Wednesday, January 20, 2016

HITCAHI 42PD7200 - 42PD7A10 Service mode - Power supply adjustments - RGB amplitude adjustment - Self diagnostics - Plasma television repair and service - manual service

Category: Plasma Television respire and Service 

Contents of this article 

  • How to access Service mode 
  • Factory Reset 
  • Self Diagnostics 


HITCAHI 42PD7200 - 42PD7A10

Adjustment
# How to get to Adjustment mode

Using the front control buttons with the set turned off (standby) can activate it.
Press the SUB-POWER button, INPUT SELECT  button and DOWN button at the same time, and hold for more than 5 seconds.
The set turns on in adjustment mode with OSD.
# Changing data and Selecting Adjustment code
When the set is in adjustment mode, the cursor LEFT,RIGHT , UP, DOWN and OK buttons of the remote control or front panel may be used as the adjustment keys.
UP, DOWN buttons are used for selecting adjustment code.
LEFT, RIGHT buttons are used for changing data values.
OK button is used for confirming the data.
After finishing the necessary adjustment press MENU button. Adjustment mode is released and the set returns to normal condition.
# Memory Initialize operation
NOTE: The execution of this function returns the adjustment codes to the preset values, therefore, adjustment data will be lost.
Procedure (1) Enter Adjustment Mode.
(2) Select MEMORY INIT adjustment code (No.658) and change the data value from 0 to 1.
(3) Activate MEMORY INIT by pressing OK button for more than 3 seconds.
(4) Select No.525 and change data value from 1 to 0.
(5) Check that the receiving channel goes to P1. Unit is set to preset values.
Factory Reset
After all of the adjustments of main chassis are finished, perform FACTORY RESET.
Press the SUB-POWER button, INPUT SELECT button and button at the same time, and hold for more than 5 seconds.
The unit is set to factory settings.
Power Unit Vs, Va Adjustment
Preparation
Procedure
(1) Turn on the set and perform
pre-heat run more than 1 min
on burn-in screen.


(1) Turn Vs ADJ to adjust Vs voltage
to be within ±0.1V of the value
specified in the label on the panel.
Adjust within ± 1V at Vs1
Adjust within ± 0.1V at Vs2

(2) Receive full back pattern signal
(or Video silence signal;
but it will be automatically turned off
after a few seconds by power save function.)


(2) Turn Va ADJ to adjust Va voltage
to be within ±0.2V of the value specified
in the label on the panel.
Adjust within ± 1V at Va1
Adjust within ± 0.2V at Va2


3) Connect voltmeter leads to Vs
(or Va) and GND test points of the power unit.


(3)Reconfirm that Vs voltage remains within
±0.1V of the specified value.
Readjust if it’s outside of the margin.

RGB Amplitude Adjustment
Procedure
1. Receive 576p or 480p adjustment signal on AV4 terminal input. Indicate Service Adjustment Menu.
2.Select No.652 (RGB amplitude gain adjustment Main) of Service Adjustment Menu. Press [OK] key more than 2 seconds to start the automatic adjustment.
The adjustment completes when the indication [Auto Mode] at the bottom of the screen disappears.
3.Select No.653 (RGB amplitude gain adjustment Sub) of Service Adjustment Menu.
Press [OK] key more than 2 seconds to start the automatic adjustment.
The adjustment completes when the indication [Auto Mode] at the bottom of the screen disappears.
Video Color Temperature Adjustment (Cool)
Adjustment Procedures
1.Perform the following adjustment with the remote control
2.Set the CRT color analyzer (CA100) at the center of the panel.
3.Ensure that the service adjustment menu (sub menu) No. 0, 1, 2, are all set as 255.
4.After receiving the video signal, step down the two (or one) among adjustment No. 0, 1, 2 and adjust the values as shown below.
At least one of the data shoud be 255.
Specification
Video color temperature (Cool)
x=0.258±0.005
y=0.273±0.005
Troubleshooting
How to get to Burn-in mode
This mode displays the test patterns of some single color raster in turn. These signals are from built-in generator of PDP panel. So it can be presumed that maybe the panel has some trouble when the screen of Burn-in mode is abnormal.
Using the front control buttons with the set turned off (standby) can activate this mode. Press the SUB-POWER( ) button, INPUT SELECT( ) button and VOLUME DOWN( ) button at the same time, and hold for more than 5 seconds.
The set turns on with single color raster and the OSD of [BURN IN: ON].
To escape from this mode, press the SUB-POWER button, INPUT SELECT button and DOWN button at the same time, and hold for more than 5 seconds. Burn-in mode will be released.
How to recover the remote and front key function
If remote and front key cannot operate after miss set special function by front keys, these functions can recover by below method.
Press the SUB-POWER( ) button, INPUT SELECT button and button at the same time, and hold for more than 5 seconds.
The set turns on the service menu mode.
Select No.535 and data set from [0] to [1], and select No.536 and data set from (0) to (1).
Or
Press the SUB-POWER button and DOWN button at the same time, and hold for more than 5 seconds
How to check method of the use accumulation time for panel.
Select No.518 of Service Adjustment Menu.
Signal circuit self-diagnosis function
This function is for the failure of the signal circuit,:
"Sometimes power turns off abnormally." "Sometimes picture disappears abnormally."
To enter to this Self-Diagnosis mode, follow the next steps:
Preparation:
1) The Power Cord should be connected to AC line and the Main Power switch should be turned on.
2) Turn the power off by the SUB-POWER button of the monitor or the remote control.
Procedure:
1) Press the SUB-POWER button and UP button on the bottom of the monitor at the same time, and keep it for more than 5 seconds after the power turned on.
2) The monitor will be turned on, and it will display On-Screen Display of the Self-check result and the failure history as below.
3) Any operation would cancel the Self -Diagnosis mode.
4) The following table shows the OSD symbols and contents of failure PWB in which failure most probably would be allocated according to the number of blinks.