LG 32LN5400 LED TV IPS Matrix Dark Spot Repair: DIY Options, Costs, and Feasibility

Hello.
I have a LG 32 "LED TV with an IPS Matrix.
He has been with me like this since 2013.
Currently, I use it as a monitor, and hence for a long time.
Recently a friend noticed that the matrix has a darker spot (center bottom).
It is possible that it is longer, but I did not pay attention until today, because the stain was "blinking". Probably some backlight / fall LED.
I called the LG service and the guy informed me that it is most likely that the matrix backlight is going down.
I'm from Grudziadz and the nearest website is in Toruń (That's what the guy from LG told me).
So some questions.
- Is it possible to repair it yourself? (Difficulty level)
- Are the repair costs high (Replacing the diode etc?)
- Does it pay off according to you?

In general, the TV set blows well, only that point does something.
At the moment I have reduced the backlight, it does not throw, but it can be that I am drinking something completely.

B3zK93 wrote:

Is it possible to repair it yourself? (Difficulty level)

Possible if the colleague can disassemble the matrix.

B3zK93 wrote:

Are the repair costs high (Replacing the diode etc?)

The cost of the led strip about 35 PLN.

I never did that. I wouldn't want to damage anything.

Hello.
The answer is rather that if you've never done it before, I advise you not to do it. It is very easy if you do not have practice to damage the matrix, and this is associated with the scrapping of the receiver. The second thing is that if the mechanic does it, he will work longer. The costs of backlight repair in 32 "are not large.
Best regards.

I also had a similar problem, I stripped the matrix and looked for a damaged diode
I decided to close it, skip it - one less has not changed the light on the screen - the TV has been running for almost a year - you can try

capanda wrote:

I decided to close it, skip it - one less has not changed the light on the screen - the TV has been running for almost a year - you can try

The fact that it works is only a fluke, the remaining diodes, thanks to the short-circuit damaged, work with higher current - that is, in worse conditions. Theoretically, they should die even faster now. In practice, the repair consists of replacing the damaged diode with an identical one, and modifying the measuring bridge of the power supply current, then the whole works with less current and less brightness - which is practically not noticeable to the user, and affects the durability of the backlight.

capanda wrote:

I also had a similar problem, I stripped the matrix and looked for a damaged diode
I decided to close it, skip it - one less has not changed the light on the screen - the TV has been running for almost a year - you can try

He probably works on Picture Mode, which has a lower backlight current and is therefore still working. Usually the user (client) switches to "dynamic" and then won't work for a long time, after the repair as above.

robokop wrote:

The fact that it works is only a fluke, the remaining diodes, thanks to the short-circuit damaged, work with higher current - that is, in worse conditions.

Why do you write misleading foolishness, do you know the principle of operation of the led driver used to control the diodes in the matrix?
Those with whom I met always had the character of a current source, so keep on telling yourself what changes the shorting of one diode.
The topic of control rolled out in the forum, but apparently you have not read them.

kazikszach wrote:

Why do you write misleading foolishness, do you know the principle of operation of the led driver used to control the diodes in the matrix?
Those with whom I met always had the character of a current source, so keep on telling yourself what changes the shorting of one diode.
The topic of control rolled out in the forum, but apparently you have not read them.

Somehow so far in these TV I have not met, that only one diode was damaged - open. In serial circuits I usually found two - one compact, the other with a break, which was just "putting out the image", hence I conclude that the driver does not fully control the current. That's why "Ruthenians came up with the modification - removing one resistor from the bridge creating a shunt in the circuit of the serial transistor keying the backlight current - to reduce its maximum value. One more thing - this is PWM control - i.e. not voltage regulated, but medium current - so probably clear what will happen.

Hello. Sorry for the dig, but tv gave up the ghost 2 days ago ...
It is possible that the matrix went.
If anyone needs some, here is the link.

https://www.olx.pl/oferta/telewizor-lg-32-model-32ln5400-uszkodzony-CID99-IDnhL98.html