Tc-55as680u steady blink

[ReeceyBurger123]

Re: Tc-55as680u steady blink

Nice and cheap fix! I would order more leds , if 1 goes bad the others will follow

No need to order more just turn the backlight way down problem solved

[ReeceyBurger123]

Re: Tc-55as680u steady blink

Nice work as well I did a 50" Lg panel today with 9 bad in total 2 open 7 shorted I used the stacking method for repair turned the bl down to about 30% looks good and will hopefully last. Keep us updated on it.

[Redlee80]

Re: Tc-55as680u steady blink

[Moreno83]

Re: Tc-55as680u steady blink

Ok , looks like the backlight is on , is that correct? If so the leds and powersupply are working.

It looks like a mainboard issue to me. Tried updating the firmware and see if you get a picture?

[Redlee80]

Re: Tc-55as680u steady blink

Yes it powers on but no picture and after some time goes by powers off and then the red light blinks. How do I update firmware?

[Moreno83]

Re: Tc-55as680u steady blink

http://av.jpn.support.panasonic.com/.../fw/index.html

Search the exact model and download the firmware. You need a usb flashdrive.
They provide instructions how to update the tv. Not sure if it will work but it MIGHT give a picture......

When did the fault occur?

[Redlee80]

Re: Tc-55as680u steady blink

This tv is outside under my Palapa and last Thursday I went outside to watch football and it was flashing. I unplugged it for a minute or so and then it worked. Friday evening noticed it flashing again but nothing I do seems to get it working.

[Moreno83]

Re: Tc-55as680u steady blink

Ok , you don't think it has water damage? ( moist air? )

Service manual says 13 blinks is the mainboard. Maybe the cpu has bad BGA Soldering , hard to find out though.
Can you try the following?

LCD Panel Test Mode Purpose:

To find the possible failure point where in LCD Panel or Printed Circuit Board when the abnormal picture is displayed.

How to Enter:

While pressing [VOLUME ( - )] button of the main unit, press [YELLOW] button of the remote control three times.

How to Exit:

Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.
How to confirm:
If the abnormal picture is displayed, go into LCD Panel test mode to display the several test patterns. And then, judge by the following method.

Still abnormal picture is displayed: The cause must be in LCD Panel.

Normal picture is displayed: The cause must be in A board.

Remarks:
The test pattern is created by the circuit in LCD Panel.
In LCD Panel test mode, this test pattern is displayed unaffected by signal processing for RF or input signal. If the normal picture is displayed, LCD Panel must be okay and the cause of failure must be in A board.

[Moreno83]

Re: Tc-55as680u steady blink

This is the service manual for the AS650. Don't think there is much difference between those 2 models though. Maybe extra hdmi/usb for example.

[Redlee80]

Re: Tc-55as680u steady blink

I don't think there is any water damage. I had it on a surge protector but we have had some heavy storms lately. I don't have the remote control I typically use the Direct Tv remote and if I have an app on my phone and ipad to control it. Where can i buy an A board? Is it cheaper to just replace the tv?

[Moreno83]

Re: Tc-55as680u steady blink

Nah you need to buy the A board. There is a board number on it TNPH......

Just look on Ebay , they are not that expensive. $50/60 i guess.

[Redlee80]

Re: Tc-55as680u steady blink

TNPH1103 I can't seem to find anything in the United States...

[Moreno83]

Re: Tc-55as680u steady blink

Cant find it either. Maybe look for a smashed tv or mainbkard from the 650?

[ReeceyBurger123]

Re: Tc-55as680u steady blink

My bad I didn't follow the post properly which is why my first comment is off topic, also I agree with Morie the Mb is failed possibly bga solder issue maybe give it a reflow ?

[Redlee80]

Re: Tc-55as680u steady blink

How do I find a bad solder joint? Not sure what a reflow is?

[telephone]

Re: Tc-55as680u steady blink

Hi, picking this t-shoot up again. have this set and does not work (why else would i be here!). plug it in, hear relays click in, then out, a moment later it clicks back in. does not respond to remote. remote is transmitting (observed via mobile phone camera). hold on/off button on rear of set for about five seconds, i hear the relay click, the leds come on, the red power light comes on and there is no picture, but the screen is a dark blue. still does not respond to remote. does not respond to reset (-volume + setup on remote). five minutes later it shuts down. No trouble codes - no flashing power button. Have checked +5, +16 & +24 - all good. Removed and reseated all connectors. Is there any way to trouble shoot this thing?
>> HELP <<

[telephone]

Re: Tc-55as680u steady blink

update to previous -
Updated information. After the unit shuts down after the approximate 5 minutes of on-time, sometime after that it starts flashing the power led - 13 times. AND, I can turn the unit back on with the remote - but still the same blue screen - and no further responses to the remote. it then shuts off after another five minutes.

[Bigkahuna427]

Re: Tc-55as680u steady blink

Hi Guys,

I have the same model build date is Feb 2015. My symptoms are a steady blink from the power light and nothing else. One blink 3 seconds one blink. I have the back off and it has 5V standby power but not the 16V to the main board. When I plug it in here is a black relay that clicks the backlight LEDs flash a couple of times and then clicks again which is when the power light starts flashing again. I am assuming this is a protection relay. When it clicks the first time (I assume on) I get the 16V at the jumper that says SRV 16V. I did disconnect the T-con board and the protection relay still clicked on and off. I am not sure if disconnecting the T-con board isolates the LEDs as the original poster had LED issues causing a similar problem. I hope this is enough to get started and someone is willing to help. Can someone help me isolate this problem?

My skills are mostly self taught and I have been repairing old audio amplifiers and receivers stuff like Marantz Sansui etc so this is all solid state stuff. I have little or no experience with LCD TVs. I certainly do have a multimeter, solder station, Chinese component tester etc.

[psp_comm]

Re: Tc-55as680u steady blink

Your first hunch was right... It was 1 LED that was keeping the whole TV from working... I jumped it with a wire until the part comes in.

3rd row 3rd led... go figure.

Thanks so much for all you help...

Can you please show in your picture, where this 3rd row 3rd led is?

[Garykapda]

Re: Tc-55as680u steady blink

Hello, I now have the exact problem that phat34 had, I cound not understand how he "jumb" the wire to identify what led is bad.. Can someone help me?