Sharp LC-26AD22U Service Manual - Page 26
Electrical Adjustments - 26
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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 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) NO. FUNCTION 21 H POSI 60Hz 22 V POSI 60Hz 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 40 FILCKER TEST Fig. 1-2 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. ANT FULL 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 MENU button on the remote control to end the adjustments. 5. To display the adjustment screen for ANT, AV, COLOR STREAM HD, HDMI and PC mode, press the INPUT button on the remote control. To display the adjustment screen for DVD mode, press the TV/DVD button the remoe control. Press the VOL.DOWN button on the set and the channel (9) on the remote control for more than 2 seconds. 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/RIGTH button on the remote control until the contrast step No. becomes "137" 5. Receive a broadcast and check if the picture is normal. 6. Press the INPUT button on the remote control to set to the AV mode. 7. Using the remote control, set the brightness and contrast to normal position. 8. Activate the adjustment mode display of Fig. 1-1 and press the channel button (34) on the remote control to select "CONTRAST MAX". 9. Press the LEFT/RIGTH button on the remote control until the contrast step No. becomes "177" 10. Receive a broadcast and check if the picture is normal. 11. Playback the DVD(480i) disc. (COMPONENT input) 12. Press the INPUT button on the remote control to set to the COLOR STREAM HD mode. 13. Using the remote control, set the brightness and contrast to normal position. 14. Activate the adjustment mode display of Fig. 1-1 and press the channel button (34) on the remote control to select "CONTRAST MAX". 15. Press the LEFT/RIGTH button on the remote control until the contrast step No. becomes "152" 16. Playback the DVD(480p) disc. (COMPONENT intput) 17. Press the TV/DVD button on the remote control to set to the DVD mode.Then perform the above adjustments 6~9. D-1