Diagnostic a samsung 32" aparently bad backlight

[Miguel2013]

Bought it for 50$
Aparently just the back light is bad, i plan fixing it myself

 

[Bill_Bright]

I don't think that is the backlighting, but if it is, not sure it can be fixed. It is not like the old days when you could simply replace the CCFL tubes or the inverter. That uses LED backlighting which means there are 100s of tiny LEDs emitting the light. And clearly, many if not most are.

So I suspect that is the controller board and it is highly unlikely you could find a schematic for that. Unless there was a component that was obviously bad (burnt or cracked) yet you could still identify the part numbers, you would need to replace the entire board. And I doubt you could find one without just buying a whole monitor that still worked. Then there would be no point in repairing the first one.

That said, before doing anything else, I would try that monitor on a different computer to see if the same problem appears there too.

 

[FoulOnWhite]

I don't think that is the backlighting, but if it is, not sure it can be fixed. It is not like the old days when you could simply replace the CCFL tubes or the inverter. That uses LED backlighting which means there are 100s of tiny LEDs emitting the light. And clearly, many if not most are.

So I suspect that is the controller board and it is highly unlikely you could find a schematic for that. Unless there was a component that was obviously bad (burnt or cracked) yet you could still identify the part numbers, you would need to replace the entire board. And I doubt you could find one without just buying a whole monitor that still worked. Then there would be no point in repairing the first one.

That said, before doing anything else, I would try that monitor on a different computer to see if the same problem appears there too.

Could be edge lit, so "might" be fixable if it's possible to get the LED strips. Though deffo looks like a panel problem to me.

 

[Bill_Bright]

Could be edge lit

Umm, no doubt it is. All but some budget displays use edge backlighting. And again, unless one knows the correct part numbers, not sure they would be able to obtain compatible strips - if they are the problem.

 

[Tahagomizer]

Umm, no doubt it is. All but some budget displays use edge backlighting. And again, unless one knows the correct part numbers, not sure they would be able to obtain compatible strips - if they are the problem.

The other way around, edge backlight is the default cheap option. Most panels bigger than 27" use this kind of LED backlight:

Higher quality displays use far more dense arrays. Usually you can find them fairly cheap on Aliexpress, but the quality is hit and miss. Also, the panel needs to be to completely disassembled which can be troublesome on bigger ones since the panel itself is very delicate, so are the diffusing layers. One has to use use nitrile gloves, any stain or crease will be very visible and impossible to get rid of. The biggest screen I ever repaired the backlight on was a 55" TV and it definitely was a two person job. The one from the OP looks like a damaged edge backlight though so should be fairly easy.

 

[Bill_Bright]

The other way around

I'm going with this March 8, 2023 CNET article, LED LCD backlights explained, where it says,

Most LED LCDs on the market today are edge-lit

There are a few models that are have their LEDs arrayed on the back of the TV, facing you. These are less common, though are making a comeback in the form of cheaper, but thicker, mostly low-end LED LCDs.

There are a handful of high-end TVs that use full-array LED backlighting

While the OP's Samsung is a nice, far from "low-end" monitor, it would not be considered a "high-end" monitor either. While 32" may be considered large for a computer monitor, it is relatively small in comparison to big screen TVs (and 55" is big) where edge lighting has a hard time reaching the middle of the screen. What you have seen with TV displays should not be used to indicate it is the same with displays intended for use with computers - at least not in this case.

There is nothing in the specs of the OP's monitor to suggest it uses full panel backlighting. So, after further research, I stand by what I said previously.

REGARDLESS the type of backlighting used in this monitor - I also stand by what I said about the economic feasibility for repairing this monitor. In addition to all the time, effort and difficulty involved in troubleshooting down to component level, it would be a challenge identifying the part(s) needing replacement, locating a seller of the part(s), and buying the part(s) at a reasonable price - and that's assuming replacement parts are even available - a potentially big assumption.

Even if replacement parts are available and fixed the problem, it would still be a 4 year old, used monitor.

There are lots of brand new, name brand, decent quality, still under warranty, 32" monitors for under $250.

@Miguel2013 - I say for $50, turn down the brightness and contrast and I suspect before long, your mind will learn to ignore those anomalies.

 

[Miguel2013]

@Miguel2013 - I say for $50, turn down the brightness and contrast and I suspect before long, your mind will learn to

I'll try that