Zak

link is down, can you upload it again? tnks!

Hi Bruce! do you have a disassembly of the "Coleco Final Test" that can be recompiled and work ? I was just asking Captain Cozmos how to disassemble that rom...

Hello, how do you do to disassemble? I would like to learn how to do it so that I can disassemble the code of the "Final Test" program. I'll explain: here in Argentina almost all the colecovision are cousins of the European PAL version, so the program does a BIOS checksum and when it doesn't find the NTSC BIOS, it throws an error. If I could get my hands on the ASM code I could modify it to correct that. Also, make a reduced version, that instead of checking video, audio and finally joysticks, it skips all that and checks BIOS ROM, RAM and jumps to joysticks directly. I understand that disassembled (and modified) code can be reassembled with z80asm, is this correct? From already thank you very much cc @newcoleco final test colecovision.rom

Could you share the PCB design so that I can print it here in Argentina? Thank you very much in advance for your contribution, it looks excellent work

great job, could you get the board files and schematic? tnks cc @Alesmukler

Hi! I offer this colecovision edition "Kenia Fueguina" from Argentina, it is standard PAL-N in its original box (see details in the photos). working fine. Colecovision 2 joysticks power supply (220v) price 400 usd I can ship worldwide via DHL greetings, -- Diego *facebook* https://www.facebook.com/DoctorColecovision *Instagram* https://www.instagram.com/doctorcoleco/

I was finally able to solve the problem, I leave the thread here for you to see in detail, the cause of the black and white image was U30. (CV PAL). https://forums.atariage.com/topic/339036-colecovision-pal-fix-no-colors/

"So U30 is my suspect. " YES YES YES, @ChildOfCvyou got it right! i replaced U30 with a spare IC and walahhh COLORS appeared. Then, when turning on the console, the logo appeared in black and white for a second and then came color. I corrected it in the modulator (pal modulator version) by removing the metal cover, it has two small potentiometers. Adjusting the highest one corrected that delay in the arrival of the color. A big thank you to everyone who responded by helping: @ChildOfCv and @marauder666 for their predisposition. #SOLVED

other time/div : and Q23 E : Q23 C : next I will try replace 1889...

Hello, thanks for the answer. In my case, I replaced the entire modulator and the problem continued, so I rule out that it is some fault in the modulator. Cheers

1889 pin 1 ->

Tnks @ChildOfCv update: I replaced Q20 and Q23 and nothing, still the same. Black&White (sometimes everything turns sepia). something that I did notice, comparing the states of U32 with a logic probe against a healthy coleco, pins 1 and 2 are different. healthy CV: U32:1 -> LO U32:2 -> HI B/W CV: U32:1 -> HI U32:2 -> LO other pins are the same. I'm thinking of replacing U32 first, and then U30's to see if that fixes the problem. how about? Thanks as always for the great help.

I get an oscilloscope today. I will be able to compare the values against a healthy CV. I will pay attention to Q20, Q23 and the U8 flip flop that divides the frequency of the crystal. tnks

hello Gaetznes, what happened in the end with your CV? were you able to find the component that was causing the color to fail? I am in the same problem. Cheers

Hello friends, I am repairing a Colecovision PAL version that gave a black screen. After an initial scan, I discovered that it was the BIOS that was dead. I replaced it and it revived, however no color. The tests I did to return the color, without success, were: check voltages, are OK. discarded TV and power supply, they work correctly with another colecovision. Replacement of the complete RF modulator. replacement of the two crystals. replacement of cap70 and cap1 VDP video chip reflow where can I continue? I attached a video of the error. Tnks! WhatsApp Video 2022-08-07 at 10.00.21 AM.mp4