Sharp LC-60LE452U Service Manual page 24

60” fhd 120hz led tv

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5.4.2 Function Troubleshooting（No Search Channels）

Debug RF

signal machine

1.Repair the U5 voltage (3.3V)

2.Repair the U7 voltage (3.3V)

1.Repair U7 timing circuit

2.Repair U3 timing circuit

Sharp LC-60LE450U/LC-60LE452U Service manual

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Channels

Check RF signal

1.Check the U5 voltage (3.3V)

2.Check the U7 voltage (3.3V)

1.Check U7 I2C

2.Check U3 I2C

1.Check U7 timing signal

2.Check U3 timing signal

1.Check the connection of U7

2.Check the connection of U3

Change U3

1.Repair U7 or U3 I2C circuit

2.Check the connection of U7 or U3

3.Change U7 or U3

1. Welding U7

2 .Welding U3

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Troubleshooting

Lc-60le450u