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

PIONEER PDP 4280X ADJUSTMENT WHEN THE SERVICE PANEL ASSY IS REPLACED - PLASMA DISPLAY

 

PIONEER PDP 4280X

ADJUSTMENT WHEN THE SERVICE PANEL ASSY IS REPLACED -  Plasma Display

ADJUSTMENTS AFTER PANEL REPLACEMENT
After the panel is replaced with one for service, voltage margin adjustment is required.
Basically, voltage margin adjustment is performed using the Panel Factory menu.
After the panel is replaced and the unit is turned on, clear the pulse meter first.
For details on how to clear the pulse meter check previous posts here: 
  • As various corrections are made referring to the pulse-meter count to calculate how long the panel has been used, if adjustment of the panel for service is performed without clearing the pulse-meter count, proper adjustments will not be performed.
  • The drive sequence for 60-Hz video is used for adjustment. When adjustment is made using the Panel Factory menu, the current drive sequence is displayed on the screen, as shown in the figure below. Make sure that 60VS is always indicated during adjustment.
Example of the On-Screen display during Panel Factory mode
CLICK ON THE PICTURES TO ZOOM

In the "PANEL-1ADJ" layer, the Panel White Balance value is reset to default, Panel Gamma is set to Straight, and Noise is
set to OFF.
In this case, *-- - - - -/****" (**** represents the current drive sequence) is displayed on the third line of the On-Screen display during Panel Factory mode.
If adjustment is performed using RS-232C commands, the following commands must be transmitted for preparation:
[PAV S00]: To set panel drive mode to Factory
[VFQ S03]: To set Drive Sequence to Video 60 Hz
[WBI S01]: To temporarily reset the Panel WB adjustment value to default (WBI S00 cancels this setting.)
[PGR S00]: To set the gamma R value to that for Factory mode
[PGG S00]: To set the gamma G value to that for Factory mode
[PGB S00]: To set the gamma B value to that for Factory mode
[DIZ S03]:Dither ON,L dither ON, noise OFF
If the unit is shut down during the above adjustment flow, resend the above commands from the beginning.
Replacement with the panel for service is completed.  [Procedures for resetting corrections for change over time]
Procedures for stabilizing the panel before adjustment
If you perform the adjustment by RS-232C commands, the following commands must be added  before going to the main flowchart (1):
[PAV S00]: To set panel drive mode to Factory
[WBI S01]: To temporarily reset the Panel WB adjustment value to default (WBI S00 cancels this setting.)
[PGR S00]: To set the gamma R value to that for Factory mode
[PGG S00]: To set the gamma G value to that for Factory mode
[PGB S00]: To set the gamma B value to that for Factory mode
[DIZ S03]:Dither ON,L dither ON, noise OFF
Main flowchart (2) - Checking VOL YNOFS3
Make sure that the values for VOL SUS(*1), VOL OFFSET, VOL RST P(*1), VOL XPOFS1,2(*1) and VOL YNOFS1, 3, 4 are the  final setting values.
The tentative setting value becomes the final value.

Posted By: FRANK at 05:37
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