Panasonic TX-37X10B, 14 blink/SOS-14

[Alastair E]

A dead set with 14 blinks--SOS-14. (Edit, Model is- TX-P37X10B)

On power-up, LED flashes green a few times, panel initialises then off and then 14 red-blinks.

The Manual for the 42X10B suggests 14 blink code is 'PWM Audio' but gives no further info, what or where.

TP2008, The Audio-chip monitoring is high (correct for operating) but goes low when the set shuts down. TP2008 is actually for SOS12 but cant find any test-points for SOS14 on the diagrams....
--Disconnecting speakers etc makes no difference, and there's supply 15V to the audio chip, --both halves, during set start-up prior to red-blink.

I dunno, Every set I pick up lately is a weirdo!

Any ideas?

[Alastair E]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

Well--Ive been through the schematics and block-diagrams, Every SOS line is listed and plotted from its source to the micro/s.

All EXCEPT SOS 14.

So--I dunno even quite Where to look for this fault excepting that cryptic comment in the manual, PWM Audio, or how its monitored for SOS.....

Another Panasonic needing yet Another Mainboard. That makes Three I now have.

I don't think I'll bother with this make anymore--Too much trouble, and later ones are just too CRAP to repair anyway.

[tom66]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

SOS14 is just a general main board fault - Emergency SOS I thought?
Can on the newer sets be simply caused by a shorted SC/SS so I presume you've eliminated them as obvious causes?
(Can also be Vsus abort from PSU, Vda short, 3.3V loss I think.)

[Alastair E]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

Some research on the web has dug up these two posts on a German Forum, but the writer doesn't say exactly What he did to get some results Guess something is lost in translation too---

----------------------

I still have some further measured to also write here no nonsense.

The TX-P37 has no SOS14 loud Manual. The larger Viera TX-such as P50 have a code 14 error and it means "Audio PWM Error".
That is correct, but inaccurate.
The audio amplifier chip is powered by the image processing chip with a pulse width modulated signal. If the image processing chip is faulty, the Main CPU signals an SOS14.

I have the short-circuit is not eliminated, but only in isolation. I could make the most of the functions of the image processing chips again, but not all.
... I'm still working ...

Unsolder the defective chip, and especially the new solder then again, is not easy and risky even for a skilled acrobats soldering iron. The chip would cost about $ 15.
I would avoid this operation and rather lose some areas of the image chips (A ADV7471 in my Viera)
-----------------
Can I tell you exactly is a chip are bonded onto the cooling fins. Therefore jez can not read as it is called, but it is a ADV7470 or 7471 or so, all the same ...
It is chip 4510th
One can with some feeling Turn off the defective pins, then the error is gone 14 and the TV starts again.

But you will lose functions either the sound or the HDMI input or AV inputs.
DVBT, and menu Reading SD card or USB are 7470 still work with fully destroyed ADV.

It is possible to unsolder the chip and replace it, but I'm still not in Germany ADV 7470 found. Should you order in Taiwan ...

PWM is misleading. The ADV7470 sends a pulse width modulated signal to the sound amplifier chip. NEM Short he no longer makes the stop. But mainly falls from the image.

Have no Kolophoniumkünstler, buy Dir'n new A-Board.

[tom66]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

So my guess is the ADV74xx is the main video/audio processor IC. When it fails (HDMI surge will do this) it will trigger a fault code of audio error.

If you can override the PWM signals (perhaps they're stuck high or low) then maybe it'll hide this error code.

[Alastair E]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

Aye--Tom, I would love to--But, The schematics around/of/concerning IC4510 make NO sense to me whatsoever!

I cant even decide what pin does what! Page 49 of the manual illustrates (I Think) the IC 4510, But all that is, are columns of reference numbers not hinting what they do or where they go! Most seem to be either DGND or AGND....

Following this schematic for me is near impossible--Whats the secret??

[tom66]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

To be honest it's not much easier for myself. I have a small background in making somewhat complicated microcontroller circuits, but nothing anywhere near the complexity of such a design. Most of the time I'm guessing. I'll check things like RESET lines; if there's a datasheet I'll see if the voltages seem normal.

If there's data on it, I'll check the core supply rails (some of these chips have additional on-board voltage regulators for the other small rails), again referring to the datasheet.

For I2C (SDA and SCL/SCK lines) I have a reasonable idea of what to expect (square wave pulse on SCL, falling edge on SDA followed by data clocked on each rising edge) - but it helps to have an o'scope which can trigger on I2C and decode it on the fly (my Rigol can even show if the Slave device responds to the Master's processor requests - it's a single bit-toggled at the end of each byte - but it's hard to capture that on a CRO.)

[Alastair E]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

Ah--Thanks Tom, That does make me feel a LOT better....

Guess I should be grateful that a schematic--Of ANY type is available for the mainboard--even if I cant understand it!

[ReeceyBurger123]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

Alastair did you ever sort this issue, I have a TNPH-0784 with the same issue diagnosed it to be the same Ic as you stated did you ever get around to replacing it or did you just buy a new board ? I fixed one of these about a 6 months ago I just replaced the A board but want to fix the other one I have. Cheers.

[ReeceyBurger123]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

Well I don't believe it but I fixed my tv ! The failure is the Bga solder on that Ic I reflowed the Ic and the tv is now alive will post a youtube video

[ReeceyBurger123]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

This Ic gets very very hot now that the tv is working seems abnormal to me but it could have been the reason why it failed due to heat as that Ic does do alot, will let you know if anything occurs.

[tom66]

Re: Panasonic TX-37X10B, 14 blink/SOS-14

Consider heatsinking it. Panasonic has had a few BGA failure issues (often with the Plasma AI processor, causing SOS6/7 and random display glitches.)