Dell E153FPB Back Light problem

[retiredcaps]

Re: Dell E153FPB Back Light problem

I have a E153FPB with a blurry display.

Reseat and clean all your connectors with isopropyl alcohol.

[jschiefer]

Re: Dell E153FPB Back Light problem

I have a E153FPB with a blurry display. I am not sure where to start because it is only blurry with the VGA input. If I have a signal coming in and click the menu button, the menu looks fine, but the backgroud VGA input is blurry. It almost looks like I can see the progressive scan. My first guess is the actually logic board for video input. What do you guys think... thanks for the help

[lcdman]

Re: Dell E153FPB Back Light problem

Hello & Happy New Year To All,

Can anyone give me a pinout for CN701 on the e153fpb (48.L0H02.A00).
I'd like to test for output voltages to logic board.

Thanks In Advance,
lcdman

[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.

Many thanks to the forum and all those who've contributed here!

[bcstedt]

Re: Dell E153FPB Back Light problem

1) You MUST resolder all the inverter transformer pins due to poor quality solder/soldering. A visual inspection may seem fine, but you MUST resolder them.

Oh you are SO right! Further inspection of the four inverter transformers joints (while slightly flexing the board) reveals at least five circular fractured joints.

2) Check all c5707s and fu9024s for shorts.

There were only four c5707s (two bad, two good). Did not see fu9024 but the other transistors seem to check out.

Thanks!

[bcstedt]

Re: Dell E153FPB Back Light problem

If you add a photo, perhaps we can see if it is an E173 OR an E153, which you have filed this under ???

The monitor model is an E173 (as stated in my post).

[retiredcaps]

Re: Dell E153FPB Back Light problem

Anything else I should check while I'm waiting?

1) You MUST resolder all the inverter transformer pins due to poor quality solder/soldering. A visual inspection may seem fine, but you MUST resolder them.

2) Check all c5707s and fu9024s for shorts.

[Rtech]

Re: Dell E153FPB Back Light problem

If you add a photo, perhaps we can see if it is an E173 OR an E153, which you have filed this under ???

[bcstedt]

Re: Dell E153FPB Back Light problem

New member here (2nd post).

I'm working on a Dell e173fpb that would not power up. The power switch/light would repeatedly blink and each time you could see a short burst of backlighting from the lower-left corner (two clues).

After pulling it apart, giving the boards a visual once-over and finding this post I checked the fuse (FP751) which seemed fine (jumping it caused no change). Next I tested the Q7x0 and Q7x9 transistors and found two (same side) that seemed shorted. After desoldering them I now have a monitor that functions on two lamps but only for a few seconds (screen appears then monitor shuts off, restarts OK). I've ordered a repair kit and will try to come back with an update after I've replaced the two transistors.

A close visual inspection of the boards (both sides) reveals nothing out of place. I'm about half-way through reading this thread so there may be some nuggets that I haven't found yet.

Anything else I should check while I'm waiting?

Cheers and thanks everyone!

[EGuevarae]

Re: Dell E153FPB Back Light problem

Do not use a heat gun. Just use a regular soldering iron to remove the old solder and add fresh new solder.

I agree. The idea is to change the solder,not re-melt it.
Reflowing applies to another kind of problems,mostly with BGAs.

And don't worry about the "great resistance" thing.Here besides helping each other,we have fun....
And about the non-English native thing,don't worry...My native language is Spanish and I've managed to get along pretty well so far (I think) ....

[retiredcaps]

Re: Dell E153FPB Back Light problem

i was thinking about doing a reflow of the solders using a heat gun

Do not use a heat gun. Just use a regular soldering iron to remove the old solder and add fresh new solder.

[rukirie]

Re: Dell E153FPB Back Light problem

Hi again,

Thanks for the advice. I will do that.

i was thinking about doing a reflow of the solders using a heat gun (using my infrared thermometer to gauge temperature of the PCB). I fixed an IBM laptop that way (the one I'm using to type this).

Best regards,

Eric

ps. Sorry about the picture and the 'great resistance' thing was not meant to be funny, I am not a native english speaker and things can get warped in translation. I meant infinite resistance.

e.

[smason]

Re: Dell E153FPB Back Light problem

???

At least it wasn't shorted.

[EGuevarae]

Re: Dell E153FPB Back Light problem

I measured great resistance over the PF751 fuse, an indication of a blown fuse, ...

???

[PlainBill]

Re: Dell E153FPB Back Light problem

Hi all,

I just wanted to share my experience:

My father-in-law had a Dell 153FPB that 'died', i.e. had no backlight.
I saw it flash a bit when I plugged it in so I decided to google a bit to see if these things had a common point of failure (usually bad caps in my experience).

Fortunately, I read this forum and that pointed my attention to the PF751 fuse, not very obvious for an amateur like me I must confess.

I measured great resistance over the PF751 fuse, an indication of a blown fuse, so I replaced it with a 2A slowblow fuse and lo and behold!
We have a backlit image again! I hope the new fuse holds.

Thanks for the groundbreaking work,

Eric Benedikz

ps.saw this picture of the culprit:

Important!!! Resolder all inverter transformers or you will be replacing the fuse again. And some transistors.

For future reference, note the links in my signature on the proper way to attach pictures.

PlainBill

[rukirie]

Re: Dell E153FPB Back Light problem

Hi all,

I just wanted to share my experience:

My father-in-law had a Dell 153FPB that 'died', i.e. had no backlight.
I saw it flash a bit when I plugged it in so I decided to google a bit to see if these things had a common point of failure (usually bad caps in my experience).

Fortunately, I read this forum and that pointed my attention to the PF751 fuse, not very obvious for an amateur like me I must confess.

I measured great resistance over the PF751 fuse, an indication of a blown fuse, so I replaced it with a 2A slowblow fuse and lo and behold!
We have a backlit image again! I hope the new fuse holds.

Thanks for the groundbreaking work,

Eric Benedikz

ps.saw this picture of the culprit:
http://s807.photobucket.com/albums/y...g=Dell+E153FPB

[josh_zedlav]

Re: Dell E153FPB Back Light problem

hi tnx for the reply.. can you tell what is the proper way of checking the bulbs? another problem i encountered is that I cannot push the button while the lcd is on this mode.. It only took seconds to turn on and off.. then long minutes on then off again

[EGuevarae]

Re: Dell E153FPB Back Light problem

Hi Folks I'm New here I need help regarding may Dell E153FB.. I've been working on my monitor for almost 3 days.. I tried all i have read from this forum like changing the 4 transistors, resoldering the transformers and other components, and changing the fuse.. It's just that it still keep on turning on and off.. Any possible solution you can give guys? thanks in advance

Caps?

[retiredcaps]

Re: Dell E153FPB Back Light problem

It's just that it still keep on turning on and off.

How long does it stay on? 2 seconds? 2 minutes? 2 hours?

[Welchs101]

Re: Dell E153FPB Back Light problem

Have you checked the "bulbs"?

If its turning on and then abruptly turning off then you might want to check the bulbs.