you`re right. Sorry once again.
Then where is the problem? If you use working ttl cable (checked? i mean if connect tx and rx of cable do you get echo of symbols you input?), then it should work with 4,11,5 pins connected.
Note that rx of cable should be connected to tx of tv.
Is your cable ok?
You should know, cable lenght is important - better dont use any additional cables. Use your USB ttl cable and connect it to TV`s VGA port, avoid long distances.
Use Laptop or take TV closer to PC.
And finally, i think you should swap tx and rx.
TV`s rx(pin4) - cable`s tx
TV`s tx(pin11) - cable`s rx .
GND is ok.
Don`t be scared to experiment with pins. Also we don`t know if cable helps - if you havent set rs232 do debug, cable is useless.
Do you have 3.3v or 5v or both?
The max chip could be in your prolific. Check if cable settin is ttl 3.3v maybe jumper if it has both
With a non ttl connection it will not work.
I can't check your taken photos, I'm on smartphone right now. Just at evening maybe...
Check forum for similar eu models and try procedure as described. I think eeprom must be same as yours...