This year, KP EXR something Sony with the PS under the HV board. You know the one, they continued the chassis line in the XBR line a bit longer. I believe they are 2SC4582s, and they both checked good on the ohmmeter. Of course a bipolar transistor is a three layer device, and did check good as such. It just did not amplify.
A couple years ago I had a Hitachi or Toshiba HDTV that had never had anything plugged into the "colorstream". The symptom was that there was no red on component inputs. It was a bitch to troubleshoot even with the print. I traced it to a regular bipolar transistor that also checked just fine as a three layer device yet did not transist. In fact, I didn't lift the base because it was an SMD and I erroneously changed the IC that fed it !
These are times when a meter just won't work, you need to see the difference between the B and E waveforms, look at that and the load and know what the collector waveform should be. But even that wouldn't find this.
So how many have run across this "It does not transist" ?.
JURB