Panasonic Quintrix F TC-21P50R help diagnosing the problem

[zeno]

First off thank you for the good prep you did. Some tell you almost nothing.
This looks challenging especially without lots of equipment.
1) if you have an old game or VCR try that through the RF.
2) if you have no inputs hooked up is the OSD stable ?
3) try tapping ( with authority ) the set & see if that effects it.
4) if the manual has a block diagram ( not the schematic ) post that.
It shows the flow from stage to stage & is a BIG help on high end sets.
5) DO NOT go into the service menus at this time !!!
6) when you pull the back take a chassis picture. That helps us remember
a set.

Let us know what you find.

73 Zeno
LFOD !