SHARP LL-T1820-B
Manual de Servicio

PC-UM10M

CHAPTER 4. TROUBLE SHOOTING
Green LED comes on when the power button is pressed? (Yes) Remove the analog signal cable. After a short while time, the LED color changes form green to orange. (Yes) B/L is lit? (Yes) The screen is displayed properly in each video mode? (Yes) No error. (No) Perform 4 (No) Perform 3 (No) Perform 2 (No) Perform 1

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AC cable is connected to the power supply unit? (Yes) The power supply unit is switched on? (Yes) SW100 is on 1st pin side? (Yes) Input signal port is the one to which analog signal cable is connected? (Yes) Test terminal LD805 is DC+5V? (Yes) Test terminal LD634 is DC+3.3V? (Yes) 8th pin of 0808 is DC+5V? (Yes) Test terminals LD416, LD417, and LD418 are DC+3.3V? (Yes) Test terminal LD809 is DC+5V? (Yes) Test terminal LD628 changes its level when POWER switch is turned on and off? (Yes) 4th pin of IC602 is in H level (DC+5 V)? (Yes) C610-side terminal signal of X600 is normal? (Yes)

(No)

Check AC cable connection.

(No)

Check power supply unit switch.

(No)

Check SW100 and circuits around IC100.

(No)

Press INPUT key to switch over to the correct input signal port.

(No)

Check the power supply unit and power supply cable and their connections.

(No)

Check circuits around IC600.

(No)

Check DC+5V power supply line (DV5A) and POWER_CTL1 signal and circuits around 0808.

(No)

Check circuits around IC400.

(No)

Check DC+5V power supply line (AV5) and POWER_CTL1 signal and circuits around 0808. Check MAINPW signal and areas around CN800.

(No)

(No)

Check RESET circuit around IC602.

(No)

Check IC601 and clock circuit around X600.

LL-T1820-H/B TROUBLE SHOOTING

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