panasonic blinking light chart

[cb007cb]

Why is it that most of the time the chart gives incorrect results on
the blinking light codes from Panasonic?

[tw2005]

Re: panasonic blinking light chart

What do you mean? There's only so many checkpoints it can monitor. I always use them as a start point to begin fault finding and to prove whether that is the cause or something else.

Shorted SC boards can cause for example a number of codes to trigger.

[tw2005]

Re: panasonic blinking light chart

Here's an example, bad SC in a 2010 FHD series can cause, 2,3,4,5,6,7,10.

[cb007cb]

Re: panasonic blinking light chart

You just confirmed my question 6 or more codes for 1 problem!!!!!

[tom66]

Re: panasonic blinking light chart

The blinking code tells you WHAT the problem is... for example, 4 blinks, POWER SOS, 10 blinks SUB POWER SOS.

It does NOT tell you what caused that blink code necessarily. SC boards can cause a number of possible blink codes. 4 blinks is PSU overvolt, caused by a Vsus-15V low impedance connection; 10 blinks is a 15V or other rail going down somewhere, 6,7,8 are standard SC/SS trouble codes, etc.

Use the blink code to figure out what is causing the set to shut off, then use that information to trace the fault.

[tw2005]

Re: panasonic blinking light chart

You just confirmed my question 6 or more codes for 1 problem!!!!!

yes. Using the SC as the example 5,15 and Vsus is supplied to that.

Shorted Vsus will short the PSU. Trips SOS4 which is sensed by the PSU Micom. So in this instance you check the PSU voltages, you find Vsus missing, next step is to isolate anything connected to the Vsus line, you find it comes up clearing the PSU, you know either SS or SC had to be shorting this, you then check those.

To take this one a little further here's another scenario. Something on the buffer board fails, normally 7 blink, then blows the SC (6 or 7 blink) which in the process of failure causes a short on Vsus (4 blink).

You could argue SOS4 is a buffer board fail.

to go a little further, it will only blink one code so depends at what point something is triggered as well. You can get false detections. Not uncommon to see someone report a 10 blink then change to 4 and I suspect that may depend if the TV was running when it shutdown or if powered back on after the original fault or even further damage on the repower.

i go back to the to the buffer board scenario because i've actually done this and it was my fault but replacing a shorted Sc without checking the buffers. On the first power cycle it gave me 7 blink (buffers). isolated the buffers and jumpered the SC, all good.
thinking it was a connection issue and reseating everything, power on and bang, dead SC back to 4 blink (original fault) had I woken up a little in hindsight it was stupid not to check the buffers at the first 7 blink.

And another real scenario, 4 blink shorted SS, easy, replace the SS, now 1 blink? How does the SM cover that one?

Obviously they occurred simultaneously. The panel won't power on with either of those so in this case my best guess would be the SS shorted shutting the TV down and somehow the data on the SPI flash got corrupted or it was spiked. I did confirm that flash ic triggered the 1 blink.

i was pissed off when I cleared the 4 blink repairing the SS to find I had a dud A. If i knew that was coming , i would have bailed out on that one in hind sight but i did learn something. SM did not help me with that one and neither would any manual for that matter. Just the way that one turned out and a rarity I would suspect.

I believe the intent of the SM is to point you to the monitoring checkpoints and not to list every conceivable scenario some of which they may not even be aware of at the time of printing the SM.

that's where those training guides can be really great because from what I've seen are compiled later with additional data and real field results of what resolved the blink code.

I get what you mean and it would be nice if the SM had every answer but then that's when fault diagnosis comes in. They are intended for the technicians to use in which case a degree of assumed knowledge and ability is applied.

You may have already had a close look at a block diagram but I've highlighted the SOS blocks I can see.

Hope somehow this helps in some way.

[Dax Corrin]

Re: panasonic blinking light chart

How quickly or slowly would this blink sequence occur? It seems my TV blinks over and over, how long is the pause between sequences? Maybe what I am seeing is 1 blink code over and over.

[tom66]

Re: panasonic blinking light chart

The pause is a couple of seconds between each blink. Yes one blink every few seconds would be a 1 blink code.