Panasonic TX-P42GT20E 3D , does not turn on!

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

what your trying to say is that i have the right voltages on the main board right? I could measure but I'm not sure if i need to measure it with or without the D board connected?

[tw2005]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

what your trying to say is that i have the right voltages on the main board right?

well all that D board needs is the stdby5v for it to operate and switch on the panel. I'm saying that you have a lot of useful information in that guide. the slides show you stdby5v goes in there and gets converted to 3.3v, powers the panel cpu which turns panel main-on firing the panel up

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Thx for the help and explaining but I'm a bit confused right now. Forgive my ignorance but You say that the D board needs 5v to operate and switch on the panel. ( I see the 5v input and 3.3v output , i understand it also ). With the D board connected i get 5v on the P25 connector going to the D board but it does not power on.

Is this the conclusion that the D board is bad or is the problem still in the A board? Again i appreciate your help and i keep learning and learning.

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Im thinking your answer will be something like. Connect D board to the main board and turn on the TV. D board is getting 5v but does not turn on the tv.
Measure the voltages on the D board using the schematics?

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

I measured and the only voltage i get on the D board is 5V.

[tom66]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

If the D board does not work, no white pattern. It has to generate many control signals, very unlikely for that to work and other parts not work.

[Neelix]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

I though that maybe your STB5V was somehow being pulled down when the A and D boards was plugged in together, but it's not. From the repair guide that tw2005 posted:

The STB5V from the Power Supply is connected to the A and the D boards. During standby, this voltage is not used by the D board. In the A board, the STB5V is applied to a 3.3V regulator (IC5480) to generate the STB3.3V to power the MAIN MICON Genx8 (IC1100). The STB3.3V is also connected to the K board for remote control operation and to the power LED

The STB3.3V supplies the LED with power and IC1100 turns the LED on or off. The LED in your TV does not turn on. So measure the STB3.3V on your A board and if it's fine, then IC1100 is for some reason not working. It could have been toasted by the lightning strike

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Hi Tom , Neelix , thx for the replies!

I received the D board today so when i get home i'll insert it and see what it does. I will also measure the 3.3v on that IC. Maybe i can fix this A board with the other A board? If i dont have the 3.3v , what part then needs replacing? Im willing to sacrifice the other A board for parts.

I'll print some parts of the schematic and measure first! Any help is apprecitated!

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Guys i dont have IC5480?

Can it be that this model does not have that ic? Also checked the other mainboard..it does not have that ic?

Ps , new D board did not work , same issue! Hope someone can help me out. As i said im willing to use the other mainboard for parts

[tom66]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Maybe IC480, Panasonic prefix boards refdes with number, SC/SN for example is usually "1", "16" or "6", so Q16651 is actually Q651 (refer to D board print and part location table to be sure)

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

No i dont have that 1 either. I do have ic5481 ( 32pin ) and i can find ic1100.

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Nobody?

[Neelix]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

The number of the IC used in your model is different to the the number used in the repair guide. You must look for IC4582

[onurka]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Hello..
I'm new in forum.
I have a panasonic plasma problem PANASONIC TX-P50VT30E..
The problem is exactly 8 red blinking..
The problem is first 7 red led blinking after ı repaired sc borad.. After turn on power..
After problem now 8 red blinking.. I checked ss board and RCJ330N25 SHORT.. I ordered new ss board and waiting..

What can ı do?

help me please....

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Hi Neelix , i don't have that IC either! Where is it located on the main board?

[Neelix]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Sorry, made a typo. It's IC5482 on the foil side of the board

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Ok i do have that IC.

On the other board its a different ic so i can't replace it right now. You suggest i replace that component for the tv to work again?

[Neelix]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

I'm suggesting you measure the voltage at pin 8(STB3.3V) and pin 24(STB_RST) of IC5482 to see if they right

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Im measuring 0v with white screen and with D board connected.

[Moreno83]

Re: Panasonic TX-P42GT20E 3D , does not turn on!

Replaced Q5475 / Q5478 but still same issue. ( also no voltage ).