LC
-
37D44E/S/RU-BK/GY
3 – 1
LC37D44E-BK
Service Manual
CHAPTER 3.
ADJUSTMENT
[1] After replacement of any PWB and/or IC for repair, note the following.
1. When replacing the following units, be sure to prepare the new units loaded with updated software.
• Note that an IC into which ROM data is written is available for MAIN-UNIT servicing (see below)
2. After replacing the LCD panel, adjust the VCOM in the following procedure.
1) Enter the process adjustment mode.
2) Use the cursor keys
/
and P
/
of R/C to select the item [
VCOM ADJ] on the page 11/11.
3) Press the OK key to verify that the adjustment pattern is displayed.
4) Use the + / - keys of VOL of L/C to adjust the flicker in the center of the screen to minimum.
5) When the optimal state is achieved in Step 4, press the OK key to turn the pattern to OFF.
[2] SOFTWARE UPDATING
There are 2 methods to update software in the VCTp: I2C method, RS-232C HyperTerminal and RS-232C Tera Term method.
• RS-232C method is allowed when the TV is working properly and the action should be only software upgrade.
1. RS-232C Method Description (HyperTerminal).
The hardware tools requirement are:
1. A Modem-null (Cross type) DB9 female to DB9 female cable.
2. Make the connections as indicated in the figure:
Before using RS-232C updating method is necessary to configure a Terminal PC software. HyperTerminal has been selected as a Terminal soft-
ware because it’s include in all Windows versions as an accessory, and you can find it inside “Accessories\Communications” folder. For this rea-
son, please follow carefully the next steps:
1) First time HyperTerminal is used, it’s necessary to configure some settings. Follows next action to configure two connection: low speed
(9600bps) and high speed (115200bps).
2) Create a New Connection file with name “P55_9600bps”.
3) Select a free COM port and select the Port Settings properties as follows:
MAIN-UNIT:
DUNTKE449FM03
IC1902
RH-iXC448WJZZS
EDID (HDMI)
IC1922
RH-iXC447WJZZS
EDID (HDMI)
IC1201
RH-iXC206WJZZS
EDID (PC)
IC8101
RH-iXC564WJZZS
EEPROM
Computer
TV set
RS-232C
IOIOI
TV Set
