Panasonic TC-50PU54 8 blinks picture flashes then dead

[dimafl666]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

Exact model 55st50. When I replaced ss board in first place 8 blinks never stopped, so that's when I replaced A board. After I replaced A boarding was like, hmmm, what if replaced ss board was junk, so I went back to my original ss board. All same, no blinks now, just solid red light with no picture. Will make pictures tomorrow. Both of the replaced boards I got from eBay, different sellers, both claimed boards came from working tv

[tw2005]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

I hope someone can help. My st50 had 8 blinks. First I replaced ss board, that didn't help, still 8 blinks. So I replaced A board next, blinks stopped, I get solid red light but no picture. Any ideas what's next? I saw on 7 blinks diagram that if no picture, replace su sd board. Is that what needs to be done or tv is no good no more?

Exact model of TV and full view hi res photos of original A board and the new one so we can check if they are the same revision boards.

Do you have a multimeter? Always a chance replacement SS board was dud. Where did you get that?

[dimafl666]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

I hope someone can help. My st50 had 8 blinks. First I replaced ss board, that didn't help, still 8 blinks. So I replaced A board next, blinks stopped, I get solid red light but no picture. Any ideas what's next? I saw on 7 blinks diagram that if no picture, replace su sd board. Is that what needs to be done or tv is no good no more?

[carlsedillo]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

I just did my panasonic TC-P50UT50 8 blinks problem.
Ordered kit off ebay for $25.00 'Valley tv service' alumbra Ca.
The ss board looked messed up from heat - all over.
Started to remove components and messed up some of the circuit board. The solder was very hard to remove. The resistor is very hard to do since so tiny. I removed heat sink and transistor and diode first to get to smd resistor. Started last night took 5 hours - prayed a lot but watching NFL on it this morning. Beautiful picture. Thanks everyone.

[GTjacket]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

Tried this repair with the kit, worked for an hour and fifteen minutes then died again. Has anyone bought the replacement board and had success? The kit didn't seem to do it for me.

[tw2005]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

Actual original resistor value per my Fluke is 6.1 ohm. A bit out of spec. from 5.6 ohm
I did replace gate driver as a matter of course. Did not test original device.
Yes, devices were secured to heatsink with thermal paste. Gate driver is SMD SOIC. I used my Hot Air Rework workstation to ensure ground pad was appropriately soldered to the board.
The heatsink for the two devices was hot enough to sizzle the moisture on my finger. So devices were overdriven or heatsink is undersized.
Not sure how to test driver chip.

If a Fluke gave 6.1 and the tips and pads were clean , I'd consider replacing that resistor. My fluke (73) has a test lead resistance of 0.2 and those 5.6 resistors on a board I have(not the same board) read 5.7 and I've tried several .

It's a metal film 5.6 OHM, 1/3W 5%. At 6.1 it's at 7.14%(depending on your leads) I'd find another 5.6 on that board or the SC and compare but it may be partially damaged and under use and heat the resistance may be unstable.

[atedesco]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

Actual original resistor value per my Fluke is 6.1 ohm. A bit out of spec. from 5.6 ohm
I did replace gate driver as a matter of course. Did not test original device.
Yes, devices were secured to heatsink with thermal paste. Gate driver is SMD SOIC. I used my Hot Air Rework workstation to ensure ground pad was appropriately soldered to the board.
The heatsink for the two devices was hot enough to sizzle the moisture on my finger. So devices were overdriven or heatsink is undersized.
Not sure how to test driver chip.

[tom66]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

Also, did you use thermal paste and properly secure devices to the heatsink? My guess would be bad driver IC too.

[tw2005]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

I also was presented with a Panasonic TC-P50U50 Plasma with the (in)famous 8 blink syndrome.
I noticed scorch marks on 2 SS board mounting screws: the top, and the one near the Vsus connector.
Based on scorch marks, service manual flowchart, the great info on this forum and a technical bulletin (TB-13-02) from Panasonic, all suspicion fell to a defective SS board, specifically: Q051, D041 and R051.
The gate resistor (R051) teseted fine, however, the diode and IGBT were shorted.
These parts were replaced using the ShopJimmy repair kit, including sanding the scorch marks and installing the better mounting screws. To ensure good electrical contact, I also refreshed the solder around the screw mounting holes where the bottom of the SS board contacts the metal frame. As the screws form part of the circuit return path, (such a poor design choice!) the screws were torqued down nice and tight.
The repair worked great! For about 10 minutes!
The power relay clicked open, and set presented the annoying 8 blinks. As the rear case was open, I noticed the D041/Q051 heatsink was extremely hot. Analysis shows D041 and Q051 again shorted. Vsus measured about 210v+_. So I don't suspect the power supply. While it worked, picture was great.
Ideas on this are welcome and appreciated before I replace the SS board. Thanks.

Not sure but i think i've read some have had to replace the driver IC as well. So the resistor read correct value ?

[atedesco]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

I also was presented with a Panasonic TC-P50U50 Plasma with the (in)famous 8 blink syndrome.
I noticed scorch marks on 2 SS board mounting screws: the top, and the one near the Vsus connector.
Based on scorch marks, service manual flowchart, the great info on this forum and a technical bulletin (TB-13-02) from Panasonic, all suspicion fell to a defective SS board, specifically: Q051, D041 and R051.
The gate resistor (R051) teseted fine, however, the diode and IGBT were shorted.
These parts were replaced using the ShopJimmy repair kit, including sanding the scorch marks and installing the better mounting screws. To ensure good electrical contact, I also refreshed the solder around the screw mounting holes where the bottom of the SS board contacts the metal frame. As the screws form part of the circuit return path, (such a poor design choice!) the screws were torqued down nice and tight.
The repair worked great! For about 10 minutes!
The power relay clicked open, and set presented the annoying 8 blinks. As the rear case was open, I noticed the D041/Q051 heatsink was extremely hot. Analysis shows D041 and Q051 again shorted. Vsus measured about 210v+_. So I don't suspect the power supply. While it worked, picture was great.
Ideas on this are welcome and appreciated before I replace the SS board. Thanks.

[tw2005]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

Is it possible to post manual for TC-P55ST50 please. I have exact same problem. 8 blinking lights of death.

[dimafl666]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

I have TC-P50UT50 since Aug-2012 and all of a sudden yesterday TV went bad with 8 Blink behavior. I've extended warranty so trying to go through that first.

But after searching through different Panasonic service manual, it seems like issue is with specific Transistor on SS Board. Most likely Q16051 which is most commonly used IGBT in Panasonic Plasma. Attached is the Panasonic Technical Bulletin and the exact part u can order.

Is it possible to post manual for TC-P55ST50 please. I have exact same problem. 8 blinking lights of death.

[ddpl]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

If it's under wty yes, if not ouch that may be expensive. So after the SS was replaced has it been good for ages now intermittent? maybe get the back off and check the screws are tight or that he board is earthing correctly. that seems to be the issue may save the SS blowing and all it may be.?

have you read this

https://www.badcaps.net/forum/attach...8&d=1393180957

I attempted the repair. Before it, the TV would shut off into 8 blink mode after around 5 minutes. Now it lasts about an hour before doing the same thing.

This was the state of the SS board:

http://imgur.com/cN8iwyk

Does it look like it's worth replacing with a new one?

I really want to get this TV to work again. IMO LED is not good enough to replace plasma yet.

[whiz62]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

Yep! Same issue with my neighbors son's TV. Pretty strange.

[dkraines]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

8 blink error after 30-45 minutes of being on.

Top screw on SS board was not tight, I can see arcing marks between the SS board and metal chassis. Why wouldn't Panasonic tighten that particular screw, the others were tight.

[tw2005]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

I am having the same intermittent recurrence. I haven't attempted a repair just yet - may just send it in to Panasonic.

If it's under wty yes, if not ouch that may be expensive. So after the SS was replaced has it been good for ages now intermittent? maybe get the back off and check the screws are tight or that he board is earthing correctly. that seems to be the issue may save the SS blowing and all it may be.?

have you read this

https://www.badcaps.net/forum/attach...8&d=1393180957

[ddpl]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

Hey guys, has anyone had any luck resolving the 8 blink issue when it is intermittent? TV will power on and stay on between 5 seconds and multiple days before the 8 blink outage occurring) I have had my SS and A Board replaced (twice) so far and this hasn't done the trick. Any chance it could be coming from the power supply board?

I am having the same intermittent recurrence. I haven't attempted a repair just yet - may just send it in to Panasonic.

[PTHerring]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

Hey guys, has anyone had any luck resolving the 8 blink issue when it is intermittent? TV will power on and stay on between 5 seconds and multiple days before the 8 blink outage occurring) I have had my SS and A Board replaced (twice) so far and this hasn't done the trick. Any chance it could be coming from the power supply board?

[Dan76]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

I have a TC-P50UT50 as well. I got this TV in April 2012. First, I lost its two HDMI ports around August 2014. I was then watching my TiVo through its HD Component inputs until I could maybe get this repaired. Recently, I got the 8 blinks of death too and was not happy that it has already totally failed. I did not get the extended warranty either.

I figured I had nothing to lose before I took it to a local repair shop so I called Panasonic up as an unhappy customer. I explained the situation and how I was not real pleased that two components on this TV failed within 2yrs of getting it. I have a Sony that is 3 yrs old with not a single problem and would consider Sony for my next HDTV purchase.

Long story short....Panasonic gave me a case number and told me to take it to a local designated shop for repair (about 30mins away). Along with my receipt from best Buy, Panasonic will now cover most of the parts cost for both of these issues. It will only cost me about $150 in labor charges.

I personally do not like getting extended warranties and realize they are gambles no matter how you look at it. I also figure I am still coming out ahead here as the GeekSquad warranty at the time was $200 for 2yrs.

In case anyone else has this issue, you may want to try something similar. Can't hurt and only will require your time to make the phone call.

Was the tv successfully repaired?

Did they give you a list of what parts they replaced and or any other work completed?

....

Great input in this forum. Currently doing my homework to hopefully resolve this same 8 blink (due to lightning through the hdmi input from cable box), on a different model Panasonic (TC-P65GT30). This has been the most informative forum I have come across thus far, much appreciated to all who have posted here.

Thanks,
Dan

[whiz62]

Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

Spratt22 did you clean arcing marks on board and frame and replace screws with lock washers? Just wondering cause I just repaired one for a neighbor and the kit I got came with new screws.