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 !

Saturday, 16 March 2019

HOW TO TROUBLESHOOT - SAMSUNG HL T5076 - SCREEN ERRORS - SERVICE MODE - INTERNAL NOISE

HOW TO TROUBLESHOOT - SAMSUNG HL T5076 - SCREEN ERRORS - SERVICE MODE - Internal Noise


 SCREEN ERRORS
  • 40 Vertical lines 16 pixels wide:  DDP3021 or BGA, DMD panel interference.
  • Replace the DMD board or DMD Panel.
Horizontal Bar or No Raster: Error in DAD2000 or DMD Panel or other DMD board problem.  Replace the DMD board or DMD Panel.

Dotted Vertical Bar:  Error in Rambus Dram(IC 403) or the soldering.  Replace the DMD board.
Beehive mosaic patterns all over the screen:  Error in the TMDS Receiver (IC100) or the soldering.  The H sync signals are not transferred to DDP3021.  Check the Digital Board and DVI cable If there was no problem, Replace the DMD board.
VIDEO CIRCUIT ERROR CHECKING
Basics:
  • The DDP3021 on the DMD board has a feature to display internal test patterns.
  • SDP62, which is an end port in the digital board, has a feature to display internal test patterns.
  • The rear board is the first output and the main board is the second one, followed by DMD, which is the final one.
Diagnosis By Module
  • Access Service Mode.  (In Standby mode, press "Mute", "1", "8", "2" and "Power" to turn the screen on and enter service mode)
  • Check if there is an error in the DMD board DDP3021 →TEST PATTERN →Press the right arrow key:  Options of FULL WHITE, BLACK, RED, GREEN and BLUE PATTERN are displayed on the screen.  If "Pattern" does not appear, this is a DMD board error.
  • Check if there is an error in the main board before the DMD.  When the DMD board has been determined to be error free based on the test patterns:  FACTORY MODE àSDP62 àTEST PATTERN normal display: no error in the main board.  If "Pattern" does not appear, you have to check a rear board first, and check a DMD Board second, next check a main Board.
  • Check for a power signal from the SMPS to the main boards.
NOISE
A foreign substance on the fan or driving device may cause internal noise.  For a DLP TV, the lamp fan, DMD board fan and color wheel are vulnerable to noise. Sometimes the connector wire around the lamp or DMD fan makes contact with the fan, while the color wheel is protected inside the module and cannot make contact with any nearby wires. However the color wheel sensor or the drive motor may cause noise by making contact with the color wheel.  As the color wheel uses an air bearing system, it has a very slight possibility of creating internal noise.
When irregular noise occurs for no particular reason, check the inside of the TV for any foreign substances.  The DLP projection TV may cause noise as the physical screen is empty inside, causing a resonance to a particular frequency.  Thus a low vibration is not a malfunction.
Any 'creaking' noise is mostly from the structure of the device itself. A short, harsh noise may occur from a distortion or malformation due to thermal expansion between the metal joints, screws and loaded parts, respectively. Any intermittent 'creaking' noise can be removed by loosening the screws.
  • A black screen with the lamp on: Replace the DMD board.
  • Line Pattern: Regular line patterns occur vertically or horizontally: Replace the DMD board.
  • Voice Distortion: Replace the main or rear board.
  • Outside Light: This is not a product malfunction, but a possible installation or human error. This occurs when the projected light from the surrounding illumination reflects onto the screen. This disappears as the TV starts operating and the TV lamp gets brighter. However, you can avoid outside light by changing the position of the TV or the installation angle.  Decreasing the illumination or changing the indoor lighting may work.
  • Screen Flip-over:  Enter Factory mode in DDP3021 and perform H-Flip (flip horizontally) and V-Flip (flip vertically).  The screen will flip over horizontally or vertically.
Blinking Temp & Timer LED CLICK ON THE PICTURE TO ZOOM
Posted By: FRANK at 06:03
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