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36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far.... -
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.Comment
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Re: Dell E153FPB Back Light problem
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) ....
There are 10 kind of people in this world: those that understand binary, and those who don't.- ASUS ROG Maximus IX Code
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2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job
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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!Comment
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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 ???Comment
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Re: Dell E153FPB Back Light problem
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.
There were only four c5707s (two bad, two good). Did not see fu9024 but the other transistors seem to check out.
Thanks!Comment
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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!Comment
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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,
lcdmanComment
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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 helpComment
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Re: Dell E153FPB Back Light problem
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.Comment
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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.Comment
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Re: Dell E153FPB Back Light problem
Take it apart and post some pictures following the instructions in my sig file (earlier post).--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
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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.Attached FilesComment
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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.Attached FilesLast edited by retiredcaps; 01-16-2012, 05:52 PM.--- begin sig file ---
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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.Comment
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This happened last Saturday and today I finally had time this morning before I went to work to replace two non brand capacitors
I will let you be the judge weather or not these are bad or not according to the blue ESR meter that I am using
I am comparing them to a brand new one that I installed
The display came back on and the programming was not lost which I was surprised by I would have thought that when the display went blank that so did the memory as well
I going to let it run for several days before I remount back on the wall next to the... -
Hello friends,
A yellow light was flashing on my monitor. It was like it was constantly cutting power. When I opened it up, I saw that the big capacitor in the high voltage line was leaking. I replaced it. When I turned it on for the first time, it had the same problem again. But then, interestingly, it got better. The yellow light was on steady. But the monitor wouldn't turn on. When I examined them with a thermal camera, I saw that the Fli5961-LF reached 50 degrees Celsius and the EM636165TS next to it reached 100 degrees Celsius and was drawing high current on the motherboard....11-13-2024, 07:00 AM -
hi to all
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