Electronics > Repair
Troubleshoot No Video - Magnavox Odyssey 2
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Wil_Bloodworth:

--- Quote from: wasedadoc on November 29, 2023, 12:35:27 am ---1.  So the TV does indeed have the software for analogue RF reception.  How exactly were you connecting the console output to the round F-type connector on the TV?

--- End quote ---

I'm using a normal RCA cable with an RCA-to-Coax connector/adapter on the TV end.


--- Quote from: wasedadoc on November 29, 2023, 12:35:27 am ---2.  That is not the place I told you to probe!

--- End quote ---

My apologies... it's been a long day and I'm tired.  I will try again with less dyslexia in a few minutes.

- Wil
Wil_Bloodworth:
Ok... IC1... pin 5.

Wil_Bloodworth:
Maybe I should check pin 4 of IC6 too?

wasedadoc:
Nothing wrong with that.  Probe the other end of R7 which connects to W2 on the modulator unit.  Audio is going into the modulator at W3.  Clearly at least part of the modulator is working or you would not have got the sound operational as you reported in the first post.

Signal at pin 4 of IC6 will be about 60 MHz.

It is after 1 am here so no more from me now.
Wil_Bloodworth:
I was able to trace (electronically), the video pin backwards from the RF Modulator box to Pin 27 of IC5.  There does not seem to be any meaningful signal coming from that pin.

When I (try to) read the schematic, it looks like IC1 is passing all of the video data to IC5 but the audio is being sent directly from IC1-Pin 5 over to IC6.  We tested and confirmed we are getting signal out of IC1-Pin 5 and we know that is audio because... I'm getting audio but no video.

I traced the video signal from IC5 Pin 27 to the RF Modulator (IC6 Pin 6).  I could not find an details on this 612178-1 chip so I don't know what happens to the video signal when it gets there... but I do not think that is important right now because there does not appear to be any video signal coming from IC5 pin 27.

Amy I approaching this correctly?  If no video signal is coming from pin 27 of IC5, what should I try next?  Should I try to pull that IC and clean the pins / socket and try again?

Oh, and I know that pin 27 of IC5 is making contact with the board because there is continuity from the board traces directly to IC5 pin 27... so cleaning the socket is probably not going to solve anything.



- Wil
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