Sharp LC-26SH12U Service Manual - Page 16

ELECTRICAL ADJUSTMENTS 1. ADJUSTMENT PROCEDURE Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies. CAUTION • Use an isolation transformer when performing any service on this chassis. • When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back in its original position. • When you exchange IC and Transistor with a heat sink, apply silicon grease on the contact section of the heat sink. Before applying new silicon grease, remove all the old silicon grease. (Old grease may cause damages to the IC and Transistor). Prepare the following measurement tools for electrical adjustments. 1. Patterm Generator On-Screen Display Adjustment 1. Set the VOLUME to minimum. 2. Press the VOL. DOWN button on the set and the channel button (9) on the remote control for more than 2 seconds to display adjustment mode on the screen as shown in Fig. 1-1. TV SIDE BAR 480I Function 01 H POSI OSD 175 Step No. Fig. 1-1 3. Use the Channel UP/DOWN button or Channel button (0-9) on the remote control to select the options shown in Fig. 1-2. 4. Press the INPUT button on the remote control to end the adjustments. 5. To display the adjustment screen for TV, VIDEO1, VIDEO2, ColorStream HD, HDMI-0 and PC mode, press the INPUT button on the remote control. Press the VOL.DOWN button on the set and the channel (9) on the remote control for more than 2 seconds. D-1 NO. FUNCTION 01 H POSI OSD 02 V POSI OSD 03 R DRIVE(N) 04 R CUT OFF(N) 05 G DRIVE(N) 06 G CUT OFF(N) 07 B DRIVE(N) 08 B CUT OFF(N) 09 R DRIVE(C) 10 R CUT OFF(C) 11 G DRIVE(C) 12 G CUT OFF(C) 13 B DRIVE(C) 14 B CUT OFF(C) 15 R DRIVE(W) 16 R CUT OFF(W) 17 G DRIVE(W) 18 G CUT OFF(W) 19 B DRIVE(W) 20 B CUT OFF(W) 21 H POSI 60Hz 22 V POSI 60Hz NO. FUNCTION 23 BAK LIGHT CENT 24 BAK LIGHT MAX 25 BAK LIGHT MIN 26 BRIGHT CENT 27 BRIGHT MAX 28 BRIGHT MIN 29 TINT 30 SHARP CENT 31 SHARP MAX 32 SHARP MIN 33 CONTRAST CENT 34 CONTRAST MAX 35 CONTRAST MIN 36 COLOR CENT 37 COLOR MAX 38 COLOR MIN 39 CONTRAST 40 Fig. 1-2 2. BASIC ADJUSTMENTS 2-1: CONTRAST MAX 1. Receive the monoscope pattern. (RF Input) 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (34) on the remote control to select "CONTRAST MAX". 4. Press the LEFT/RIGHT button on the remote control until the contrast step No. becomes "150" 5. Check if the picture is normal. 6. Receive the monoscope pattern. (VIDEO Input) 7. Press the INPUT button on the remote control to set to the AV mode. 8. Using the remote control, set the brightness and contrast to normal position. 9. Activate the adjustment mode display of Fig. 2-1 and press the channel button (34) on the remote control to select "CONTRAST MAX". 10. Press the LEFT/RIGHT button on the remote control until the contrast step No. becomes "150". 11. Check if the picture is normal. 12. Playback the DVD(480i) disc. (COMPONENT Input) 13. Press the INPUT button on the remote control to set to the COLOR STREAM HD mode. 14. Using the remote control, set the brightness and contrast to normal position. 15. Activate the adjustment mode display of Fig. 2-1 and press the channel button (34) on the remote control to select "CONTRAST MAX". 16. Press the LEFT/RIGHT button on the remote control until the contrast step No. becomes "154". 17. Playback the DVD(480i) disc. (HDMI Input) 18. Press the INPUT button on the remote control to set to the HDMI mode. 19. Using the remote control, set the brightness and contrast to normal position. 20. Activate the adjustment mode display of Fig. 1-1 and press the channel button (34) on the remote control to select "CONTRAST MAX". 21. Press the LEFT/RIGHT button on the remote control until the contrast step No. becomes "139". 22. Check if the picture is normal.