Sharp LC-26SH10U Service Manual - Page 16
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 (YG6260M) on the contact section of the heat sink. Before applying new silicon grease, remove all the old silicon grease. (Old grease may cause damage to the IC and Transistor). Prepare the following measurement tools for electrical adjustments. 1. Pattern Generator 2. BASIC ADJUSTMENTS 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. 2-1. TV 01 H POSI OSD 346 Fig. 2-1 3. Use the UP/DOWN button or Channel button (0-9) on the remote control to select the options shown in Fig. 2-2. 4. Press the MENU button on the remote control to end the adjustments. 5. To display the adjustment screen for AV, CS, HDMI mode, press the INPUT button on the remote control to set to the AV, CS, HDMI mode. Press the VOL.DOWN button on the set and the channel (9) on the remote control for more than 2 seconds. NO. FUNCTION 01 H POSI OSD 02 V POSI OSD 03 R DRIVE (N) 04 R CUTOFF (N) 05 G DRIVE (N) 06 G CUTOFF (N) 07 B DRIVE (N) 08 B CUTOFF (N) 09 R DRIVE (C) 10 R CUTOFF (C) 11 G DRIVE (C) 12 G CUTOFF (C) 13 B DRIVE (C) 14 B CUTOFF (C) 15 R DRIVE (W) 16 R CUTOFF (W) 17 G DRIVE (W) 18 G CUTOFF (W) 19 B DRIVE (W) 20 B CUTOFF (W) NO. FUNCTION 22 H POSI 60Hz 24 V POSI 60Hz 25 BAK LIGHT CENT 26 BAK LIGHT MAX 27 BAK LIGHT MIN 28 BRIGHT CENT 29 BRIGHT MAX 30 BRIGHT MIN 31 TINT 35 CONTRAST CENTER 36 CONTRAST MAX 37 CONTRAST MIN 38 COLOR CENT 39 COLOR MAX 40 COLOR MIN 63 CONTRAST 40 64 BRIGHT (3F54) 65 CONTRASR (3F54) 66 SRC TOP 67 DFEA VIMGVT Fig. 2-2 2-1: WHITE BALANCE 1. Place the set in Aging Test for more than 15 minutes. 2. Receive the gray scale pattern from the Pattern Generator. 3. Press the INPUT button on the remote control to set to the AV mode. 4. Using the remote control, set the brightness and contrast to normal position. 5. Activate the adjustment mode display of Fig. 1-1 and press the channel button (03) on the remote control to select "R DRIVE (N)". 6. Press the UP/DOWN button on the remote control to select the "R CUTOFF (N)", "B DRIVE (N)", "B CUTOFF (N)", "R DRIVE (C)", "R CUTOFF (C)", "B DRIVE (C)", "B CUTOFF (C)", "R DRIVE (W)", "R CUTOFF (W)", "B DRIVE (W)" and "B CUTOFF (W)". 7. Adjust the RIGHT/LEFT button on the remote control to whiten the R CUTOFF (N), B DRIVE (N), B CUTOFF (N), R DRIVE (C), R CUTOFF (C), B DRIVE (C), B CUTOFF (C), R DRIVE (W), R CUTOFF (W), B DRIVE (W) and B CUTOFF (W) at each step tone sections equally. 8. Perform the above adjustments 5 and 6 until the white color is looked like a white. D-1