Izen Posted March 6, 2019 Share Posted March 6, 2019 Hello all, I know there have been topics posted about this before and I've been trying to go through them and figure out what my issue can possibly be. My old Expansion Module 1 gives a black screen. The Colecovision works fine and I've tested the Expansion with a known, working 2600 game(s). I've opened up the Module and it's clean, but what should I be looking for (capacitors, chips?). Thanks for any help and insight! Quote Link to comment Share on other sites More sharing options...
towmater Posted March 6, 2019 Share Posted March 6, 2019 Perhaps check the composite video signal inside the EM1 before it is passed through the CV? Quote Link to comment Share on other sites More sharing options...
Izen Posted March 18, 2019 Author Share Posted March 18, 2019 Could this resistor be the culprit? If so, can anyone let me know what I need to purchase? Thanks! Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted March 18, 2019 Share Posted March 18, 2019 The resistor is fried. So is the diode below it. You'll have to remove the diode and roll it to read off the entirety of the part number. The resistor... well, someone who still has a working board should be able to tell what it once was. If you can find a similar set of diodes and resistors on the other player input, it will probably follow that pattern. But still, to fry a resistor like that requires some next-level abuse. Makes me wonder what else that's less obvious might have gone with it. 1 Quote Link to comment Share on other sites More sharing options...
Izen Posted March 18, 2019 Author Share Posted March 18, 2019 (edited) Crazy. It was my dad's and he's never really been into gaming, so it never got much use. I took it for obvious reasons, so I hope I can figure which resistor and diode I need. If anyone can tell me, I would be very grateful. I'm attaching a picture of the full board. Edited March 18, 2019 by Izen Quote Link to comment Share on other sites More sharing options...
Izen Posted March 18, 2019 Author Share Posted March 18, 2019 (edited) These look like the resistors I think, but I'll need to check the diode. https://www.ebay.com/itm/Resistors-carbon-film-1-4-watt-5-axial-leaded-18-Ohm-QTY-of-20/163550705845?hash=item261461b8b5:g:iuwAAOSw~OVW1I-e Can anyone confirm that this resistor is 18 ohm, 5% tolerance? I found this picture of it, but it's a little hard to tell. Edited March 18, 2019 by Izen Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted March 18, 2019 Share Posted March 18, 2019 This reminds me: I really need to get one of those and reverse-engineer the schematic for my collection. Quote Link to comment Share on other sites More sharing options...
Izen Posted March 24, 2019 Author Share Posted March 24, 2019 Hey guys, so I put the two new diodes and the resistor in. I'm getting a black screen. Could one of the chips be bad? Quote Link to comment Share on other sites More sharing options...
Djoulz Posted May 16, 2019 Share Posted May 16, 2019 Hi, I've same issue and don't know how to check the chips ... So i'll be also glad to have some hints ... Quote Link to comment Share on other sites More sharing options...
the_crayon_king Posted May 16, 2019 Share Posted May 16, 2019 (edited) There are quite a few missing traces !? On second thought that has to be marker right ? Anyway Your resistor value seems to be correct going by the other picture and I'm assuming you didn't put the diode in backwards. Id follow the trace that is common to that resistor and diode. Follow it further down and see where its going. I may dig mine out and look Edited May 16, 2019 by the_crayon_king Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted May 16, 2019 Share Posted May 16, 2019 Hi, I've same issue and don't know how to check the chips ... So i'll be also glad to have some hints ... The chip near the controller plugs is the RIOT and the chip across the board from it is the 6507. The one above it is the TIA-equivalent chip, which works in pretty much the same way as the standard TIA but with pinout differences. The main clock comes from the Colecovision. EM1's schematic is nearly identical to the Atari 2600. You can do a lot of the standard Atari 2600 troubleshooting with that knowledge. Just check the console5 page for the E4002 pinout. Quote Link to comment Share on other sites More sharing options...
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