Difference between revisions of "PCB Repair Logs Rygar Bootleg"
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'''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/5802-RYGAR-%28bootleg%29 Rygar (Bootleg) PCB Repair]<br> | '''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/5802-RYGAR-%28bootleg%29 Rygar (Bootleg) PCB Repair]<br> | ||
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I had just received this in a box of PCB from another member so it was luck I guess (or fate??) | |||
Anyway the PCB is not JAMMA so had to make a harness, powered it up and immediatly noticed one half of the screen had static garbage on the crosshatch screen but not the initail screen with tecmo on it and also in game half of the images were not displayed or were in the wrong spot (for sprites). | Anyway the PCB is not JAMMA so had to make a harness, powered it up and immediatly noticed one half of the screen had static garbage on the crosshatch screen but not the initail screen with tecmo on it and also in game half of the images were not displayed or were in the wrong spot (for sprites). | ||
Revision as of 07:54, 15 August 2012
Rygar (Bootleg)
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| PCB Image | Reserved |
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| Pin Out | Reserved |
Repairer: GameDude
Forum Thread: Rygar (Bootleg) PCB Repair
I had just received this in a box of PCB from another member so it was luck I guess (or fate??)
Anyway the PCB is not JAMMA so had to make a harness, powered it up and immediatly noticed one half of the screen had static garbage on the crosshatch screen but not the initail screen with tecmo on it and also in game half of the images were not displayed or were in the wrong spot (for sprites).
Hmmm thinking cap on.... OK its probably ram and on this board there are two layers the bottom being the video board so I went straight there.
A small note at this stage I should make is that upon inspection I did notice some blackened tracks indicating corrosion under some tracks from some form of liquid spilled on the video PCB side.
Anyway noted 2 x 6116 large ram on either side of the single row of ROMs a huge bank of 4064's (screen buffer??) and 1 x 2016 (probably sprite ram).
I figured out that the 2 x 6116 were responsible for loading the screen data and seeing as there were two and half the screen was muck and the other half was OK it seemed like a good place to start.
Checking with a probe showed everything was pulsing OK so decided to check the tracks where I had noted corrison before.... I dont fancy removing good ram for a lousy broken track and sure enough that was what it was.
Probing through about 20 odd traces revieled that one had a hairline crack.
I decided to make good all the tracks in one go so removed the PCB coating to reveal copper track, repair the trace that was broken and reseal with PCB laquer.
STATUS : FIXED
