Panasonic TH-46PZ85U Power Issue

[drpj23]

I have a Panasonic plasma that has the error code of 2-blinks.
I have downloaded the service manual and troubleshooting guide.

It is a 15v SOS issue.
There are three causes for this; Missing 15v, a short, or wrong diagnosis by D-board.
I have tested for a short at pin 1 at P7 and I have 1.6 kohms. (it does drain though)
Then there is 15v present (at all locations) before the relay clicks off.
I have replaced both the D and P board (except P(AC)).

I am still having the 2-blink issue.
I am suspecting another bad D-Board maybe?

Any suggestions?

Also, if it may be relevant, if you hold the power button down while it is doing the 2-blink error code it turns to 10 blinks.

[DavidOH]

Re: Panasonic TH-46PZ85U Power Issue

If you go to this AVSForum thread you'll find lots of info.

http://www.avsforum.com/avs-vb/showt...ighlight=mc301

Start about 4 post from the bottom of page 33. Sounds like you may a power control module MC301, MC201 cap problem. Hope this helps.

[drpj23]

Re: Panasonic TH-46PZ85U Power Issue

Thanks for the link, and ya there is a lot of information.

I see in the forum where it could be that module issue with the cap but I have already replace the entire board, you wouldn't think it would have that issue would you?

I guess I could always check to be safe but I'm leaning towards an A board.

[DavidOH]

Re: Panasonic TH-46PZ85U Power Issue

I'd try and do the 2 blink checks.

http://www.scribd.com/doc/46124232/T...GPH11DU-Chasis

This is the one I used for a 42pz80u and a 50pz80u. The 42 was the A board.
The 50 I replaced the cap on the MC301. You could try the cap fix on the old board. The caps are only about $2 each at Radio Shack.

[drpj23]

Re: Panasonic TH-46PZ85U Power Issue

Well, I bought the same model with a cracked screen for $50 and replaced all the power boards, A board, and D board and...........7 blinks lol.....well at least it was something new lol so I replaced the Y sustain and IT WORKS.

2 blinks can be the SC board but their troubleshooting guide kinda threw me for a loop.

But it works

[dietzcj]

Re: Panasonic TH-46PZ85U Power Issue

drpj23,
Do you still have the A board ? What is the suffix and would you be willing to part with it ?

[bluto]

Re: Panasonic TH-46PZ85U Power Issue

Sounds like you may a power control module MC301, MC201 cap problem. Hope this helps.

I have a TH-46PZ80U and I am considering preemptively changing the little 1uf smd caps on the MC301 and MC201 boards. Is is best to use lytics or non-polarized ceramic?

This guy used lytics: http://www.youtube.com/watch?v=LjpGKaBt8hg

[drpj23]

Re: Panasonic TH-46PZ85U Power Issue

Umm It may be in a box somewhere or I don't have it. I'll let you know if I find it.
And bluto, if that lytic worked then I would do that.

[RON_CET]

Re: Panasonic TH-46PZ85U Power Issue

1. Reseating the connector P25 may solve the problem. If it does not.
2.Right before the unit shuts down, check the VSUS voltage at connector P2 of the power supply. If VSUS voltage measures zero volt, disconnect the connector P2 and SS11. Check the VSUS level at socket P2. If it is still low, replace the P board.
3. Unplug the unit and disconnect the connectors A5, A6, and A7. Apply power to the TV. If a White screen comes up and all voltages check normal, replace the P board.
4. If the TV stays on after isolating the SC board, then replace the SC board and the D board; it is likely that the fuse on the D board is blown

I see replacing the Y-Sustain fixed it late night didn't read down enough Congrats on saving your set

[drpj23]

Re: Panasonic TH-46PZ85U Power Issue

Ok, new problem has arisen with the tv.

It cuts on an plays for about 15 mins then shuts off and resets back on (with relay clicks)

Then plays for another 5 mins possibly then resets again (shuts off then back on)

Then in smaller intervals until finally it the relay just clicks until you unplug it.

I have not taken the back off yet, but am letting sit and going to see if a reset does anything (doubt it will but eliminate solutions).

Anyone have ideas? BTW there are no blinking codes upon shutdown - it just shuts off.
I'll prob get it apart in about 30 min.

[drpj23]

Re: Panasonic TH-46PZ85U Power Issue

Probably heat related - due to the fact that the power supply has the FETs and other heat sink components underneath it. Something gets too hot and voltage drops cutting the power supply off but it has got to be something that doesn't trip the error detection.

[ben7]

Re: Panasonic TH-46PZ85U Power Issue

Checked for bad solder joints?

[drpj23]

Re: Panasonic TH-46PZ85U Power Issue

No i did not...But, with the back off and a fan right on the P/S it runs all night.

I actually may have a couple of the P/S's in stock and when I switch it out, I'll check for bad solder joints then.

[dietzcj]

Re: Panasonic TH-46PZ85U Power Issue

DRPj23, Did check for that A board ?

[drpj23]

Re: Panasonic TH-46PZ85U Power Issue

I have not found it yet.....but it may be buried so let me get back to you

[Toasty]

Re: Panasonic TH-46PZ85U Power Issue

Not just solder joints. Check the plugs/connectors and board interconnects too. Was the problem in another thread. Turned out to be the problem in a buried board.

T

[drpj23]

Re: Panasonic TH-46PZ85U Power Issue

Sorry dietzcj, I could not find it.

[drpj23]

Re: Panasonic TH-46PZ85U Power Issue

Well, tried replacing the power board (had 2 on stock) but they both were duds -_-
Well with the original back in it has been running for about an hour with no fan (back off though) so could have been something Toasty was alluding to.

[sdinelli]

Re: Panasonic TH-46PZ85U Power Issue

hello, i attempted the mc201 replacement and there a little resistor next to it thats gone missing.
can any one help me with the value of this so i can replace it?

https://www.youtube.com/watch?v=LjpGKaBt8hg
in this video half way thru you can see the resistor on the left.
he even warns you to watch out for it lol
thanks

[diif]

Re: Panasonic TH-46PZ85U Power Issue

This one ?
I have a board here from a 42" and it seems the values are different depending if its the MC301 or MC201.
MC201 is 101 (100ohms) MC301 is 201 (1kohm)