SHARP LL-T1620-E
Manual de Servicio

PC-UM10M

2
Check the power unit, the power cable, their connection, the DC+12V power line, and IP1.

Is FB23 at DC+12V ? (Yes) Is CN10-5P at H level (DC+3.3V) ? (Yes) Is CN10-6P at DC+1.0V or below when the brightness is maximum ? (Yes) Is the inverter PWB normal ? (Yes) Check the lamp in the LCD module.

(No)

(No)

Check BLON signal and CN10 peripheral circuits.

(No)

Check IC16 peripheral circuits.

(No)

Replace the inverter PWB unit.

3

Are signals at IC13-17, 24, 40P normal ? (Yes) Are signals at R19 and R71 normal ? (Yes) Is CN12-1P at DC+12V ? (LL-T1620H/B only) (Yes) Is CN9-39P at DC+5V ? (LL-T1520H/B only) (Yes)
Is the signal between IC13 and IC27 normal ? (LL-T1620H/B only)

(No)

Check CN2, IC5, and IC13 peripheral circuits.

(No)

Check the analog signal cable, CN2 peripheral, and IC peripheral circuits.

(No)

Check IP4 and IC25 peripheral circuits.

(No)

Check IP2 and IC25 peripheral circuits.

(No)

Check IC13 and IC27 peripheral circuits.

(Yes)
Is the signal between IC27 and CN12 normal ? (LL-T1620H/B only)

(No)

Check IC27 and CN12K peripheral circuits.

(Yes)
Is the signal between IC13 and CN9,C11 normal ? (LL-T1520H/B only)

(No)

Check IC13, CN9, and 11 peripheral circuits.

(Yes) Are the cables of the LCD unit normal ? (Yes) Replace the LCD unit. (No) Check the cables and related parts.

LL-T1520-H/B LL-T1620-H/B TROUBLE SHOOTING

4�2