Dell E178FPb - white screen

[cjmclellen]

Re: Dell E178FPb - white screen

not even fit for the vip room.POOF!

[cjmclellen]

Re: Dell E178FPb - white screen

much nonsense snipped...

[EGuevarae]

Re: Dell E178FPb - white screen

Oh damn it! I posted to the wrong forum.

He he.
Just kidding guys.

Try operating your panel under water,
it will remedy the intermittent issues you are having.

Not funny and out of place.
You should try to breathe underwater, I guess it will solve the dumb posts you do ...

[cjmclellen]

Re: Dell E178FPb - white screen

byebye troll

[EGuevarae]

Re: Dell E178FPb - white screen

...... embarrassing MYSELF .....

Congratulations. You made it!

...Forgive me, I forgot about the possibility of you not using your own picture...

I apologize for not using my own picture. I guess your avatar is your real picture. At least it is brainless, so it might be related in some way .....

...maybe that's the main character in your favorite video game....

In fact it is. I apologize for thinking you are a complete idi... never mind, I guess you just got lucky on that one.

Except I'll get in my car and drive to your house and beat the living shit out of you if you talk to me like that again.

In your dreams.

Please post something either useful or at least funny. No, I'm sorry. You should not post at all. We all get along pretty well here.

[kc8adu]

Re: Dell E178FPb - white screen

problem fixed.
now back to the o.p's issue.

[Topcat]

Re: Dell E178FPb - white screen

^
Wow, what got up his ass!

In the 7 years this forum has operated, that was the first non-spammer troll we've had to ban! Bring a tear to the eye!

Resume fellas, sorry for the interruption!

[Scenic]

Re: Dell E178FPb - white screen

Capxon GL is replace on sight (like fuhjyyu), white display problem and it being intermittent sounds like a flex cable issue or the Genesis controller not getting it's voltage (defective regulator on the controller board? usually one 3.3V and another one with 2.5V or 1.8V))

[PlainBill]

Re: Dell E178FPb - white screen

problem fixed.
now back to the o.p's issue.

That may not be so easy to resolve. By the symptoms, it's a bad solder joint. Given the extreme small size of the components, the lack of schematics, and even pin-outs of some of the ICs, this is NOT easy. And an honest question is "How much time and effort should be spent on a 17" monitor?" Unfortunately, my frugal upbringing won't allow me to discard it!!!

PlainBill

[PlainBill]

Re: Dell E178FPb - white screen

Capxon GL is replace on sight (like fuhjyyu), white display problem and it being intermittent sounds like a flex cable issue or the Genesis controller not getting it's voltage (defective regulator on the controller board? usually one 3.3V and another one with 2.5V or 1.8V))

No, if I haven't made it clear, let me correct that. The panel circuit board contains a set of power supplies which generate the voltages needed by the LCD panel. That supply is dead. At one point yesterday it WAS working and the test points showed voltages ranging from approximately + 25 volts to - 10 volts (using an oscilloscope). Before I could grab a DMM, the power supplies had failed again.

And before someone else says 'Fuse!' let me repeat - there is 5 volts present on the panel card at all times.

PlainBill

[EGuevarae]

Re: Dell E178FPb - white screen

No, if I haven't made it clear, let me correct that. The panel circuit board contains a set of power supplies which generate the voltages needed by the LCD panel. That supply is dead. At one point yesterday it WAS working and the test points showed voltages ranging from approximately + 25 volts to - 10 volts (using an oscilloscope). Before I could grab a DMM, the power supplies had failed again.

And before someone else says 'Fuse!' let me repeat - there is 5 volts present on the panel card at all times.

PlainBill

I have seen that before and yesterday I revisited my notes. I have three Hanns-G panels with that symptoms/problems. One, sadly, got broken while I was extracting the lamps to fix a Samsung (how, I don't know. I promise I was as careful as always...). The other two ad their lamps removed too, but I did not discard them. Someone here suggested that one of the DC-DC converters on the board in the panel itself was failing, but due to the fact that I have no electronics background, and I don't have (contrary to Bill, and others around here) a scope, I just left them stored.

[PlainBill]

Re: Dell E178FPb - white screen

I have seen that before and yesterday I revisited my notes. I have three Hanns-G panels with that symptoms/problems. One, sadly, got broken while I was extracting the lamps to fix a Samsung (how, I don't know. I promise I was as careful as always...). The other two ad their lamps removed too, but I did not discard them. Someone here suggested that one of the DC-DC converters on the board in the panel itself was failing, but due to the fact that I have no electronics background, and I don't have (contrary to Bill, and others around here) a scope, I just left them stored.

I've seen pictures of other panel cards that had a single IC to generate the voltages. This one appears to use multiple ICs. I've been able to read the part numbers of a few of them. One does not appear to have a datasheet available. I was unable to match the part number of the other; probably a reading error on my part.

PlainBill

[alexanderjohn]

Re: Dell E178FPb - white screen

PlainBill,
Any progress on this? I have an E178fpb and the boards don't match the physical description of yours. or the pictures. I can't tell anything that's wrong with the boards.

[PlainBill]

Re: Dell E178FPb - white screen

PlainBill,
Any progress on this? I have an E178fpb and the boards don't match the physical description of yours. or the pictures. I can't tell anything that's wrong with the boards.

It's a slow process. I HAVE found a lighted magnifier so reading part numbers on ICs is now possible. Unfortunately, the numbers I come up with don't generate hits with Google. The input to the inductor is a steady 5V DC,obviously it should be switched on and off. The next step is to try to trace it back to the driver.

I had considered the 'poke and prod' approach on the assumption it was a bad solder joint. However, that seems dubious when it would involve shorting IC pins together....

PlainBill

[PlainBill]

Re: Dell E178FPb - white screen

Good news / bad news on this monitor. My wife teaches computer skills in a Middle School. One of the modules is base on the Lego Mindstorm robotics system. The NXT controllers are unreliable, the problem is often poor solder joints on the display assembly. Currently I have half a dozen of them in a box waiting for repair. Sadly, my venerable Ungar 27 watt soldering iron just isn't up to the task - the tip is too big. So yesterday I went down to Frys and picked up a Weller SP12. That worked much better, and I was able to cope with SMD devices.

Next, I pulled this monitor off the shelf and began touching up the components in the power supply area of the tcon. I hit paydirt when several resistors moved when I touched one end with the soldering iron (obviously the other end was not soldered). The display panel now works perfectly.

Unfortunately, I have misplaced the screws that hold everything together.

PlainBill

[ComputerGeek]

Re: Dell E178FPb - white screen

LOL Congrats, I Like it when you find the problem!

Do you think the solder joint cracked from heat?

BTW, I wish I could get a hold of some of those NXT controllers!

[sand3881]

Re: Dell E178FPb - white screen

I have one Dell E178FPc. When I power one the Monitor it shows the Full Screen Test pattern like images. It doesn't get affected with or without VGA cable connectivity

[Amraks]

Re: Dell E178FPb - white screen

Plainbill I had a heap of smd transistors on a kenwood head unit for the car do this, it took out the lcd display.

obviously sometimes the conditions in the room these are manufactured changes.
cause I have this other head unit the same and it never done.