Hitachi P50H401 P50H501 P50H4011 – How to enter service mode – How to set Va and Vs voltages to plasma display panel

If a repair or a replacement of SMPS board, or after the replacement of plasma Display; it is a must to adjust the Va and Vs voltages as specified on the silk label at the back of the plasma display panel.
POWER SUPPLY Vs, Va voltage adjustment

Click on the pictures to magnify

HOW TO GET TO ADJUSTMENT MODE [Service Mode]
Chassis adjustment mode can be access by pressing the R/C keys MENU + MENU + 8 + SELECT to enter adjustment mode. For some parameters the only way to see them is by selecting the parameter number than press SELECT in order to see it; then DATA can be change if other parameter needs to change then press (Dn) key then repeat the same procedure.
To escape (EXIT) from Adjustment Mode press “INPUT” key on Front panel or EXIT key of R/C to exit service adjustment mode.
ADJUSTMENT PROCEDURE START-UP
The P50H401, P50T501 and the P50H4011 PDP TV sets pass through adjustment procedures during the assembly process. These adjustments must be done to assure the best performance of the PDP set for the consumer.  Also, after servicing, these same adjustments must be done. The adjustments are all made through the I2C bus by changing data in the Adjustment mode menu.

CHANGING DATA AND SELECTING ADJUSTMENT CODE
When the PDP set is in adjustment mode, the cursor  ▲ ▼, ◄  ►   and MENU keys of the remote control or front panel may be used as the adjustment keys.

Use any Hitachi remote control when making an adjustment

▲▼  keys are used for selecting adjustment item.

◄ ►   keys are used for changing data values.
(1) MENU key is used to advance through the adjustment mode menus and pages.

(2) To make a selection, use the NUMBER pad on the PDP R/C ; example : select DEVICE press 69 then SELECT the DATA shown is "EB" ; if this DATA needs to be change press the ►◄  keys to modify, when finish press SELECT key to store the new DATA value to normal condition.

(3) After finishing the necessary adjustment press the R/C EXIT key or EXIT key on the front panel.  Adjustment mode is released and PDP set returns to normal condition.

VIDEO ADJUSTMENT

Note: Perform pre heat-run for more than 20 min. before adjusting.

SUB-CONTRAST & CLAMP OFFSET ADJUSTMENT
Preparation for adjustment
(1) Pre-heat at least 2 min. before the Final Adjust.
(2) Recall user menu and select ‘Video’ > ‘Picture Mode’ > ‘Day(Dynamic)’ > ‘Reset’.

(3) Receive following signal into input3 or input4(Comp) input.

Adjustment procedure

525p Sub-Contrast, Y/Cb/Cr Clamp offset adjustment

(1) Receive following 525(480)p Signal.

(2) Go into Service Adj. Menu and select ‘RGB’ .

(3) Press ► for over 2 seconds and have it perform automatic adjustment. When it’s completed, ‘Auto Adjusting’ on the screen will be disappeared.

MEMORY INITIALIZE OPERATION

NOTE: The execution of this function returns the adjustment codes to the preset values, therefore, adjustment data will be lost.

> Enter Adjustment mode.

> Get to the second page of Adjust Mode by pressing remote control “Menu” key once, or with either the R/C or front panel ▲▼ cursor keys several times.

> Select MEMORY INIT adjust code.

> Activate MEMORY INIT by pressing ► cursor key for more than 3 seconds.

> Check the following process for initialization operation.

Process of Memory Initialize operation.
* A screen is be colored cyan when MEMORY INIT start.
* A screen is be colored green when MEMORY INIT finish normally.
* A screen is be colored red when MEMORY INIT finish abnormally

* Do not unplug from AC outlet until this operation is complete and do not perform any key operation either, after this operation each factory setting and all adjust mode data should reset to delivery settings automatically.

* After Memory Initialize, it should be unplug AC cord.  Unplug and plug AC cord and then all settings and data are updated.

When PDP turns ON , it will tune CH03 this is the complete operation of Memory Initialize process.