CurtPalme.com Home Theater Forum

jarseneau · Joined: 06 Nov 2007 Posts: 323 Location: WI

My nephew was about ready to get rid of his NEC PG 6100 because every time he turned it on it would say UNRECOGNIZED SIGNAL even though there was nothing wrong with the feed and an ENTRY was made for the matching device. The other day I stumbled across this thread which pointed out the likely cause that the caps going bad around an oscillator on the H-Def board. A year or so ago he took my advice to get a spare board when one popped up on fleabay so he even had one on hand. Today we did the swap and behold; no more UNRECOGNIZED SIG! We did have to run the inputs one time and store them after changing the board.

A big THANKS FOR SHARING TINMAN! Thumbs Up

Heywood Jablome · Joined: 12 Mar 2006 Posts: 1548

This may be worthy of a sticky... it seems to come up often enough!

Tinman · Posted: Sun Mar 23, 2008 3:59 pm Post subject:

No problem! Mr. Green

Now just fix the other board.

Marc

dbaisey · Posted: Sun Mar 23, 2008 4:03 pm Post subject:

Jerry,
There is a fine line between this problem or the system board. If you have no other issues like the scrambled menus and just unregistered signal then this may solve it. Run it through its paces looking for thermal issues cold to normal operating temps. It doesn't take much of a change in freq for it to have lock up problems. Doug

Tinman · Posted: Sun Mar 23, 2008 8:54 pm Post subject:

While you are at it, take a real close look at the capacitors on the old deflection board. You may see actual wetness around some, and dark-greenish ooze around others. Often you can see this leakage going down the leads right to the board. I agree with Doug, but seeing this cap problem more often now. The beasts are getting old.

Marc

jarseneau · Joined: 06 Nov 2007 Posts: 323 Location: WI

Tinman · Posted: Mon Mar 24, 2008 12:24 am Post subject:

They don't always "leak" but an ESR meter spots em everytime.

Marc

Mark_A_W · Posted: Mon Mar 24, 2008 1:31 am Post subject:

Don't worry about the clock Jerry, it won't hurt things for it to run slow, and if you unplug the projector it will lose the clock data in a couple of days anyway.

I just have the clock turned off Smile

jarseneau · Joined: 06 Nov 2007 Posts: 323 Location: WI

Well, the NO SIGNAL problem has returned. After a week of perfect service the projector returned where it would take a long time to display a picture after power on and the message 'no signal' would appear in the lower left corner. The picture itself (1080i signal) was viewable but not completely converged and probably using some default memory. In that state, it wouldn't allow saving a SIGNAL ENTRY and obviously no signal name would be displayed.

Since changing the H-Def board seemed to fix the problem last time, I tried a different H-Def board but that didn't fix it. Then I tried cleaning all the board connectors; still no change.

Then I tried re-seating the System Board and this time the problem was fixed! The signal was recognized and Storing adjustments was once again allowed. I then cleaned the edge connectors on all the cardcage boards with contact cleaner and closed things up. It worked fine for a couple hours but the 'NO SIGNAL' problem returned but re-seating the System board corrected it again. This is my nephew's projector so I will need to check with him to see if the problem came back.

What can I do to permanently improve the cardcage connections?

dbaisey · Posted: Thu Apr 17, 2008 7:18 pm Post subject:

Jerry,
The next time it does this check the info menu for the signal properties. Compare them to when it doesn't act up. Note polarities and sync type (sep HV or com H/V). Doug

Also does it say no signal, new signal or unregistered signal?

**Curt Palme** · Posted: Thu Apr 17, 2008 7:31 pm Post subject:

I don't think this is a card cage issue, I've never had a module connector issue with an NEC.

I have some PG + system boards that are intermittent with the signals. A lot of the system boards will lock to video, but nothing over 480p, that's a typical failure. I have one board here that will not lock to anything under 720p, but 720p and 1024p lock perfectly. One other one will not hold it's memory, and not lock to anything over 480p at all.

Also a lot of times, the menus will be shifted on the screen, and it looks like the blanking cuts off part of the menu, but it's not blanking. THe letters of the menu get larger and more coarse.

I'm sure a bunch of this comes down to one or two components, it's a matter of solving this. I have 3 bad PG+ system boards here, along with about 6-7 XG system boards.

dbaisey · Posted: Thu Apr 17, 2008 8:21 pm Post subject:

Curt,
The shift is from it not locking onto the memory of the (orig) signal entry. We should be able to see if the signal itself has the same properties or if it is seeing something else. Would like to know if they match or not. On some I have seen sep sync change to H/V.

What is the source and signal chain? Is the source configured for a fixed resolution?

**Curt Palme** · Posted: Thu Apr 17, 2008 9:00 pm Post subject:

My bench has a regular DVD player going to a CenterStage HD scaler. I can do up to 1024p. Never had any problems with the setup in the 5 years it's been on the bench. The power for the projector is coming from the same AC outlet that is powering the scaler/DVD player.

dbaisey · Posted: Thu Apr 17, 2008 10:44 pm Post subject:

Curt,
Understand so I'm assuming you checked the signal properties to be the same? (from the info menu of the projector) Doug