Panasonic tc-p42s30.. confused?? how to test transistors in circuit

[Six-Cap]

I have the above mentioned TV. Has the 6 blinking LED lights. I've read many threads in this forum with similar issues (press power button, clicks, then led starts to blink, no picture or sound, no glow, no response to remote) and it points to some bad components on the SN board. I've done some unplugging tests, and volt readings to support this theory for my TV also. I'm not very knowledgeable on how to test the transisistors. Mainly, what they're pinouts are, what readings I should get in diode or ohm mode. From watching vids on YouTube, correct me if I'm wrong, if I get two different reading from a common pin when testing the other 2 pins; that common pin is the base. And the pin with the higher reading of the two is the emitter. Which leaves the last pin being the collector. But I've also read and and seen the terms "gate source drain" used. does gate =base, source=emmitter, and drain=collector? Or are they just completely different? If I have a bad transistor, it won't give me those 2 readings I need to determined configuration. I feel like I'm going in circles.. And the letters/markings around these particular transistors(Q401,402,421,422); E,C,G; confuse me even more. Do they represent emmitter, collector, gate? ..I've pulled the board off the tv( the ribbons to the panel made me a lil paranoid about how much force needed to twist and bend them, so it took a lil while). That's where I'm at in this process. Here's a pic of what I'm working with. I'm new to this, so please bare with me..any help would greatly be appreciated.

[Six-Cap]

Re: Panasonic tc-p42s30.. confused?? how to test transistors in circuit

And my humble tools..

[Six-Cap]

Re: Panasonic tc-p42s30.. confused?? how to test transistors in circuit

Here it is..

[tw2005]

Re: Panasonic tc-p42s30.. confused?? how to test transistors in circuit

Humble it is.

Those 4 transistors are IGBT insulated gate bipolar transistors, what does that mean....who cares. they usually failed shorted

keeping this simple, leave it where it is in diode and just probe all combinations of 2 legs and see if showing short ( o.oo or very low)

the transistors you mention I'd start there but I expect this will be a moduslinkpts rebuild job for the SN

i would expect bad SN on this TV. there's other threads about including a very recent one in the UK for this series. You'll get plenty of info doing a search and having more of a read

[Six-Cap]

Re: Panasonic tc-p42s30.. confused?? how to test transistors in circuit

Tw, thanks for giving me direction where to continue. It's late here, and I will resume with probing and the results tomorrow. ��

[tw2005]

Re: Panasonic tc-p42s30.. confused?? how to test transistors in circuit

Tw, thanks for giving me direction where to continue. It's late here, and I will resume with probing and the results tomorrow. ��

For sure or go to page 2 and read the UK model TX-P42S30B

very common fault