Highly probable you actually have a fault in the tele rather than someone
dicking with the service menue. Suspect some of the passive components
around the vertical output, the output itself, etc. post the operational
potentials of the ic when in operation.
"Bert" lijbertv_at_xsinet_dot_co_dot_za wrote in message
...
Hello all
Problem with above Samsung, the bottom third of the screen is not there.
Replaced the vertical output IC TDA8356, still the same.
The drive signals coming from the TDA8842,pin 46 and 47, only one is
there,
the other one is just a dc level.
It is possible that someone was in the service menu and did change the
vertical settings.
Will try to get the original remote, which I do not have.
Anyone know how to come in the service menu and which options to change.
Thank you very much for any reply
Bert.



Thanks for the reply Art.
Pin 1 of the TDA8356 has got a nice sawtooth.
Pin 2 of the TDA8356 has a dc level of about 4 volt.
The dc lines are clean and the right value according to the datasheet.
The 2 outputs are there, but the positive and negative outputs do have a
flat part when showing on the scope
Did download the datasheet of the TDA8842, the same I do measure on pins 46
and 47.
I do not know if it is possible to adjust the linearity and shift so far
that one of the outputs is only a dc level.
Only problem is the 8842 is quite expensive but it seems I do have to get
one.
Greetings
Bert.