Why LCD screen will turn black 1s with some old cards under dos

Discussion about old graphics cards, monitors and video related things.

Why LCD screen will turn black 1s with some old cards under dos

Postby tonychen » 2018-1-20 @ 13:02

MOBO: 845(socket 478), J3160MP(modern CPU, 1151)
OS: DOS 7.1

The video cards are: FX5500, MX440, Gefore210(modern PCI-E cards, without power supply, Intel HMA 3000 within 1151)

From the beginning of powering up my PC to DOS Menu, the LCD screen will TURN BLACK IN ONE MINUTES AND COMES BACK TO NORMAL, with use of the these cards: FX5500, MX440, Intel HMA 3000(on J3160MP).

But, when I use G210, it works perfect!! The LCD screen will not turn black, will not on any game, apps.
IMO, is this related to the high rate of G210 to be matched with LCD rate??
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Re: Why LCD screen will turn black 1s with some old cards under dos

Postby tonychen » 2018-1-24 @ 10:07

Today, I remove the AGP card and replace with a PCI 4MB S3 Virge Card. This issue still occurs. Maybe I figure out the reason:

1. Video card DAC is too slow to catch up with the LCD large screen?
2. LCD does not support high refresh rate(above 60), while the video card does not support the low refresh rate(60)?


:depressed:
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Re: Why LCD screen will turn black 1s with some old cards under dos

Postby kixs » 2018-1-24 @ 11:31

This usually happens when changing video mode. Screen and video card needs some time to sync.
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