LENCO lenco tft700 sch free download

File name lenco_tft700_sch.pdf

Service Manual of TFT-700 Service Manual of TFT-700 Damageable Parts CSC2600, B1203,CPU, High-Voltage fuse N25,High-Voltage Circuit Audion, Transformer, On/Off switch, Flat Cable, LCD Panel 1. Scenario: No sound, No picture, No light Whether Power LED is working in RED YES Press POWER button and test pin 29 of CPU, see if voltage change from 05V or 50V NO Test whether CPU 5V power supply is OK YES NO Is Button input pin voltage right? NO Is CPU C1815,B1203 and Is IC M61260pin32 voltage OK? back power circuit shorted? NO YES Change CPU YES Test circuit of CPU pin 22 Original Cause to IC M61260 pin 32 NO NO YES Change B1203 Is IC M6260pin12 voltage right? C1815 to avoid short Is all circuit coming out from power supply voltage right? NO YES IC M61260 Bad Is IC M61260 pin 12 power supply circuit OK? YES NO Repair Power supply or relative circuit. NO NO Change High-voltage circuit Is there High - Voltage output? Check High-Voltage circuit N25 broken? audion or high-voltage transformer YES Change LCD Panel -1- Service Manual of TFT-700 2. Scenario: Abnormal Color Is IC M61260 pin14,15,16 output voltage OK? NO Is IC M61260 h