VIZIO E550i-B2 Sound - No Video Problem

[Shane711]

Re: VIZIO E550i-B2 Sound - No Video Problem

Yea, I thought about that afterwards. Would have been better to solder in wires. But I just glued the connectors down, I didn't glue the boards together. TV is working perfect.

[SLK001]

Re: VIZIO E550i-B2 Sound - No Video Problem

I wouldn't glue it like that. You never know when you might have to actually pull the two boards apart. It is better to assemble the two boards together, then solder the broken joints, then reinstall in the chassis as a single unit (both boards connected). This will minimize the stress on the joint and since it doesn't move, should last a long while. My VIZIO has been working since I repaired the connector and started this thread.

[Shane711]

Re: VIZIO E550i-B2 Sound - No Video Problem

Wow, So I was working on this TV today but before I even opened it I came onto Badcaps Forum and see what I could find. Sure enough my connector from the Power board to the LED Driver board is like barley hanging on. So I just added super glue between the plastic and the board and after I resolder it I will add Gorilla Glue to the top. I will do the same for both sides.

[budwich]

Re: VIZIO E550i-B2 Sound - No Video Problem

something bad has happened to one tab. It is causing "loading" across the panel which affects mostly timing of the signals. Removing the tabs takes that away. Of course, the set has been "saved" BUT no manufacturer puts in "things" that can be easily dropped or removed. The set will have some "compromise" and ultimately the tabs on the other side will have to work harder which will shorten their life span... but for now, enjoy your set.

[kevinm34232]

Re: VIZIO E550i-B2 Sound - No Video Problem

Nice job budwich! Can't believe the panel survived the abuse I put it through!

The biggest tragedy was the front bezel/frame that holds the panel in, all the tabs broke removing it, so I will have to glue it or leave some tape on it.

Appreciate the help immensely!

I'm curious, why do all tabs need to be removed, and what are we solving exactly?

[kevinm34232]

Re: VIZIO E550i-B2 Sound - No Video Problem

There are tabs on both sides. I'll give it a try and see what happens.. Thx

[budwich]

Re: VIZIO E550i-B2 Sound - No Video Problem

you basically tear all the tabs on the right side off. They are thermally bonded to the screen as soldering at the manufacturing stage would be detrimental to the panel at that point. But this may only work IF there are tabs on the other side of the panel to drive the screen.

[kevinm34232]

Re: VIZIO E550i-B2 Sound - No Video Problem

sorry ya i thought I had posted a pic, but it is just basically the left half of the screen perfect pic, with a blank right side. I have checked the components not finding anything wrong so far. What's the process of removing the side tabs? I've already considered the panel bad so nothing to lose trying..

[budwich]

Re: VIZIO E550i-B2 Sound - No Video Problem

:-( that means that the connections are formed somehow thru the panel itself to feed the side tabs. Personally, I have only seen a 70 in. I do believe others on this forum have been successful at pulling the tabs on "lesser models".... 60's for sure but not sure about 55's. Are the tabs, the same on both side of the set?

You still haven't posted a picture of the display showing the resulting screen with the tcon cable disconnected. You might try comparing both ends of the bottom edge boards (ie. right and left sides) and see if you can spot any differences that might point to a bad component that might be replaceable.

[kevinm34232]

Re: VIZIO E550i-B2 Sound - No Video Problem

So it seems there is no connection from the bottom right edge board to the side tab.

[budwich]

Re: VIZIO E550i-B2 Sound - No Video Problem

look at the bottom corner of the panel.... how are the side tabs / sides "tab cables" connected to the bottom edge boards? On 70 in units, there are small unclampable flex / ribbon cables running from the bottom boards to the side boards. On 55 in, their design might not have that "feature" (like some of the 60's).... as the tabs might be interconnected in some fashion thru the panel itself. how many bottom edge boards are there? I assume there is more than one... maybe one per "half". If there is more than one per half, they are interconnected with unclampable flex cabling. You can unclamp the cable on that side. It should give you more picture ... maybe 2/3 and further confirm the "postulation" that the right side is the issue. IF so, then you will have "tested" most of the connection path and only have the last little bit of bottom edge board along with the side tabs. You can then check that portion of the bottom edge board to see if anything "jump" out at you as there might be a component on the edge board that has a problem and maybe replaceable (with some effort). This would be before the "final / last hope" of tab removal which has no "back tracking mode" there after.

you might post a picture of display that you get.

I see from your picture that there is only one edge board per bottom half.... :-( so you need to look at the lower right corner to see what's up with the interconnection between the bottom edge board and the right side.

[kevinm34232]

Re: VIZIO E550i-B2 Sound - No Video Problem

What should I be looking for, don't see anything abnormal on the main tab bonds..

[budwich]

Re: VIZIO E550i-B2 Sound - No Video Problem

from your "test" doing the right side disconnected, it would appear your issue is on the right side (assuming your brain dead moment tested the disconnected left and got no picture at all... :-) ). Look on the right side, to see how the tabs are connected and see if you notice anything different amongst them (ie. heat marks, etc). Potentially depending on how the bottom edge boards of the panel are connected and how many there are, you can further your "testing" by unclamping the flex cable interconnecting the edge boards on the right side... if possible. This may give you even more picture, you can go from there.... hopefully.

[kevinm34232]

Re: VIZIO E550i-B2 Sound - No Video Problem

Ya i have seen this on the 70" Vizios and some have luck with that. Something about cutting the trace on the tab to the bad transistor?

[budwich]

Re: VIZIO E550i-B2 Sound - No Video Problem

so it potentially can have tabs removed to save it... IF it is has side tabs on each side.

[kevinm34232]

Re: VIZIO E550i-B2 Sound - No Video Problem

Yes OK sorry update is there is 12V to t-con before and after fuse.. I tried a new main board, same problem. So now that main and t-con were replaced, I'm thinking it's a bad panel. Could that be without shorting anything on the t-con?

Nevermind, had a brain dead moment forgetting to disconnect each side of the panel from the t-con, and could only see left half the screen come on normally with right side ribbon disconnected.

[vinceroger69]

Re: VIZIO E550i-B2 Sound - No Video Problem

Edit! dick barton beat me too it
have you got voltage too the tcon fuse? as could be a bad mainboard

[dick_barton]

Re: VIZIO E550i-B2 Sound - No Video Problem

Have you a supply to the tcon?

[kevinm34232]

Re: VIZIO E550i-B2 Sound - No Video Problem

I did the solder joints for the back light problem, now just have no picture but have back light. He said a tried a new t-con board and it didn't help, so I'm thinking maybe the panel..

[dick_barton]

Re: VIZIO E550i-B2 Sound - No Video Problem

May be worth watching
https://www.youtube.com/watch?v=NKdSrAH8_hs