Wednesday, May 27, 2015

HITACHI 53SWX10B SERVICE MODE AND POWER SUPPLY CIRCUIT

HITACHI 53SWX10

REAR PROJECTION TV

SERVICE MODE AND POWER SUPPLY CIRCUIT 


ASSEMBLED P.W.B. ADJUSTMENT
Service Menu Access
Adjustment Procedure
(1) Press and hold INPUT key on Control Panel and then press POWER key on control panel to access I2C 
adjustment mode.
(2) Receive signal on main picture. (NTSC, SDTV or HDTV).
Some menu pages have I2C adjustments for SDTV and HDTV. The set will automatically allow you to set these items only when a SDTV or HDTV signal is input to the COMPONENT jacks on the back of the TV.
(3) Check the OSD according to table on pages 31~37, using THUMB STICK ,  on Remote Control.
*: Adjustable Data
Others: Fixed Data (be careful not to change)
(4) Press EXIT key to exit I2C ADJUST mode.
NOTE: (1) If the TV I2C data is different from the I2C Parameter (pages 31~37) for fixed data, change the data.
(2) When exchanging microprocessor or EEPROM and TV is turned on for first time, it requires initialization of Memory Initial of I2C adjustment menu.
(3) Use FACTORY RESET to set TV to out of factory shipping conditions: Do not use MEMORY INITIALIZE.
Comb filter operation check
Adjustment preparation
(1) Receive the color bar signal at the regular tuning point.
(2) Set the CONTRAST control to MAX and the other controls to center.
(3) Set the PERFECT PICTURE to OFF.
Adjustment procedure
(1) Check that between the color bars there are line dots every second color bar
Video Settings (Advanced Settings)
Perfect Picture Check
(1) Receive the color bar signal.
(2) Select video mode by THUMB STICK cursor.
(3) Use THUMB STICK  to highlight advanced settings and then press THUMB STICK  to enter Advanced Settings Mode.
(4) Select Perfect Picture by pressing THUMB STICK .
(5) Check that the display becomes dark when the light sensor QM002 (light detect transistor on the control P.W.B.) is covered with hands.
(6) Set Perfect Picture to OFF by pressing select button and check that contrast of the display returns to normal.
Auto Color Check
(1) Set to the color control to MAX.
(2) Select Auto Color.
(3) Set Auto Color: OFF by pressing select button and check the red part of color bar signal grows deeper.
(4) Retrun to Auto Color: ON by pressing select button.
(5) Retrun the color control to center.
Noise Reduction Check
(1) Receive the color bar signal.
(2) Select noise reduction.
(3) Check that the noise in the picture is reduced.
Color Temperature Check
(1) Receive Circle pattern signal.
(2) Select COLOR TEMPERATURE.
(3) Check that the picture is reddish when set to WARM and bluish when set to COOL. Velocity Modulation Check
(1) Select VELOCITY MODULATION.
(2) Check that the edge of the vertical line of the picture is thicker.
Black Level Expansion Check
(1) Select BLACK LEVEL EXPANSION.
(2) Check that the Black Level is sink at black portion of picture.
High Voltage Adjustment (should NOT be readjusted in field).
Adjustment preparation
(1) Connect High Voltage meter to FBT High Voltage output. Connect GND of High Voltage meter to CPT GND or FBT GND.
(2) Check that High Voltage adjustment VR (RH17) is set to mechanical center. (located behind FBT on DEFLECTION PWB).
(3) Receive circle pattern signal.
(4) VIDEO control should be reset.
Adjustment procedure
(1) Adjust High Voltage to following spec. by turning VR RH17 slowly. ADJ. SPEC = 31.7±0.2kV(DP17),
= 30.2±0.2kv(DP14G).
(2) After adjustment, fix VR RH17 with Silicone glue (KE40RTV).
INAL ASSEMBLY ADJUSTMENT
Cut Off Adjustment
Adjustment preparation
(1) Adjust screen VR s on Focus Pack fully counterclockwise.
(2) Adjust Focus VR s on Focus Pack fully clockwise.
(3) Set video conditions to factory preset.
(4) The vertical incident illumination on the screen should be 20 lux or less (room should be dark).
Adjustment procedure
(1) Press and hold INPUT key on control panel and then POWER ON to access I2C adjustment mode.
(2) Choose “SERVICE” item from I2C adjustment menu by pressing THUMB STICK .
(3) Screen VR should be turned clockwise gradually and set so that retrace line begins to appear.
(4) Return to “NORMAL” mode by THUMB STICK  again.
(5) Adjust Focus VR’s so that focus is even all around screen.
POWER SUPPLY CIRCUIT 
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