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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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NewbieDAN
Joined: 09 Mar 2006
Posts: 319
Location: Bunbury Western Australia
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| Posted: Tue Oct 16, 2007 4:15 pm Post subject: |
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Yah...
about time....thanks Guys
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Sorting the fly sh*t from the pepper
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Rusty
Joined: 07 Mar 2006
Posts: 108
Location: Norway
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| Posted: Tue Oct 16, 2007 5:32 pm Post subject: |
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Thanks 
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Sony VPH-G70Q
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scottap
Joined: 27 Mar 2007
Posts: 177
Location: Palo Alto, CA
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| Posted: Tue Oct 16, 2007 8:25 pm Post subject: |
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So it seems from reading through the guide that the PA board is prone to failure and if it does fail, you're f*ck*** (I believe that's the technical term for it).
Is that about right or short of sending in the entire projector for recalibration is there another solution?
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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: Tue Oct 16, 2007 8:31 pm Post subject: |
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No, the PA board can be tested and repaired. THe HV pots are sealed on each board, so unless you're replacing parts in the HV regulator section (I haven't had to yet), you'd be fine with no HV calibration needed. THe NEC XG projectors are the same. Each board is calibrated specifically to the set and while ONCE IN A WHILE another HV board will work fine, most will end up with too high or too low HV, causing either an out of focus image, not a lot of brightness (or too much) and in the case of excessive HV, shattering a tube.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Oct 16, 2007 8:54 pm Post subject: |
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It's cool that you guys are continuing to add to the site. If there was ever a PJ that need a legible common sense set-up guide it's the G70. The last one I tried to set-up almost wound up under my sledge hammer. 
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scottap
Joined: 27 Mar 2007
Posts: 177
Location: Palo Alto, CA
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| Posted: Tue Oct 16, 2007 8:56 pm Post subject: |
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So I guess I misread the setup guide. For the most part you can have a backup G70 for parts and should be able to swap out boards to keep it running. Correct? Also are there revisions to the G70 like there are with the XGs, or does one G70 board work with any other G70 (with the exception of the HV regulator section)?
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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: Tue Oct 16, 2007 9:50 pm Post subject: |
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You didn't really read it, did you? 
(the CPU boards will only interchange in pairs if the software revision isn't identical.)
Dragan, the Sony setup manual is well written, what's the issue with it? I like the Sony and Barco manuals the best, Marquees second, and the NECs... well, let's not talk about the NECs.
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scottap
Joined: 27 Mar 2007
Posts: 177
Location: Palo Alto, CA
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| Posted: Thu Oct 18, 2007 6:54 pm Post subject: |
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| Curt Palme wrote: | You didn't really read it, did you?
(the CPU boards will only interchange in pairs if the software revision isn't identical.) |
Well I may be dim, but I'm not.... okay I'm dim. But for the mouth breathers in the audience like myself who need things explained to them extra slooowly, I just want to make sure I'm understanding this correctly. Most parts in a G70 can be swapped with those in a parts machine. In the case of the CPU boards though, you would need to switch both at the same time unless they have the same software revision.
Here's a related question(s): Can the software be updated? Is there a difference between versions where one is more desirable than another?
Other than the PA board everything else is interchangeable. Correct?
| Curt Palme wrote: | | No, the PA board can be tested and repaired. THe HV pots are sealed on each board, so unless you're replacing parts in the HV regulator section (I haven't had to yet), you'd be fine with no HV calibration needed. THe NEC XG projectors are the same. Each board is calibrated specifically to the set and while ONCE IN A WHILE another HV board will work fine, most will end up with too high or too low HV, causing either an out of focus image, not a lot of brightness (or too much) and in the case of excessive HV, shattering a tube. |
I think what confused me from your writeup about the PA board is that I initially got the impression you were talking about one board, when actually you're talking about several boards (high voltage regulator board, HV driver board, etc.). You write that PA boads are prone to failure and can't simply be swapped with PA boards from other sets. At the same time you're saying in your reply that the HV regulator board, the part that needs HV calibration, rarely fails. Is the bottom line that what you're calling the PA board is actually several boards that are all of one piece and if part of it fails the whole piece has to be sent in for repair as opposed to swapping just the bad part of the board?
Or something like that?
Last edited by scottap on Thu Oct 18, 2007 11:50 pm; edited 1 time in total
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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: Thu Oct 18, 2007 11:10 pm Post subject: |
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Software update- do at your own risk. It's a firmware upgrade, not just a software upgrade, and the older software is actually more flexible from what I understand.
PA board- bad wording on my part, the high voltage regulation, G2 controls and several power supplies are all on the Pa board. It's only the HV regulation section that has the pots on it, but of course that affects the operation of the set significantly. SO while you can swap Pa boards to test the projector, it's not something I'd swap out and leave without making sure the HV section is aligned, which requires a 40Kv probe. (and a lack of fear of 34,000 volts.. )
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scottap
Joined: 27 Mar 2007
Posts: 177
Location: Palo Alto, CA
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| Posted: Thu Oct 18, 2007 11:32 pm Post subject: |
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So it sounds like parts can be swapped between G70s except for the PA board which really should be repaired (unless you have a death wish and try to calibrate the replacement board). 
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri Oct 19, 2007 3:12 am Post subject: |
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| Curt Palme wrote: | | No, the PA board can be tested and repaired. THe HV pots are sealed on each board, so unless you're replacing parts in the HV regulator section (I haven't had to yet), you'd be fine with no HV calibration needed. THe NEC XG projectors are the same. Each board is calibrated specifically to the set and while ONCE IN A WHILE another HV board will work fine, most will end up with too high or too low HV, causing either an out of focus image, not a lot of brightness (or too much) and in the case of excessive HV, shattering a tube. |
If the HV board calibration is anything like an XG, then you don't really need a HV probe, provided the projector is functioning otherwise, and FOCUSED.
When you swap an uncalibrated HV board in, the electronic focus will be completely wrong, but when you adjust the HV to the correct level the focus will snap into place.
At that point the HV level is the same as the old board, at least. I did this and then checked it with a HV Probe and found it was bang on the 32kV required for a NEC (so my old HV board was correctly adjusted).
If the projector isn't electronically focused to start with, this won't work.
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Phil Smith
Joined: 08 Mar 2006
Posts: 7717
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| Posted: Sat Oct 20, 2007 7:42 pm Post subject: |
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Great job Curt! G70 owners everywhere thank you!
| scottap wrote: | | But for the mouth breathers in the audience like myself who need things explained to them extra slooowly... |
That's funny! I've never heard that before.
For people like me that have allergies and sometimes breath thru their mouth because they can't breath thru their nose, that's politically incorrect! 
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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