April 19, 2024, 09:04:29 pm
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not auto detect15khz/25khz is done via the jumper plug you see in the last pic,all you do is de-power the monitor then take the plug from the 15k and put it to 25k.i very much doubt you will ever need 25khz unless you are running loads of sega boards circa 1994-1998yellow=vertical syncwhite=horizontal(composite sync)i am sure you can find the schem for this at www.pentranic.co.ukhow are you gonna run this via an arcade vga or soft 15khz,just a little word of warning-pentranic do not like to be over frequencied,it normally blows the horizontal output transistor
maybe get some advice from the 15k soft thread before getting an avga,perhaps you can make sure its nice and safenot my specialised subject i'm afraid so i can't be of more help
The board is made by Cheng Hong/ Rodotron. If you e-mail me I will send you a service manual that I made when I worked for another company that used this board.I use ChengHong extensively... in fact I am their representative in North America/yes for sure 15Khz or 24khz resolution manualy switchable.Rick@niemandisplays.com
o.k try linking the vertical sync to the horizontal sync