AVS Forum banner
Status
Not open for further replies.
1 - 20 of 21 Posts

·
Registered
Joined
·
154 Posts
Discussion Starter · #1 ·
i did a search but could not find the info i need, so here is my problem:


when i set powerstrip to the predefined 640x480 60hz setting, i get picture just fine. but when i set it to say the 720x480 (HDTV standard) resolution that is predefined by Powerstrip, the picture flashes for a second and then shuts off. same thing happens when i connect the 1031q to my MyHD 1080i monitor output. i'm assuming it's because i have my resolution set too high, but i read about a lot of people who are able to run 1080i. i even checked my scan rate and it's never above 32khz. can anyone help me out? thanks in advance
 

·
Registered
Joined
·
6,226 Posts
have you checked what you're trying to sync to when that is happening..as far as the negative, positive setting...you should be able to do 720x480 with your eyes closed!!! really sounds like a sync setting issue... never tried 1080i..


brickie
 

·
Registered
Joined
·
154 Posts
Discussion Starter · #3 ·
yea, in powerstrip i checked both of those polarity boxes to negative. =\\


could someone post their working powerstrip settings by chance? thanks
 

·
Registered
Joined
·
154 Posts
Discussion Starter · #4 ·
i should also mention that i am using an aopen geforce4 mx...which i heard cannot do composite sync. but i have the rgb2 adapter made by jason berg, so it should be ok right? thanks in advance


newton
 

·
Registered
Joined
·
16,796 Posts
Hey Newton ,

-- got your e-mail

-- will try to help as soon as I can , if the adapter is working with 640x480p then it is working properly [ the problem is either the PJ or your HTPC/settings ] .

--- There is an adjustment pot that can have an effect upon the scan rate limitation of the 1031Q .

--- Be sure it is a 1031Q and not a 1030Q1 ;) .

------ Jason
 

·
Registered
Joined
·
154 Posts
Discussion Starter · #6 ·
i checked the serial # on the projector and it is 5005392, manufactured in April 1991. from what i've read, the 500xxxx projectors are limited to 32khz, has this been confirmed? thanks


edit: i checked another label on the base of the projector, and on the left side of the label it says VPH-1031Q, but on another part of the same label it says the FCC ID AK896AVPH1030Q1. does this mean i'm doomed? if so i'm a little bummed because when i bought the projector the description said it would "project HDTV." maybe i misunderstood? :(
 

·
Registered
Joined
·
102 Posts
My 1031q has a serial # of 5003920, manufactured in March 1990.


It also has the label on the base of the projector, and on the left side of the label it says VPH-1031Q, but on another part of the same label it says the FCC ID AK896AVPH1030Q1.


I have no problems with 1080i (two frames of 960 x 540p).


You should be good.
 

·
Registered
Joined
·
198 Posts
Two things to test:


1) Can you get 720x480 @ 60Hz to work on a CRT monitor, even though you have trouble with the 1031q? If that doesn't work then the problem is not with the projector!


2) Make sure that you haven't checked the the "composite sync" button in powerstrip. This must not be selected - you might get an image with a computer monitor, but not with a 1031q.


Pete
 

·
Registered
Joined
·
2,112 Posts
Sounds like you have a 1031Q. Does small black sticker on the side of the projector say "Model No. VPH-1031Q"? As JJPLIN indicated, Sony makes it a little confusing at first if you look in the wrong spot for what kind of pj it is. That said, I'm pretty sure someone did 720x480p @ 48Hz on a 26KHz 1030Q.
 

·
Registered
Joined
·
5,034 Posts
Oh, wait, that is what is missing here, 48hz!!!


Try 48hz NOT 60


It should have done 1080i though.


Troy
 

·
Registered
Joined
·
198 Posts
Troy,


No, if it really is a 1031q (as stated in an earlier post), 1080i @ 60 Hz should be fine - below the 36 kHz scan rate limit.


I'll put a dollar on it being a powerstrip / composite sync setting problem.



Pete
 

·
Registered
Joined
·
16,796 Posts
-- Actually the 1031Q can do [email protected] just fine [ no need for 48Hz ] .

-- 1920 x 1080i does not run at 60Hz .

-- The 1031Q can operate just fine with Composite checked but you do not need it with the Adapter that I build as it is wired for Composite sync [ which the 1031Q requires ] .

-- Be sure to try and add the custom resolutions yourself and check the Negative H & V sync after you have rebooted [ be sure the settings are sticking ] .

-- If you have sync issues then it might be of major benefit to grab yourself an Extron interface off ebay . These units can sync almost anything to your 1031Q [ as long as it is not above the 36 khz limit ] .

----- Jason
 

·
Registered
Joined
·
5,034 Posts
It sounded fishy on 1031 vs 1030. Maybe he has 1030 boards in a 1031 case, you seriously never know.


obviously it isn't working at 60hz, so it can't hurt to try 48.


I know it SHOULD work, but he says it isn't.


Troy
 

·
Registered
Joined
·
16,796 Posts
Troy ,

-- I certainly agree that 48Hz should work and is worth a try if 60Hz is not working [ after all some people prefer 48 Hz to 60 Hz - I did for a while actually but the more I adjusted to it the more I noticed the flicker :( ] .

--- Jason
 

·
Registered
Joined
·
154 Posts
Discussion Starter · #15 ·
first off, let me thank everyone for offering their suggestions, i really appreciate any and all help that you guys can give me. i love this forum.


could someone explain what composite sync is? newton = newbie


i played some more with my 1031q today, and i am beginning to believe that the picture drops out because of front and back porch settings. the reason is because i was playing around with 640x480 @ 60hz, and noticed when i altered the porch so that the image came near the edge of the raster, the picture blacked out. when i say i altered the porch, i just mean pressing the arrow buttons in powerstrip to increment/decrement. the tough part is, when i feed my 1031q any res above 640x480, the image is already overflowing past the raster, and the projector can't seem to lock on to the signal long enough so i can dart my mouse over to adjust the porch. i'm not entirely sure that i've nailed the problem, but this is the best explanation i can come up with for now.


the resolutions i've tried are 720x480 @ 48hz and 60hz, and 1080i from my MyHD hdtv tuner card. does anyone have any working Powerstrip settings for 720x480 @ 48hz and 60hz? i would greatly appreciate this info; i've done a search but only found settings for PAL dvds.


bravozulu: yes, 720x480 @ 60hz works on my CRT monitor. i do not have access to the composite sync checkbox--it is grayed out. i'm using the latest 45.23 detonator drivers for my geforce4 mx 440. i have a radeon 9800 on the way (backordered).


myoung: yes, the other part of the sticker does say Model VPH-1031Q.


jason: i will definitely look into an Extron box off ebay. what model do you or other 1031q owners use? i guess i'll go do another search on this forum now :)


with that all said, this is my first CRT, and i've managed to tweak it to get a very nice image at 640x480. to my eyes, this is miles better than any digital projector i've witnessed (dlp and lcd), where black is really black. but i know this machine is capable of more!


thanks again for all your help


newton
 

·
Registered
Joined
·
198 Posts
Damn. Lost a dollar. Double or quits?


My new theory is that your sync pulse at 720 x 480 is too short. Have a look at powerstrip, you'll see the durations of the horizontal sync pulse, front porch, active area and back porch. This corresponds to one vertical line that makes up your image: The sync pulse says "start drawing the line now", there is a breif pause for the electron beam to get to the right point on the screen, then the active area when the image data for that line is sent, another pause, then the cycle starts again for the next line.


This happens 480 times per frame (at 640x480p) to produce one complete image, and this in turn happens sixty times a second (at 60 Hz).


I think that you need larger porch and sync settings - I saw the same issue on my 1031q, the image overlapped the raster and went a bit dim. The solution was to make the porches bigger and the active (image) area smaller, squeezing the image data into a shorter time window.


My powerstrip settings are shown below. This is for 848x480, which gives a 16:9 display. The porch settings are _much_ larger than the default powerstrip settings, I was surprised by how much I had to increase them. Be very careful when you make these changes, don't let the scan rate go over 36 kHz. I made my changes on a CRT monitor, checked that the timings were the same as for 640x480, then fired up the PJ.



Incidentally, I'm using 848x480 instead of 720x480 as this gives a 16:9 windows desktop. Purists will use a 720x480 desktop and set the aspect ratio of the display to 16:9 - great for watching DVDs, not so great for non-dvd (is. computer) use. This is all due to the non-square pixels of a DVD image.



As for composite sync - your graphics card has two outputs for sync pulses (horizontal and vertical), and three outputs for image signal intensity (red, green and blue). The 1031q has one sync input and three color inputs. The graphics card's two sync outputs are connected to the same input on the 1031q - in effect they are "composited" (combined) together. An alternative method of combining the horizontal and vertical sync data is for the graphics card to generate only one signal via one output. This is called "composite sync", and whilst it may well work with your computer monitor, it'll just confuse your 1031q. Thus in powerstrip, make sure that that the composite sync checkbox is unchecked.


Pete



PowerStrip timing parameters:

848x480=848,148,120,164,480,5,5,25,39552,278


Generic timing details for 848x480:

HFP=148 HSW=120 HBP=164 kHz=31 VFP=5 VSW=5 VBP=25 Hz=60


Linux modeline parameters:

"848x480" 39.552 848 996 1116 1280 480 485 490 515 -hsync -vsync
 

·
Registered
Joined
·
154 Posts
Discussion Starter · #17 ·
i haven't had a chance to try the powerstrip settings yet, but i was wondering if you had any suggestions on getting 1080i to work properly?


edit: jason, what was the adjustment pot that you mentioned earlier? could this have an affect on being able to accept 1080i properly? thanks


newton
 

·
Registered
Joined
·
16,796 Posts
Newton ,

-- the "High Freq" pot is on the [DA] board which is under the main convergence board [DB] . You have to remove 2-3 screws and the board itself will flip up then there is a little metal arm that swings up to hold the board open . The H.Freq pot is almost in the center of the board more towards the back of the PJ .

-- I should add that the RGB V.Size pot is there as well as the blanking controls [ on the DA board ] .

-- Have you visited Larry's 1031Q site ?

---- Here : http://www.eboyztoyz.net/1031q/pages...tup_Guide.html


----- Jason
 

·
Registered
Joined
·
154 Posts
Discussion Starter · #19 ·
hallelujah! adjusting the high freq pot did it! thank you so much everyone for your help i love this forum
 

·
Registered
Joined
·
54 Posts
This the first time I've heard of this "High Freq" pot! Hopefully this will solve the problem with my 1031q not being able to display 960x540. It get's garbled on anything over 32khz. I was too scared to do more testing on this as I didn't want to let the genie out :)


I did a search on the forum and looked through Larry's site and still no mention of the H.Freq pot until now.


What exactly does this pot do? Does it limit the scan rate so you don't fry some electronics?


Thank you for the new info!

Alan
 
1 - 20 of 21 Posts
Status
Not open for further replies.
Top