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

SAMSUNG - PS42Q91HX – PS50Q91HX – PDP TV - TROUBLESHOOTING - DRIVE BOARD TROUBLESHOOTING SUMMARY - SMPS TROUBLESHOOTING TREE

SAMSUNG - PS42Q91HX – PS50Q91HX – PDP TV - TROUBLESHOOTING - DRIVE BOARD TROUBLESHOOTING SUMMARY - SMPS TROUBLESHOOTING TREE

TROUBLESHOOTING
  • Check the various cable connections first.
  • Check to see if there is a burnt or damaged cable.
  • Check to see if there is a disconnected or loose cable connection.
  • Check to see if the cables are connected according to the connection diagram.
  • Check the power input to the Main Board.
  • Check the voltage in and out between the SMPS ↔Main Board, between the SMPS ↔X, Y Main Board, and between the Logic Boards.
CHECK POINTS BY ERROR MODE
SYMPTOM
  • The LEDs on the front panel do not work when connecting the power cord.
  • The SMPS relay does not work when connecting the power cord.
  • The unit appears to be dead.
MAJOR CHECKLIST
The SMPS relay or the LEDs on the front panel does not work when connecting the power cord if the cables are improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:
  • Check the internal cable connection.
  • Check the fuses.
  • Check the output voltages of the SMPS.
  • Replace the Main Board.
TROUBLESHOOTING PROCEDURES {Click on pictures to Enlarge}
THE UNIT IS REPEATEDLY TURNING ON AND OFF
SYMPTOM
The SMPS relay is repeatedly turning on and off.
MAJOR CHECK LIST
  • In general, the SMPS relay repeatedly turns on and off by the protection function due to a defect on a board connected to the SMPS.
  • Disconnect all cables from the SMPS, operate the SMPS alone and check if the SMPS works properly and if each voltage output is correct.
  • If the symptom continues even when SMPS is operated alone, replace the SMPS.
  • If the symptom is not observed when operating the SMPS alone, find any defective assemblies by connecting the cables one by one.
TROUBLESHOOTING PROCEDURE
Caution
WHEN SEPARATING AND CONNECTING THE CABLES SUCH AS CN810, CN809, CN808, CN807 OF THE MAIN SMPS, CN4701 OF THE X MAIN BOARD, AND CN5707 OF THE Y MAIN BOARD, A SPARK MAY BE GENERATED BY THE ELECTRIC CHARGE OF THE HIGH CAPACITY CAPACITOR. THEREFORE, WAIT SOME TIME AFTER DISCONNECTING THE POWER CORD FROM THE UNIT.
AUDIO OK, BUT NO PICTURE
SYMPTOM
  • Audio is normal but no picture is displayed on the screen.
MAJOR CHECKLIST
  • This may happen when the Main Board is functioning but the X, Y Main Board, Logic Board, or Y Buffer Boards are not.
  • The output voltage of the Main SMPS.
  • This may happen when the LVDS cable connecting the Main Board and the Logic Board is disconnected.
TROUBLESHOOTING PROCEDURE
Caution
WHEN SEPARATING AND CONNECTING THE CABLES SUCH AS CN810, CN809, CN808, CN807 OF THE MAIN SMPS, CN4701 OF THE X MAIN BOARD, AND CN5707 OF THE Y MAIN BOARD, A SPARK MAY BE GENERATED BY THE ELECTRIC CHARGE OF THE HIGH CAPACITY CAPACITOR. THEREFORE, WAIT SOME TIME AFTER DISCONNECTING THE POWER CORD FROM THE UNIT
NO SOUND, PICTURE OK.
SYMPTOM
  • Video is normal but there is no sound.
MAJOR CHECKLIST
  • When the speaker connectors are disconnected or damaged.
  • When the sound processing part of the Main Board is not functioning.
  • Speaker defect.
TROUBLESHOOTING PROCEDURE
NO VIDEO
SYMPTOM
  • A normal/cable network analog broadcast screen is blank or abnormal but OSD is OK.
MAJOR CHECKLIST
  • Check the antenna connection settings (Air: NTSC / ATSC, Cable: NTSC)
  • Check the CVBS cable connection.
  • Check the power input of the Main board.
TROUBLESHOOTING
DRIVE BOARD TROUBLESHOOTING TABLE
SMPS TROUBLESHOOTING TREE
CLICK ON THE PICTURES TO ZOOM IN
Posted By: FRANK at 04:59
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