panasonic tx-p42gt30b

[Jahson]

Re: panasonic tx-p42gt30b

sorry tw2005 if what I was saying isn't clear, could I piggy back the resistor over the connection with original still in place, Connection 1 & 2 just add the 5w or 7w 15ohm resistor on top.

[tw2005]

Re: panasonic tx-p42gt30b

sorry tw2005 if what I was saying isn't clear, could I piggy back the resistor over the connection with original still in place, Connection 1 & 2 just add the 5w or 7w 15ohm resistor on top.

Yeah , I guess, don't know why though. I'd stick to 5W otherwise more energy is going to pass through the 7W before it blows. It may be ok but you're dealing with the mains side of the PSU, exceeding the original design may be risky.

[Jahson]

Re: panasonic tx-p42gt30b

I may of confused you sorry, its not the fuse sided that's blown, its not reading the resistance 15ohms

[tw2005]

Re: panasonic tx-p42gt30b

keep in mind clearances, this board looks like it's designed to be low profile.

[tw2005]

Re: panasonic tx-p42gt30b

I may of confused you sorry, its not the fuse sided that's blown, its not reading the resistance 15ohms

No I think I confused everything early on, I don't think there is a fuse as such but the whole resistor is the fuse. And it has done it's job because it is now open cct and no longer reading 15ohms.

We'll just think of pins 1 & 3 as the same. (on the resistor)

[Jahson]

Re: panasonic tx-p42gt30b

Ive removed them from the board, to test.

hope this helps.

[tw2005]

Re: panasonic tx-p42gt30b

Ive removed them from the board, to test.

hope this helps.

makes it clear,I understood your point, I've explained it best I can.

[Jahson]

Re: panasonic tx-p42gt30b

So I could order 5w 15ohms try what I said then, should be able to make it fit. can just swap them around.

[tw2005]

Re: panasonic tx-p42gt30b

I'd pull the bad one out, get a 5W 15ohm ceramic, fit the leads where 2 & 3 are.

[Jahson]

Re: panasonic tx-p42gt30b

Isn't 1-3 the fuse & 1 - 2 the resistor ?

[Jahson]

Re: panasonic tx-p42gt30b

Replaced the 5w 15ohm resistor as said, also fuse, plugged in mains.
Heard bang fuse blown, checked the 5w 15ohm resistor open circuit again.

[tom66]

Re: panasonic tx-p42gt30b

You should consider building a series lightbulb tester to prevent popping fuses and new components. You probably have a shorted FET or bridge on the board somewhere, failing that, a bad controller IC stuck ON would cause this.

[Jahson]

Re: panasonic tx-p42gt30b

Cheers tom66, yea I give it ago in the morrows, think tw2005 was saying the same as a short somewhere. will double check those under the heatsinks.

[Jahson]

Re: PANASONIC TX-P42GT30B

Hiya after few more checks, does these readings sound right.

D100 <near to where that 5w 15 ohm resistor that was blown under the heatshield
- +
1-2=1.441
1-3=1.441
1-4=1.102
2-3=1.765
3-4=1.440

+ -
1-2=0.494
1-3=0.492
1-4=0.473
2-3=1.763
3-4=0.493


D700 <near to the 2 transformers under the heatshield
- +
1-2=0.450
1-3=0.451
1-4=0.888
2-3=0.000
3-4=0.451

+ -
1-2=OL
1-3=OL
1-4=OL
2-3=0.000
3-4=OL

Also notice C603 should be 820uf but its reading 726.3uf (ESR Meter Used)

These 2 diodes? D204 & D216 both reading OL, near the single transformer.

They read T3D 0D

[tom66]

Re: panasonic tx-p42gt30b

How did you get pins 1 to 4 on one two pin diode?

[Jahson]

Re: panasonic tx-p42gt30b

thats not related to those diodes

[Jahson]

Re: panasonic tx-p42gt30b

post #31 I replace the fuse (f102) & piggy back a 5w 15 ohms resistor on too R100,
did more probing.

Main pictures in post #15

[tom66]

Re: panasonic tx-p42gt30b

Sorry, not paying attention here.

[Jahson]

Re: panasonic tx-p42gt30b

Any suggestions

[Jahson]

Re: panasonic tx-p42gt30b

Any other suggestions