Maker Pro
Maker Pro

49" monitor repair help

JamezTheSavage

Dec 30, 2022
9
Joined
Dec 30, 2022
Messages
9
My dell 49" monitor (the only 49" monitor on Dell website) is occasionally flashing with many horizontal green lines. It is currently opened up and I've checked the capacitors for any visible damage as that's what I've seen is most likely. I also already know for sure that it isn't a driver issue as it doesn't do the same thing in my other monitor.
 

Attachments

  • 16724142489213907011042662767602.jpg
    16724142489213907011042662767602.jpg
    353.4 KB · Views: 3
  • 16724142673257797205443955639723.jpg
    16724142673257797205443955639723.jpg
    292 KB · Views: 3
  • 16724142878094547246366266167187.jpg
    16724142878094547246366266167187.jpg
    302.2 KB · Views: 3
  • 16724143003916173885733463735143.jpg
    16724143003916173885733463735143.jpg
    243.2 KB · Views: 3
  • 16724143140671054008095472548481.jpg
    16724143140671054008095472548481.jpg
    250 KB · Views: 3
  • 16724143236955555106523399089912.jpg
    16724143236955555106523399089912.jpg
    245.2 KB · Views: 3

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
If you have two identical monitors then swap out the boards individually until you find the one that's causing the issue. This is the only 'simple' method of reducing the potential problem to just one board without resorting to some sophisticated test equipment.
 

JamezTheSavage

Dec 30, 2022
9
Joined
Dec 30, 2022
Messages
9
If you have two identical monitors then swap out the boards individually until you find the one that's causing the issue. This is the only 'simple' method of reducing the potential problem to just one board without resorting to some sophisticated test equipment.
Sadly I don't have an extra one of those
 

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
doesn't do the same thing in my other monitor.
...... is why I assumed you had one..... a little lack of clarity!

occasionally flashing with many horizontal green lines.
That the fault seems to localise to one of the main colours (red, blue, green) might be a clue... Are there different signal input ports you could try an alternative input on?
 

JamezTheSavage

Dec 30, 2022
9
Joined
Dec 30, 2022
Messages
9
...... is why I assumed you had one..... a little lack of clarity!


That the fault seems to localise to one of the main colours (red, blue, green) might be a clue... Are there different signal input ports you could try an alternative input on?
I Apologize for my lack of clarity, I was referring to a smaller dell monitor, approximately 27 inches. When the 49" monitor was together, I had originally had it on a display port to mini display port but it had the same issue and was rather difficult to connect to my laptop. I had then put it on hdmi to hdmi where it was still displaying the lines but was easier to connect. Could this issue be due to a fractured part of the screen?
 

davenn

Moderator
Sep 5, 2009
14,296
Joined
Sep 5, 2009
Messages
14,296
Could this issue be due to a fractured part of the screen?

is there a visible fracture ? you never commented on that at the start.

Working with LCD panels a lot, but mostly much smaller ones, I have found 99% of the time coloured lines on a screen,
horizontal or vertical, usually is a faulty LCD panel, the actual panel, not the electronics as shown in your photos.
 

JamezTheSavage

Dec 30, 2022
9
Joined
Dec 30, 2022
Messages
9
is there a visible fracture ? you never commented on that at the start.

Working with LCD panels a lot, but mostly much smaller ones, I have found 99% of the time coloured lines on a screen,
horizontal or vertical, usually is a faulty LCD panel, the actual panel, not the electronics as shown in your photos.
I didn't notice a visible fracture but a fault LCD screen does make sense to me. Do you have any ideas on how to test this?
 

davenn

Moderator
Sep 5, 2009
14,296
Joined
Sep 5, 2009
Messages
14,296
Do you have any ideas on how to test this?

replace it is my usual repair procedure but in your case, buying just the LCD Panel as a spare part may well be more expensive that
replacing the whole monitor. You would need to try and do a price and availability check
I have the advantage, where I work, of having spare LCD panels for various displays that I can just do a quick plug-in swap and confirm if it is the panel or the any of the main boards ( that I can also change around)

You dont have that ability, so unless you find an obvious failure on one of the boards, PSU etc you will be in for buying a new monitor
(which, since you have pulled it apart, I am assuming it's out of warranty)

cheers
Dave
 

davenn

Moderator
Sep 5, 2009
14,296
Joined
Sep 5, 2009
Messages
14,296
. Could this issue be due to a fractured part of the screen?

ohhh I forgot to comment....
A fracture of the actual screen would be pretty obvious, not just the fracture but it would cause the liquid crystal to leak within the
panel and would totally mess up the display

Ohhh and the other 1% of times that I didnt comment on....
it's the cable and it's connectors between the main board and the panel not seating properly
 

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
You should be able to download a screen test program (there may be one built in to the monitor menu too) where you can display static images of fixed colours, bars, grids etc to make visual test of functionality. With a static 'black' screen you can them press around the borders of the screen to see if the flashing stops (assuming it's still visible on a black screen - use another contrasting colour if it's not).

This might localise a poor LCD edge connection - problem then is fixing it as these types of connections are bonded to the glass and rarely fixable.

Has the screen ever been dismantled prior to this issue occurring?
 

JamezTheSavage

Dec 30, 2022
9
Joined
Dec 30, 2022
Messages
9
replace it is my usual repair procedure but in your case, buying just the LCD Panel as a spare part may well be more expensive that
replacing the whole monitor. You would need to try and do a price and availability check
I have the advantage, where I work, of having spare LCD panels for various displays that I can just do a quick plug-in swap and confirm if it is the panel or the any of the main boards ( that I can also change around)

You dont have that ability, so unless you find an obvious failure on one of the boards, PSU etc you will be in for buying a new monitor
(which, since you have pulled it apart, I am assuming it's out of warranty)

cheers
Dave
If this is the case I'd be at a total loss as I can't find anybody that is selling the lcd screen
 

JamezTheSavage

Dec 30, 2022
9
Joined
Dec 30, 2022
Messages
9
ohhh I forgot to comment....
A fracture of the actual screen would be pretty obvious, not just the fracture but it would cause the liquid crystal to leak within the
panel and would totally mess up the display

Ohhh and the other 1% of times that I didnt comment on....
it's the cable and it's connectors between the main board and the panel not seating properly
So are you saying the cable and it's connectors are the problem or are they at least part of the problem?
 

JamezTheSavage

Dec 30, 2022
9
Joined
Dec 30, 2022
Messages
9
You should be able to download a screen test program (there may be one built in to the monitor menu too) where you can display static images of fixed colours, bars, grids etc to make visual test of functionality. With a static 'black' screen you can them press around the borders of the screen to see if the flashing stops (assuming it's still visible on a black screen - use another contrasting colour if it's not).

This might localise a poor LCD edge connection - problem then is fixing it as these types of connections are bonded to the glass and rarely fixable.

Has the screen ever been dismantled prior to this issue occurring?
I'll make sure to test it once I put it back together. And no, it's never been dismantled until I had started looking into getting it fixed.
 

danadak

Feb 19, 2021
795
Joined
Feb 19, 2021
Messages
795
There is a number of videos on Youtube fixing monitors. Usually high density high pitch
connects as previously mentioned, bad caps ion power supply, burnt components in
power supply......


Regards, Dana.
 

JamezTheSavage

Dec 30, 2022
9
Joined
Dec 30, 2022
Messages
9
Unusually, the monitor had just started working today and had lost the green lines even though I had not done anything to it since. I now suspect that it was a loose connector or something that had just gotten bumped back into place.
 
Top