Viewsonic N2750W With a Mind of Its Own

[dogdad]

Without tearing into it yet, I'm guessing it's the Main Board but wanted to check with the 'Collective' before doing anything dumb (again).

Symptoms:
1) No response at all via front panel power-button or top-mount controls (volume/channel/menu/etc).
2) Will ONLY respond to remote (Power/source/etc).
3) Bring volume up (remote), and it drops it back down by itself.
4) When changing source, it will display the new source name for only fraction of a second.
5) Going to MENU, it will randomly choose a menu 'page' and then lock up.
6) When in MENU, will sometimes cycle a setting (brightness/contrast/etc) up and down by itself.
... and so on.

As I said, I'm assuming Main Board because I'd assume that's where the 'brains' are. Have already amassed a stockpile of "Gee, maybe it's this board" when i guessed wrong. Fortunately, replacement boards are a lot less expensive than what I've been working-on of late.

Thanks in advance!

[martino]

Re: Viewsonic N2750W With a Mind of Its Own

stuck button on the tv perhaps?

[Th3_uN1Qu3]

Re: Viewsonic N2750W With a Mind of Its Own

I vote stuck push buttons too. Disconnect the push button board (turn on the TV first if the IR sensor is also on there) and see if it still does it.

[jiroy]

Re: Viewsonic N2750W With a Mind of Its Own

It could be also some interference from a fluorescent source nearby , or a nearby neighbor playing tricks on you , or some sort of spillage inside (Check for any recent cleanings) , and even a stuck remote control .

According to my experience ...

[dogdad]

Re: Viewsonic N2750W With a Mind of Its Own

All good ideas, thanks. Checking for stuck button was the first thing I tried when I got it a couple days ago (Oops, shoulda mentioned that before).

"But Wait! There's More!" ... as the tv announcer used to say. Tried to turn in on today, and got nothing. Up til now I was able to rule-out the PS, but this may begin to lead down diverging paths.

[dogdad]

Re: Viewsonic N2750W With a Mind of Its Own

Closing the loop here...
YES! It was a button! But not in the usual sense....

So I removed the push-button board again and played around with that, no joy. Next, was a replacement main board (I was sooo sure that was it ), but nope! Then squirted stuff into the tiny buttons and cycled them, thinking maybe a bad contact... not so.

However, I did get the tv to act 'normal' one time while poking the buttons. Ah-ha! Progress! Couldn't find anything obvious, so I eBayed a new button-board.

EUREKA! That was it! Did a post-mortem on the old button-board and found that the MENU button was actually cracked internally.

So how did that happen? No idea. TV had the symptoms even before I got started on it (I swear!!), so I DIDN'T DO IT!!!!

Just one of those things, right?

Right!


Thanks to all that posted, and I hope maybe this will help someone else in the future!