Panasonic TX-P37X20B

[snipersquad100]

I got a Panasonic TX-P37X20B with no power and 13 red LED flashes. A google serch says it's a emergency sos on the "A" board which is the main av board. Is there a text I can do to prove this? I disconnected the y and x boards but same problem remains. The power board isn't giving any secrets as to voltages to check.

[tw2005]

Re: Panasonic TX-P37X20B

I got a Panasonic TX-P37X20B with no power and 13 red LED flashes. A google serch says it's a emergency sos on the "A" board which is the main av board. Is there a text I can do to prove this? I disconnected the y and x boards but same problem remains. The power board isn't giving any secrets as to voltages to check.

Sounds like A board. P42C2E, same A board and PSU SOS 13

That A board looks worked on? that white connector with no plug in center top, is that badly corroded / shorting?

[snipersquad100]

Re: Panasonic TX-P37X20B

Its a pretty new set, very clean inside. the connector is not corroded see pic.
I got some blinking information (pardon the pun) on the led flashes codes in case someone needs it in the future.



=================================================================================
BLINKS PROBLEM CHECK POINT
=================================================================================

1 blink Panel Info SOS * No Info Given *
LP1 Start SOS

3 blinks P+ 3.3v SOS A-Board

4 blinks Power SOS P Main-Board / P Sub-Board
P-Board / P2-Board

5 blinks P+ 5v SOS A-Board

6 blinks Driver SOS 1 SC-Board / A-SC FPC
SC Energy Recovery Circuit
A-SC FPC DET

7 blinks Driver SOS 2 SU-Board / SD-Board
SU/SD Connector DET
SU/SD Scan and Logic IC

8 blinks Driver SOS 3 SS-Board / SS2-Board / SS FPC / SS2 FPC
SS FPC Detect
SS Energy Recovery Circuit

9 blinks Discharge Control SOS A-Board

10 blinks Sub 5V SOS / Sub 3.3v SOS A-Board / SC-Board / SS-Board / P Main-Board / P Sub-Board
Tuner Power SOS

11 blinks Fan SOS A-Board / Fan

12 blinks Sound SOS A-Board / Speaker / Woofer

13 blinks Emergency SOS A-Board

14 blinks IR LED SOS A-Board



BOARDS DESCRIPTION:

P MAIN Board = Power Supply (VT30 Models) - Non-serviceable. Must be replaced for service.
P SUB Board = Power Supply (VT30 Models) - Non-serviceable. Must be replaced for service.

P Board = Power Supply (All Other Models)
P2 Board = Power Supply (All Other Models)
A Board = Main AV Input / Processing
K Board = Remote Receiver / Power LED / C.A.T.S. Sensor
S Board = Power Switch
V Board = 3D Eyewear Transmitter
C1 Board = Data Driver (Lower Right)
C2 Board = Data Driver (Lower Center)
C3 Board = Data Driver (Lower Left)
SC Board = Scan Drive
SS Board = Sustain Drive
SS2 Board = Sustain Out (Lower)
SU Board = Scan Out (Upper) - Non serviceable. Must be replaced for service.
SD Board = Scan Out (Lower) - Non serviceable. Must be replaced for service.

[tw2005]

Re: Panasonic TX-P37X20B

The 42 will be close enough for the PSU and A board

[snipersquad100]

Re: Panasonic TX-P37X20B

Thank you

[tw2005]

Re: Panasonic TX-P37X20B

Those blink codes are from what manual? I'd expect the SOS the same for the 42 and the 37 since they both have the same TNPH0829 A board the difference should be just the data loaded on the eeproms/flash ics.

Don't see 13 blink, stops at 12 but probably does not mean it can't generate a 13 blink, just not mentioned. that post I linked has the same A and he reported 13, new A board fixed it.

Yeah, second shot much clearer of that connector, looked funny in the earlier shots.

[tw2005]

Re: Panasonic TX-P37X20B

Actually, 13 blinks was sounding familiar to me. I have a 42X20A, same generation, different A board TNPH0840 but very similar.

During an eeprom swap/conversion I created a 13 blink, mine stops at 12 in the manual too.

This is what I wrote "After doing all 4 I had SOS9-discharge control SOS, A-board. Looking at the cct I went for IC9304, swapped the other 42" FHD IC9304 - 13 blink- no such code.
Rechecked my work, found bridged resistor pack R8922 which sits right next to 48pin IC8921 NAND Flash- must have brushed it with the tip."

If I was going to have a guess, IC8921 on yours might be bad or corrupted or maybe a power supply issue to it, 3.3 volts supplied at pins 12, 37, gnd at 36,13. Page 50 in that manual.

I think it may be hiding under the alloy heatsink on yours or underside. 48pin , thin rectangular chip. may have a white label with TVRR431 on it.

[snipersquad100]

Re: Panasonic TX-P37X20B

The codes are from this web site. http://www.highdefjunkies.com/plasma...on-thread.html
I've ordered a main board off ebay. cross fingers.

[tw2005]

Re: Panasonic TX-P37X20B

I've done this on that model whilst I was mucking around with the chips, if you remove the 3 white ribbons, I also disconnected vsus from SC,Ss and P35 for vda to the c boards, power up the Tv and if it still blinks 13 in this case it has to be the A board, I don't think it could come from anywhere else really.

[tw2005]

Re: Panasonic TX-P37X20B

The codes are from this web site. http://www.highdefjunkies.com/plasma...on-thread.html
I've ordered a main board off ebay. cross fingers.

Yeah, so it's the 2010 list you should go by not the 2011 but I reckon it will be a comms issue on the A , which is how they expand on that 13 blink in one of the 2011 guides I looked at.

[tw2005]

Re: Panasonic TX-P37X20B

Stating the obvious but it was the same rev, for a 37" that you ordered?

[snipersquad100]

Re: Panasonic TX-P37X20B

how do you release those ribbon cables ?

[tom66]

Re: Panasonic TX-P37X20B

Flip latch and pull lightly on the cable. Very lightly.

[snipersquad100]

Re: Panasonic TX-P37X20B

it's a flip up from the back. hate opening strange connectors for the first time.

[snipersquad100]

Re: Panasonic TX-P37X20B

I disconnected the 3 ribbon cables and the p35 cable but where is the vsus from SC,Ss .

[snipersquad100]

Re: Panasonic TX-P37X20B

is it p2?

[snipersquad100]

Re: Panasonic TX-P37X20B

if it is p2 then it still blinking 13 times.

[snipersquad100]

Re: Panasonic TX-P37X20B

update, I put a new "2nd hand off ebay" board in and now im getting 4 red blinks instead of 13

[tw2005]

Re: Panasonic TX-P37X20B

update, I put a new "2nd hand off ebay" board in and now im getting 4 red blinks instead of 13

So you've got a double fault but surprised the SOS 4 did not show previous, maybe the faulty A was unable to process it.

has this got a TNPA5072 SS board? Most likely shorted vsus.

[tw2005]

Re: Panasonic TX-P37X20B

I missed your P2 question but if the power was removed from the Sc,SS, ribbons removed and p 35 disconnected then The A was faulty.

I had the same deal but in reverse for my 42X20. had SOS4 (shorted SS) then cleared that and ended up with SOS1 A board. I must say that sucks getting a double whammy.

Edit:
So that would be P2/SC2, P11/SS11, P35, 3 white ribbons disconnected power on and still have 13 blinks.

Hope you don't tell me the SS was still connected when you did the test.