| Author |
Message |
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Wed Mar 18, 2009 11:23 pm Post subject: G70 Green Raster Wiggles |
|
|
Hi,
Recently the green output of my G70 started to have a distortion.
It wiggles... something is clearly not right.
I took the hush box down and re-seating everything I could find and it worked for about 2 weeks.
Then,... it just came back.
I have managed to get it right two or three times since but mostly now it stays wiggly.
Any ideas of where to look?
-Brian
|
|
| Back to top |
|
 |
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Thu Mar 19, 2009 12:57 am Post subject: |
|
|
|
Which way does it wiggle? Left, right or up, down? Or something else?
|
|
| Back to top |
|
|
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Thu Mar 19, 2009 1:43 am Post subject: |
|
|
It wiggles rapidly left right type of thing.
I've been able to temporarily fix it several times by inverting the image powering on the pj then shutting it down and flipping the image back over.
That's the way I fixed it last time and it lasted a week or two. I just tried it again and it worked but this time only for a few hours.
I'm thinking I will remove the little circuit board where you flip the connectors when you invert the image and try cleaning it and looking it over for possible damage.
It's unwatch-able when the problem is there and then beautiful again when it's gone.
I'm convinced the problem is either with that circuit board or with the wires that come and go from it but I haven't found any physical signs of damage yet.
-Brian
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
|
| Back to top |
|
|
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Thu Mar 19, 2009 12:04 pm Post subject: |
|
|
Yep.
I think either that small board has a problem or the harnesses going to or from it.
Seems I was able to get it to change touching those wires. (Dangerous place to have a loose wire by the way.)
That switch for inverting was pretty dusty last time I tried to clean it up... maybe it's just failing.
|
|
| Back to top |
|
|
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Thu Mar 19, 2009 1:38 pm Post subject: |
|
|
I took that assembly apart and cleaned it. I didn't see anything indicative of damage and the wiring looks good.
Didn't help though.
-Brian
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Thu Mar 19, 2009 2:12 pm Post subject: |
|
|
You probably have a problem on the Horizontal deflection board. Thats where those wire led to and the wiggle left and right would also be an indicator. Remove and install it a few times.Check it for bad connections, and solder joints. Other wise maybe a part breaking down (cap).
http://www.curtpalme.com/SonyG70_Layout4.shtm
|
|
| Back to top |
|
|
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Thu Mar 19, 2009 3:40 pm Post subject: |
|
|
Yeah,
I think you're right. Recently my horizontal board outright failed and I replaced it with one I bought used.
Maybe it's about time for the horizontal boards to be re-capped in these sets.
I think I see a cap my old HD board that looks like it may have blown....
-Brian
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Thu Mar 19, 2009 4:29 pm Post subject: |
|
|
|
Well there's not really a lot going on in the E board for this issue. I would look more at the EA board, which is the Horz centering amp.
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Thu Mar 19, 2009 4:56 pm Post subject: |
|
|
|
Oh, and just so your aware of it, the D board is involved there too. You did say that only the green is wiggling though, correct?
|
|
| Back to top |
|
|
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Thu Mar 19, 2009 11:55 pm Post subject: |
|
|
Only the green.... I haven't determined where those boards are yet... (I haven't memorized all the board names and locations.)
Maybe I'll see if I can pull those and have a look at them tonight.
-Brian
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Fri Mar 20, 2009 12:33 am Post subject: |
|
|
|
how consistent is the wiggling?
|
|
| Back to top |
|
|
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Fri Mar 20, 2009 10:53 am Post subject: |
|
|
It's violent and unwatchable. And it's either there or completely not there.
A test pattern doesn't look like the crosshatch wiggling for example there's noise about the vertical lines from quick movement horizontally and the lower part of the raster kicks off to the left.
It's bad.... And I'm not having much luck with re-seating boards to fix it. Well,... actually, I've "fixed" it maybe 4 times but eventually it comes back.... this all started at most 2 or 3 weeks ago.
-Brian
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Fri Mar 20, 2009 2:03 pm Post subject: |
|
|
Well you dont have very many options. You could just send a bunch of boards to Curt and see if he could reproduce it. If you dont have replacement boards to try and no one near you has any then you have to try to narrow down where the problem is coming from. If it was me, I would want to verify if I'm looking in the right place first. I would probably swap those 2 harnesses, green with red and see if the red now wiggles.
http://www.curtpalme.com/SonyG70_Layout1.shtm
Now, just remember that I have never done this on a G70, but I looked over the schematics and I dont see a problem with this, but your doing it at your own risk. So you have to decide. All you are actually doing is swapping the red and green horz deflection yolk.
|
|
| Back to top |
|
|
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Fri Mar 20, 2009 5:58 pm Post subject: |
|
|
I'm going to pull the lenses and if the tubes are still minty like they were last time I checked... I'm going to try to sell them.
-Brian
|
|
| Back to top |
|
|
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Sat Mar 28, 2009 12:41 pm Post subject: |
|
|
Hey,
This was definitely a poor connection somewhere. I took out the DC board and removed and replaced all the little daughter boards and it's working like new again.
-Brian
|
|
| Back to top |
|
|
ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
|
| Posted: Sat Mar 28, 2009 9:22 pm Post subject: |
|
|
Brian, glad you got your machine running perfectly again. When you said, "if the tubes are still minty like they were last time I checked... I'm going to try to sell them", did you mean you were going to part the G70 out? Switch to digital? What were you thinkin' about, there?
SC
|
|
| Back to top |
|
|
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Sun Mar 29, 2009 8:56 am Post subject: |
|
|
Crab,
I actually bought a digital pj and it's going to be here tomorrow. 
I figured it would be easier to sell the minty tubes from the G70 than to sell the G70 these days so I planned on that.
Now,... I simply don't know what to do. It would be a lot of work to put the G70 back up. I pulled out the hush box vent and such. On the other hand... I've got a custom hush box and a minty G70 and it's heavenly.
I certainly don't want to try to "return" the digital as the place I bought it from was a nightmare to work with and they charge a re-stocking fee as well.
I'm lost....too much confusion in the world I tell ya.
I was watching the G70 last night (have it temporarily mounted on a crate) and I'm sort of thinking it's the worlds best display device. I'm concerned about the black level (and even worse) digital noise from the VW60 I bought to replace it with.
There you have it... I've confessed,.... I may have become so confused that I wanted to kill the goose that laid the golden egg.
-Brian
|
|
| Back to top |
|
|
Brian Hampton
Joined: 22 Apr 2006
Posts: 1173
|
| Posted: Sun Mar 29, 2009 9:34 am Post subject: |
|
|
Hey,
You want to hear something funny .... or maybe it's just me who thinks it's funny.
The preacher at a local church is a friend of the family and after seeing my HT he was Wow-ed and asked about doing chuch movie nights here.
So,... I've been hosting movie night every month for the church (even though I'm a heathen and I don't go to church.)
He claims to want a pj for the church and wants a $500 model so I've found him a few refurbished LCD Pjs here and there and no one ever comes up with the money.
My wife wants to just outright buy them a pj.
So,...I had this crazy notion... Maybe, if selling it was going to be difficult, I would give my minty G70 to the church.
I am agnostic but I figured if there is some type of God then donating a minty G70 to a chuch has to be the best way to get into heaven.
-Brian
|
|
| Back to top |
|
|
ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
|
| Posted: Sun Mar 29, 2009 1:32 pm Post subject: |
|
|
Hey, I don't blame ya. I'm one of the (seemingly few) people around here who realizes there are actually some pretty good values in digital projection these days - and with significant advantages over CRT. The VW-60 is a great projector!
Don't worry about indecision or second-guessing yourself! Since the G70 is working again, now you can set the two machines up at the same time and switch back and forth. You can make a very informed decision on which you like best and whether the new machine is worth the money. I'll actually be very surprised if you don't find the few disadvantages to the VW60 easily worth the advantages. I love my G70, too... I love the film-like picture is awesome... But, if it broke, and I could afford a nice replacement in the league of the JVC RS2 or VW60, I'd probably make the switch, too. Getting rid of the loud G70 would be a HUGE audio upgrade all by itself. Plus, the VW60 has anamorphic stretch so you could do a bigger scope screen if you wanted - without spending big bucks on a processor.
Please do a write-up once you've had some time to do some testing. I can't wait to hear what you think! Good luck!
SC
|
|
| Back to top |
|
|
|
|
