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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sat Aug 23, 2008 10:22 pm Post subject: 1208/2 no pic: Red LED D40 lit on V board? |
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My neighbor managed to kill the 1208/2 I've got temporarily stationed in his poolside theater.
I hear the HV come up and all appears normal, but D40 on the V board is lit up. Source is S video until the thing is hung and the GD family electrician finishes his part (if ever.)
Tried switching sources from an SIR-T360 to a DVD player (also S-video) with no love. Anyone got any clue?
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Aug 24, 2008 1:10 am Post subject: |
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D40 is for the coincidence detection circuit and I think its suppose to be on.
Is there pic mute or cutoff on the remote?
How about on screen menu or test patterns?
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sun Aug 24, 2008 3:10 am Post subject: |
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No OSD, no text (or menu) display with ADJ or Text On/Off. I've since tried 768p on Ports 4/5 and Port3 from my laptop, same nothing as with S-video.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Aug 24, 2008 3:36 am Post subject: |
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What are the lights on the G2 diagnostic board? Whats on or off?
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sun Aug 24, 2008 10:53 am Post subject: |
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All other indicators are green.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Aug 24, 2008 3:22 pm Post subject: |
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Can you see the red glow at the back of the tubes?
You said you can hear the HV come up. Do it sound like it stays up or can you hear it discharge right after it comes up?
Not to repeat but is there a pic mute or cutoff buttons on the remote?
A no pic with the projector running could be video problem but with no menus or test patterns on all 3 tubes would have to be a problem very late in the signal chain since menus are introduced near the end, just before going to the amps or crts cards.
Could be high voltage shutdown.
Could be no heater.
Keep poking around and see if the tubes are glowing in the back.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Aug 24, 2008 3:26 pm Post subject: |
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Oh and also, on the G2 diagnostic board there is a green led farther over from the group. Is it green or is it brighter green from the rest?
Also is the scan fail led lit. Second from last from the edge?
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sun Aug 24, 2008 4:52 pm Post subject: |
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I've got to get under the hood. I just brought home a 40kV HT probe so I'll be able to actually measure the HT.
No, the pic mute does nothing.
I'll check all the lights and try to find the legend.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun Aug 24, 2008 4:54 pm Post subject: |
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If the scan fail is on, the HV is NOT on. It shuts down when there's a failure of the H or V board or other deflection issue.
I'll bet the moisture caused an arc which nuked the V board. That's pretty common.
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sun Aug 24, 2008 4:56 pm Post subject: |
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| Curt Palme wrote: | If the scan fail is on, the HV is NOT on. It shuts down when there's a failure of the H or V board or other deflection issue.
I'll bet the moisture caused an arc which nuked the V board. That's pretty common. |
Any visible signs I should look for (besides the LEDs?)
Are 800 series parts likely to work (not likely, but I'm up to my eyeballs in 801 parts!)
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Aug 24, 2008 5:14 pm Post subject: |
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Heres a pic I swiped from one of Ile's post on the leds on the G2 board. Your looking for a scan fail light or other anomalies.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun Aug 24, 2008 5:20 pm Post subject: |
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| Heywood Jablome wrote: | | Curt Palme wrote: | If the scan fail is on, the HV is NOT on. It shuts down when there's a failure of the H or V board or other deflection issue.
I'll bet the moisture caused an arc which nuked the V board. That's pretty common. |
Any visible signs I should look for (besides the LEDs?)
Are 800 series parts likely to work (not likely, but I'm up to my eyeballs in 801 parts!) |
Nope. There won't be any burnt parts or anything. THe 1208 V board is unique, don't put in an 801 V board, it will smoke.
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sun Aug 24, 2008 7:22 pm Post subject: |
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Scan fail is lit, but only very dimly. And, my new (to me) HV tester tells me that there is no HV to be had in the 1208/2 (will re-check shortly.)
I may have fried my 9PG testing the tester. *sigh*
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sun Aug 24, 2008 7:42 pm Post subject: |
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During the HV crackle phase of startup, the HV gets up to about 20kV measured at the splitter, then immediately falls off the scale of the tester. While this is happening the HT-HD LED begins off, comes up with the HV crackle, and stays on.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Aug 24, 2008 7:49 pm Post subject: |
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HTHD still being on probably only because its still getting horz deflection current. Scan fail is probably the more concern and like Curt said could be the vert board. Scan fail is causing HV shutdown.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun Aug 24, 2008 8:46 pm Post subject: |
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Tweak the H width pot on the SMPS. If that's off a bit, it can create exactly what you're saying. Scan fail LED should not be on at all, a dim or bright one will kill the HV.
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sun Aug 24, 2008 11:28 pm Post subject: |
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| Curt Palme wrote: | | Tweak the H width pot on the SMPS. If that's off a bit, it can create exactly what you're saying. Scan fail LED should not be on at all, a dim or bright one will kill the HV. |
The master width pot definitely effects the failure mode, but does not resolve it. I'm able to get the Scan Fail LED to come up solid and bright (typically it's very dim) at one extreme, and the PJ power cycles at the other extreme.
This thing was a part-out candidate before my neighbor blew it up. (This is the one where you expressed interest in specific paaaahhts.)
If I'm at the point of board swapping (and shipping back and forth across the continent) then this is again a part-out candidate. I'm much more interested in getting the Runco to salable condition and/or fixing my recently fried NEC 9PG Xtra (not to mention my 9501, which I need to finally wrap SOON.)
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Mon Aug 25, 2008 12:06 am Post subject: |
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Stop frigging around with those old projectors and put that Marquee back together first before you loose any parts 
Also, how's that little side bet panning out? I forgot to ask you when I was over this afternoon 
_________________
Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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