Did I destroy my panel/cause problem with my overclock?

[pp-pp-man]

Hi, this is my first post here after months of just reading and scrolling :) Hopefully this is the right corner to post this.

I have an old BenQ 2720Z with newer firmware (above V2). I am saving up for something with 165 or 240Hz at the moment but wanted to try to overclock my monitor. I created a custom resolution with CRU and the 165Hz overclock works fine, and I can feel the difference playing counterstrike.

Two problems:

1. How can I "calculate" or find the settings for Front Porch, Sync Width, Back porch, Blanking and/or Total? Also, polarity?

2. I am not sure if this problem came with the overclock, but it is here to stay as far as I can tell. For some days now, I can see small white lines on my monitor (left to right) which fill 85% of the screen and then stop. After this line, the lines disappear and the panel also has more contrast in the area.

I tried taking a photo of it, but it is rather hard with a phone. You can't really see the lines. The strong black bar on the top is just the Photoshop window. I am talking about the change in gray below.



Maybe someone can help me out or clear things up for me. A lot of stuff here is too technical for me.

Thanks a lot!

[Chief Blur Buster]

1. How can I "calculate" or find the settings for Front Porch, Sync Width, Back porch, Blanking and/or Total? Also, polarity?

You can't always calculate for overclocks. You just have to become familiar with what the stuff means, as a virtual resolution beyond visible resolution. Sync's were used to reset a CRT beam, and porches were used as overscan. These vestigal paddings in digital signals still remain today, wasting bandwidth, but this gives you a slush fund that you can transfer to active image (e.g. reduced porches/sync).



It's luck of the draw -- sometimes monitors glitch when the porches are too big or too small, other times, it allows you to overclock higher because the Pixel Clock (number of pixels/sec) can support more Hz (refresh cycles per second) if you reduce the bandwidth wasted in large porches/sync. To overclock more within a bandwidth budget.

Other times you're playing with monitors' sensitivities, so you're doing lots of experimenting. Sometimes overclocks work better with a goldilocks porch & sync.

See CRU Glossary

[pp-pp-man]

Thank you for the clarification! I guess I need to better understand what I am doing. Will check out the glossary. Appreciate it!

Even though I reset everything, the faint line stays. Could this also be a problem from changing settings?