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LCD TVs - LED

OKITVV32T2 Horizontal strip in the upper zone.

soyneo2
soyneo2
soyneo2
34
hace 5 años
hace 5 años
Hello everyone, I have a TV that turns on correctly but shows a strip at the top (attached image) I have looked at the tensions of the T-COM and I see how the 12v enter, and I have the following tensions, failing only 2 of them. Given that this scheme is correct and since I could not find how to solve this problem thinking that the problem was the IC marked 3, I decided to buy another T-COM, but I have the same problem, so I rule out the T-COM I doubt that it is the power supply, but still I have looked at its output voltages and I see that I am missing the voltage of PIN 13 that I have 0v and in the scheme it shows me that I must have something (the image of the scheme does not show the complete voltage as I show in the picture), it can be, 3.3v or 33v, the case is that I have nothing and I don't know if it can be the reason. As a note I will say that the TR810 transformer makes a noise or hum. Can you help me find the problem? Thanks in advance NEW CONTRIBUTION TO THE PROBLEM I have disassembled the panel to expose the top plate that is integrated into the panel, there are 6 strips or displays cof. I have measured the test points shown in the image and I have some voltages 20v for VGH-L 2v for GSC_L 0v for GSP_L 0.6v for GOE_L -6.5 for VGL But I don't know if they are correct, does anyone have the schemes on this board? The model is the same as the T-com board I've shown before, Philips LC320WXN-SAA1V I also comment, that at the entrance of this board, I have the 15v input, I have 3.3 in VCCL What do you recommend me to do? EDIT: I EDIT again with the image on the side of the panel I have uploaded a video to YouTube to visually show the problem by touching the cofs. [url=https://www.yoreparo.com/engage-external?codeHref=aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g%2Fdj1Fc3lvcU52WTV6aw%3D%3D&hash=af592d9528961a39evd=yvq=vdv=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=v=========== NEWS: Imeasuredthetensionsinthelateralcof,andatoneofthetestpointsIrealizedthatwhenthehorizontalstriplookedgooditwaswhenitmeasured0.6v...andwhenitblinkedorjustlookedbaditroseto1.2v. Ontheotherhandinthelateralconfbelow,itistheonethatiscorrectandalwaysmeasures0.6v.SoImeasuredcontinuityfromthosetestpointstothetopplateuntilIfoundacapacitorthatmeasures3.3v....Ihavedesoldereditbyremovingitfromthecircuitandithasstoppedblinkinglookingalmostperfect. But when testing the TV with a video, I see that the colors are altered, the blacks seem reddish tones, I think it is to remove that condenser, but I would not know which one to put since it is SMD and I do not know its real value. (The capacitor in question is the one that appears in the 4th image above marked C205) Attached image of how it looks with the black background, with reddish hues. Regards
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sanfalla
sanfalla
sanfalla
1.821
hace 5 años

ok as you see the cofs are on the sides of the screen ... there are 3 on each side, turn on the tv as it is uncovered ... and with the image you go with your finger pressing each cofs ... until you find the culprit and sometimes the shield that covers the tcont puts that fault and brueno test and comment since there is a radical plan b

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soyneo2
soyneo2
soyneo2
34
hace 5 años

I have uploaded a video to YouTube to visually show the problem by touching the cofs.
https://www.youtube.com/watch?v=EsyoqNvY5zk
Regards

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sanfalla
sanfalla
sanfalla
1.821
hace 5 años

there is the problem and two solutions ....
1) you can press it with a thermal rubber (which the microprosesder uses to dissipate heat) when you place the screen frame is pressed and it can work
2) start the cof ... it will work but it will no longer be full hd is still hd the same image will continue to look good

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Franki Lobaina
hace 5 años

Sanfalla how can you suggest to the colleague to boot the cof chips, since without them the screen is destroyed, have you done this? If you have done it, you know the result, do you know how these integrated in the panel work? The colleague has spent time and effort trying to repair his screen, please if you don't know, don't comment

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sanfalla
sanfalla
sanfalla
1.821
hace 5 años

I think the one who doesn't know is you franki I think he lacks street in this field ... and his comment is too much ", please if you don't know, don't comment" I think it's you who doesn't know ..... https: //www.youtube.com/watch?v=N_HN62eDv5c .... this video can teach you to repair this type of fault

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sanfalla
sanfalla
sanfalla
1.821
hace 5 años

https: //www.youtube.com/watch? v = 9vCFmIe2Z2Y ...... another video more Miss Franki in case you doubt in the previous video

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sanfalla
sanfalla
sanfalla
1.821
hace 5 años

you saw the videos I sent

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soyneo2
soyneo2
soyneo2
34
hace 5 años

Yes, sanfalla friend, but removing the condenser, I have achieved the same thing as tearing the cof as it appears in the video, but the colors that I leave do not like to give it as repaired .... I think this repair can be improved, some another tip? Thank you.

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sanfalla
sanfalla
sanfalla
1.821
hace 5 años

in the video that you uploaded ... touching the cofs with your fingers the fault is corrected ... then it is false contact that the condesador that you took will not solve since it is a communication problem I gave you 2 options is in you speak with the client and explains that you should keep in mind that the panel is damaged and those are the options or replace the screen as a last resort

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sanfalla
sanfalla
sanfalla
1.821
hace 5 años

when I tell you false contact .... it is because some pins of the 3 cofs are detached, to finish it from starting is what follows

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Franki Lobaina
hace 5 años
hace 5 años
Friend, the problem is in the display, one of the side cof chips is failing, you should check if in this display the cof are mounted on tape, if so verify the presence of voltage at the test points of the tape, if the cof chip comes within the display you only have the option to identify the one that is defective and eliminate its clock and start signals, the problem is that for small screens this solution is not 100% effective and it is possible that even if the defect is corrected there is another Decrease video quality. In any case, make progress to continue helping. Greetings and luck
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soyneo2
soyneo2
soyneo2
34
hace 5 años

I have edited the initial question with new data. Thank you

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Franki Lobaina
hace 5 años

The problem is rather in the lateral cof, check if they are mounting on tape that is where they have more possibility to repair, it is possible that some power is not coming, specifically the vgh. Comment

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soyneo2
soyneo2
soyneo2
34
hace 5 años

I leave two new images in the initial question, I show the two plates, left and right, I don't know what it means if it is mounted on tape or not, check the images and tell me what should I do?
Thank you

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Franki Lobaina
hace 5 años

The cof chips that you show are the ones above, these activate the vertical pixels, to which I refer are the lateral ones, the cof chips are door activation circuits that can be mounted on tape (TCP) or printed on glass (COG) , in the latest technologies they were replaced by glass mounted gate controllers (ASG). If the ones on your TV are TCP, the repair is easy, since it is only to connect the pulses that do not arrive through a cable, if they are ASG, you have to use another method a little more complicated.

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soyneo2
soyneo2
soyneo2
34
hace 5 años

And what do you recommend me to do? what can i check?

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Franki Lobaina
hace 5 años

Say if you have side cof mounting on tape or not, remove the side frame and if they are mounted on tape you will see them, if so send a photo of one of them

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soyneo2
soyneo2
soyneo2
34
hace 5 años

I have disassembled the frame of the panel, on one side it has nothing, on the other it has some small flexes that protrude from the panel and that has some test points facing down. I have edited the initial message by contributing a photo at the end of the whole.

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Franki Lobaina
hace 5 años

Friend this is a bit complicated work, you must turn the display carefully, remove the paint at the test points and check if all the voltages are coming, special attention to the cof that feeds the section with defect, and specific the voltage vgh, if you can upload a photo of the cof as well as its numbering to indicate what signal each point is

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soyneo2
soyneo2
soyneo2
34
hace 5 años

I have uploaded a video to YouTube to visually show the problem by touching the cofs.
https://www.youtube.com/watch?v=EsyoqNvY5zk
Regards

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Franki Lobaina
hace 5 años

Friend do not start the cof chip because it will destroy the display, you must make measurements, and determine which signals are lost when moving the cof, the test points are for this, when you determine the lost signal, which must be vgh, you just have to pull a cable with a resistance of 100 ohm to its corresponding point on the plate that joins the display. I repeat DO NOT boot the cof chip

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Franki Lobaina
hace 5 años

The truth is that yes, I still have a lot to learn, and that's why I continue to study every day, but I have never suggested to anyone a possible solution without first finding it, I have to study any test material, I don't walk looking for possible colleagues' solutions throughout the network to give them as my own, since that is called plagiarism, in addition to knowing that a lot of information on YouTube is false, when I give a possible solution I am 100% sure of it, right or wrong since All failures are not resolved the same. He didn't answer my question. Did you do this job?

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Franki Lobaina
hace 5 años

I have never tried this method, and I may do a test to verify, but as far as I know little, this technique opens up many questions, because a screen is made up of thousands of pairs of field generating electrodes and an active electro-optical layer between them , one of the 2 generation electrode fields is connected to a switching element to receive an electrical signal and the active layer converts this signal into an optical signal. The display includes a door controller and a data controller, the door is applied to a door line by a signal that turns on and off a

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Franki Lobaina
hace 5 años

turn off a pixel, and the data controller converts image data into voltage that is then applied to a data line. These gate signals are processed by the scan controller circuits and amplified by the level change to analog signals that are emitted as door pulses to scan the panel. Door activation circuits, commonly called cof chips, can be tape mounted or printed on glass. My first question how is the multiplexing of the signals achieved without these gate activation circuits or cof chips, if we know that the display

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Franki Lobaina
hace 5 años

Is it a matrix type and is fed by the row-column system? What does the manufacturer do if he could achieve this from the same scanner and save gast? Do you think that the Soyneo2 colleague's screen is not going to be dark because it does not have the row signals? I hope the colleague Soyneo 2 tells us results so I can learn more, since I really do not dare to waste one of my displays, maybe I find some defective and I am motivated to try. If you can answer my questions I will be very grateful, and remember to answer the first one. Did you do the test? Greetings and luck

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soyneo2
soyneo2
soyneo2
34
hace 5 años

Ufff you make me doubt since the videos seem real.
Before doing anything irreversible I will look for the lost signal as recommended by colleague Franki ... and as a last resort I will do the removal of the side flexes.

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Franki Lobaina
hace 5 años

Well friend is your decision, I only ask you to comment results and so we all learn.

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Franki Lobaina
hace 5 años

Amigo Soyneo2 did you do the test ?, can you comment results? Regards

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soyneo2
soyneo2
soyneo2
34
hace 5 años

Yes, excuse me, until yesterday I could not continue with this TV.
I update the main thread with the news, let's see what you think.

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Franki Lobaina
hace 5 años

Friend I see that you have advanced, I was asking you why 3 days ago I did the test to start up defective 2-chip cof chips that I had, and despite knowing what the result was going to be, I wanted to get out of doubt, and the expected result, “screen black “, totally destroyed. Sanfalla videos are total lie. Apparently Sanfalla continues to insist that he do it but he does not dare to do the test or did he do it ?, I think not. I only have a little confirmation and it is to do it on the specific screen of the video, so that nobody makes me any story, even if I know the result,

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Franki Lobaina
hace 5 años

I will see how I get it and do the test and comment, I repeat, I know the result, but I am addicted to testing and curiosity surpasses me. As for your TV these capacitors are almost always 100 microf, these cof have a number that looks below, send the numbering and a photo of it to see if I have the data, for years I have taken voltage data to these cof and it may be that I have yours. Greetings and luck

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soyneo2
soyneo2
soyneo2
34
hace 5 años

Thanks for sharing your experience.
Despite being a couple of days working today has blinked again ... so I already doubt it was the capacitor ..... I am still investigating.

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soyneo2
soyneo2
soyneo2
34
hace 5 años

The issue of rare colors, has been resolved from the T-COM, thank you very much for the help to everyone.

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Franki Lobaina
hace 5 años

Amigo Soyneo2 looks in this post what happens to screens that do what Sanfalla tea recommended to do to yours, and still recognizes that the procedure does not work, what do you think he wanted to achieve if you had followed his advice? https://www.yoreparo.com/es/tv/televisores/lcd/led/preguntas/6204741/tvled-32-lg-32lf550b-flex-lateral-cortado#

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sanfalla
sanfalla
sanfalla
1.821
hace 5 años
hace 5 años
the problem is in the panel .... either because of the leds or fail in the cofs ... you should check
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soyneo2
soyneo2
soyneo2
34
hace 5 años

If it's from the panel, why do I have two bad tensions in the Tcom?
You mean the capacitors that go on top of the panel?

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sanfalla
sanfalla
sanfalla
1.821
hace 5 años

those voltages are in their range of bone tolerance is fine and the cofs come on the sides of the panel here you can see them ...... https: //www.youtube.com/watch? v = lF0xOC3ymGU

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sanfalla
sanfalla
sanfalla
1.821
hace 5 años

I repeat the cof are on the sides of the panel (on the same screen but on the sides) upload a photo of only the panel (lcd) and I tell you and with the video you know what to do I have a radical method to solve

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sanfalla
sanfalla
sanfalla
1.821
hace 5 años

friend check the sides of the screen not above the cofs are some flexs that protrude from the lcd screen

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