Vertical lines, kdl-40lx900, i susect tcon

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

did same measurements with power on. i attached picture

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

i just did what you asked, the far right one is disconnected and the other 3 flex connected gives me the same side blank white i.e. 1/4 of the panel, and the rest has same pattern pink/white vertical lines, and the other side around on the far left if i repeat the same, gives me the same, although one of the sides the left one i.e. CN1301 if i disconnect that then the picture next to it is a bit darker then the rest of it, but still same pattern.

also i did the resistance measurements, without power, i attached a picture, to show what gives what value. of what i measured.

thank you in very much in advance

Either I don't understand you or you don't understand me. Please ONLY DISCONNECT one of the four cables (either one at each side to the tcon card).... as opposed to only having ONE cable connect which is the way that I read your post. Please confirm / re-read the post.
Further on looking at the bottom flex tab cables, I know its a lot to get at them so don't try this again yet. Just do the "one cable disconnected" tests.

As for measurements, I just suggested that you do simple resistance measurements across the component in question... what do you get?

[budwich]

Re: Vertical lines, kdl-40lx900, i susect tcon

Either I don't understand you or you don't understand me. Please ONLY DISCONNECT one of the four cables (either one at each side to the tcon card).... as opposed to only having ONE cable connect which is the way that I read your post. Please confirm / re-read the post.
Further on looking at the bottom flex tab cables, I know its a lot to get at them so don't try this again yet. Just do the "one cable disconnected" tests.

As for measurements, I just suggested that you do simple resistance measurements across the component in question... what do you get?

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

thank you very much for the reply, please let me know what kind of measurements i should take, i have tried each of the 4 cables that go from the tcon to the panel as individually connected, when i do this i get washed out bright lines, without anything from the menu or channel visible.
i took the panel apart the other day and tried to apply pressure, to the bonds/flex cables individually, but there was no change what so ever. i will take it apart again one more time if necessary. it was very much a pain in the butt to take it apart.

thank you in advance

OK... but I didn't ask you to measure voltage.... you are trying to find out what that component might be. There are other types of measurements that will tell you something about the component.

further, have you tried operating the tv with one of the tcon cables disconnected, either far right or far left... what is the resulting picture. Further, if you access the edge boards on the bottom of the panel that the tcons are connected to, there are flex tab cables running from those boards to the panel. If you gently rub those flex tabs on the side associated with the disconnected tcon cable, are there changes in the picture / screen on that side?

[budwich]

Re: Vertical lines, kdl-40lx900, i susect tcon

OK... but I didn't ask you to measure voltage.... you are trying to find out what that component might be. There are other types of measurements that will tell you something about the component.

further, have you tried operating the tv with one of the tcon cables disconnected, either far right or far left... what is the resulting picture. Further, if you access the edge boards on the bottom of the panel that the tcons are connected to, there are flex tab cables running from those boards to the panel. If you gently rub those flex tabs on the side associated with the disconnected tcon cable, are there changes in the picture / screen on that side?

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

thanks for the reply. thats the thing, if you mean component "33300 K028F"
i can not measure the voltage, as soon as i try, the screen turns black, and when i take the dmm measurement lead away then it comes back but it looks different afterwards. when i turn the tv off and on again its same as always.

ok... but at least now the forum knows its got four leads ...:-)

Of course... I am just going by your "cooments on interest" around said component. My question its either some form of capacitor and/or resistance pack. The next thing to do would do some measurements around it to possibly confirm that... perhaps the results will shred some light on the numbers (hint... the readings might be those numbers in some form). Related to that, I am not sure its wise touching a "powered" board with your fingers on any conductive surfaces... they may be enough "energy" to hurt you and / or maybe be enough to hurt a given component depending on what the fingers "bridge". :-)

[budwich]

Re: Vertical lines, kdl-40lx900, i susect tcon

ok... but at least now the forum knows its got four leads ...:-)

Of course... I am just going by your "comments on interest" around said component. My question its either some form of capacitor and/or resistance pack. The next thing to do would do some measurements around it to possibly confirm that... perhaps the results will shred some light on the numbers (hint... the readings might be those numbers in some form). Related to that, I am not sure its wise touching a "powered" board with your fingers on any conductive surfaces... they may be enough "energy" to hurt you and / or maybe be enough to hurt a given component depending on what the fingers "bridge". :-)

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

btw. i am still not sure if the problem is from the tcon or on the mainboard, maybe somebody can help me to check the mainboard, somehow, there are schematics of the mainboard in the PDF from post #10 https://www.badcaps.net/forum/showpo...5&postcount=10 the actiual PDF> https://www.badcaps.net/forum/attach...8&d=1447079878 i dont really understand it and if it is even possible to test somehow

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

which component are we talking about? "33300 K028F?" ? im not even sure what it is, i know that 2 terminals lead to ground of that and 2 lead somewhere into the processor since its a BGA i cant check where

You should try and trace the tracks going to and from the component in question. That might provide some clues (ie. are they going to grounds, power, interconnection to other ics, connection to resistors, etc?

[budwich]

Re: Vertical lines, kdl-40lx900, i susect tcon

You should try and trace the tracks going to and from the component in question. That might provide some clues (ie. are they going to grounds, power, interconnection to other ics, connection to resistors, etc?

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

so... shoved it in the oven for 8 mins. the tcon board, and thought well lets see, and well no change at all, then i thought, well lets try the mainboard, and hrmm still same no change at all in any kind, the symptoms are exactly the same, so i wonder, can it be caused by the power supply??? i cant imagine but who knows? what do you guys say? and if it is the SMPS what part of it could it be? what to test and what to test for?

[jeffecor]

Re: Vertical lines, kdl-40lx900, i susect tcon

No heat the oven up first! Then 8 mins

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

ah one more thing, i can preheat the oven to the specific temperature, the question is should i shove the board in once the target temperature is reached,? or put it in from the beginning when i turn on the oven and let it get to 230C or 240C and then once it reached that, let it run for 8 mins, im asking because it takes a good 10 mins to reach the 230C i mean to preheat the oven. that would then mean the board is in for around 18 mins. so im not sure thats to long or not.

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

well i can set the oven for 230 Celsius which is 446 Fahrenheit will that do?
i can just set the temperature in 10C increments on my oven, so either 220C, 230C or if 230C is not enough then 240C which is then 464 Fahrenheit, and i can set the time for exact 8 mins. on my oven, more or less concerning question: there are some components on the bottom side, so i wonder wont those just fall off the board when i try to reflow the solder? or will the surface tension keeps those on the board?

thank you in advance

well if you put enough time into it and you've got nothing left for it when I say go for it 450 degrees Fahrenheit for exactly 8 minutes. Then open the oven door turn the oven off let it cool for another 15 minutes before you touch it. And of course prop it up on something so the bottom of the board is not touching any metal surfaces

[freakaftr8]

Re: Vertical lines, kdl-40lx900, i susect tcon

well if you put enough time into it and you've got nothing left for it when I say go for it 450 degrees Fahrenheit for exactly 8 minutes. Then open the oven door turn the oven off let it cool for another 15 minutes before you touch it. And of course prop it up on something so the bottom of the board is not touching any metal surfaces

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

so... shove it in the oven for like 5 mins at ca. 200 Celsius? or higher and or longer?

You're pushing a small signal current into those test points changing the pattern on the screen from obviously varying the voltage to the main Sony processor. I would be under the assumption that either the main processor which is that big Sony CXD9982GG either has a bad BGA connection to the board or its bad itself. I would try to heat it up and see if the pattern changes at all.

And yes that Maxim chip is the gamma processor. Sharp likes to use those for their panels

[freakaftr8]

Re: Vertical lines, kdl-40lx900, i susect tcon

You're pushing a small signal current into those test points changing the pattern on the screen from obviously varying the voltage to the main Sony processor. I would be under the assumption that either the main processor which is that big Sony CXD9982GG either has a bad BGA connection to the board or its bad itself. I would try to heat it up and see if the pattern changes at all.

And yes that Maxim chip is the gamma processor. Sharp likes to use those for their panels

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

i found something.
there is an smd part marked, 33300 K028F,

When i try to measure the Voltage the pattern changes and or the screen goes black but im not sure if that thing
is the reason. it happens also when i push with my finger in that area, but only while i touch ground (chassis)
but same happens when i try to measure "capacitors/resistors"? around there
not sure what they are, cause there are no markings i will point them out in the picture

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

i wonder what the other chip then is the MAX17079, i mean its function

[Dogcatdog]

Re: Vertical lines, kdl-40lx900, i susect tcon

hrmm seems like this is the Gamma chip, i could not find the datasheet, its MAX9697A https://www.maximintegrated.com/en/p...l/MAX9697.html i attached a picture with the measured voltages, since i dont know which is pin 1.
so this is the best i came up with.

thank you in advance