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CX
Joined: 17 Oct 2007
Posts: 12
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| Posted: Wed Dec 08, 2010 1:35 am Post subject: Need advice on buying a Sony G70 |
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Ín a few days i'm gonna visit the seller,it has approx. 2500 hrs on tubes and chassis,sent me pictures of very clean tube faces but it's IFB-40 board is missing ,could that be a problem?
Anyway,were  to look for the overall condition of this crt
Any advice much appreciated.
CX
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Wed Dec 08, 2010 3:22 am Post subject: |
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Most people don't use an IFB-40. That is the slot they put a DVI/HDMI card in from WannMan, Moome etc.
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My Volt Blog
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Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
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| Posted: Wed Dec 08, 2010 11:46 am Post subject: |
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| AFryia wrote: | | a DVI/HDMI card in from WannMan |
I haven't tried one of those yet. Does it take a "poll" of the available sources and then just provide a lot of cryptic OT messages?
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jeffslife
Joined: 17 Apr 2010
Posts: 4190
Location: ohio usa
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| Posted: Thu Dec 09, 2010 3:15 am Post subject: |
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PM ECRABB ,if it is about a G70 he would be the guy I would ask, He would help you any way he could too, Nice guy,
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We are ALL job creators !
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betel
Joined: 20 Apr 2006
Posts: 448
Location: Maryville, Tennessee (Just South of Knoxville)
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| Posted: Thu Dec 09, 2010 3:30 am Post subject: |
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I have an extra Moome DVI card for that projector if you're interested. I figure it's worth about $100.
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CX
Joined: 17 Oct 2007
Posts: 12
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| Posted: Mon Dec 13, 2010 12:37 am Post subject: |
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Thanks for the replies.
Visited the seller,everything looked fine, maybe it looked a bit dimmer then my friends Nec 135 non LC.
The faces of the the tubes looked very clean,but the settings for contrast and brightness were pretty high;75 contrast 78 brightness.
And maybe the picture had some flicker more then i'm used to,he was running it at 1920x1080@48hz.
The set has run about 2500 hrs but is it possible they already dimmer with still clean tube faces?
The seller explained this was caused by edgeblend setup,because he used to run 2 G70's.
As he's not familiar with this kind of callibration as it was done by a tech, he couldn't correct it(neither could i).
Could that be the reason and if so how to correct it ?
thanks, 
Cx
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Mon Dec 13, 2010 2:21 am Post subject: |
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.
Last edited by Elaine Benes on Mon Dec 13, 2010 4:13 am; edited 1 time in total
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CX
Joined: 17 Oct 2007
Posts: 12
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| Posted: Mon Dec 13, 2010 3:17 am Post subject: |
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| Elaine Benes wrote: | Ugghhh.
Just my personal opinion, of course, but 48Hz is TERRIBLE, totally unwatchable.
I'd be shocked at anyone thinking a crt projector looked good at that resolution... |
Oh dear, attention everybody: definitely not looking good, again a TERRIBLY 48Hz Shocked ....1080PPerson, but nevertheless thanks anyway 
Next please 
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Mon Dec 13, 2010 3:24 am Post subject: |
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So don't run it at 48Hz. The projector displays whatever you feed it. Run it at 60Hz or even better 72Hz. It'll look better, and I bet it will be brighter too. The electron gun sweeps the screen faster and paints it more times per second, so it should put out more light. (I don't *think* they modulate the gun to reduce the brightness at higher scan rates!) Might not get that much more light out of the green, since it has fairly long persistence (unless it's a P73 fast-phosphor tube), but I would think the red and blue would put out more light.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Mon Dec 13, 2010 6:39 am Post subject: |
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CX, got your PM...
A few thoughts...
You thought it looked dimmer than your buddy's XG, but unless you evaluated it on the identical screen size and material, the comparison isn't worth much.
Yes, 75 contrast/78 brightness sounds high. However, brightness can be skewed that way if it's a G70 with the older firmware and AKB is off. On those, if you turn off AKB, you'll have to crank up G2 and/or brightness to compensate. The contrast... I run mine around 65, and if the screen were lower gain and/or any larger, it could end up at 78.
Are you sure the tubes are clean? At 2500 hours, most G70's are going to show some wear. I don't think mine even has 1500 hours on it, and it's just starting to show a little wear on the green. How did you evaluate it? Did you remove the lenses and look with a flashlight? The reason it would concern me, is if it really was used in an edge-blended setup, then it could have some funky uneven wear. Not necessarily, but I'd want to check it out closely.
48hz is just going to flicker. I don't see how anybody can watch at 48hz, eiither.
I run 1080p/60 because I don't want to mess with a scaler at this point. I rarely ever see pulldown judder, so no reason to push bandwidth and go to 72hz. If I ever get a dedicated scaler, I'll try active area scanning for scope at 72hz, but that's a subject for another thread.
Questions? Ask away.
SC
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CX
Joined: 17 Oct 2007
Posts: 12
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| Posted: Mon Dec 13, 2010 11:00 am Post subject: |
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| ecrabb wrote: | CX, got your PM...
A few thoughts...
You thought it looked dimmer than your buddy's XG, but unless you evaluated it on the identical screen size and material, the comparison isn't worth much.
Yes, 75 contrast/78 brightness sounds high. However, brightness can be skewed that way if it's a G70 with the older firmware and AKB is off. On those, if you turn off AKB, you'll have to crank up G2 and/or brightness to compensate. The contrast... I run mine around 65, and if the screen were lower gain and/or any larger, it could end up at 78.
Are you sure the tubes are clean? At 2500 hours, most G70's are going to show some wear. I don't think mine even has 1500 hours on it, and it's just starting to show a little wear on the green. How did you evaluate it? Did you remove the lenses and look with a flashlight? The reason it would concern me, is if it really was used in an edge-blended setup, then it could have some funky uneven wear. Not necessarily, but I'd want to check it out closely.
48hz is just going to flicker. I don't see how anybody can watch at 48hz, eiither.
I run 1080p/60 because I don't want to mess with a scaler at this point. I rarely ever see pulldown judder, so no reason to push bandwidth and go to 72hz. If I ever get a dedicated scaler, I'll try active area scanning for scope at 72hz, but that's a subject for another thread.
Questions? Ask away.
SC |
"And maybe the picture had some flicker more then i'm used to,he was running it at 1920x1080@48hz."
I did notice and/or mentioned it i believe as something different or not right,but then again i've seen so much set ups far far worse..luckily not mine i must add.
Ecrapp
Thanks for your quick and good response.
The tubes were checked with the lenses off,with lc tubes it is not as easy to check like ac tubes but i couldn't see any wear.
Also checked it with all white screen with masking off and no wear seen there either ,but being used in a edge blended set up it was weird checking it.
And i promise when i buy it, won't run it at 1080p 48hz 
thanks again,
CX
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Mon Dec 13, 2010 6:52 pm Post subject: |
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| CX wrote: |
Ecrapp
Thanks for your quick and good response.
The tubes were checked with the lenses off,with lc tubes it is not as easy to check like ac tubes but i couldn't see any wear.
Also checked it with all white screen with masking off and no wear seen there either ,but being used in a edge blended set up it was weird checking it.
And i promise when i buy it, won't run it at 1080p 48hz
thanks again,
CX |
That is funny!
I think I have only seen a couple of Europeans who have run 48hz. I agree with everyone else here that the flicker would drive me crazy.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Mon Dec 13, 2010 9:16 pm Post subject: |
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Hehe hehe... Yeah I saw that. I've been called way worse than ecrapp... 
The europeans would probably run 50hz (double PAL's 25hz), so it would probably be marginally more tolerable than 48hz.
SC
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Mon Dec 13, 2010 9:20 pm Post subject: |
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| CX wrote: | The tubes were checked with the lenses off,with lc tubes it is not as easy to check like ac tubes but i couldn't see any wear.
Also checked it with all white screen with masking off and no wear seen there either ,but being used in a edge blended set up it was weird checking it.
And i promise when i buy it, won't run it at 1080p 48hz |
Weird. A G70 with 2500 hours on it and zero wear would be pretty rare IMHO. Not that it can't happen, but the thing must have been driven pretty lightly, or perhaps was left on a lot with no picture or something.
Oh, and you can run it at whatever refresh you want - it'll be your projector!!!
SC
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CX
Joined: 17 Oct 2007
Posts: 12
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| Posted: Wed Dec 15, 2010 3:02 am Post subject: |
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| ecrabb wrote: | | CX wrote: | The tubes were checked with the lenses off,with lc tubes it is not as easy to check like ac tubes but i couldn't see any wear.
Also checked it with all white screen with masking off and no wear seen there either ,but being used in a edge blended set up it was weird checking it.
And i promise when i buy it, won't run it at 1080p 48hz |
Weird. A G70 with 2500 hours on it and zero wear would be pretty rare IMHO. Not that it can't happen, but the thing must have been driven pretty lightly, or perhaps was left on a lot with no picture or something.
Oh, and you can run it at whatever refresh you want - it'll be your projector!!!
SC |
Oeps what a typo, but terribly sorry for your new name.
Thanks again for your support
Found this:
"1080p48 with reduced porches is OK on G70
Try these parameters in Powerstrip:
Freq.H = 53.946KHz
Sync.V = 47.952Hz
Pixel rate = 118.681MHz
Syncs = H+/V+
Hsize=1920
Vsize=1080
Porchs values :
H_Front=88
H_sync=44
H_Back=148
-----------
V_Front=4
V_sync=5
V_back=36
With these parameters while watching HD, it's very difficult to see the 48Hz flicker at 1080p48"
Any thoughts?
Also found that there could problems with the eprom/Dallas chip which must be replaced right away?
Caps on the DC should also be replaced to prevent convergence problems?
CX
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