| Author |
Message |
CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
|
| Posted: Wed Mar 18, 2015 5:40 pm Post subject: 9500LC Issue tracking: Low output from green tube |
|
|
This thread was created to track my current 9500LC issue:
I have been running various patterns through the projector at night to clear up some uneven phosphor wear.
I went to turn off the projector before work and noticed that the screen had a pink color up, instead of white.
Green tube definitely has decreased output.
When I re-assembled the projector on the ceiling about 2 weeks ago, P14 voltage was within tolerance.
-You can see output from the green tube on the screen, but it's significantly reduced.
Before I left for work, I played with the G2 #'s a bit, but didn't get a change worth noting.
I briefly eyeballed the neck board with tired eyes.
-There were no immediate take-away from this. (No visually degraded caps etc.)
Restarting the projector had no effect.
It was noted that the heater was glowing in the green tube correctly, just like the other two.
(So it initially doesn't FEEL like a burned up tube from OV. My LVPS is also modded with a stable potentiometer)
Will go over the projector after work, and update at that time.
|
|
| Back to top |
|
 |
Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
|
| Posted: Wed Mar 18, 2015 5:53 pm Post subject: |
|
|
Hello
Swap neckboards with red; it is likely a neckboard or the VIM or the cable in between, there could be tarnish on the mini coax sockets
|
|
| Back to top |
|
|
CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
|
| Posted: Thu Mar 19, 2015 12:50 am Post subject: |
|
|
Swapped neck boards over, and the black lead from blue to green.
Still no difference.
Am testing more things, and swapping connections over right now.
If a tube had suffered from heater burn out or anything, the tube would not glow at the back end, correct? (it makes logical sense that this is so, but still, I figure to ask seasoned professionals...)
|
|
| Back to top |
|
|
Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
|
| Posted: Thu Mar 19, 2015 12:53 am Post subject: |
|
|
First thing: Check the filament voltage. If it's crept up, the tube can die very suddenly. I've seen that before. Ditto if the fil voltage is OK, but super high hours on the tube. Got a couple of tubes in from a planetarium that had 20K+ hours on them. Two of the lot were toast. Low emisison, you had to look right into the tube to see the image on the screen.
Measure or swap the G2 lead, and swap the video cable. G2 lead should be between 500 and 800 volts. Worst case, swap the tube position with the red, and see if it follows the tube. I've got those new old stock greens at $500 each, or might have some good working used ones for less than that.
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
| Posted: Thu Mar 19, 2015 12:57 am Post subject: |
|
|
No Low output would still have the glow on neck.
When swapping neck board keep everything the same connector wise.
Do it again with just the VNB swapped.Keep all cables to the respective tube.
Fire up and see what happens......
If it is the same then.........
Pull the VIM and swap mini rca's from Green to Red and green to red and re test and see what happens.
Nashou
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
|
|
| Back to top |
|
|
CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
|
| Posted: Thu Mar 19, 2015 1:14 am Post subject: |
|
|
Bah.
My multimeter is acting out, and I can't tell what's what.
Too late to pick up a new one, tonight. Gonna have to wait until tomorrow.
I haven't had any luck with board swaps and adjustments. Things seem to be working ok on other tubes.
Green still casts a very weak image to the screen. Gonna pull it and move it at this point.
|
|
| Back to top |
|
|
CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
|
| Posted: Thu Mar 19, 2015 2:10 am Post subject: |
|
|
ok I really think it's time to take a break.
moved green to red spot.
Now getting HFail VFail.
If I prop up the red tube and connect it, still getting VFail..
I need a stiff drink....
|
|
| Back to top |
|
|
CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
|
| Posted: Thu Mar 19, 2015 2:12 am Post subject: |
|
|
Took apart the HVPS.
Nothing looks out of place. Fuse intact.
Yep. Taking that drink now.
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
| Posted: Thu Mar 19, 2015 2:20 am Post subject: |
|
|
You didnt have to go through the trouble of pulling the tube. Just swap the VNB's . The umbilical cord, the G2 and the Mini RCA all come off the board then put the other VNB from another known working tube to the Green. keep all connectors from the green tube to the new vnb.
if there still is an issue then just move the vim rca connectors.
Check the HDM is seated well and make sure you have the VDM connectors perfect and not jumped one over.
Nashou
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
|
|
| Back to top |
|
|
CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
|
| Posted: Thu Mar 19, 2015 2:30 am Post subject: |
|
|
Swapped the tube location so I could test it from the neck board connector backward, since the neck board wiring can't go far enough to use it where it sits.
No luck with swaps, but still don't know the exact voltage of P14 until I replace the multimeter.
I'll double check all my wiring and positions tonight, but won't power it up again until I can get P14 tested proper.
Thank you for the support, Nashou and Curt!
|
|
| Back to top |
|
|
Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
|
| Posted: Thu Mar 19, 2015 2:42 am Post subject: |
|
|
Shame on you, not having a (working) DC voltmeter in the house. 
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
| Posted: Thu Mar 19, 2015 2:43 am Post subject: |
|
|
| CSX wrote: | Swapped the tube location so I could test it from the neck board connector backward, since the neck board wiring can't go far enough to use it where it sits.
No luck with swaps, but still don't know the exact voltage of P14 until I replace the multimeter.
I'll double check all my wiring and positions tonight, but won't power it up again until I can get P14 tested proper.
Thank you for the support, Nashou and Curt! |
I dont under stand this?
VNB's are interchangeable between tubes. You dont have to stretch wires form one tube location to another.
Just remove all cables from the red or blue tube's VNB and remove it off the tube neck. set it aside.
now do the same for the green tube, now take the red or blue VNB which ever you removed and slide it onto the green tube and reconect the G2 wire on the tube pin then the other associated wires to the new VNB. then put the vnb from the green tube onto the other tube reconnecting all wires. make sure the G2 tube pin wire is on the right pin or you'll get a bright tube and then you have to let it shut down on its own or pull the P14 wire tot he heaters. Never shut the PJ down or pull the plug if the tubes go super bright. Allow the Protection circuit to shut down the HV.
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
|
|
| Back to top |
|
|
CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
|
| Posted: Thu Mar 19, 2015 2:43 pm Post subject: |
|
|
| Nashou66 wrote: | | CSX wrote: | Swapped the tube location so I could test it from the neck board connector backward, since the neck board wiring can't go far enough to use it where it sits.
No luck with swaps, but still don't know the exact voltage of P14 until I replace the multimeter.
I'll double check all my wiring and positions tonight, but won't power it up again until I can get P14 tested proper.
Thank you for the support, Nashou and Curt! |
I dont under stand this?
VNB's are interchangeable between tubes. You dont have to stretch wires form one tube location to another.
Just remove all cables from the red or blue tube's VNB and remove it off the tube neck. set it aside.
now do the same for the green tube, now take the red or blue VNB which ever you removed and slide it onto the green tube and reconect the G2 wire on the tube pin then the other associated wires to the new VNB. then put the vnb from the green tube onto the other tube reconnecting all wires. make sure the G2 tube pin wire is on the right pin or you'll get a bright tube and then you have to let it shut down on its own or pull the P14 wire tot he heaters. Never shut the PJ down or pull the plug if the tubes go super bright. Allow the Protection circuit to shut down the HV.
Athanasios |
I'm sorry, I wasn't exactly clear last night.
I did neck board swaps and the secondary wire swaps, and cleaned / swapped around the mini rca cables. No luck.
The issue never moved, the tube never got brighter.
The only reason for moving the tubes around was to test the highly unlikely scenario that an issue within the backplane / back plane to neck board connector is present.
More will be tested further, tonight.
| Curt Palme wrote: | | Shame on you, not having a (working) DC voltmeter in the house. |
I know, right? It was fine, but now all scrambly. Unfortunate, but for some reason, I've come to expect things like this surrounding the projector. No part of working with this thing is a speedy nor simple process.
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
|
| Back to top |
|
|
CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
|
| Posted: Thu Mar 19, 2015 3:10 pm Post subject: |
|
|
| Nashou66 wrote: | Where in Ohio are you? Im 3 hours from Cleveland in NY.
Nashou |
Columbus
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
|
| Back to top |
|
|
CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
|
| Posted: Thu Mar 19, 2015 8:46 pm Post subject: |
|
|
| Nashou66 wrote: | 5-6 hours at least. 
Nashou |
Yeah. That would be a bit of a trip....
I'll post all findings tonight. I'll swing by and pick up a multimeter after work, and will be in good shape to examine everything in more detail, and with far more patience.
|
|
| Back to top |
|
|
CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
|
| Posted: Fri Mar 20, 2015 12:24 am Post subject: |
|
|
Ohhhhhhhhhh yeah.
I burnt the green tube to a crisp.
I had to have brushed against the potentiometer when I installed the power splitter in between the LVPS and HVPS.
That sucker was reading over 10v! 
Dialed it down to around 6.3v for now...
Green tube is gonna be needed.
Does anyone around here take low output tubes for recycling?
Now I feel like an idiot not testing P14 voltage after moving the HVPS splitter.
GENIUS!!!!!!!
|
|
| Back to top |
|
|
Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
|
|
| Back to top |
|
|
Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
|
| Posted: Fri Mar 20, 2015 2:43 am Post subject: |
|
|
|
Is that a supply from me? I always mount 2 watt pots between the fans. I always silicone seal the pots though.
|
|
| Back to top |
|
|
|
|
