JoMa

I cleaned the pot with isopropyl alcohol, never really used deoxit since alcohol does the job for me every time with switches/pots/etc. I'll keep it in mind for sure though. For now, I'm leaving it as-is since it works. But good to know for future repairs. Thanks for the help!

The chip is compatible, as it is from a PAL 7800. I've managed to fix it by now though, was about to report back on it here. Turns out there is a very very small sweet spot for the potentiometer where the color output will work correctly. Both with the original TIA and the 7800 TIA. I must have been turning the pot a bit too quickly. Makes me feel kinda stupid now, but the window where the color will work really is tiny, had to turn the pot very slowly to find it. I've never experienced this with the color pot on any other Atari system.

Tried this, the TIA from the 7800 does result in a working AV signal but only in monochrome, color switch and pot don't make a difference

I was starting to fear that could be the issue. I have a completely dead 7800 board around somewhere that I might be able to 'borrow' the TIA chip from.

Hi all, I'd appreciate any advice or help with this. Recently I got a PAL light sixer which was listed as untested. Upon testing the console, everything seemed to work except that I could notice the colors were wrong. I'm no stranger to repairs so I tried many things, none of which made a difference. I'm sure this is a PAL console, I'm sure these are PAL games and I'm using a known good power supply. I'm kinda out of ideas at this point. Here's what I tried: -adjusting the color pot (barely makes a difference, turning it past a certain point just results in a black and white image) -cleaned all switches, the potentiometer, the power jack and the chip sockets -reseated all socketed chips -Replaced all electrolytic caps, the film cap near the voltage regulator, and the film cap near the color pot -Replaced the voltage regulator -Reflowed all solder points on the switches, power jack, chip sockets, color pot and ribbon cable connector -Installed a (temporary) composite mod, which outputs pretty much the exact same image as RF None of this made things worse but none fixed the issue either. The only possible thing I can still think of are the film caps under the cartridge port being the issue, but I've never seen anyone mention those related to video issues. I've attached a few images to show the issue. Some colors seem to be somewhat correct while others are totally wrong. The smurf being green probably being the perfect example.

Hi Vectrex fans, I got a Vectrex I was asked to repair and I'm currently investigating the issue it has. It seems to permanently get a left joystick input. The ship in minestorm always keeps spinning counterclockwise, even when the controller is disconnected. The action buttons on the controller work fine but moving the joystick does nothing at all. I can confirm the issue is not with the controller as I have a known-good controller to test with from my own Vectrex. I shot a short video showing the issue: https://photos.app.goo.gl/xdVaCcbBGYaxQXZ58 After looking this up, I found a video suggesting that IC302 is the issue and should be replaced. IC302 is not socketed on this unit however, so I wanted to ask the people here first for a second opinion on this being the issue before I go through the whole process of desoldering the chip. Scrolling through the comments, people seem to be mixed on whether this is the correct fix. I already tried reflowing the pins of IC302, as well as the controller port, so I can rule out that being an issue I'd love to hear some thoughts on this, any help is appreciated!

Yup, received the console and the problem ended up just being the power switch. Replaced it and now I got myself a fully working unit. ^^

Hello everyone. I recently bought a broken Phillips videopac G7400. It does not come with any cartridges. The seller said it simply does not switch on. I am completely new to this console, but do have some experience repairing other consoles from this era. How would I go about troubleshooting this unit without any cartridges? One question I could not find an anwser to is what happens when you turn the system on without any game inserted? Does it output any video signal? It would also be good to know some of the common issues with this console. What should be the first thing to check? Any help is appreciated.

Thanks man! Found that guide already, i'm probably going to buy this kit: https://www.benl.ebay.be/itm/Atari-2600-7800-NEW-AV-Composite-Mod-Kit-Audio/152509029274?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 It has a guide as well, so I'll see. If I get my atari fixed, I will of course post it here!

No, I'm not using a switch box. The PAL consoles have a coax plug that comes out of the system that you plug directly into the tv. I will probably try a composite mod!

I just replaced All the green chicklet caps and the big capacitor, and guess what? Nothing! [emoji58], i'm getting a bit tired of this console. Whats next to try? Replace the voltage regulator? Replace the small cap above the RF unit? Or perhaps do a composite mod? I dont know anymore... Edit: Could it still be the cheap power supply I use, its one of those with interchangeable plugs. Perhaps it's the issue. Also, just noticed, when i touch the connector on the board while the system is running, the distortion gets worse. So my guess is still that the RF mod is the issue at this point.

I will try and get to an electronics component store and see if they have what I need. Will tell you how it went. As for the wire: Upon further inspection, it was soldered to the screw holding down the voltage regulator. I took a risk and removed it, the Atari still worked perfectly after that, so I guess someone put that wire there years ago trying to fix an issue. I'm just going to keep it removed as it doesnt make a difference anyways, or does it?

Just got my replacement cable and it makes the distortion even worse somehow! So i'm keeping the original cable. So what to do next? replace the chicklet cap i guess... Any info on what voltage it is? Thanks for the help so far everyone!

I just noticed something! Is this wire even supposed to be there on the underside of the board? It connects the voltage regulator with the negative side of the big cilinder capacitor. The soldering work seems very unproffessional too. Should i remove it and see what it does? Verstuurd vanaf mijn G3121 met Tapatalk

The new rf Cable and some fresh solder arrives today, so if the cable doesnt help nothing, I will have to break out the soldering iron Thanks for the tip! Verstuurd vanaf mijn G3121 met Tapatalk