Service Adjustments - Hitachi 50VF820 Service Manual

TO GO TO AN ADJUSTMENT, CLICK ON ITS HEADING BELOW
1. CHASSIS ADJUSTMENT................................................................................................................................... 32
Service Menu Access .................................................................................................................................................32
1-1.
1-2. Memory Initialize ....................................................................................................................................32
1-3. Factory Reset ...........................................................................................................................................33
1-4. Factory and Service Adjustments ...........................................................................................................33
2. FINAL ASSEMBLY ADJUSTMENT (Adjustment order) ..................................................................................33
2-1. Preheat run conditions ............................................................................................................................33
2-2. Subcontrast Adjustment .........................................................................................................................33
2-3. Raster Position Adjustment ....................................................................................................................34
2-4. Flicker Adjustment ..................................................................................................................................34
2-5. Ghost Adjustment ...................................................................................................................................34
2-6. NRSH Adjustment ..................................................................................................................................34
2-7. Display Area Specifications ....................................................................................................................35
Gamma Correction (White Balance) ....................................................................................................36
2-8.
2-9. Color Uniformity (White Uniformity) ....................................................................................................37
2-10. Drive Adjustment Check .......................................................................................................................38
2-10-1. Dot Stripe Checking ...................................................................................................................38
2-10-2. Sub Ghost Checking ..................................................................................................................38
2-10-3. Horizontal Crosstalk Checking ...................................................................................................38
2-11. Lamp Door Protection Operation Check ...............................................................................................39
2-12. Lamp Holder Protection Operation Check
2-13. High Temperature Protection Operation Check ....................................................................................39
2-14. Temperature Sensor Data Setting .......................................................................................................40
2-15. Checking of Temperature Sensor
2-16. Adjustment I
2-17. Adjustment OSD Flow Chart
2-18. Troubleshooting Flow Charts .............................................................................................................................88
*IMPORTANT
For many of the above adjustments, it is necessary to have an HDTV (1080i or 720P) signal generator, SDTV (480P)
signal generator, as well as the usual NTSC (480i) signal generator.
Hitachi recognizes that few companies offer HDTV or SDTV signal generators and that the cost of these generators is
sometimes prohibitive. For this reason, we suggest the use of a set-top-box for HDTV and SDTV adjustments. Usually,
there is a switch on the set-top-box which enables it to output HDTV (1080i or 720P) or SDTV (480P) signals even with
no input. In this case, the sync is automatically detected by the TV (at the Y-P
TABLE OF CONTENTS

SERVICE ADJUSTMENTS

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2
C Parameter List ..............................................................................................................42
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P
B
31
LC58/LC58E
Inputs on the rear panel).
R