Sega Genesis: Help me diagnose a NO VIDEO ISSUE? Caps/re soldering Help...

I am currently trying to fix a Sega Genesis model 1. Powers up fine, resets etc but won't show video.
all I get is a black screen or a light buzzing sound. Currently I can only connect via the RF box, so once my din connector has arrived I can make up an AES cable for it. I may well test it later with the paper clip method.

I disassembled the unit, it was filthy. Worst I've ever seen. Rusty RF box, Lots of orange corrosive leakage on the PCB, especially on the underside of the RF unit and the Power.

I can see caps possibly damaged or completely missing solder on some, but I'm not seeing any bulged or exploded ones necessarily. I have cleaned out the pin connector, removing a lot of hair!

Looking at these images, can you tell me what I need to replace, caps and re solder wise, and offer any advice as to what is causing the video loss? I'm probably going to order a capacity kit, initially. Thanks

- just seen a leg that's come away from solder (bottom left pic, 2nd set) on the corroded area C2. So that's one thing to do.

- made up a video lead to check din connection... No video there either

 

It's not a no video issue if you're not getting sound, either!

Why do you think it's caps? And what's that fluff all over the legs?

Revert to basic fault-finding principles. Check voltages - input and on chips first.

 

haha it was to show you the state of the place before I finished cleaning it

I get my meter tomorrow hopefully so I will do so then. But if it powers on, it's the graphics chip or something in that area at fault, right?

The pics show the caps and the brown leakage, what's that from? - one suggested step would be to change them, as recommended by a few people on forums, not saying its gonna fix it, or that they even need doing, this is why I am uploading the pics for you guys to offer your opinion on them, and the general state of the board.

 

Just got a heck of a lot of hair and fluff from the base of the pin connector but still a blank screen

 

Blank screen can be caused by many things, most of the times its simply bad contacts in cart connector. What technique did you use to clean it?
Also what AC adapter are you using ? Otherwise Retro is right, check the basics.

Edit: I am not sure as to what you refer as the brown leakage. But maybe you are talking about the flux residues. Which is normal.

 

Hi I use a small amount of Brasso on the game contacts (wiping down, til dry only) - for consoles I have an official pin connector cleaning with alcohol solution... A few drops only, up n down never side to side etc etc I'm pretty confident it's all clean and that my techniques have not damaged any pins. I've repaired two SNES already.

When you say 'many things,, what else is possibly to blame? Still waiting on my damn multimeter to start troubleshooting. So some more info regarding these would be great.

Most of my other boards don't have the brown sticky (corrosive also, a guy said) stuff around the underside of PCB, under power and RF units- just wanted to ask the experts whether it needed to come off and whether it was a leaky cap (as I've never had any caps that need replacing, I'm having to learn as I go)
thanks

oh I'm using a generic multi adapter (good ones off eBay... They work well nes snes or genesis.