Panasonic TH-42PZ85E --> Completely dead!

[tom66]

Re: Panasonic TH-42PZ85E --> Completely dead!

OK, locate MC552

Check pins: 13 (STANDBY 5V IN), 12 (STANDBY 5V OUT), and 11 (STANDBY ON)

This device switches standby source on/off as necessary.

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

Will do that this afternoon.

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

Ps , I will download the service manual and see if i can figure it out myself. Its easy just to ask here but i want to learn.

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

Pin 11 is 4.85v
Pin 12 is 0v
Pin 13 is 5v

Thats good right?

[tom66]

Re: Panasonic TH-42PZ85E --> Completely dead!

I'll compare to mine later.... I think MC552 might be bad, but need to figure out if ON/OFF signal is inverted.

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

Voltages dont change when i use the power button!

[tom66]

Re: Panasonic TH-42PZ85E --> Completely dead!

That's not so good.

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

Already thought the same when you said inverted signal...

[tom66]

Re: Panasonic TH-42PZ85E --> Completely dead!

Ok, I'm picking up a TX-P42U30B tonight (2011 Panasonic plasma, 1080p ) so I might be busy, but I'll try and find time to do comparison tests.

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

Thx! Im gonna pick up a LG 42pj150 but please do compare!!

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

I checked the service manual and i understand the 552 board. Control board.
So the 552 board is bad right? It has to send 5v to pin9 on p25 cable.
Cant i jump that connection?

[tom66]

Re: Panasonic TH-42PZ85E --> Completely dead!

It seems more likely the main CPU is bad, you are welcome to try it, you might get a standby light but I expect it will error out immediately with 2/4/10 blink code if you power it on... worth a shot I guess...

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

Tom , i don't like that answer! :/ haha.

Well looking at the service manual the 5v go into the MC552 board but don't go out so something on the MC552 board must be bad ? ( Pin 12 is 0v ).
Pin 12 goes to Pin 9 on P25 cable which is going to the main board……
Gonna see if i got a similar main board somewhere.

[tom66]

Re: Panasonic TH-42PZ85E --> Completely dead!

I mean the CPU in the power board... By bad I should clarify - it is not switching that output on for a reason.... The question is why....

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

Didnt know the ps had a cpu?

[tom66]

Re: Panasonic TH-42PZ85E --> Completely dead!

It does...

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

So where is that cpu located? On one of the small prints? Makes most sense to me.
Did you find the time to measure?

If i just knew the values on those prints like the MC551 then i could just simply replace the parts….

[tom66]

Re: Panasonic TH-42PZ85E --> Completely dead!

Too busy tonight, landlord just cut through some ethernet cables, running around trying to get internet working again... Can check tomorrow.
It is located on one of the far end stand up boards.

[Moreno83]

Re: Panasonic TH-42PZ85E --> Completely dead!

No problem , already glad your helping! Your prob also wondering what the problem can be right?
GL with the ethernet cables.

[tom66]

Re: Panasonic TH-42PZ85E --> Completely dead!

Landlord put some carpet down on stairs, new stuff, went right through a buried ethernet cable, fixed now, I think.

Ok, found a moment... my results for MC552

Power button ON with TV working:
IN (13) - 5.06V
OUT (12) - 5.06V
ON/OFF (11) - 0.12V

Power button OFF with TV not working:
IN - 4.98V
OUT - 0.01V
ON/OFF - 4.88V

It seems ON/OFF is inverted logic, so it needs to be LOW for it to turn on.