Vertical lines, kdl-40lx900, i susect tcon

[Dogcatdog]

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

here are the Volt measurements i got for MAX17079
Pin 01. - 1.70V
Pin 02. - 0.00V
Pin 03. - 1.70V
Pin 04. - 0.00V
Pin 05. - 1.70V
Pin 06. - 0.00V
Pin 07. - 1.70V
Pin 08. - 0.00V
Pin 09. - 1.70V
Pin 10. - 0.00V
Pin 11. - 1.70V
Pin 12. to Pin 15 - 0.00V
Pin 16. - 5.94V
Pin 17. - 4.81V
Pin 18. to Pin 32 - 6.08V
Pin 33. - 0.00V
Pin 34. - 8.12V
Pin 35. - 7.39V
Pin 36. - 15.35V
Pin 37. - 0.00V
Pin 38. - 3.41V
Pin 39. - 3.26V
Pin 40. - 0.00V

[Dogcatdog]

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

there is a chip marked MAX17079 http://pdf1.alldatasheet.com/datashe...17079_10.html_ on the tcon, is that the gamma chip?

[Dogcatdog]

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

any other ideas?

[Dogcatdog]

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

somehow i missed that, well i took it completely apart to the bondings and to check if the bonds are the problem, that took ages, but they are fine and dont have a problem at all, touching them applying pressure did not change anything at all in the picture. so i guess the problem is the t-con,or maybe the mainboard? i dont know how to make sure, the question remains what could be dead there and how to test it, i would like to fix it on the component level.

thank you very much in advance

OP, I don't think you ever responded to this suggestion. It might be worth you time to look. Something might be touching somewhere it shouldn't.

[budwich]

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

have you checked the flat heat-sealed under the metal frame of the display?

OP, I don't think you ever responded to this suggestion. It might be worth you time to look. Something might be touching somewhere it shouldn't.

[Dogcatdog]

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

what else can i test?

[Dogcatdog]

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

just tried that, with a hairdryer, held it about 5 mins around there it was a bit hot like almost to hot to touch with the backside of my index finger but not that hot.
i hope that was hot enough.
there was no change what so ever

thank you in advance

Ok apply some heat to ic303 and ic300 then test.

[freakaftr8]

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

Ok apply some heat to ic303 and ic300 then test.

[Dogcatdog]

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

i have also found this picture, it is the same tcon board CPWBX 4351TP ZF or CPWBX4351TPZF made by Sharp, the picture is in really good quality it makes it easier to see

[Dogcatdog]

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

i hope those are good enough, i could not upload on the forum the files were to big or something is wrong with the forum it did not work i got error, so i uploaded here > https://mega.nz/#F!jRhzHI7Z!grnpZ9eeuAEWH4KV8Blr9g

Can you post a picture of the front of the tcon board?

[freakaftr8]

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

Can you post a picture of the front of the tcon board?

[Dogcatdog]

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

i tried what you have suggested to apply heat to the tcon board, but im not 100% sure to which component i should do it so i did it over the whole board with a hairdryer for about 5 mins. there was no change, did same with the mainboard same result. i wonder if i should do the freeze thing with an aircan and see if there is any difference? or should i rather not do that, since some ppl say its not good to do, some say you can do it, its fine.

thank you very much in advance

That does look like a 3.3 volt RAMDAC problem on the tcon board and since you mentioned the 3.3 Volt is jumping all around I would suspect a problem there.

You can try applying heat to the cheek on board to see if the problem disappears but I don't think it's going to it looks like a shorted RAM module

[Dogcatdog]

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

thx i gave it a read, i have tried to warm up the tcon with a hairdryer for a few mins to see if there is any change,and same with the mainboard, there was no change, have not tried it with freezing it yet.

this maybe worth a read
http://electronicshelponline.blogspo...board-how.html

[freakaftr8]

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

Tcon not check on.. stupid cellphone with predicted text... lol

[ReeceyBurger123]

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

that does look like a 3.3 volt ramdac problem on the tcon board and since you mentioned the 3.3 volt is jumping all around i would suspect a problem there.

You can try applying heat to the cheek on board to see if the problem disappears but i don't think it's going to it looks like a shorted ram module

+1

[freakaftr8]

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

That does look like a 3.3 volt RAMDAC problem on the tcon board and since you mentioned the 3.3 Volt is jumping all around I would suspect a problem there.

You can try applying heat to the cheek on board to see if the problem disappears but I don't think it's going to it looks like a shorted RAM module

[vinceroger69]

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

this maybe worth a read
http://electronicshelponline.blogspo...board-how.html

[Dogcatdog]

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

btw. i found the service manual, its the same as kdl-52lx900 and others of the AZ1-H chassis i.e KDL-40/52/60LX900,903,904,905

here attached as PDF

[mattstolte]

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

.

[Dogcatdog]

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

yes the menu is distorted and unreadable

Is there anyway to bring the menu up, if so is it distorted ?