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Panasonic TC-P42S1 Plasma TV | 7-blinks

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Old 08-24-2011, 02:00 PM   #1
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Default Panasonic TC-P42S1 Plasma TV | 7-blinks

Hey all,

I'm hoping I can find someone here who knows a bit about Panasonic and their SC boards on the plasmas they sell.

I have the 7-blinks error: Driver SOS2 (SC floating voltage)

This indicates an issue somewhere in the SU, SD or SC boards.

---

Procedure thus far:
  1. Which board?
    • Disconnected upper buffer (SU); no change.
    • Disconnected lower buffer (SD); no change
    • Disconnected YSUS (SC) board; 8-blinks.
  2. Check all driver voltages.
    • Vsus
    • Ve
    • Vset
    • Vad
    • Vscn
    • Vda
    • All voltages OK.
  3. Maybe it's the INIT-F Voltage?
    • This was obviously a bad choice. I adjusted the pot and the voltage overload made something pop and sizzle. D'oh. I've burnt up two YSUS boards, but the thing is, no matter what, I get the 7-blinks (even with a brand new YSUS board from Encompass Parts).

Someone please help me out with what to check next! I'm so confused! I have the service manual and can take pictures, etc. So let me know what you need to assist. I'm stumped on this one!

Last edited by crkalino; 08-24-2011 at 02:02 PM. Reason: formatting
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Old 09-02-2011, 03:19 PM   #2
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Its not a voltage problem. You do not seem to know what you are doing. Install the sc board and leave the sd and su disconnected. The set will stay up and running as long as you have not damaged anything else in there. Make sure the ribbon is disconnected between the su and sd boards. connect them one at a time. if either of them cause the 7 blink, replace that board. if they blow agian you are probable looking at a panel fault. Before you spend more money on boards i think you should perform a careful inspection of your panel. look for anything abnormal
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Old 09-06-2011, 10:08 AM   #3
How can anyone watch standard def?
 

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Thanks for your input! When the SC board is connected by itself (SD and SU disconnected) I get the 7 blinks error code. What does this tell you?
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Old 09-06-2011, 11:02 AM   #4
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With the su and sd board disconnected. All 4 screws labeled H.V. Danger and the 3 connectors. There is a little tiny 2 pin slot that is empty labeled sc50. You have broken the floating ground path by removing those 4 ground screws. to complete the path, those two pins must be shorted. Then try it and see if the set comes up. DO NOT LEAVE IT JUMPED WHEN YOU RECONNECT THE SU AND SD BOARDS.
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Old 09-06-2011, 12:37 PM   #5
How can anyone watch standard def?
 

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The 4 screws have been removed, and I've shorted the pins at SC50. The diagnostic lights have not changed their pattern. It's still blinking 7 times.
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Old 09-07-2011, 07:17 AM   #6
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Ok, So you may have inadvertantly damaged your new sc board, and may need to be replaced again. If I had to guess at this point, it is possible that a shorted su or sd board could be taking out your sc. A panel short could also cause the su and sd boards to short. If you decide to continue, then i would remove the ribbon connectors at the panel.
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Old 09-07-2011, 11:31 AM   #7
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Okay, so I believe the SC board is, indeed, shot. I recall that there was a "pop and sizzle" at some point on the SC board when it first showed up here. If I were to get a new SC board, what would be your next diagnostic step?
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Old 09-07-2011, 12:41 PM   #8
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Disconnect the ribbons from the SD and SU from the panel. Get a new SC board. Disconnect the small ribbon connector from inbetween the su and sd. install the new Sc board with just sc2 and sc20 connected. startup the set and see if it stays up. Unplug the set. Connect the sd board and see if the set stays up. if not disconnect the sd. connect the su board and repeat. replace sd and su as necessary. If you're still going at this point you can install the new board(s) (keep them separate from the panel)! Run the set, if it stays up then connect the ribbon connectors from the panel to su and sd. run the set. If it works then you have successfully repaired your television, if not you are most likely looking at a panel issue.
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Old 09-07-2011, 01:04 PM   #9
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Okay! Thanks so much for your help! I have been stumped on this one for a long time now, and really would like to get it up and running! I'll fill you in on what happens!
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Old 09-07-2011, 01:14 PM   #10
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You are very welcome
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