Samsung LE40A558P3FXXU Colored lines

[24mech]

Good evening, I'm looking for some help with my daughters TV please, it has recently developed an issue, When you turn on the unit you get colored lines running top to bottom of the screen, I have carried out some very basic investigation and googling from what I can gather this may be an issue with the T-con, I have check and re seated all the cables running from the av to the t con and the t con to the panel I read about several people have this issue with other models of Samsung and a temp fix by flexing the pcb av or t con until the lines clear,this I have tried with out success, before I go any further I thought I would as for some guidance from you guys.

Thank you

[Diah]

Re: Samsung LE40A558P3FXXU Colored lines

could you show us the issue with pictures or movie.?
did you tried to feed the set with different source of signal such HDMI or playing video material with USB to see if the issue remain? also did you tried to reset the firmware of the TV?
also if you disconnect one side ribbon cable between T-CON and panel.. did you got clear white color on half side panel or the lines remain??

[24mech]

Re: Samsung LE40A558P3FXXU Colored lines

Thanks for the response


this is the issue


This it the T-con


and this is the TV ID Plate


I have a video, not sure how to add it though.

[24mech]

Re: Samsung LE40A558P3FXXU Colored lines

that is with no feed, how do i reset the firmware are you able to point me to or provide some instructions on how to thanks.

[Diah]

Re: Samsung LE40A558P3FXXU Colored lines

forget about firmware or feeding another source.. just do test disconect one side of ribbon i mentioned before and tell the result

[24mech]

Re: Samsung LE40A558P3FXXU Colored lines

This is with right (looking from screen side) cable removed



and this is with left cable removed

[trunks81]

Re: Samsung LE40A558P3FXXU Colored lines

You should check the COF cables, probably a loose contant if not there is an short on the cof

[Diah]

Re: Samsung LE40A558P3FXXU Colored lines

however this test of ribbon removing sgould be done with signal feed cable or sat or areal.. to see the next half how the picture look.. you can do it again with signal..

i am aware the daughter did clean the screen with spray or wet cloth which some of liquid drops down on the panel PCB boards and make damage to one or more small SMT ceramic caps.. or as usual most time we find these caps got shorted with out any liquid damage too..

so do the test again with signal.. if same result go to inspect the 2 panel PCB or post clear photo of both side over here... good luck

[24mech]

Re: Samsung LE40A558P3FXXU Colored lines

I'm not aware of any cleaning, retest with signal feed = same result. what are you referring to by 2 panel PCB? I shall post some pictures of the T-con and av boards now, I can not see any obvious signs of component failure though you might see something I can not, thank you for assisting me with this.

[24mech]

Re: Samsung LE40A558P3FXXU Colored lines

I did find some debris on the t-con connector cleaning it made no difference

Is the stain on that component normal?


T-con Front


T-con Back


I'll post pictures of the AV board shortly just got to take them first.

[Diah]

Re: Samsung LE40A558P3FXXU Colored lines

2 Ribbon cable which going out from T-CON to the Panel, they are connected on PCB boards of the panel.. take the metal cover of them.. you will see 2 boards left and right... here are the issue..

[budm]

Re: Samsung LE40A558P3FXXU Colored lines

Example of Tab bonding board that you need to get to them to inspect them.

[24mech]

Re: Samsung LE40A558P3FXXU Colored lines

Thanks for helping what am I inspecting for please? I can't see anything can you I've added some pictures of the two tab bonding boards

[budm]

Re: Samsung LE40A558P3FXXU Colored lines

Pictures are too low res for me to zoom in to see anything in details.

[24mech]

Re: Samsung LE40A558P3FXXU Colored lines

can I upload high res pictures? didn't think I could.

[Davi.p]

Re: Samsung LE40A558P3FXXU Colored lines

In theese models tcon is on the top so cleaning damage is almost impossibile, the first thing to do in theese cases is to check main voltages on tcon, much probably something's wrong, if all ok then processor need reballing.

#### NOTE FOR EVERY TV POSSESSOR, EVERY XX YEARS IT IS NEEDED A CHANGE OF THE CONTACT MATERIAL ON CPU AND HEAT SINK ####

[24mech]

Re: Samsung LE40A558P3FXXU Colored lines

Thanks for the info guys, I've had another look at the t-con I can see a gold circle labeled 12VIN i'm assuming this is the 12 input, what should I be using as the negative for test this feed also should I be looking for any other input voltages or outputs? thanks

[nomoresonys]

Re: Samsung LE40A558P3FXXU Colored lines

Metal chassis back for ground.

[Davi.p]

Re: Samsung LE40A558P3FXXU Colored lines

must know the tcon model code, to find better pictures..

[24mech]

Re: Samsung LE40A558P3FXXU Colored lines

must know the tcon model code, to find better pictures..

On the T-con is T400HW01 V4 CTRL BD and 40T02-C02 I've added some hi res photos does this help?

I'll do the 12V check today and report what I find thanks.