Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD Boa

[Sevenqi]

Panasonic Plasma TC-P50S30 7 blinks, open cover and took an eye inspection on the SC, SU/SD boards, no obvious damaged components were found.
Checked SC board had voltage while turn on, but disappeared as the tv shut itself off.

So what I did was:

1. Isolated the SC board from the two buffers (SU/SD) by disconnecting.
2. Shorted the SC50 (I used an old IDE hard drive jumper).
3. Plug power cord and Turned on the TV, it powered up constantly, no blinks any more, TV response to the remote control.
4. Unplug the power cord from the wall, wait for 5 minutes.
5. Connected the SC board with the SU/SD board again, TV still turned off and gave 7 blinks.

From this point, I suspected the buffer boards failed, this is a common issue for this model, most likely is the upper board problem, I think the culprit
was that there are no heat sinks for the ICs on the boards. I checked the price on ebay, the upper buffer board was quite expensive.

The two buffer board part numbers are TNPA5336AB/TNPA5337AB. I happed have a pair of TNPA5336AG/TNPA5337AG from Panasonic TC-P50GT30, which is a 3D plasma TV.
Since the part numbers are the same only the suffix are different, I thought they should work.
So I replaced the TNPA5336AB/TNPA5337AB with TNPA5336AG/TNPA5337AG, turn on, TV lite up ! Everything works !
Please note I replaced as a pair. TNPA5336AG/TNPA5337AG boards have heat sinks on top of ICs, so I'm sure the these two boards are more reliable than the old pair.
(The fourth photo was the original boards).

[tw2005]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

Yes, if you do enough digging , it's fairly common to find a heatsinked/non-heatsinked buffer boards that are electrically the same.

I know with the 2010 series , for example a V20 and a VT20 (3D) buffer set are not the same on the SD but the SU are the same.

You can certainly increase your luck doing the research and sometimes works out cheaper.

[Haptic8739]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

Hey there, i have same model tv, same issue, disconnected buffer boards, and tv turned on, and stayed on, when your buffer boards were disconnected, did you get like crazy psychadellic blotches floating all over the screen? Just curious, didnt know if that was indicative of something else wrong. Bad panel too perhaps, bought tv broke for $10, dont know its history.

[tw2005]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

Hey there, i have same model tv, same issue, disconnected buffer boards, and tv turned on, and stayed on, when your buffer boards were disconnected, did you get like crazy psychadellic blotches floating all over the screen? Just curious, didnt know if that was indicative of something else wrong. Bad panel too perhaps, bought tv broke for $10, dont know its history.

Normally you don't see much on the panel when doing this but if it no longer shows 7 blinks then i would say buffers are faulty and would not expect any other issues normally.

[Prop1]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

Hey there, i have same model tv, same issue, disconnected buffer boards, and tv turned on, and stayed on, when your buffer boards were disconnected, did you get like crazy psychadellic blotches floating all over the screen? Just curious, didnt know if that was indicative of something else wrong. Bad panel too perhaps, bought tv broke for $10, dont know its history.

A low resistance failure of the SC board will cause weird pictures. Found that out on mine due to not reconnecting a bleed power resistor, which effective created the same effect. Also discovered that while using different buffer boards may work; it doesn't work the same for the SC. It has to be the right one.

[electronicsurplus]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

I wonder what the difference is between the various suffix on the SC, SU and SD
(ie AJ, BK, BA, etc) As I have tried interchanging some with success and, some without. Is there some IC that would cause them to not work? Since, the Repair kit that ShopJimmy sells simply states TNPA5335 repair kit and does not reference a suffix at all, even though on the website does. There are no notes, etc. on the box or contents

Any ideas?

[tw2005]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

I wonder what the difference is between the various suffix on the SC, SU and SD
(ie AJ, BK, BA, etc) As I have tried interchanging some with success and, some without. Is there some IC that would cause them to not work? Since, the Repair kit that ShopJimmy sells simply states TNPA5335 repair kit and does not reference a suffix at all, even though on the website does. There are no notes, etc. on the box or contents

Any ideas?

various suffixes can mean almost any variation. This could be components, circuitry or simply different connectors and heatsinks.

If you want to know , you'll have to do your own research and comparisons whether it be visual comparison, comparing schematics , part lists etc

[electronicsurplus]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

They are visually the same, Same Connectors, same components and, the same circuitry
I am wondering if they contain some type of eeprom or something that causes them to be different? The only thing I can see different is the part #

[tw2005]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

They are visually the same, Same Connectors, same components and, the same circuitry
I am wondering if they contain some type of eeprom or something that causes them to be different? The only thing I can see different is the part #

no eeprom, but i can tell you the AJ is different in 2 areas at a glance. The thermal sealant on the transformers and the 2 coils as that will be a different panel. the Ba/BK I can't pick without comparing each part on a list

there is something strange with the info on Sj though, the BK they're quoting 50" panel sticker yet show 3 55" models

I'd say the BA/BK are 55", the AJ is 50"

[paulstef]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

I have the same fault, same board, 5336AM.

The chips are the R2A20250. Is there a way to find out which one is faulty?

[tw2005]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

I have the same fault, same board, 5336AM.

The chips are the R2A20250. Is there a way to find out which one is faulty?

Should get a rough idea from simply determining which of the output pins are short with respect to gnd(vfg). then you should be able to guess which chip feeds that pin.

I've broken this diagram for you into the sectors and boxed in brown what are the panel connectors so you should have a good visual reference now.

I've got 2 5336 buffers shorted with only 1 chip, and

[paulstef]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

Should get a rough idea from simply determining which of the output pins are short with respect to gnd(vfg). then you should be able to guess which chip feeds that pin.

I've broken this diagram for you into the sectors and boxed in brown what are the panel connectors so you should have a good visual reference now.

I've got 2 5336 buffers shorted with only 1 chip, and

Awesome, thanks, I'll check them out this evening.

[paulstef]

Re: Panasonic Plasma TC-P50S30 7 blinks fixed by replacing with differnet model SU/SD

Should get a rough idea from simply determining which of the output pins are short with respect to gnd(vfg). then you should be able to guess which chip feeds that pin.

I've broken this diagram for you into the sectors and boxed in brown what are the panel connectors so you should have a good visual reference now.

I've got 2 5336 buffers shorted with only 1 chip, and

Thanks again. Exactly as you said. I had one defective chip, swapped it, everything works great.