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 _ 4280XD – 4280XA – 428XD HOW TO ENTER SERVICE MODE - PROTECTIONS

PIONEER PDP _ 4280XD – 4280XA – 428XD  

HOW TO ENTER SERVICE MODE - PROTECTIONS -

SERVICE MODE / FACTORY MODE
  • By using a PDP service remote control)
PDP service remote control  : Press [FACTORY] key.
  • By issuing RS-232C commands )
During normal Standby mode  : Issue [PON] then [FAY].
During normal operation mode  : Issue [FAY].
  • How to exit Service Factory Mode
#  By using a PDP service remote control)
PDP service remote control  : press [FACTORY] key.
#  Supplied remote control unit  : press [HOME MENU] key.
By issuing RS-232C commands)
Issue [FAN].
REMOTE CONTROL CODE IN SERVICE FACTORY MODE
When ten seconds have passed since the [DRIVE OFF] key was pressed at the standby, it becomes invalid.
Press [POWER] key from the [DRIVE OFF] key pressing within ten seconds when you do power supply ON while driven OFF.
CLICK ON THE TABLE TO ZOOM
SERVICE FACTORY MODE TRANSITION CHART
FUNCTIONS WHEN ENTERING THE SERVICE FACTORY MODE
The settings for the following functions are set to OFF when Service Factory mode is entered (including when the “FAY” command is received) :
User data will be treated as follows:
  1. User data on picture-quality and audio-quality adjustments are not reflected, and factory-preset data are output  (user data will be retained in memory). When the unit enters Service Factory mode, the current audio-quality adjustment  data will be still be retained in memory.
  2. User-setting data will be applied to the various settings (items on the menus), signal formats, and the items that are  associated with path change (HDMI settings, etc.).
  3. Data on screen (i.e., screen position; meaning clock dividers, and not including data on screen size).  Are reset to the default values (data stored in memory will be retained).   Screen size will be retained.
SERVICE REMOTE CONTROL
The keys labeled with the same names on the service remote control unit have the same functions as those of the supplied  remote control unit.
For the keys not provided on the supplied remote control unit, see the explanations below:
PROTECTION FUNCTIONS
HIGH-TEMPERATURE PROTECTION FUNCTION - 1
The panel temperature (TEMP1) reaches 70 °C, the limit for the maximum count of plasma discharge will be gradually decreased to lower the temperature of the panel.
  • This function is activated based on the TEMP1 temperature.
  • The limit for the maximum count of plasma discharge will be decreased 8 per 5 seconds.
  • The lowest limit for the maximum count of plasma discharge is about 700.
  • The maximum count of plasma discharge will begin to increase gradually if the panel temperature falls to the specified temperature.
HIGH-TEMPERATURE PROTECTION FUNCTION - 2
If the panel temperature (TEMP1) reaches 65 °C, the plasma-discharge count that is determined based on the input APL will be decreased. In actual operation, the ABL adjustment value will be offset.
  • This function is activated based on the TEMP1 temperature.
  • The ABL adjustment value will be decreased by one step per 30 seconds.
  • The ABL adjustment value will begin to increase gradually if the panel temperature falls to the specified temperature.
PANEL PROTECTION FUNCTION-1 [Protection against still picture]
If a still picture is displayed for 3 minutes or more, the limit for the maximum count of plasma discharge will be gradually decreased to minimize the effects of phosphor burn.
  • This function is activated after detection if the displayed picture is still (the picture will be considered to be still if only the  mouse cursor is moved).
  • The limit for the maximum count of plasma discharge will be decreased 8 per 5 seconds.
  • The lowest limit for the maximum count of plasma discharge is about 700 (it takes about 15 minutes to reach the lowest limit,  although the required time varies depending on the displayed picture).
  • The maximum count of plasma discharge will begin to increase gradually if the displayed picture is changed to animated picture.
Note: How to decrease the brightness level in this function is the same as in high-temperature protection function 1
PANEL PROTECTION FUNCTION-2 [SCAN IC Protection]
If a particular load is applied to the SCAN IC, the limit for the maximum count of plasma discharge will be gradually decreased.
Note: How to decrease the brightness level in this function is the  same as in high-temperature protection function 1
PANEL PROTECTION-3 [Protection against panel cracking]
A bright window, as shown in the figure on the right, on the screen increases the heat of the panel. If such a pattern is recognized on the screen, the limit for the maximum count of plasma discharge will be gradually decreased.
Note: How to decrease the brightness level in this function is the same as in high-temperature protection function 1
Posted By: FRANK at 05:33
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