Hello,
Have worked on many of these early projection sets, however this one is acting up.
original problem was 15v standby diode,and replaced power supply cap with 4.7uf @ 100v in place of the 2.2@ 100v(cant remeber if this matters a whole lot.
Set fired up,and ran no problem. Checking tubes,noticed the red was dark,increased screen and got immediate retrace. Hmmm, changed out Q9206 video buffer.no effect!! swapped crt boards, problem followed, ruled out tube,. had a spare convergence board,swapped no change.
clue? stuck in parental lock.
hmm, thinking processor may be a bad boy,
Thanks in advance ,
Marv
Sorry guys,part # is Q 2906, not Q9206, also heard that c713 could cause this problem?
Set repaired!!!!
failed to mention set was previously worked on, ( clue for sure). Noticed an 8 pin socket ic holder for the EEPROM. hmmm.... yup someone installed the incorrect eeprom, hoping to solve the shutdown problem. Installed correct eeprom, all problems went away!!!
Again,many thanks to L.Dillon and his help with this site
Marv
Great news man! I was going to mention exactly what you did. I even have a service manual posted in the resources dept of this thread. You can go and download it if you like.
Thanks again ,Larry. You know, sometimes just posting a question will help you solve,if that makes any sense!!!!
Ha,
Marv
yes it does, I have solved many dogs that way. The hardest ones to fix are those that are tampered with or butchered.
Not a good place for this kind of post,
My apologies