Re: Visio VF551XUT 55''no sound no picture

Well after a bit more poking around, I'm still pretty much stuck.
I do see 3.3v on one side of R1 (3.5K) and the other side is connected to R11 (550) that is the series resistor for the PS-ON signal to J1-1.

I tried to trace the R1/R11 node (which is what I see approx 0.19v on when attempting to turn the tv on) to a collector of a transistor. This is what I can't find. It looks like there is a trace that would appear to go directly to the processor. Is it possible that a processor gpio directly drives this node? Perhaps...

Re: Visio VF551XUT 55''no sound no picture

Hi, thanks for taking the time to reply, I really appreciate it.

Yes, the scenario you describe makes sense to me and that's what I was looking for (and haven't quite got there yet.)

I was able to trace J1-1 to series R - R11 (550ohms). Other side connects to R1 (3.5K); other side of that R connects to another R - R23 (10K) which connects to collector Q7 and base Q5.

I was expecting to find a connection to a collector on the R11/R1 net but haven't yet. I was trying to find it. Perhaps I should...

Re: Visio VF551XUT 55''no sound no picture

Yes, sorry about the typo (or my bad eyes), it is a VF551XVT

Re: Visio VF551XUT 55''no sound no picture

Thank you so much for the rapid reply.
Yes, that is my main bd.

I had tried to trace from "ps on" backwards and got a bit lost as this is a multi-layer bd. I did provide an attachment with several voltage measurements for many of the regulators and transistors.
The main processor is under a heat sink and I was trying not to disturb it. Don't know if I'd be able to find a datasheet for it as I'm not sure if its a custom or not.

Most of the measurements I took for the regulators and transistors...

I have a Visio VF551XUT 55'' flat screen tv. The TV no longer turns on. The “visio” power indicator is amber when off. When the TV is turned on, the indicator changes to white and several “feature” lights sequence on as well. However, there is no picture or sound.
I have read several posts and attempted to troubleshoot the issue. This is where I am:

The issue appears to be related to the “ps on” output from the control bd.
When the power is turned on, I measure approx. 0.18v on the “ps on” signal.
If I isolate the “ps on” signal by disconnecting...

Re: New Members - please post your introductions here

Hi all,

I'm, new and seeking some info for a problem my visio 55" tv.
I am an elect eng but don't do very much pwb debug (especially w/o schematics)
I added my post to an active thread and would appreciate any suggestions.
Thanks
Steve

Re: Visio VF551XVT Problem

Hi, I have a similar (same) problem as Matt is describing above with my visio VF551XVT tv. I have a more detailed description and measurements of several of the regulators & transistors in the attachment. I agree with Matt. It would be a shame to spend a couple hundred bucks on what may be a single component failure.

Thank you in advance for any help provided.

Steve...