CurtPalme.com Home Theater Forum

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

dturco · Posted: Thu Jul 12, 2012 5:24 pm Post subject:

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Well now your going to have to start checking voltages like Curt said. Looks like most of the regulators are on the main board. How easy is it to get to and test on the main board?

dturco · Posted: Thu Jul 12, 2012 6:24 pm Post subject:

I don't know

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

well I can give you the points to test at if your up to it, lol. Sometimes it's easier to solder wires to the test points if they are hard to get at cause they have to be tested hot.

dturco · Posted: Thu Jul 12, 2012 9:35 pm Post subject:

Sure I have nothing to lose by trying on this piece.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Ok. I'm going to have you test across some capacitors. It's easier then trying to probe the regulators themselves. Set your DMM to DC scale. When I give you a cap number just test across it with your positive probe on the + side and the neg probe on the - side. Make a list of the caps I give you and then add the voltage you test it has so I can see what you have. Ready?

Oh, and do I need to say that the receiver must be turn on to test the voltage?

C705 = _______
C706 = _______
C725 = _______
C713 = _______
C716 = _______
C702 = _______
C719 = _______

dturco · Posted: Thu Jul 12, 2012 10:53 pm Post subject:

Thanks Mac, But I'll need a little more hand ho;ding...What board are they on? And where in the unit is it?

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

It's the main board. Not sure from your pics but it has a heat sink on it. Look at the image and I also circled the caps you need to find.

dturco · Posted: Thu Jul 12, 2012 11:29 pm Post subject:

OK I found them They are on the bottom most board. In my second picture there are two foil strip connectors then two "red" screws, to the left there is black heatsink and a smaller aluminum heatsink. The capacitor between them is C-706 and the pins face down so I can't place the probe on them.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Welcome to the wonderful world of troubleshooting AVR's.. LOL. Does it have a removable bottom cover? Some do. If not then you can try probing the regulators themselves but if you slip, you can take out a good regulator plus other components.

dturco · Posted: Thu Jul 12, 2012 11:50 pm Post subject:

No to the removable bottom cover. Sure let's try the regulator.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Now your making it difficult on me, lol. We will start with the regulators on the heatsink. The attached image shows where to place your probes to test. Red for + and black for -. Fill in the voltage blanks for these 5.

dturco · Posted: Fri Jul 13, 2012 12:21 am Post subject:

Well Mac I don't think I can get to them either. The foil connectors are right in the way and the pins are naturally way down low on that board so...I just don't think that's going to be possible.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Then you will have to disassemble somewhat, solder on some wires, reassemble and test. We could try to figure out what voltages are on what connectors but that can also be very difficult and time consuming. Soldering on wires is actually easier. Sorry but I can't make it much easier for you. I go through this all the time. I use very thin gauge, insulated magnet wire. I then tape them to a piece of cardboard and mark the voltage they should be on the cardboard.

dturco · Posted: Fri Jul 13, 2012 12:59 am Post subject:

Mac, I appreciate you having taken the time to diagnose this for me. But I see no way to get at the places needed to test other than a complete dis-assembly. The case is a U-shaped drop in, the side do not come off. The back is held together by hidden screws, I have removed 16 so far and it will not come off.

It appears to me that main board is like the Backplane on a Marquee, you have to tear it all down just to get at it. I just don't see that amount off work, just to test, as being worth it. I think I'll just stop here.

Again, thank you for helping.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

If you want I can probably give you other boards that you can test for voltages. It will take more time for me to locate them but if it's that hard to test on that main then this would be possible. However if it does turn out to be a regulator on that main board then you will have to remove it. Let me know if you want me to look for other locations to test.

dturco · Posted: Fri Jul 13, 2012 1:09 pm Post subject:

Sure, I was worn down yesterday and annoyed. Let's try somewhere else. Also When I do have to take it apart is there a diagram on the back panel screws?

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

I'll check the manual in a little while.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Do you have test leads with the hook clips? http://www.ebay.com/itm/1-pcs-Small-Test-Hook-Clip-to-Banana-Plug-for-Multimeter-Test-Lead-Cable-100cm-/251016735649?pt=LH_DefaultDomain_0&hash=item3a71c36ba1