Dell E153FPB Back Light problem

[jschiefer]

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

[paslug]

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

[retiredcaps]

Originally Posted by jschiefer

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

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

[jschiefer]

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]

Originally Posted by jschiefer

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]

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]

Originally Posted by jschiefer

The problem was the cable.

Glad it was an easy fix.

[jesusbaqui]

Originally Posted by brianh

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

[larry256]

can i replace fu9024n with c5707's

[Rtech]

Originally Posted by larry256

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

[alihomee]

thanks for this post i tried it and it works

[bcstedt]

Originally Posted by bcstedt

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!

[halobender]

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.