REPAIRING AND NOT THROWING AWAY

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!

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

Wednesday, 20 March 2019

PANASONIC TH-42PX75U - H-50PX75U - TH-42PX77U - TH-50PX77U - PLASMA TV - DIAGNOSIS PICTURE FAULTS

PANASONIC TH-42PX75U - H-50PX75U - TH-42PX77U - TH-50PX77U - PLASMA TV - Diagnosis Picture Faults



Picture problem such as “Picture Noise and or Vertical Line”displayed all over the screen is mainly caused by a defective D or A board. The “internal Test Pattern Generator” can help determine whether to replace the D or A board. The D board creates the test patterns. Follow the steps below to confirm the operation of the D or A boards.
Pattern = Abnormal
D Board
Pattern = Normal
A Board (or D board)
TO ENTER THE TEST PATTERN
  • While pressing "VOLUME-" button of the TV set, press "RECALL" button of the remote control three times within 3 seconds.
  • Push button"1" of the Remote Control several times to select the “AGING" setting.
  • Press the number “3" button or the number “4” button of the Remote Control to select the test pattern.
DIAGNOSIS BY REMOVING THE A5 CONNECTOR
Symptom such as “No picture, No OSD, Sound OK” is mainly caused by a defective A or D board. The internal pattern generator cannot be accessed due to the loss of OSD. This method makes it possible to determine whether the A board or the D (SC,SS) is defective.
Diagnosis
Connect the TV after removing A5 Connector
Symptom
No picture (Sound OK)
White Picture = A Board (D board)
No Picture = D board (SC or SS)
BLOCK DIAGRAM & EXPLANATION
  • This white pattern is generated by IC9900 on D board.
  • When the TV is plugged in after disconnecting connectorA5, it turns on automatically and a white picture is provided to the panel drive circuit.  If the panel drive section of the unit is ok, a white picture is automatically displayed by the PDP.
HOW TO DETERMINE THE DEFECTIVE BOARD
PANEL GAS LEAKAGE
Because of a very small crack in the panel, gas leakage will start.  In this picture, gas leakage started at the left top corner.  Finally, gas leakage will lead to the symptom “No picture with buzz noise”
Abnormal Color, Vertical Line, Sync Error, Noise Picture [For all models]
  • A Board, D Board, SC Board, SU Board, SD Board
  • Enter the “Internal Test Pattern Generator”
or
  • Is the screen “White”, after disconnecting the connector “A5”?
  • Test Pattern OK or White Picture displayed
 A ( and possibly D) Board defect.
  • Test Pattern NG or White Picture not displayed.
D, SC,SU,SD Board defect.
Posted By: FRANK at 01:57
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