Text only | Text with Images

PCEngine-FX.com

NEC PC Engine/TurboGrafx-16 Games/Consoles => Console Repair/Mod Center => Topic started by: Ergot_Cholera on 01/19/2016, 04:03 PM

Title: Core Grafx bad composite output
Post by: Ergot_Cholera on 01/19/2016, 04:03 PM
http://youtu.be/hRiCM6JLRnk
This is what I get from the din socket and also via my AV Booster.
 I have tested it with a Tennokoe 2 that I have RGB modded that uses pure sync and I get a perfect image.
Title: Re: Core Grafx bad composite output
Post by: thesteve on 01/19/2016, 05:11 PM
no luma
possible modded unit (svid)
Title: Re: Core Grafx bad composite output
Post by: Ergot_Cholera on 01/19/2016, 05:23 PM
It isn't modified. What is the cause of the lack of luma signal?
Title: Re: Core Grafx bad composite output
Post by: thesteve on 01/19/2016, 11:39 PM
well it should be coming off pin40 of the 6260 into a resistor ladder where it mixes with the other parts of the video sig
Title: Re: Core Grafx bad composite output
Post by: Ergot_Cholera on 01/20/2016, 05:06 AM
I already tried to trace it from the C6260, but I got lost through all the resistors and (transistors?). I will try tracing it from the other end. Nothing looks obviously damaged (but then it probably never does).
If I can't find an obvious solution that is simple enough for my lack of knowledge to comprehend then I will just use pure sync with an RGB mod.
Text only | Text with Images