to read this guide by retired caps. - It will help you with testing the other two as well.
Start at post 19. Once you get one panel to stay lit you should be able to test the panel light ccfls on the other two. Ruling out that as a problem.
https://www.badcaps.net/forum/showthread.php?t=10419

EDIT EDIT

You do not need to test the red barrel fuses nor the AC inlet
as because there is power they must be good.

Some Yageo caps are good enough others not so good - where do you order from - Can you use RS Online in the UK - quite a few members in
spain & portugal have said they are reasonable postage for small orders.

[Rtech]

Re: Dell 1504FP Monitor year of Manufacture 2004

Red or Pink ?????

[matthmal]

Re: Dell 1504FP Monitor year of Manufacture 2004

Hi,

So I replaced again the capacitor that was faulty, this time with a brand new one. The display is no longer becoming red, it gives a clear display for a few seconds until it turns off again but this time there is not sign of light on the power button.

I will look at the link that you gave me.

[selldoor]

Re: Dell 1504FP Monitor year of Manufacture 2004

One test you can do is to check the secondary windings on the inverter transformers. Power OFF meter on Ohms 2000 check S1 to S2 on each transformer and list the results.

[matthmal]

Re: Dell 1504FP Monitor year of Manufacture 2004

Can I test it on board or do I have to test it off the board? Do I have to leave the power on to test it?

By the way... I am buying caps from gemalta as I do live in Malta but obviously I can buy caps from you

[selldoor]

Re: Dell 1504FP Monitor year of Manufacture 2004

On Board - Power OFF (as I said?)

[matthmal]

Re: Dell 1504FP Monitor year of Manufacture 2004

will try it and get back to you. sorry i didn't understand that before