Hi,
Today I had the time and nerve to take a further look into this device.
At the end, I got it to work properly
, however I the fix is not permanent and I don't understand the fix at all.
I have a second unit and I connected a composite video cable to the EXTERNAL VIDEO INPUT of the second device. The purpose was to touch different points on device 1 (broken) to see if there was a video signal present.
By accident I touched the VIDEO OUTPUT of the TDA6880T and suddenly I got video. I touched the AUDIO OUTPUT of the TDA6880T and after a few times touching, I got sound as well.
The fix did not last very long - after running the device for 10 minutes it reverted back to the old state.
By touching the two pins with the video cable, I can get it back to work.
Also, if I touch the XTAL pin with my multimeter probe, I will get VIDEO as long as I keep touching it.
All of this does not work always, one has to keep trying.
The fix will survive a power off, removal of battery and power supply, but after like 30 minutes it is gone and the old state is back.
This proves that the TVLOOK board is not totally damaged and that all other boards are OK.
What I don't understand is what is wrong?
Can this be a strange damage of the TDA6880T?
Broken XTAL?
Any thoughts?
Attached is a picture of the relevant section of the board, the two black arrows show where I had to touch. The video cable had like +0.2mV on the tip - a different potenial as it comes from the other device's EXTERNAL VIDEO INPUT connector.
Thanks,
Vitor