电路图
型号 : 37WL55C
注意:原理图和元件表中标有国际通用危险记号" "的项目表示具有特殊安全性能的元件.更换时应使用与原电路中完 全相同或元件表中指定的元件,并按其原来位置进行安装.在更换上述元件前,请仔细阅读第3页上的"服务安全 预防措施",以免操作不当而影响电视机的安全性能.
关于电压和波形的应遵守事项
1. 用真空管电压表测量所示的测量点对机壳地线的电压,线电压220V,彩色条的信号. 2. 电压读数可以变化±20%. 3. 所示的原理图只是代表性的. 4. 所有的波形都是用一宽带示波器和一个低电容的探头测量的. 5. 为得到最佳图象,检查"精细调谐","AGC""亮度","对比度"和"色彩"控制时,一定要把对比度和色彩旋钮调 在中间位置,"亮度"旋钮几乎放在最大位置. 6. 测量波形时,用了一个标准彩色条信号.
注:
1. 在原理图中表示了主要变压器的直流电阻值.这些值是把变压器与电路断开时测的. 2. 电路改变时,不予通知.
表示
电阻,电容,电感的值
1. 2. 3. 4. 电阻用ohm(欧姆,) 表示,K=1,000 M=1,000,000. 除了在图中特别注明外,所有的电容值在数值小于1时,单位为F(微法) ,数值大于1时,其单位PF (微微法拉) . 除了在图中特别注明外,图中的所有电感值在数字大于1时,单位为H(微亨) ,在数值小于1时,单位H(亨利) . 电容器耐压值除非另有注明均为50伏.
■电路结构示意图:
CONNECTOR ..................................................................................................................................................... 1/50 AV_JACK ............................................................................................................................................................. 2/50 TIF ....................................................................................................................................................................... 3/50 AUDIO_OUT ....................................................................................................................................................... 4/50 REGULATOR ...................................................................................................................................................... 5/50 KEY ..................................................................................................................................................................... 6/50 LED_RMT ........................................................................................................................................................... 7/50 FRONT-AV ........................................................................................................................................................... 8/50 PC-IN_BOARD .................................................................................................................................................... 9/50 TEXT_SW ......................................................................................................................................................... 10/50 CONNECTOR(POWER_BOARD) .................................................................................................................... 11/50 MAIN_POWER(POWER_BOARD) ................................................................................................................... 12/50 SUB_POWER(POWER_BOARD) ..................................................................................................................... 13/50 AC-INPUT ......................................................................................................................................................... 14/50 SIGNAL ANALOG IN [SHEET-200] ...... 15/50 D IN A [SHEET-300] ...... 16/50 D IN B [SHEET-301] ...... 17/50 HDMI (Link, I2C) [SHEET-302] ...... 18/50 HDMI Rx#2 (Video/Audio) [SHEET-303] ...... 19/50 HDMI Rx#3 (PWR,Audio) [SHEET-304] ...... 20/50 HDMI AUDIO PLL [SHEET-305] ...... 21/50 HDMI AUDIO DAC [SHEET-306] ...... 22/50 HDMI AUDIO OUT [SHEET-307] ...... 23/50 HDMI CONTROLLER [SHEET-308] ...... 24/50 EEPROM1 [SHEET-309] ...... 25/50 EEPROM2 [SHEET-310] ...... 26/50 MICRO I/O [SHEET-400] ...... 27/50 OCM MEMORY I/F [SHEET-401] ...... 28/50 FLASH MEMORY [SHEET-402] ...... 29/50 SYNC SEPA [SHEET-403] ...... 30/50 E2P OTHER [SHEET-404] ...... 31/50 STD-BY MICOR [SHEET-405] ...... 32/50 CORTEZ REG 1 [SHEET-406] ...... 33/50 CORTEZ REG 2 [SHEET-407] ...... 34/50 CORTEZ REG 3 [SHEET-408] ...... 35/50 BOOT CONFIG [SHEET-409] ...... 36/50 SERVICE CONNECTOR [SHEET-410] ...... 37/50 I2C Switch [SHEET-411] ...... 38/50 AUDIO (1/2) [SHEET-600] ...... 39/50 (2/2) [SHEET-601] ...... 40/50 CORTEZ 1 [SHEET-700] ...... 41/50 CORTEZ 2 [SHEET-701] ...... 42/50 DDR I/F [SHEET-702] ...... 43/50 DDR SDRAM [SHEET-703] ...... 44/50 DDR TERMINATION [SHEET-704] ...... 45/50 DCDC CONV. [SHEET-802] ...... 46/50 LVDS OUT [SHEET-900] ...... 47/50 LVDS OUT(SHARP LCD) [SHEET-901] ...... 48/50 Power Connector and Dimming [SHEET-902] ...... 49/50 [SHEET-903] ...... 50/50 LVDS Power and Others

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