Dell E151fpb LCD, problems.

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FunnymanSE30's picture
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Well one of my teacher's gave me a 15" Dell 151fpb, and said if i fix it i can have it. The problem is that, i'll connect it to any of my computers with vga out, and it wakes up but doesnt display any picture. But while in this awakened state i'm able to use the on screen menus and things, and the menu comes in crystal clear and sharp, but it wont display any video being fed into it from the computer. any ideas on what might be the problem? i thought maybe the video wires in the vga cable may be broken, but this is the first lcd i've had not on a powerbook, so i dont know.

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Dell LCD E151FPb

I too was given one of these monitors which had a problem in that it would display OK for a minute or two and then the screen would go all white. I stripped it down and found a bad solder joint on the large board.
I suspect that the problem on Funnyman's monitor is either in the cable - which he can check with an ohm meter- or on the input board. This board has a large surface mounted chip on it, and if that is the problem he might get the board from BENQ who manufacture the board.
Good Luck.

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Re: Dell E151fpb LCD, problems.

FunnymanSE30 wrote:

Well one of my teacher's gave me a 15" Dell 151fpb, and said if i fix it i can have it. The problem is that, i'll connect it to any of my computers with vga out, and it wakes up but doesnt display any picture. But while in this awakened state i'm able to use the on screen menus and things, and the menu comes in crystal clear and sharp, but it wont display any video being fed into it from the computer.

I was wondering if you made any progress with this? I have a Dell 151fp that is showing the exact same problem. One day it was fine, the next it won't show any VGA signal, but the on screen displays work fine. I'm going to open it up and see if anything looks loose, but if you have any pointers that would be great.

FunnymanSE30's picture
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i've only got it to display r

i've only got it to display really dimly by going in the OSD to color settings and using user set and adjusting all colours to 100

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backlight?

if it shows something, but only dim, it's possible that the backlight is dead. either the lamp itself or the electronics controlling the backlight... !!???!

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If the OSD can be seen clearl

If the OSD can be seen clearly, then it can't be the backlight.

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ah, ok...

seems i've missed that one Wink

has been a real long night when i wrote that, sorry...

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so where can i get a replace

so where can i get a replace ment board, i cant find anywhere on benqs website

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just a note..

Monitors of course hold enough juice even after having been off for a while to make you lie down and be still for a long long time. Any work on a monitor must be done extremely carfeully. Not that you dont have the skills and not meant to talk down to anyone, I just feel compelled to mention it anytime I hear of someone opening up a case.

best

d

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even an lcd?

even an lcd? i thought that was only CRTs

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even an lcd?

Sorry! double post

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well as far as the backlight goes

that is high voltage, he might be refferring to that..

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Dell E151FPB Monitor

I was glad to see someone has seen this problem before I have this monitor and it was all white no display of any kind. I was about to throw this out, I read this post and found a loose solder joint at L781 on the power supply board. This seem s to be a pretty common problem with these from what I have seen on various places...

FunnymanSE30's picture
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I accidently fried my powerbo

I accidently fried my powerboard while trying to fix it, i need a new one because i'd like to use this LCD

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e151fpb loose solder at L781 worked

You guys rock. Thanks for saying where the loose connection actually was. I wouldn't have noticed it. I opened up my monitor, which would tun completely white if jiggled the wrong way, carefully removed the power board, found the inductor L781, and re-soldered the joint. So far it has worked like a charm. Thanks!

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Problems with Dell

Strange that so many people around have or have had problems with dell lcd monitors. My first monitor was Dell and I faced a whole bunch of problems with it as well. Now I trust samsung since it never let me down. I used to have 15" at first, then in a period of time wanted to have a bigger screen and found a smart syncmaster 21" 214T at an easy rate. The monitor performs perfectly.

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bad solder joints?

Which did you resolder?

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l781

I check this location, it looked ok but I resoldered it to make sure, that did not help, any other location I should try?

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opening it up

does anyone know how to open up the dell 151fpb?? I cant seem to figure out how to pop it open. Ive gotten all the screws out i can, but it still seems to be held together by something

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Yeah

Thanks for the help on the L781 information. I guess whenever my monitor was made pieces were loose or something so a bunch of glue was put on some of the conductors in my monitor, L781 being one of them. All I had to do was scrape off the glue and so far everythings back to normal.

As for getting the monitor opened, that was a tricky part. What had to do was take out the two screws at the bottom, the two screws holding the base together, the two screws sort of in the center near the bottom, take out the plate that was holding the base in which happened to hold one more screw to take out. After that I got my dads old drivers license and had to pry open the bottom corners slightly, just enough to push my license in a bit. Then I pretty much swiped all around the entire monitor to undo these little clips, because theres like 10 of the clips on the inside of the monitor holding it together. After that your monitor should be easy to split apart and then you'll need to unscrew a metal cover out to reveal what hopefully will show you what is wrong with your monitor.

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Re: Dell E151fpb LCD, problems.

FunnymanSE30 wrote:

a 15" Dell 151fpb, ...
i thought maybe the video wires in the vga cable may be broken, but this is the first lcd i've had not on a powerbook, so i dont know.

If you suspect a problem with your Dell E151FPb signal cable which carries the video signals (3 colour signals - Red, Green and Blue, plus other signals) then check out this recent thread on the Dell Commununity Forum - E151FPb - Signal Cable problems. Solutions?

It is a more difficult problem with the Dell E151FPb compared to some other monitors to fix as the signal cable is not user detachable at the monitor end.

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I actually used it for awhile

I actually used it for awhile the way it was for a terminal monitor on my Linux box(high contrast white text on black screen) but it was killed in a lighting storm in late july of this year, unfortunately there's now a large burn mark on the screen's analog board.

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Dell E151fpb LCD, regards to inductor L781

Found a Dell E151fpb LCD computer monitor on top of the recycling bin cover several days ago and found out why (It does not turn on/off properly).I carefully removed the covers. Found it very clean inside.After a checked it carefully. I made sure everything was connected and secured then I turned on the power to the monitor (the "Dell Self Test Feature Check {Red Green Blue White}" was floating around similar to a screen saver. When I turned the Dell E151fpb LCD off & then on; a white screen appeared and that was it. After many hours I carefully set it aside (stored the covers and related parts it a cardboard box (14" x 18" x 3-1/4"). I searched the internet many times. On 9/3/2008 about 6:14PM while I was using the Goggle search engine and it directed to this web site (http://www.applefritter.com/node/18226)I read many of the post on this web page. I then removed the power supply board and looked for inductor L781 and found it. The inductor had a lot of glue on it. I removed the solder from inductor L781 and resoldered it with a good grade of solder. I careful checked the connections and repaired as needed.I reinstalled the power supply & carefully reinstall the tiny board that has five connections. I then applied 120 volts to the LCD monitor and turn it on and the "Dell Self Test Feature Check" was working like a screen saver. I turned it on/off for a half dozen times and it worked ok so far so good. I turned the monitor power off and disconnected the CRT from the computer and connected the Dell E151fpb LCD monitor to the computer and then turned on the Dell E151fpb LCD monitor and it works great. I then turned the monitor off and disconnected it from the computer and reinstalled all the metal covers and the plastic covers. Reconnected the Dell E151fpb LCD monitor to the computer and restore the 120 volts AC to the monitor and turn it on and it works great. Many thanks for getting my recycled Dell E151fpb LCD monitor working so I can use it. Thank You

Troubleshooting: Dell™ E151FPb Flat Panel Color Monitor User's Guide
http://support.dell.com/support/edocs/monitors/E151FPB/En/trouble.htm

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E151PFB

You guys can chalk up another one. I've had this monitor in the back of the closet for almost a year. After reading these posts, I hauled it out, opened it up and resoldered the 2 pins on L781. IT WORKS!!

Thanks to all. Like the other one said, you guys rock!

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Why the pins on L781 don't so

Why the pins on L781 don't solder good.
Here is the reason there are so many problems with the solder joints on L781 with the Dell E151fpb LCD monitor.

The coil that is cemented to the board is wound with MAGNET WIRE. This wire is not insulated, but it does have a coating of LACQUER on it. To make a good solder connection, the lacquer must be sanded or scraped off. So, when you guys fix these monitors, please scrape the little protruding piece of wire with your pocket knife before you solder. That way, the solder will adhere and you will be back in business. You need to use a low-watt soldering iron to avoid damaging the board. 15 or 20 watts works fine.

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Thanks for the help!

I purchased a Dell E151FPB for $15 at a yard sale yesterday, only to get home and discover all it would do is display a white screen. A Google search led me to this post.

With the help of a friend, I disassembled the monitor, and by golly, L781 had a bad solder joint. We re-soldered the connection, and now the monitor works like new!

Thanks for the help, everyone!