My Dell 1704FPV monitor keeps flickering its brightness from dim to bright? it also has started to flickers through different colours like red and green?? i dont want to buy a new one if i can help it? any help?? :)

2009 LCD monitor , 11 years old. and fails on all PCs I am sure.
all have CCLF black lamps, 99% are dead, or dim or even yellow tinged.
ok posted vast times this answer,
if the OSD brightness setting fails then....
the full story is here, 2010 is the first years of LED back lamps
you dont have those.
the CCLF lamps are bad, you can replace them or
buy never LED back lamped monitor, and frankly costs less.
https://www.manualslib.com/manual/1015803/Dell-St2010.html#



can I assume you turned on any monitor
pushed the OSD menu button of front of iT
then navigated to the brightness OSD section
and it's already fully high.,
yes, then that monitor has bad CCFL backlamps.
they run on 300vdc and the main board inside does that.
the go dim, most of them are now, or dead.
the have 20,000hr life span , very very short lived
compared to new LED monitors, very low life.

older post DELL says its 10 years old made in 2008
yes,
did you test this monitor unplugged on PC using the OSD screen
for 10 seconds, each power on OSD works.
see if 50% brightness works, if yes, the PC has problems.
seems you did and did not test monitor on other PC
and did not test your PC on other monitor,.both simple tests.

you are now speculating that one brand is better that another,
Viewsonic is best, HP and deLL< others not so.
what you failed to do is test your PC with known good monitor
and test the monitor on a known good PC.
2 tests. that yell truth.

Id go Viewsonic, we have many here, not one failed ever.
2010 or newer,
back in before year 2010 LED monitors they had JUNK monitors.
with weak low life, CCFL tubes inside, as YOURS DOES.
all monitors had that then, its not maker name issue at ALL.
here is how I discover truth,
1: I PRETEND TO BUY THE MAIN BOARD IN YOUR MONITOR.
AND LOW AND BELOLD CCFL H3LL IS THERE,

• go dim,
• go yellow on white pages.
• strobe.
• totally crazy random works or not,
• blinks
• will not dim right.(gee they are now old and weak)
• last 20,000 hrs (not much) and do all the above,
• now your board see these 4 jacks on the left 1000vdc to CCLF.

I have posted these hard fact there at fixya 100 + times.
here it is 1 more time.
I have the same tubes in my garage ceiling laps 8ft long and do the same thing.
https://en.wikipedia.org/wiki/Fluorescent_lamp#Cold-cathode_fluorescent_lamps

problem with LCD panel replace it

1. go into the menu and pick deguass
2. then do it

Press and hold the 'FN' key and tap the key that has the picture of a sun and an up arrow (or some other similar picture that dictates brightness - there should be two different keys that affect brightness one to increase and the other to decrease). Once you have the brightness set to your liking quit tapping the 'brightness' key and release the 'fn' key

but when low down the brightness it work good it not goes off , but it is very low brightness and difficult to read text some time......WHAT?

Can you explain in a bit more detail please...I don't know what you mean by.........'when low down the brightness it work good'?

But try holding down the FN key on your keyboard & tapping the Button that alters the brightness.

Hello,

The problem can be caused by 1 of 2 things either your power supply is going out or the backlight bulbs are going out. The most likely cause is the power supply. If you are willing to do a little soldering you should be able to do the repair. If you go to our web site at: www.ccl-la.com/badcaps.htm We have a section on monitor repair. Look under the Samsung 930B it is the same as your monitor.
If you don't want to do it yourself we do offer a repair service, email me if you are in need of that.

I hope this helps.

Buddy

You could have a faulty inverter, To determine if you have a LCD screen, inverter or video card problem, read this and follow these instructions.
Defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp.
Connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out
www.lcdparts.net
for parts, repair service and DIY info.

You could have a defective screen - a defective inverter or a CCFL lamp.
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:

• Screen flashs on red/pink and off.
• Picture stays on in red and slowly be come normal.
• Picture flickering with dim display.
• Picture flickering on and off.

All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

Hi there
If I understand you correctly from start up the screen is dim but does brighten up after time? But now after start up you are getting a flicker how ever a restart solves this.

On the dimming issue. Check your energy saving settings and brightness key is working OK.

The flickering is a bit of a concern.

Just a couple of questions.
Are there any dead spots on the screen? Areas where there are no pixels.
When you tilt the screen forward and backward, does this effect the brightness or flickering?

Paul