Panasonic , TX-PF42C20 4 red blink

[TaRaSS2007]

Hello my tv , on power show green led blink faster then 4x red led blink , 2s pause , 4x red etc etc

When i disconnect p2, have allways 4 blink.
When i disconnect p11, have 7 blinks.

On p11 , when i push the power button have 15v 1/2 second
I haven't voltage on P2, is my p board hs or another card ?

I need help for repairs this tv please with procedure to test that

Sorry for my bad english i'm french user

[TaRaSS2007]

Re: Panasonic , TX-PF42C20 4 red blink

i have found that if someone can help me

[tw2005]

Re: Panasonic , TX-PF42C20 4 red blink

SO going by the manuals you've posted and the symtoms this is a HD model with a SN and SS board that link together. Common fault is the SS board shorts, the 4 x RJP30E? transistors short. That shorts VSUS and triggers 4 blinks which is why when you disconnect p2 4 blink remains as p11 is being shorted.

Unfortunately sometimes the SB can be damaged when the SS fails.

[TaRaSS2007]

Re: Panasonic , TX-PF42C20 4 red blink

but ss is power by p11 right?
why i haven't volt on p2 ?

[tw2005]

Re: Panasonic , TX-PF42C20 4 red blink

but ss is power by p11 right?
why i haven't volt on p2 ?

Both P2 and P11 are Vsus and are fed from the same line on the power board.

So if one side is shorted e.g. P11 you're not going to see any Vsus there or P2 and a shorted Vsus in the 2010 model in most cases will trigger 4 blinks.

As for the 15V, I suggest you study the manual and schematics. How many wires do you see on P2, two. How many at P11, three.

P11 has 15v, gnd and Vsus which on a good day is around 200V.

You see 15V for half a second as the P board comes up but it sees a dead short on Vsus and TV shuts down, bye bye 15V.

You see nothing on P2 because it only has Vsus and since this is shorted on the SS then there will be 0volts.

I bet if you disconnected P11 you will see 200V on P2 momentarily but if you try this disconnect both power cables from the SS one of which goes back to the SN. Then you will have to leave the TV stand for a while until that voltage drop s off or you have arcing when reconnect.

Personally, I think you should disconnect the SS and check if the Vsus to gnd is shorted or just look for those 4 transistors I mentioned and check if they are short.

I expect they will be.

[TaRaSS2007]

Re: Panasonic , TX-PF42C20 4 red blink

i will see that , thanks.

[tw2005]

Re: Panasonic , TX-PF42C20 4 red blink

cool, good luck with it

[TaRaSS2007]

Re: Panasonic , TX-PF42C20 4 red blink

exactly when i disconnect P11 i see 200v on p2 momentarily and 200v too on p11 pin

[TaRaSS2007]

Re: Panasonic , TX-PF42C20 4 red blink

Is there an equivalence for this transistor ?

[tvtimmy]

Re: Panasonic , TX-PF42C20 4 red blink

IRG7S313UTRLPBF or
FGD4536 will work. Test them before you install to make sure they are not FAKE parts!

[TaRaSS2007]

Re: Panasonic , TX-PF42C20 4 red blink

fake parts ?
and how i can be sure transistor is dead ? is dead if continus with multimeter in transistor and metal right?

[tvtimmy]

Re: Panasonic , TX-PF42C20 4 red blink

Youtube has videos on how to check transistors and IBGT's. Do some homework please.

[vinceroger69]

Re: Panasonic , TX-PF42C20 4 red blink

http://www.mouser.co.uk/ProductDetai...3d1TJ0E6mC5w==