Sony KDL 46W4100 with worsening vertical lines in horiz blocks

[patricksurry]

I've owned this TV since new, about 10 years old, but in last few months started to show some vertical lines in the bottom half of the screen which would disappear after a few minutes "warming up".

Lately the vertical lines fill the whole screen, and no longer disappear. They are laid out in four and a bit horizontal bands, and are mostly static but sometimes seem to have a little 'flicker'. You can still see the picture 'behind' the lines, and appear on all inputs I've tested: several HDMI and internal TV as well as the menu screen. See attached for examples.

I'm competent with electronics, but never done an LCD repair. Wondering if this looks fixable - main board or tcon replacement?? - or should I call it a day and get a new TV?

[nomoresonys]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

Could be a bad tcon board, if so they are pretty easy to change out.

[patricksurry]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

Is there any good way to test that theory short of buying a new board and swapping it?

[nomoresonys]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

Well get out the old trusty hairdryer and heat up the mainboard, heat the ic's and the capacitors etc. see if the picture clears up, if not do the same to the powerboard, there's probably test points on your tcon but I can't tell where they are on this one.

[nomoresonys]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

.

[patricksurry]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

Here's some pics of the inside. I disconnected the t-con board (4 ribbon tapes, 2 larger cables) and reattached, tried putting light pressure on tape connection, no change in the picture defect from earlier pics. I can't see any components that look obv bad, but I'm no expert.

I assume the t-con pcb board should be removable from the heatsink housing? I think i've removed all screws (there's one thing that looks a bit like a flush thumbscrew with a circular key which I don't know how I'd remove - see the housing closeup near the number LJ63-05576B) but it still seems to be pretty securely attached, apparently by various thermal pads?? Is there a trick?

I tried to grab pic of identifying marks on the t-con board, you can see inside the housing one number printed on the PCB 404652ASNC6LV3.7, and a barcoded sticker with S2151J8E0407 / 005191, which looks like it might be this board: https://www.shopjimmy.com/sony-1-857...-con-board.htm

Not in stock anyway, but would be nice if I could reassure myself that this was the likely culprit before I buy a new one.

[nomoresonys]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

You're right just stuck on with thermal pads, pull it off gently to keep thermal pads in tact.

[nomoresonys]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

What is your panel sticker number? will be on tv metal chassis somewhere, white sticker.

[budm]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

Did you try heating up the main board as suggested already?

[patricksurry]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

Panel sticker is cunningly hidden under the metal shield which holds the main board, challenge to get a picture without dissembling main & power board, but sticker shows this Samsung S-LCD panel:

LTY460HC01
0821
P7AE 7M8E08762A 103

LTY460HC01103


Also managed to extract the t con board from its enclosure, picture also attached. No signs of obv damage there.

I'll try some heating of the main board next - tho it makes me nervous that I might damage something. Is the idea to reflow solder or expand a cracked joint back to contact, or do some of the analog components respond to heat for some reason? or something else? sorry for n00b questions.

[budm]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

Use hair dryer for heating the main board.

[patricksurry]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

In case anyone finds this thread, wanted to post resolution.

I tried heating but no effect. So I thought I'd try replacing the t con board and eventually found one on e-bay for $40 or so. lo & behold swapping it out made the tv work like new again. yay!

Is there any use for the old t con board (can it be refurbed by switching out capacitors or whatever?) or should I just throw it out.

Thanks for the encouragement to explore and get it fixed!

[nomoresonys]

Re: Sony KDL 46W4100 with worsening vertical lines in horiz blocks

Thanks for feedback, I would hang onto the old tcon, odds are there's lots of good components on it that you may need at some point and maybe you can fix it and have a spare, the older these tvs get the harder parts are to find.