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barco 808s:contrast adjustment failure

 
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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sat Jan 15, 2022 6:57 am    Post subject: barco 808s:contrast adjustment failure Reply with quote


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I have an 808s projector. Turn it on and input the signal. The image presented is very dark and the contrast cannot be adjusted, but the brightness can be adjusted. I don't know what's wrong? thanks!
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Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 24167
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Sat Jan 15, 2022 4:01 pm    Post subject: Reply with quote

It's likely a problem in the RGB Switcher board or the quad decoder.
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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sun Jan 16, 2022 3:23 am    Post subject: Reply with quote

The quad decoder board should be bad.

Thanks! Curt
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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sat Jan 22, 2022 5:26 am    Post subject: Reply with quote

I replaced the quad decoder,the 808S can run properly, the contrast can be adjusted, but I found that the brightness of the red tube was abnormal when the machine was running, its brightness is relatively low, so, the image is color biased, I don't know what the problem is?Thanks!
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Hulio




Joined: 15 Apr 2006
Posts: 390
Location: Belgium


PostLink    Posted: Sat Jan 22, 2022 7:25 am    Post subject: Reply with quote

G2 voltage maybe ? Adjust G2 with a non-metal screwdriver according to page 40 on installation manual.
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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sat Jan 22, 2022 1:11 pm    Post subject: Reply with quote

I know the problem is not G2 voltage, I usually adjust the G2 voltage of red, green and blue to the standard value.
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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sat Jan 22, 2022 2:18 pm    Post subject: Reply with quote

In fact, I find that the brightness of the green tube is very bright, the brightness of the blue tube is slightly weak, and the brightness of the red tube is the lowest
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robin36mac




Joined: 24 Jan 2009
Posts: 39



PostLink    Posted: Sun Jan 23, 2022 11:15 am    Post subject: Reply with quote

If you are sure about the G2 voltage, you can check in Picture tuning/Color balance the gain and cut off for each tube

Robin
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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sun Jan 23, 2022 12:43 pm    Post subject: Reply with quote

I set the color balance to 6500,the color will be seriously biased, the brightness of the green tube is very bright, the brightness of the red tube is the lowest.I tried to adjust the Picture tuning/Color balance the gain and cut off for each tube ,but the color of the picture still was seriously biased
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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sun Jan 23, 2022 1:01 pm    Post subject: barco 808s:contrast adjustment failure Reply with quote

some pics[/img]


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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sun Jan 23, 2022 1:02 pm    Post subject: barco 808s:contrast adjustment failure Reply with quote

pics


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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sun Jan 23, 2022 1:03 pm    Post subject: barco 808s:contrast adjustment failure Reply with quote

pics


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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sun Jan 23, 2022 1:03 pm    Post subject: barco 808s:contrast adjustment failure Reply with quote

pics


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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sun Jan 23, 2022 1:04 pm    Post subject: barco 808s:contrast adjustment failure Reply with quote

pics


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Hulio




Joined: 15 Apr 2006
Posts: 390
Location: Belgium


PostLink    Posted: Sun Jan 23, 2022 1:48 pm    Post subject: Reply with quote

Ok, few things.
When you said that the G2 voltage was adjusted to standard value, how you've done that ? By measuring the voltage, by eye, or till the green G2 leds on the RGB amplifiers were out (while in the G2 adjustment menu) ?
Also, if you have a spare RGB driver board, try to swap it. And in case the contrast modulation, BCL-link and soft-edge boards are insalled, get rid of those too. They complicate things, and are useless for single projector configuration anyway.
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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sun Jan 23, 2022 1:58 pm    Post subject: barco 808s:contrast adjustment failure Reply with quote

I adjusted G2 as the standard value according to the instructions


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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sun Jan 23, 2022 2:06 pm    Post subject: Reply with quote

I have not the spare RGB driver board again,I've changed it once。 I also suspect that there is still a problem with the driver board.
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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Sun Jan 23, 2022 2:09 pm    Post subject: Reply with quote

I didn't install additional the contrast modulation, BCL-link and soft-edge boards 。
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bluemoonhu




Joined: 16 Feb 2021
Posts: 47



PostLink    Posted: Tue Jan 25, 2022 7:05 am    Post subject: Reply with quote

The driver board has problems!I swaped it with a good driver board.
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