Sharp LC-90LE657U, Service Manual

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LC-90LE657U
6 – 4
[3] TROUBLESHOOTING TABLE
•
LED Backlight does not turn on.
If it is not an error of power supply/LED driver,
It is start-up in the lamp error disregard mode.
Do you start?
YES
When main unit is replaced, does it start normally?
YES NO
Replace main unit. When LCD control unit is replaced, does it start normally?
YES
NO
Replace LCD control unit.
When the parts in the panel can be replaced.
→
Replace all LED-bars in the panel module.
When the parts in the panel cannot be replaced.
→
Replace panel module.
If it is not an error of power supply/LED driver,
It is start-up in the lamp error disregard mode.
Do you start?
NO
When power supply unit is replaced, does it start normally?
YES
NO
Replace power supply unit.
When main unit is replaced, does it start normally?
YES
NO
Replace main unit.
When LCD control unit is replaced, does it start normally?
YES
NO
Replace LCD control unit.
When the parts in the panel can be replaced.
→
Replace all LED-bars in the panel module.
When the parts in the panel cannot be replaced.
→
Replace panel module.