Dell E153FPB Back Light problem

[halobender]

Re: Dell E153FPB Back Light problem

Anyone having issues with this model should try adjusting the pot on the back of the panel. All fuses, caps, xr's all tested good for me so I tried adjusting the pot and sure enough I went from a screen that would turn on for a moment then go black to a monitor with a screen that stays on. Remember small turns on the pot and I recommend doing it while powered up so you can see changes live.

[bcstedt]

Re: Dell E153FPB Back Light problem

Repair kit arrived yesterday and after re-soldering all four Xformers (bent the leads out for better electrical / mechanical connection) and replacing two c5707 Xsistors it is back up and running. Will burn it in for a day, but so far so good.

Just wanted to say that everything is still working fine since the fix. Thanks again for the support!

[alihomee]

Re: Dell E153FPB Back Light problem

thanks for this post i tried it and it works

[Rtech]

Re: Dell E153FPB Back Light problem

can i replace fu9024n with c5707's

NO, the FU is a P channel mosfet,you could use 2SJ598,FQU11P06,BUT NOT the 5707's

[larry256]

Re: Dell E153FPB Back Light problem

can i replace fu9024n with c5707's

[jesusbaqui]

Re: Dell E153FPB Back Light problem

Ahhh - finally I've found the problem!!!!

After a lot of trial and error I have the CCFL lamps back on!

I won't keep you in suspense any longer... The problem was a blown fuse!

No... not the big white one, it was a little black one labeled PF751 (see previously posted photo if you're interested - it's on the right side and looks more like a rectifier diode).

I can read the letters "MS 2A" on it - so I guess that means that it's a 2 amp fuse. Someone else posted a schematic for a similar Diamond View monitor, which shows a 3 amp fuse. (ref: Inverter Schematic )

I've jumpered the fuse with an extremely fine strand of wire, and the CCFL now comes on. I'm giving it a burn-in-test right now. So far 1/2 hour and all is well.

I am, however, not willing to call it "fixed" yet - after all... Why did the fuse blow in the first place?

Sure... I plan on putting in a proper fuse, but I don't want to re-assemble it and have it blow another fuse (or worse) in a day or two.

But hey... after way too many hours on this project - at least I've got something positive!

Any thoughts?

Thanks man , you save me
i was thinking about buy another monitor

[retiredcaps]

Re: Dell E153FPB Back Light problem

The problem was the cable.

Glad it was an easy fix.

[jschiefer]

Re: Dell E153FPB Back Light problem

Well I hate to admit this but I guess it will be good for the forum. The problem was the cable. I tried a brand new one and it works fine now. I tried the old one on another set up and it is fine too. I guess this monitor is just a little more sensitive than others. (and I have two "bad" cables).

Thanks for all your help.

[retiredcaps]

Re: Dell E153FPB Back Light problem

I'll try another cable.

That reminds me of another thread. Try to get a quality thick shielded cable. One person has those cheap thin cables and when he replaced it, the problem went away. Unfortunately, I don't remember which thread it was or what the original symptoms were.

[jschiefer]

Re: Dell E153FPB Back Light problem

I'll try another cable. I'll grab a new one from work. Maybe I have two bad ones and my other source isn't as sensative. I'll take a better picture of the molecular connector later.

[retiredcaps]

Re: Dell E153FPB Back Light problem

Is that (4th) pin, the yellow one, supposed to be 0v?

I don't know. The legend is obscured in the picture.

[paslug]

Re: Dell E153FPB Back Light problem

Jschiefer, Did you try a different vga cable?

EDIT: Sorry, I just reread your post where you said you tried a different cable and source. My Bad

Ray

[jschiefer]

Re: Dell E153FPB Back Light problem

Is that (4th) pin, the yellow one, supposed to be 0v?

[retiredcaps]

Re: Dell E153FPB Back Light problem

I think these are okay after looking at the datasheet.

Yes, they are okay.

The voltages didn't change when the monitor is more blurry than times when it is not.

Well, I'm out of ideas.

[jschiefer]

Re: Dell E153FPB Back Light problem

Okay, I got the measurements. I apologize. I didn't mean for it to that long, something came up.

Anyways the numbers on the chips are:
AIC 1084-33CM 584G3 (larger one) PDF Datasheet
BS18532G3 (smaller one) Maybe the end is 63? I couldn't find any information on this chip.

The first chip, (1084-33CM)
0v --- GND
3.26v --- Vout
4.69 --- Vin

The second, (BS18532G3)
0v ---
1.77v ---
3.24v ---

I think these are okay after looking at the datasheet.

Here is the molex connector coming from the PSU board to the video board.
Starting with the yellow pin at the (top)
Y-2.97
Y-2.89
Y-11.66
Y-0 ???
Y-5.05
R-0

I checked these measurements twice, and with a second meter. They are within .01v. The voltages didn't change when the monitor is more blurry than times when it is not.

[retiredcaps]

Re: Dell E153FPB Back Light problem

There are 2 voltage regulators on the main/logic board.

1) List the part numbers off the chip.

2) With your multimeter, measure the DC voltage of each pin with respect to ground.

3) When the problem occurs, re-measure the DC voltage on each pin.

4) When the problem occurs, also measure the DC voltage of each connector pin between the power and logic board (yellow/red cable).

We are looking for any fluctuation in DC voltage to see if this is causing the monitor to flicker.

[jschiefer]

Re: Dell E153FPB Back Light problem

Okay, Here are some pictures. I took a bunch and these are the best. Hope they work. I had to resize them, I hope I didn't lose too much quality.

[retiredcaps]

Re: Dell E153FPB Back Light problem

Take it apart and post some pictures following the instructions in my sig file (earlier post).

[jschiefer]

Re: Dell E153FPB Back Light problem

Also, When I hit the menu, the display stops flickering for the 2 seconds it takes for the menu to come up, then continues.

[jschiefer]

Re: Dell E153FPB Back Light problem

Reseat and clean all your connectors with isopropyl alcohol.

Okay, I tried that and it didn't work. I also tried a different cable and source. It has come to my attention that the longer the monitor is on, the worse it gets. It changes from blurry to lines running horizontally flickering up and down the monitor. I tried to take a picture but that did not do any justice.