Re: Dell (sony) P991 trinitron troubles

I used the method suggested by PlainBill to use the windas software and interface, and it worked! Finally I have some success with something! I still need to tweak it more, but I would rather edit numbers in a file than soldering resistors on a board engineered by engineers at Sony.

Drinkin Time!

Re: Dell (sony) P991 trinitron troubles



That's absolutely beautiful! I was afraid these screens would be a terrible waste but now I have hope. I also didn't realize that the 'color return' feature was actually a /cause/ of the problem! I didn't even know the feature existed until today, when I found the manual for a similar Trinitron (dell P990 (*1)), and used it to no good effect. I was also afraid the software might be totally unavailable. I found the service manual for the monitor, and it shows two adjustments on the flyback; H-focus and V-focus. Before I start...

Re: Dell (sony) P991 trinitron troubles



This shows up regardless of what computer it's used on, and it's still visible after the cable is pulled loose, before it shuts down.



Not these monitors. They shielded the hell out of these things. Once you take the cover off, and you have to go through a layer of sheet steel surrounding the whole setup! There are, I believe, focus controls on the flyback, but I don't know what else, if anything. If I can't fix these by adjusting those, I'll probably just toss them in a dumpster...unless I can...

Re: Dell (sony) P991 trinitron troubles



Note that this is the same on /both/ monitors. In fact, I remember seeing one at work that was beginning to show the same symptoms!...

Picked two of these big suckers up at a garage sale on the cheap. Unfortunately, they both don't work the way they're supposed to.

Symptoms: the screen is washed out in blue, and you can see diagonal scanlines. When I run the 'color refresh' feature, the blue and diagonal lines go away, but only while that's running.

I don't know if the problem is tin whiskers in the gun, or bad caps, or what! On a side note, someone said something about 'special sony software' they use to configure the monitors. What's the deal with that?...

Re: Backlight problem on viewSonic VP171b



I've not taken it apart that far. I would think that it would only knock out half the lamps if they were bad, then again I have no idea how the inverter is programmed to react.

I don't know what kind of lamps or where to get new ones....

Re: Backlight problem on viewSonic VP171b

I replaced the two caps shown with Panasonic/ECG "FC" caps (Digikey # P11217-ND). Problem still remains. The screen works for a while, then dies until it cools off for ten minutes or so. I do hear a faint high pitch buzzing before it shuts the monitor off.

I don't know what else to do, other than replace the whole inverter, which I can't seem to find.

Edit: I found the proper model number on the bottom of the inverter;
PLCD2417414

Re: Backlight problem on viewSonic VP171b

I also have the VP171b, but my inverter is the "44.58402.002" model.

The caps are Hermei brand, 180 microfarad, 25 volt. I can not find a matching cap at the local stores, including Fry's.
I haven't looked online yet, but am about to. If I can just replace the caps, that's great.

If I can't find the same spec caps, can I substitute something else?...