CurtPalme.com Home Theater Forum

rjnsales · Posted: Thu Nov 23, 2017 4:41 pm Post subject: Sony G90 error Code 61

Just sitting with my laptop hooked up to the moome card on my G90 and Pop everything shut down kind of a loud pop as well probably a cap anybody no where it might be board etc.. Forgot to mention error Code 61 displaying

Regards Bob

HaydnG90 · Joined: 22 May 2006 Posts: 1335

Power supply?

"61 (orange) Protector POW1 Abnormal in the 200 V line"

**Curt Palme** · Posted: Thu Nov 23, 2017 6:27 pm Post subject:

Add another imploded green G90 tube to the pile... Just did some checking with Bob, and yes, the green tube is cracked...

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Wow. Just wow.

Already contacted him about it.

Still got a few green LUGs available. Close to a dozen if I count all the ones that are in complete projectors here.

Might as well count them since I doubt that there's a lot of opportunity to sell complete projectors today.

HaydnG90 · Joined: 22 May 2006 Posts: 1335

How many hours on the green tube that imploded?

Any correlation with how the tubes are driven eg high CR/brightness settings or failing Dallas chips?

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

I've seen G90 greens that popped that didn't have any visible wear on them and hardly a trace of back glass yellowing.

It can happen on new tubes or very old ones.

I am positive it's a thermal management issue.

I have the Mikado (current manufacturer) tube specifications, the full document, and there is a defined maximum thermal
dissipation and beam current specification as well as notes on cooling requirements.

I firmly believe that G90s bust tubes so fairly often because they can be run very bright because they stay sharp at higher output
levels than other projectors. People tend to run them as hard as they can as long as the image doesn't get soft.

We have also seen G90s wear tubes faster than other projectors and I'm sure that the two are two sides of the same coin.

If you run a G90 no brighter than you would run a Marquee with the same tube type, I'm sure you'll have no tube breakage issues.

So far, every broken G90 tube I've had to (very carefully) cut out of the mounting frame all shared the same specific characteristic, namely that in every case a break in the tube glass runs directly over at least one of the four metal spacer pins that sets the silicone
bead thickness between the frame and the tube glass. I believe that pin provides a "cold spot" of direct thermal conduction to the frame (aluminum) which creates a focal point for non-uniform thermal stress across the tube face. I believe the tube break begins right there. If I redo any more tubes I'll place plastic spacers in those locations rather than use those metal pins, in order to help attempt to keep the tube face more isothermal across its surface.

CIR Engineering · Posted: Tue Nov 28, 2017 12:52 am Post subject: