Question about Pioneer PDP-5020FD 50" 1080p KURO Flat Panel HDTV

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Panasonic Kuro pdp-5020 8 blinks of red led

Unit failed to come on one day, when attempting to power up relays click screen quickly shows some sparse colored static then relays release and the screen goes black. Red light blinks 8 times indicating an SS board. A prior repair tech attempted to replace the Y-Scan board with no benefit; but, he thought the board was likely used. I'm experienced with the use of diagnostic equipment and own multi-meters and can obtain access to an o-scope. Can someone offer me more in depth understanding of all options that could be cause the 8 blink code and guidance on identifying internal components; as well as, troubleshooting the possible causes? Thanks for any help.

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  • Tony Nov 05, 2012

    Order the service manual and measure the voltage to all diferent circuits.

  • James Fountain Nov 07, 2012

    Just as an update. I was mistaken the Y board was not replaced; in fact, the power supply was replaced with no change. I appreciate the suggestion that I buy the manual but I was hoping someone might be able to help me trouble shoot my problem. I found a better outline of the 8 blinks and it indicates the likely problems are: Address assy, Digital assy, y board, x board, power supply. If anyone can please direct me towards a method of isolating which board is my issue I would appreciate it.

  • Tony Nov 09, 2012

    If You have the service manual, Measure all voltages according to.What is missing?

  • Tony Nov 09, 2012

    Even in shutdown You should have voltages.Do you replace the Power supplyModule?Or you may have a shorts.

  • James Fountain Nov 10, 2012

    elitcap, I posted a little more detail below under Tony's input. Thanks.

  • Tony Nov 10, 2012

    Voltages that are in the service manual are very precise VDC.I did work as a bench

  • Tony Nov 10, 2012

    Tech, at component level for Sony and Zenith Corp.I'm retired now.

  • James Fountain Nov 10, 2012

    Excellent, thanks again for all of the help. Last question then I'll jump into replacing the power supply. Is it possible that the power supply voltages are a symptom of another problem (ie other boards) or do you believe the low voltages are the cause of the problem? Thanks again and have a great day.

  • Tony Nov 10, 2012

    Either you have a defective power supply.Or a short in any other PCB,you can eliminate by disconect one board at the time & see if the voltage came to normal if that happens The disconected board is at fault

  • James Fountain Nov 13, 2012

    All, right I tracked down an addendum and it looks like all of the voltages fall within specs. 17v is allowed +-5%, 12v+-10% 6.5+10%-7% 5.1+-5%. All of the pins appear to be outputing correctly. I did notice when the main assy was disconnected the voltages changed to 17.16, 11.94, 6.82, 5.1 and 3.4. No other boards had an affect on the power supply. Any ideas?

  • James Fountain Jan 28, 2013

    My 8 blink saga continues. The 8 blink code apparently indicats that the VADR voltage is low; however when checking the VADR at each individual address assembly the voltage is 75.1 volts for each assembly. Just to give it a shot I have replaced the y and main boards. I have noticed something odd that I think is probably pertinent to my problem. If I remove the ribbon cable from any of the upper address boards and power the tv on the blink code changes to 2 red blinks. However, if I remove the ribbon cable from any of the lower address boards the 8 blink code remains. I'm not sure how to interpret this but I think it is important. So as a recap; the voltages from the power y and x board look fine; the voltages arriving at the address boards looks fine; out of desperation I replaced the Y and main boards. The power supply appears to have been replaced prior to the previous owner giving up on repairs, though the outputs aren't perfect they appear to be within spec(see comment above). Surely someone can help me, at this point I'm willing to pay a fee to someone that can give me a solution to repairing this television.


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Is power voltage going to the Panel screen?Can you measure that?
Check power supply voltage distrbuition line.

Posted on Nov 04, 2012

  • 5 more comments 
  • James Fountain Nov 05, 2012

    Where should I check for power output? There are quite a few lines coming out of the power board, I'm really not sure which I sould be testing for power. Thanks for your help.

  • Tony Nov 07, 2012

    You need to order the service Manual and confirm each voltage to circuits.

  • Tony Nov 07, 2012

    Without this verification You Can't find the problem.Good luck.

  • James Fountain Nov 09, 2012

    I ordered a manual; however, the data still assumes I know more about TVs than I do. Can you give me some direction on how to check the power output when the unit automatically shuts down the moment you try to power it up? Furthermore, if it turns out that the correct voltages are being supplied how can I isolate which board is actually at fault? The manual give directions on general areas to start; however, it doesn't have any information on how to isolate which board is actually the problem. Thanks elitcap.

  • James Fountain Nov 10, 2012

    I figured out what was needed to check the voltage. When it enters powerdown mode there is no output. When the unit is in standyby it has now power output except on the standby circuits. The unit does have output for about 5 seconds during powerup immediately following plugging the unit up. After about 5 seconds a relay clicks and the non standby circuits all fall to 0.4v. During the 'boot' period, for lack of a better term, all of the +17v circuits=17.22v; all of the +6.5v=6.62v, all of the +5.1v=5.1; all of the +3.4v circuits=3.4v, all of the +12v circuits=11.84-11.86v. I'm not sure what the acceptable range is for the 12v circuit. Any input on where to go from here? Thanks again for all of your help guys.

  • Tony Nov 10, 2012

    The voltage that is specified on the service Manual.Other that that, are incorrect voltages, that is why the TV is not working

  • James Fountain Nov 10, 2012

    Most electronics have acceptable ranges for their output, is it safe to assume that you believe that the power output required for a plasma has a very narrow range. Are you even suggesting that output has to be exactly the allowed values? I'm not trying to be a pain but am asking just as much for me as for anyone else who reads this. I see you answer mostly TV questions do you have any experience with replacing board components rather than entire boards? Thanks.


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Posted on Jan 02, 2017

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SOURCE: Pioneer PDP 5030 power supply problem

Ok here's how I manage solve the problem... Having the back removed opens the contacts on the interlock switch so I guess if it powers up in this state it senses the high voltages are exposed and for safety shuts down... After this the unit will not power up and the power led flashes red continuously as described before…
After some thought it occurred to me that there may not be a problem at all, just be a simple reset function for this condition… I managed to find an easy solution to this… Just call up the hidden engineer’s service menu – On 3rd generation Pioneer Plasmas it’s as follows > Power down the screen > Hold down the “Input” and “Vol +” buttons on the front > Power the screen up and the Service menu comes up on the screen > You don't need to change anything just simply power off and from then the screen should operate as normal…It did for me so I’m well happy now!!
I hope this information will help someone else one day – Good Luck!!…Rob UK…

Posted on Jan 04, 2008

  • 456 Answers

SOURCE: TV will not power up. red LED blinking 5 times

I always found the problem to be either a combo of the x-sus printed circuit board and the y-sus printed circuit board. It is also very worth checking out your poer supply circuitry as well. Good Luck.

Posted on Aug 27, 2009

  • 22 Answers

SOURCE: plasma turened off and red light flases twice

Red flashing x2 = Panel power supply fault

It would be easier to replace the power board than attempt a repair at component level (dangerous voltages)

Posted on Jan 12, 2008

  • 479 Answers

SOURCE: no picture on Pioneer plasma

first of all check out the fuse that mostly get blowned out in this problems.if the fuse is perfect then it could be the faulty capacitor issue check out on the main board with the help of the multimeter and replace the faulty ones and it should work properly.

Posted on Dec 10, 2008

  • 1 Answer

SOURCE: I turn on the unit the green light on the monitor

This is no time out for no signal it si power supply !!! You have too get new one !!!!! I had same problem with my tv!

Posted on Jun 24, 2010

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