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Re: Successful Overclock 60Hz -> 180Hz of Laptop LCD!

Posted: 16 Apr 2018, 23:24
by Curi0
How did you unlock the pixel clock since AMD pixel clock patcher doesn't work on my laptop.I can do 106hz with no artifacts after cleaning the video cable contacts with isopropyl alcohol (previously it would glitch when too much action is on the screen). If I try anything with a pixel clock higher than 162mhz the resolution doesn't appear

Re: Successful Overclock 60Hz -> 180Hz of Laptop LCD!

Posted: 18 Apr 2018, 14:32
by Chief Blur Buster
Curi0 wrote:How did you unlock the pixel clock since AMD pixel clock patcher doesn't work on my laptop.I can do 106hz with no artifacts after cleaning the video cable contacts with isopropyl alcohol (previously it would glitch when too much action is on the screen). If I try anything with a pixel clock higher than 162mhz the resolution doesn't appear
What resolution is your panel? Did you also try a lower resolution?

Re: Successful Overclock 60Hz -> 180Hz of Laptop LCD!

Posted: 07 Nov 2018, 11:32
by evilhf
Hi, I wonder if there is an overclock on benq xl2420z monitor.
It comes locked in the factory, the maximum I can and 145hz.
If it rises more it shows (out of range).
Is there any way to change the monitor firmware?
Edit EDID ?
Has anyone tried?

Re: Successful Overclock 60Hz -> 180Hz of Laptop LCD!

Posted: 07 Nov 2018, 15:11
by Chief Blur Buster
Even if we can reprogram the firmware, the highest it can go will probably be not much higher, due to cable bandwidth limitations.

That said, lower resolutions at higher Hz may work, though with a lot of effort (costing more than the cost of a new monitor) it may be able to overclock to approximately 180.

Ironically -- it is much easier to overclock a "dumb" (few smart electronics, single port) 60Hz laptop LCD to 180Hz, than it is to overclock modern tech-filled 144Hz monitors (e.g. strobe backlight, VRR, multiport DisplayPort+HDMI+DP etc) to 180Hz. The overclockable Korean monitors of yesteryear often had only a single port. Fewer weak links for an overclock to fail.

Panels often aren't the weak link in overclocking (though quality do degrade, but more analog-ly) -- it's the electronics. The scaler/TCON, drivers, etc.

Re: Successful Overclock 60Hz -> 180Hz of Laptop LCD!

Posted: 08 Nov 2018, 18:19
by evilhf
Thanks for laying your time Chief Blur Buster.
I already have an advanced knowledge in electronics.
I even opened my xl2420z, removed the eeprom spi-flash MX25L1606E, saved the original firmware that was V2 with a CH341A recorder, in case you have a problem.
Then I recorded the V4 firmware on the monitor and everything worked perfectly.
If I could get 180hz I would be very happy.
I searched for the datasheet of MST8556T and found nowhere.
In fact it does not seem to be a limitation of the scaler chip or cable, I believe it is a lock via firmware itself.
But in the programming part I have little knowledge.
I do not know where to start, if in fact I have to modify the main memory MX25L1606E, or just the EDID that is recorded in another eeprom 24x ...
So little is the program that edits the data.
Does anyone have a light ??