Sony KDL-46Z4100 another TCON problem?

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

I see now that you are right; no need for another picture. F100, 4A/72V near LVDS connector and F101, same fuse on left. I should check them both?

Thanks,

Chuck

[budm]

Re: Sony KDL-46Z4100 another TCON problem?

Do you see the two fuses I mention above?

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

Yes.

[budm]

Re: Sony KDL-46Z4100 another TCON problem?

Then you just have to check and see if you get DC voltages at both ends of the fuses with ref to chassis ground.

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

OK, thanks. I'll check and report back.

Chuck

[budm]

Re: Sony KDL-46Z4100 another TCON problem?

You can use Ohm meter to check if they show less than one Ohm resistance first. You know how to test the fuse, right?

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

12V DC at all both ends of both fuses.

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

And yes, less than 1 ohm resistance across both fuses.

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

I tested resistance by probing the two ends of the fuse with the two probes of the VOM. I tested voltage by holding the negative probe from the VOM to a chassis screw and the positive probe to each end of each fuse. I hope that's correct......they are kind of tiny.

[budm]

Re: Sony KDL-46Z4100 another TCON problem?

That is correct, and when testing the DC voltages, the TV must be turn on. When Ohm test , TV must be unplugged.

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

Yes on both counts and as reported, the resistances were both below 1 ohm, essentially zero. And I had 12V at each end of both fuses with power on.

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

I suppose this means that there is no obvious problem with the TCON board? By the way, I noted that if I power the set on with the LVDS cable disconnected from the TCON board, it does not go into the 14 blink failure mode. Stays on, but obviously, with no picture.

[budm]

Re: Sony KDL-46Z4100 another TCON problem?

Do you get the same error with the original T-CON board?

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

No, the colored vertical stripes are gone. But the TV won't stay on. It shuts itself off after about 30 seconds and the red light on the front panel blinks 14 times repeatedly. It doesn't stay on long enough to hook up a source and test for an appropriate picture.

[freakaftr8]

Re: Sony KDL-46Z4100 another TCON problem?

Ok im thinking faulty lvds cable from mainboard to tcon. Sonys will 14 blink when the mainboard doesnt get confirmation from the tcon. Sense you plugged your original mainboard in your still getting this error I would assume that you had moved the LVDS cable and it's no longer making proper contact with the t-con board

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

Let me clarify what I've done. I started with the colored vertical stripes as shown in my original post. I purchased a used replacement TCON board and after installing it, found that the vertical stripes were no longer present, but the TV would shut itself off and display 14 blinks of a light on the front panel. After reading the posts from Bud last night, I checked continuity of the fuses on both the old an replacement TCON boards, and both showed nearly 0 ohm resistance. I also checked voltage at both ends of each fuse on the TCON board on the replacement board only. All of those measurements were 12V DC. I did not get the autoshutdown with the original TCON board, just the vertical stripes.

So that's where I am now. I have not checked voltages across the fuses with the original TCON board installed. Should I do that? And can I check the LVDS cable using an Ohmmeter to check resistance of each wire? Any other suggestions? I appreciate them all!

Cheers!

Chuck

[selldoor]

Re: Sony KDL-46Z4100 another TCON problem?

Hi - yes you can check the lvds cable for continuity.
Maybe you can do the test from connector to connector
(sometimes there are tiny test points on the boards)
This would mean you are testing both the cable and verifying that it has a good connection at the same time.

[Davheel]

Re: Sony KDL-46Z4100 another TCON problem?

Hi just wonder have you resolve the issue?

[cwmcobra]

Re: Sony KDL-46Z4100 another TCON problem?

Still unresolved. I confess I haven't had much time to spend on it with travels and other time constraints. I did look at it again yesterday and have concluded that testing continuity on the cable is a no go for me. The wires and terminals in the connectors are WAY to small for me to check with my VOM probes. And some of the terminals are almost hidden in the connectors.

So where do I go from here? I don't know. If the experts here have any other ideas I'd love to hear them. I could make good use of the TV if I could fix it, but haven't found the right "magic" yet......

Cheers!

Chuck

[Keithj84]

Re: Sony KDL-46Z4100 another TCON problem?

My tv has the stripes but when I first turn it on the picture is fine. Then the picture freezes for about 20 seconds and the color inverts then changes to stripes. The picture returns if I shut it off and back on again or sometimes it will come back after a few minutes without me having to shut it down. Any ideas of what might be going on with it? Thanks for any assistance