I found a used (and untested) Proxima A822C. When put on the overhead the picture has too much blue colors. When i look from the top on the panel it's nearly completely blue. When i look at the panel in a 45 degrees angle it would be ok.
I lifted the panel to a 45 degrees angle and then all colors were ok (of course i could not see very much cause the light of the ohp was not completely covering the panel.
The starting screen is working and the menu to adjust colors, contrast and so on too.
It seems that the light coming out of the ohp should be broken to a 45 degrees angle before reaching the panel.
Any ideas???
I lifted the panel to a 45 degrees angle and then all colors were ok (of course i could not see very much cause the light of the ohp was not completely covering the panel.
The starting screen is working and the menu to adjust colors, contrast and so on too.
It seems that the light coming out of the ohp should be broken to a 45 degrees angle before reaching the panel.
Any ideas???
Humm sounds wierd I have a proxima panel 822c and it dosent do that did you check the colors that they are not over to the blue side? maybe crack it open mabe the lcd cable came a lil loose and moving it around will fix it thats the bad thing about untested panels.......they can be duds, I have had 1 dud so far it was a sharp2500 but I only spent like 10 bucks on it locally so it wasnt so bad
I tried to fix it by playing with the graphic card options (asus agp 7700 deluxe). I can modify the colors seperately for red, green and blue. But only red and green are working.
If i try to change contrast, brightness or whatever for the blue part - nothing happens.
It seems that the panel always shows full value of blue.
I opened the panel and saw some broken condensators (burnt by a short curcuit?). I rechecked my power supply but all voltages were okay.
If i try to change contrast, brightness or whatever for the blue part - nothing happens.
It seems that the panel always shows full value of blue.
I opened the panel and saw some broken condensators (burnt by a short curcuit?). I rechecked my power supply but all voltages were okay.
Is the splash screen really blue, if not you might have a bad vga cable that has the blue wire shorted or open.
Does anyone know where i can find a curcuit diagram or a datasheet for the A822C?
I asked the support team at proxima and they said that the panel is out of date and there is no support. (I think they don't want to give the wiring diagram away.)
I tested some voltages at the controller board and found out that the opamp for the blue color shows 5V at the output. Other two amps give about 1.30 V each. This is the reason why the panel always shows blue color at full level.
There are some testing points on the controller board but as i don't know what they mean it's not possible to say where the curcuit is broken.
I asked the support team at proxima and they said that the panel is out of date and there is no support. (I think they don't want to give the wiring diagram away.)
I tested some voltages at the controller board and found out that the opamp for the blue color shows 5V at the output. Other two amps give about 1.30 V each. This is the reason why the panel always shows blue color at full level.
There are some testing points on the controller board but as i don't know what they mean it's not possible to say where the curcuit is broken.
This posting is for all owners of a Proxima A822C. Maybe you can help me.
I opened the case and looked at the controller board. There are some testing pins labeled from TP1 to TP13. These are pins where you should have a certain voltage. So if anyone can take the voltages at these referencing pins i can compare to those of my panel.
Please take the attached image and show it in full screen mode. Measure the voltages at TP1 to TP13 and post it here. This could help me to locate the place or integrated curcuits that are not working.
Thx
I opened the case and looked at the controller board. There are some testing pins labeled from TP1 to TP13. These are pins where you should have a certain voltage. So if anyone can take the voltages at these referencing pins i can compare to those of my panel.
Please take the attached image and show it in full screen mode. Measure the voltages at TP1 to TP13 and post it here. This could help me to locate the place or integrated curcuits that are not working.
Thx
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