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.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Saturday, 16 February 2019

PANASONIC TC26LX20 TC32LX20 TC22LR30 PRIMARY POWER SUPPLY CHECK

PANASONIC TC26LX20 TC32LX20 TC22LR30 primary Power Supply Check





PRIMARY POWER SUPPLY CHECK
     Is Standby Voltage at TP-7015 have [7V]?  If not, check Fuse [F7001, F7002 & IC7005].
     If OK, check AC_ON signal at TP7003 - {0.7V}.  If not good, check the Power on the Switch On the 'K' board and the connection between [PK-1 & PAP-1]  If OK, confirm the protect circuit on AP board is working.  D824 should  measure 7V.  If OK, check the main controller IC1106 on the 'DG' board.
     Check the voltage at TP7013 '14V'.  if not good, repair the Sub-power circuit on the 'P' board.
     If OK, check the [120V_ON_ACT] signal at Pin-14 of PP4.  It should measure ~[0V].  If not good, check the voltage at Pin-43 on connector PAP-2 [~0V].  If not good, confirm IC1106 on Circuit board 'DG'.  If Ok, confirm the DC-DC On/Off circuit on the 'AP' board is functioning well.
     If there is [120V_On_ACT] signal, check the voltage at TP-7106 [15V].  If not good, repair or replace main Power Circuit or Main Power Board.  If 'OK' make sure that Main Power 'P' board appears to be working properly.
   Go to troubleshoot to Secondary power supply.
'P' board block diagram [TC-22LR30 Combo model]
P_Board [Primary & Standby Voltage Source block diagram] {TC-32LH_TC26 | 32LX20}
30V Tuner Power Supply Circuit.

Power Supply Troubleshooting Panasonic TC22LR30 TC-26LX20 TC32LX20 LCD TV
TROUBLESHOOTING
If a problem occurs either in the unit or power supply a protection circuit is activated, and the unit shuts down.  The power indicator on the front of the unit will flash red several times indicating an error code.  Error code vary for different models.
LED FLASHES THREE TIMES
  • Is the drive [12V] present on pin-4 of connector PAP7 of AP board?  If NO, Check regulator IC805 on the AP board.  If there is 12V;
  • Is Sub [9V] present on pins 9&10 of connector PAP5 of AP board?  If NO, check regulator IC809 on the AP board.  If 9V is present;
  • Is there [5V] present on pin-8 of Q804 of TP842 of AP board?  If NO, check pin-2 of regulator IC808 or pins 6&8 of connector PAP2 of the AP board.