Flow Chart of Troubleshooting
10-1-4. LCD Display part
LCD display is abnormal
Check LCD connection
and replace LCD
| NO | pin#14 of HDC302 | YES |
| Check LCD |
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LCD Backlight is on? |
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| Check HDC302 |
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YES |
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| pin#7 of U404 |
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| NO |
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| C218 > 3.5V? |
| NO |
| Check C218 |
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| YES |
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| pin#6 of U404 | NO |
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| Check UCP201 |
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| is high? |
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| ② YES |
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| CHeck U404 |
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C338, C340 is 2.9V? | NO | |
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YES |
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pin#4 of ZD304 | NO | |
is LOW? |
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YES |
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Are there anysignal | NO | |
at pin#6 of ZD304? |
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YES |
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IS there any | YES | |
problem at F301, | ||
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F302, F303, F304 |
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NO
Check U400
Check UCD301
③
Check U400
④
Replace or resolve F301, F302, F303, F304
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