REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
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Monday, 25 February 2019

PANASONIC - TH-42PX75U - TH-50PX75U - STANDBY LED BLINKS 7 TIMES AT START UP - NO SWITCH ON]

PANASONIC - TH-42PX75U - TH-50PX75U - STANDBY LED BLINKS 7 TIMES AT START UP - NO SWITCH ON]


APPLICABLE TO - PANASONIC - TH-42PX75U - TH-50PX75U - TH42PX77U -TH-50PX77U

Trouble Mode:  Sc floating voltages SOS.
Defective boards [suspected]:  SC, SU, SD, P board.

Make sure that the connectors P2/SC2, SC20/D20 are sealed properly; no loose connections.
  • Disconnect the connectors SC2, and SC20 from SC board.  Turn ON the TV.  Does the TV power up and stay ON?  
  • If yes; Connect the connectors SC2 and SC20 to the SC board.  Remove the SU board.  Turn the TV On.  Does the TV power up and stay On? If yes, SU board is faulty.
  • If No; install the SU board and remove the SD board.  Turn the TV On.  Does it power up, and stay On?  
  • If yes; SD board is faulty.  
  • If No; SC board is faulty.  If the SC board does not fix the problem, replace 'D' board too.
  • Turn on to the first step above.  If No
  • Turn the TV On.  Measure the voltage at pin number '1' of 'CN P25' on P board.  Does 15V appear there before the unit suts down?  
  • If No; replace P board. 
  • If yes; Turn the TV On.  Does VSUS voltage appear at pin number'1' of CN P2 of the 'P' board before shut down?  
  • If yes; replace 'SS' board.
  • If No; replace 'P' board.
Vsus is about 180V.  Accurate voltage is provided on the panel label.  
Before connecting P2/SC2 or P11/S11, discharge is necessary to prevent potential shock caused by Vsus volt