Model 2c crx : Opinion on what happened and how to fix - FIXED

[Mrhide]

Dynamite cop.
I am thinking somebody inverted the rgb connector

I have replaced the connector on the filter board ( nice to have that part in stock!) and have removed the female part from a dead hikaru board ( never throw stuff out! ). I will change that blue cap? As well

Now looking at that female connector part, i am trying to understand

If i should change it
Did it take something else out
What happened

I see this :

And that line you see has no connectivity but what? An arc appeared and fried the connector?!

Opinions please?!

Thanks!

 

[stj]

the blue thing is not a cap, it's a filter - it could have shorted.
the centre pin is ground, the signal goes into and out of the ends
you need to remove the filter and check it - if you want to get rid of it, just link the outer pads and dont touch the center one

 

[biggestsonicfan]

This is nutso! I've never seen anything like this before!

 

[stj]

i have - twice.
on naomi filter boards - never did discover what caused it!!
maybe a monitor fault

 

[Mrhide]

I have replaced the emi filter with one from an old daytona filterboard… value 222 instead of 221 should be pretty close right?

Have stiched the burned trace, which hey, might not be the most beautiful fix but it should work.

Reaaaly tempted to try it now without changing the other part!

 

[Mrhide]

i have - twice.
on naomi filter boards - never did discover what caused it!!
maybe a monitor fault

vga cable without pin9 removed?

 

[twistedsymphony]

vga cable without pin9 removed?

that would be my first guess.

 

[stj]

wouldnt know, i got them that way - but they came from industry so should have been in cabs with sega looms.

about the filter - 221 = 220pF, 222 = 2200pF / 2.2nF

 

[stj]

worked it out

the filter cap went short circuit - if you look at the trace you see that pin is a voltage on the connector, the filter grounded it.
thats why the trace on the input side of the filter is not damaged.

 

[Mrhide]

Hey guess what? no smoke and she works!