Pansasonic P50S30 Solid Red LED - Repost

[Audioplus]

Powers up I guess, red led stays solid red, unit doesn't do anything, have to unplug to power down.

[tw2005]

Re: Pansasonic P50S30 Solid Red LED - Repost

I would have just kept this all together as it's in progress. Locked solid may very well be shorted Vsus / SC board. Check Sc2 for short cct or disconnect Sc2 / Sc20 and try turn on again and see if it attempts to start up then sos blinks.

[tw2005]

Re: Pansasonic P50S30 Solid Red LED - Repost

This is out of the ST30 guide, but quick summary of SOS changes for the 2011 models

Shutdown but No Blink code - Power LED stays on (Check for Shorted Vsus* / Vda** / P15V

Blink chart:
NO BLINLK SOLID RED,
LSI Error,
Shorted Vsus Shorted Vda Shorted P15V

In order of probability.

SC - SS, P, A, Panel

Red Solid LED (No Blink): LSI error. This condition is triggered when the power supply SOS-detect-signal is triggered during the startup process.

[Audioplus]

Re: Pansasonic P50S30 Solid Red LED - Repost

Thanks TW, what I get from the service manual is probability of a bad power supply, do you concur?

[Alastair E]

Re: Pansasonic P50S30 Solid Red LED - Repost

More likely SC or SS board has a short on the Vsus line......

[Audioplus]

Re: Pansasonic P50S30 Solid Red LED - Repost

I disconnect the SC2/P2, SC20/A20, SS11/P11 as instructed and I get 8 flashes. I reconnect everything and disconnect the SC2/P2 and get 7 flashes, if I disconnect the SS11/P11 I get a solid red LED
That's supposed to be telling me something, SC Board ?

[Alastair E]

Re: Pansasonic P50S30 Solid Red LED - Repost

Have you checked the Vs line on both the SS and SC boards to deck for a short...?

[Audioplus]

Re: Pansasonic P50S30 Solid Red LED - Repost

Actually, when disconnecting the 3 cables as described, I get 8 flashes, indicating an A-Board or Vsus - P15 short. When I disconnect the individual cables, I get the 7 Blink on the SC, solid on the SS
Thus indicating an A-Board fault?

[tom66]

Re: Pansasonic P50S30 Solid Red LED - Repost

8 blinks should be SS, you sure it's A board?

[Alastair E]

Re: Pansasonic P50S30 Solid Red LED - Repost

Well--IF you're randomly unplugging stuff, and not confirming whether there's any SHORTS anywhere with a Multi-meter.......

All you are gonna do is confuse the matter looking for errors that dont exist--as you're making errors by disconnecting stuff!!

[Audioplus]

Re: Pansasonic P50S30 Solid Red LED - Repost

I'm off to get my multi meter in my work van . . . .
I was just responding to the service manual Page 61 for Solid Red Failure indicating that after the 3 cables are disconnected, it is blinking 8 times. A-Board, Vsus or P15V correct?

[tw2005]

Re: Pansasonic P50S30 Solid Red LED - Repost

The fact you go from solid led (locked mode) or SOS4 on start-up to 8 or whatever after you disconnect the Sc confirms you have Shorted SC board.

In the 2010 models, a dead short on Vsus produced SOS4 at start-up but with these they've changed that to what you are seeing now

Initially you said it was constantly restarting and I did suggest checking SC for short because that appears to be the most common fault with the 2011 range.

Now that you have revised that with locked solid LED, I think everyone here is on the same page and expected shorted Vsus somewhere.

8 blinks is correct for Sc20 removed, it's all in the guide. Either way when you start probing it's going to be on the panel boards and not A or PSu that's my gut feeling on this.

[tw2005]

Re: Pansasonic P50S30 Solid Red LED - Repost

The flow chart may not be 100% since it's for ST30, if it turns out to be A I'll eat my words, meter is the best way to be sure of what's what.

[Audioplus]

Re: Pansasonic P50S30 Solid Red LED - Repost

P11 on power board, Brown Pin 4 initial resistance reading is 20V, Pin 1 is around 1V or less

[tw2005]

Re: Pansasonic P50S30 Solid Red LED - Repost

P11 on power board, Brown Pin 4 initial resistance reading is 20V, Pin 1 is around 1V or less

Got me confused, what's the meter on? resistance of 1 volt and 20Volts?

[tw2005]

Re: Pansasonic P50S30 Solid Red LED - Repost

I gotta get ready for that other 4 letter word, work , there's plenty of help available from everyone.

[Audioplus]

Re: Pansasonic P50S30 Solid Red LED - Repost

No short on Pin 1 of P2 and Chassis, There is a short on Pin 1 of SC Board & Chassis, there is no short on Pin 1 of SS Board and Chassis.
Indicates a bad SC Board?

[Audioplus]

Re: Pansasonic P50S30 Solid Red LED - Repost

Yes the meter's decimal point is fluctuating back and forth, the short is extremely low reading

[Audioplus]

Re: Pansasonic P50S30 Solid Red LED - Repost

TW, Alastair & Tom
As usual, thanks for your help Gentlemen!

[Audioplus]

Re: Pansasonic P50S30 Solid Red LED - Repost

A local associate has commented that he thinks there could still be an upper buffer issue?