Sega megadrive genesis video issue

Turned on my megadrive today after about 18 years And it's not working can hear sound and controls work but the graphics come up like this. I've pulled the motherboard and there isn't any corrosion or obvious dry solder.

http://i30.photobucket.com/albums/c...6-0507-4758-AB38-06167DD6F050_zpsvng5rfh7.jpg

http://s30.photobucket.com/user/chi...E-46C0-A7EA-4388042637F2_zpsdbkexhqz.mp4.html

Any suggestions?

 

Looks like IC or trace damage. The repair won't be easy.

 

Pictures of the motherboard? What power supply are you using? Where was it stored/

 

http://i30.photobucket.com/albums/c...3-ED3B-4604-AD62-46FE2366CFDF_zps3ctnji3p.jpg

http://i30.photobucket.com/albums/c...2-59EE-490B-86DE-CF30681C244E_zpsicsv3hvz.jpg

http://i30.photobucket.com/albums/c...F-074B-4C39-A738-13E3D32DC7DC_zpsgahnzdgt.jpg

http://i30.photobucket.com/albums/c...8-A078-4946-81BC-2B82DF18D78B_zpsthgdx74c.jpg

http://i30.photobucket.com/albums/c...7-FC67-4726-B91D-B3348861BC6F_zpsjzfkejyt.jpg

http://i30.photobucket.com/albums/c...7-FC67-4726-B91D-B3348861BC6F_zpsjzfkejyt.jpg

Pictures of the motherboard. Using the original power supply that came with the megadrive and it's been stored in 2 lofts which are dry and just below room temp

 

You need to recap the board completely, caps are dry. Ibought a Japanese VA3 that was EXACTLY like this, capacitors were the issue, if i left it on long enough and turned it off and on it would clean up the graphics, but not until i completely replaced all the caps did it fix the issue 100%.

 

Looks like something may have spilled where the metal heatsink is. this where the 7805 regulators are. Your model is a va5/6 which had two of them.
do you have a mulitmeter

 

Yes I do have a meter

 

I've replaced caps before but never done something this big

 

plug in and turn on the genesis. Measure the voltage on the OUT pin. on both regulators it should be around 5v. Black wire from the meter goes to GND. red one goes to OUT

 

Thanks I'll do it and get back to you

 

They both measured 4.96 exactly

 

they should be measuring more like 5.03, anything under 5 is usually not good. not saying that's the main problem though.

 

Could that be them on my power supply failing

 

yes this could be the problem, best way to check is get another adapter and retest voltage output.

 

4.96v should be good enough. it wouldnt cause the extreme glitching you see. From here I would agree that it needs a recap. While it looks intimidating, its more tedious.

 

Where would be best for me to get the caps from in the U.K.?

 

Talk To Bad_Ad84, he will be able to help with reliable sources in the UK.

 

Really appreciate your help guys. Just wanna bring it back to life as I have far more sentimental value than anything else

 

How long did you used to have to leave it on for the graphics to improve?

 

i would have to repeatedly shut it on and off and then leave it on for up to 1/2hr before the graphics would straighten out.