CurtPalme.com Home Theater Forum

papalek · Joined: 08 Mar 2006 Posts: 1536 Location: Longs SC

The 3600 I sold my sister has quit working. When you turn it on it comes up like it should as far as HV "crackel" and normal start. But there is no picture. If you look into the lenses you will see a vertical band in the center of all three tubes. The band is not bright enough to burn the tubes but it is very distinguished. Unpluging the video feed to the tube changes nothing. Adjusting the G2 for the tube does not make it any brighter or dimmer. Nothing changes the band of light and the remote says "RGB1 CHANNEL3" as it normally does. Pressing help or test on the remote does no good. The PJ is getting a signal because the frequency counter registers the frequency as it is changing slightly just like mine does.

I have almost a complete set of back up boards to try and swap out except the RGB input board and the focus board.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

First question. You say adjusting the G2 doesn't make the line any brighter, does it produce a full raster though? If no then you say it has a vertical line. Is it in the center of the tubes? A vertical line would run top to bottom which means loss of Horz sweep. If this is what you mean then I would first swap the Horz output board. If no go then try the Horz supply and drive. If its a line from left to right then its loss of vert sweep, then try vert deflection. Info you gave is not real clear though. Also remember voltage supply problems can cause these issues also.

papalek · Joined: 08 Mar 2006 Posts: 1536 Location: Longs SC

All the voltage LED's are lit on the LVPS. Th line is about a 1/4 inch wide Vertical. It is in the center of the tubes,on all three. The G2 makes NO changes, brighter ,darker highth,width or any changes at all.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Id try Horz output first.

Robert A. Hill · Joined: 19 May 2006 Posts: 182 Location: Simpsonville, SC

Does increasing the blanking make any difference at all?

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

Time to break out the DVM. A good place to check for horizontal sweep is the transistor pass assy that is bolted to the side of the chassis near the horiz output bd. The center lead of the big transistors should be +40 to +150V depending on the frequency. 15KHz is near +40V, 64KHz will be near +100V. The left lead should be about 20% less than the center lead voltage. Ground the DVM - lead to the chassis. Be careful and don't short anything out with the probe tips.

Scott

**Curt Palme** · Posted: Tue May 27, 2008 12:02 am Post subject:

I've had bad H output boards cause exactly that problem. ONe of the transistors/MOSFETs on the heatsinks short out, and sometimes take the driver chip out with it.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Hmmmm. I thought component level discussion was a big no-no. So I was told. Smile

**Curt Palme** · Posted: Tue May 27, 2008 1:09 am Post subject:

Yeah, but finding all of the bad parts isn't as easy as it seems. Miss one and you blow the whole thing up again.. Wink

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

Curt is right about fixing H sweep problems. Alot of times you have to test/fix all three of the H defl bds together.

This problem might not be a sweep problem. The sweep fail circuit could be acting up, the G-2 circuits could have a problem, or there could be something wrong with the G-1/blanking circuits on the CRT cards.

Scott

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Guys

Dont get me wrong here. I would be all for component level discussions. But when I am specifically told that component level discussions are not allowed, then when I comment on it about someone else, the same person gives further info as to say this is an exception to the rule. My thoughts are WTF, then why an exception here after I was told no.

You guys want to do component level, that's fine with me and I'll join right in. I'd even be glad to go over and help Paul with this if he needs a hand since he's only 45 minutes from me. Smile

**Curt Palme** · Posted: Tue May 27, 2008 3:03 am Post subject:

Well of course I'd prefer that all repairs be sent to me. Very Happy

I didn't really make an exception here, other than it's quite possible that more stuff will get blown up in the process of troubleshooting. I spent a day here once going through 3600 H output boards, and they are not as easy as they look, so be forewarned... Wink

I blew quite a few parts up in order to figure it all out.

papalek · Joined: 08 Mar 2006 Posts: 1536 Location: Longs SC

I will test the out puts as tse suggested but I will NOT do board level repair. I will swap out the boards with the working ones that I have. I am just surprised that the CPU is not reporting any problems.

papalek · Joined: 08 Mar 2006 Posts: 1536 Location: Longs SC

And macgyver655, This is not even 45 minutes from you. It is at my sisters house which is in Finklea. It is on your side of Loris that is almost halfway between you and me. Very Happy

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

papalek · Joined: 08 Mar 2006 Posts: 1536 Location: Longs SC

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

papalek · Joined: 08 Mar 2006 Posts: 1536 Location: Longs SC

The girlfriend and I have been wanting to take one of them deep sea fishing charters. Very Happy