PVM 1943MD Horizontal Position Adjust

[Tempest_2084]

I have a PVM 1943MD that has a slight issue with the position of the image. The image is slightly too far to the left and is not centered. I've tried adjusting the knob labeled horizontal position on the back, but it didn't seem to do anything. Is this because I'm using the RGB input or is it something else? It seems to be pretty consistent across all my systems, but some are worse with it than others. Oddly the Genesis is perfectly centered (or nearly so).

Is there another way to adjust the horizontal position or is it just that one dial in the back? Why doesn't it seem to do anything?

[Thamiel]

From memory that dial is used for when you hook up an old PC or something. Does that model have an OSD? If so use that, otherwise the only way is to use the horizontal position pot on the chassis.

[chromium]

I have a PVM 1943MD that has a slight issue with the position of the image. The image is slightly too far to the left and is not centered. I've tried adjusting the knob labeled horizontal position on the back, but it didn't seem to do anything. Is this because I'm using the RGB input or is it something else? It seems to be pretty consistent across all my systems, but some are worse with it than others. Oddly the Genesis is perfectly centered (or nearly so).

Is there another way to adjust the horizontal position or is it just that one dial in the back? Why doesn't it seem to do anything?

I have the same issue on my PVM-2730QM. I also think the picture is a bit too wide.
I guess my only option is to take the back off and look for trimpots to adjust it.

[Tempest_2084]

From memory that dial is used for when you hook up an old PC or something. Does that model have an OSD? If so use that, otherwise the only way is to use the horizontal position pot on the chassis.

That's what I was afraid of.

I don't believe this one has a OSD (not that I've seen anyway). Is the position pot easily accessible if I take off the back cover? I don't mind opening it up, but I really don't want to go touching the tube itself.

[Thamiel]

If it's anything like the early 90's PVMs i've had then yeah, it's not hard to get to. Problem is your going to have a bit of horizontal shift with each console.

[Tempest_2084]

If it's anything like the early 90's PVMs i've had then yeah, it's not hard to get to. Problem is your going to have a bit of horizontal shift with each console.

Yeah I noticed that it wasn't exactly the same between the consoles, but if I move it a bit to the left it should fix the problem in 90% of them. I'll just have to play around with it and find the sweet spot. Is this something I can do with the monitor on if avoid the tube and anode cap, or is this in a bad spot to do that with? I adjusted my old Macintosh Classic this way, but that monitor was waaaay smaller.

[Thamiel]

Has to be done while on, otherwise you won't know if you've adjusted it correctly. Helps to set it up in front of a mirror. Just be careful, take it easy and you'll be fine.

[Tempest_2084]

Has to be done while on, otherwise you won't know if you've adjusted it correctly. Helps to set it up in front of a mirror. Just be careful, take it easy and you'll be fine.

Two more questions:

1. Is the adjust knob pretty obvious (is it labeled?)?

2. What causes each system to be slightly different in their positioning? Is it the resolution they play at? Like I said, most of them were way left (Saturn, SNES, SMS, etc.) but some were less off center (Genesis, Neo Geo, Dreamcast).

[chromium]

Let me know how you go with this because I need to do the same

Everything is too far left, so I always lose a centimetre or so of the left side. I could probably do with adjusting the horizontal width slightly too.

I'm a bit scared playing around inside CRTs, especially if they are switched on!

[cjug]

Try entering Service Mode. Press Menu, then press and hold Enter, then press Degauss. Once in Service Menu, scroll the menu until you find the option(s) you need, something like

NOR 60 DEF 174 5
VIDEO PHASE

and

NOR DEF 122 8
H SIZE

Adjust them (+ / -). If you want to save the adjustments, press Degauss, it will show "WRITE". Press Degauss again. This saves every change you may have done.

[Thamiel]

Has to be done while on, otherwise you won't know if you've adjusted it correctly. Helps to set it up in front of a mirror. Just be careful, take it easy and you'll be fine.

Two more questions:

1. Is the adjust knob pretty obvious (is it labeled?)?

2. What causes each system to be slightly different in their positioning? Is it the resolution they play at? Like I said, most of them were way left (Saturn, SNES, SMS, etc.) but some were less off center (Genesis, Neo Geo, Dreamcast).

1. I think it's called H pos.

2. No idea on the technical explanation, I think it has something to do with the various consoles using slightly different variations of the 15kz signal. Definitely a bunch of guys here more qualified than me to answer that one.

[chromium]

Try entering Service Mode. Press Menu, then press and hold Enter, then press Degauss. Once in Service Menu, scroll the menu until you find the option(s) you need, something like

NOR 60 DEF 174 5
VIDEO PHASE

and

NOR DEF 122 8
H SIZE

Adjust them (+ / -). If you want to save the adjustments, press Degauss, it will show "WRITE". Press Degauss again. This saves every change you may have done.

No OSD on these monitors, at least not on mine. It doesn't even have a Menu or Degauss button. The only way to adjust will be the pots inside. I just need to figure out what does what, I've seen the inside of mine and there are a lot there. I think some might be labelled.

[22point8]

https://drive.google.com/file/d/0B_p3a0 ... sp=sharing theres the service manual for the 2042qm & 2044qm, which should be very similar inside.

[chromium]

So, I just had the back off of my PVM-2730QM. There are a lot of pots easily accessible, but unfortunately none of them are for horizontal size or position.
Those ones are located on the inside of a circuit board facing towards the tube. No idea how I'm supposed to get to those without removing the circuit board and even less sure how I'm supposed to adjust them while the set is on

[Tempest_2084]

I also opened up the back of my PVM (1943MD) and couldn't find the correct pot. There are a bunch in the back near all the inputs. They're labeled:

H-Size
U/H Size
Pin Amp
Pin Phase
Bow
V Ang
V ??? (blocked by plastic)
V Pin ??? (blocked by plastic)
H ??? (blocked by plastic) - Tried this and it appears to adjust the horizontal screen width, but it doesn't change the position just how much is displayed
V ??? (blocked by plastic) - I assume this is the vertical version of the horizontal adjust above

There appear to be 12 adjusts in total, but only 10 are labeled? There are are a bunch of RV5xx also listed in between the adjusts, not sure what those are (resistors?). The last two are bigger and blue, not sure if that means anything.

Here's a pic of the insides (sorry for the large blurry picture):

[22point8]

[chromium]

One of them should do it. You're lucky, at least you can get to those pots.

I found the service manual for mine and the ones I need are inaccessible without removing a circuit board, which I'm hesitant to do as I don't really know what I'm doing.
I can't find any instructions on how to do it.

Anyone have any idea?

Here's the service manual

https://www.dropbox.com/s/1ur1c6amcwtei ... 2730qm.pdf

I need to get to board D, which has the pots on the wrong side for them to be accessed easily.

[Tempest_2084]

I assume H-Center is the adjust in after. I'll take a look tomorrow. I hope it's acessable.

[chromium]

I assume H-Center is the adjust in after. I'll take a look tomorrow. I hope it's acessable.

Yeah, yours looks easy to get to.

[22point8]

H-Phase is the one to go for, the service manual doesn't refer to the h-centre at all and the location of it would be somewhere under the tube so you'd have to pull the whole A board out like the service position diagram.

[Tempest_2084]

H-Phase is the one to go for, the service manual doesn't refer to the h-centre at all and the location of it would be somewhere under the tube so you'd have to pull the whole A board out like the service position diagram.

Actually the knob was next to the tube and was a big tall hand adjust rather than one of those flat knobs. It seemed to center the picture quite nicely. I'm not sure what that H-Phase would do. Is that the one that adjusted how much of the picture was being shown (I tried that one first)?

Actually, that does remind me of something. I seem to have about a 1/4 of an inch of blackness on the sides of the screen, like the picture doesn't go 100% to the sides. Is this normal (I'm using RGB on my Saturn right now)? I'm assuming this is some sort of overscan area as it is blue when I play stuff on my Genesis like Sonic (and centered a bit differently), but I wanted to make sure that I'm not cheating myself out of screen real estate.

[chromium]

H-Phase is the one to go for, the service manual doesn't refer to the h-centre at all and the location of it would be somewhere under the tube so you'd have to pull the whole A board out like the service position diagram.

Actually the knob was next to the tube and was a big tall hand adjust rather than one of those flat knobs. It seemed to center the picture quite nicely. I'm not sure what that H-Phase would do. Is that the one that adjusted how much of the picture was being shown (I tried that one first)?

Actually, that does remind me of something. I seem to have about a 1/4 of an inch of blackness on the sides of the screen, like the picture doesn't go 100% to the sides. Is this normal (I'm using RGB on my Saturn right now)? I'm assuming this is some sort of overscan area as it is blue when I play stuff on my Genesis like Sonic (and centered a bit differently), but I wanted to make sure that I'm not cheating myself out of screen real estate.

Nice work! You probably just need to adjust the H. SIZE now.

So can anyone help me with mine? Might start my own thread and take some pics of the inside.

[Tempest_2084]

Doing some more testing, I really can't play with the H-Size. Each system is centered differently, if I max out the screen for one, another will be cut off. That's the way it goes I suppose.

[Ed Oscuro]

Yeah, don't stress over it. Unless this model supports memory settings (which I doubt given its type and age), the best you can do is to max out one system, and leave all the others at various underscan settings - unless you want to change things every time you switch systems.

[chromium]

I've got an Extron 203 rxi that has horizontal and vertical position adjustments but I can't get it to work with any of my SCART devices.

Anyway, I had the pack off of my PVM again, had to remove a lot of things from the TV and move the circuit board I needed to get to. I finally managed to get to the H.CENT POT. I didn't dare move it while the TV was on due to how hard it was to get to, so I moved it a bit while the TV was off and then turned it on to check the result. Did that a couple more times until I was happy with it. All good now

So far I've tried my SNES and N64 and they look pretty much perfect.

One day I'd love to do an external POT mod so I can have all these controls on the front of the PVM. That would be the ultimate

Do the newer digital PVMs allow you to control these settings via a service menu?

[Thamiel]

Sure do.

[cjug]

Do the newer digital PVMs allow you to control these settings via a service menu?

Yes, my post above applies to newer ones.

[chromium]

Sure do.

Damn, now I need one of those

[Thamiel]

Sure do.

Damn, now I need one of those

Just get your 203xi working.

[chromium]

Sure do.

Damn, now I need one of those

Just get your 203xi working.

Yeah but that only does position, not size.

I was using GroovyMAME yesterday and some games were way too wide or tall. Need size adjustments for those