Acer AL2671W AL2671W Service Guide - Page 23

Hardware Specifications and Configurations Pin Definition Between Main Board and I/O Board Item Specification 1 Teletext_RGB_B ( 6 ) 'Blue' signal comes from Teletext decoder IC. 2 Teletext_RGB_B ( 6 ) 'Green' signal comes from Teletext decoder IC. 3 Teletext_RGB_B ( 6 ) 'Red' signal comes from Teletext decoder IC. 4 Teletext_fast_blanking Fast blanking signal for the use of Teletext decoder IC on I/O module. 5 Teletext_start Main board issues it for the use of Teletext decoder IC on the I/O module. 6 SCART_aspect_ratio_1 Aspect ratio indicator signal comes from pin-16 of ordinary SCART connector. 7 DAC_RST (1) Main board used this pin to reset I2C DAC on current I/O module. 8 TX_232 'TX' signal of UART 9 SVHS_2_C (3) 'Chrominance' signal of SVHS-2 10 SVHS_1_Return (3) Return path paired with Y and C of SVHS-1. 11 SVHS_1_Y (3) 'Y' of SVHS signal set 1. 12 CVBS_1_ CVBS-1 13 GND_1_of_(3) Power ground 14 Audio_Center_GNd_gn 'Ground' path paired with audio 'Center' d (2) 15 Earphone_for_subpictu Audio 'Left' channel paired with sub-picture. re_L (2) 16 Audio_Center_Gnd_gn Audio woofer signal. After decoding Dolby digital or other surround audio, d (2) digital receiver sends this woofer signal to LCDTV main board for further processing. 17 Audio_Rear_L_R_Gnd 'Right' signal of audio rear channels. _of_R (3) 18 YUV_1_Pr ( 6 ) 'Pr' of YUV signal set 1. 19 YUV_1_Pb ( 6 ) 'Pb' of YUV signal set 1. 20 YUV_1_Y ( 6 ) 'Y' of YUV signal set 1. 21 Audio_Front_L- 'Right' channel of surround audio. R_Gnd_of_R (3) After decoding Dolby digital or other surround audio, digital receiver sends this signal to LCDTV main board for further processing. 22 Teletext_Vs ( 3, from Vertical Sync. Signal issued by LCDTV main board for use of Teletext mainboard ) decoder IC on the I/O module. 23 Teletext_RGB_B_Retur 'Blue' signal return for Teletext decoder IC. n (6) 24 Teletext_RGB_G_Retur Return path paired with 'Green' signal comes from Teletext decoder IC. n (6) 25 Teletext_RGB_R_Retur Return path of 'Red' signal comes from Teletext decoder IC. n (6) 26 GND_2_of_(3) Power ground 27 SCART_mode_det_1 SCART mode detection ( RGB or CVBS ) 28 RESET_I_O_Module LCDTV main board uses this pin to reset all components inside the I/O module. 29 RX_232 'RX' signal of UART 30 SVHS_2_Return ( 3 ) Return path paired with Y and C of SVHS-2 31 SVHS_2_Y ( 3 ) 'Y' of SVHS signal set 2. 32 SVHS_1_C ( 3 ) 'Chrominance' signal of SVHS-1. 33 CVBS_1_Return ( 2 ) Return path for CVBS-1 34 CVBS_1_Signal (1) CVBS-2 Chapter 1 23