Sharp GX30 Service Manual - Page 68

The display does not appear on Main Display., Are L749, C736, C751, CN701

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GX30 CONFIDENTIAL 12. The display does not appear on Main Display. Is Main Display unit fully inserted to CN704? YES Clean the contact point of CN704 and insert the unit again. Does the display appear? NO Replace Main Display. Does the display appear? NO Is 3.6 or more voltage applied to VBAT terminal (FS701) and VBAT_L terminal (FS702)? YES Is 2.8 ± 0.1 V applied to TP170? YES Is 3.0 ± 0.1 V or more applied to TP173? YES Is 1.8 ± 0.1 V or more applied to TP714? YES Is 13 MHz applied to clock TP713? YES Is 3.0 ± 0.1 V supplied from LCD_RST (L749)? Are L749, C736, C751, CN701, and CN703 good in appearance and mounted properly? YES Is 3.0 V ± 0.1 V applied to CN704 pins 34, 37, and 38? Are R737, R738, C774, and C775 good in appearance and mounted properly? YES Is 3.0 ± 0.1 V applied to the LCD reset (CN704 pin 33 and C766)? Is C766 good in appearance and mounted properly? YES Is the signal of approx. 62 Hz present on C760? Are C758, C759, C760, and C761 good in appearance and mounted properly? YES Is the following voltage applied to the terminal? TP720: approx. 10 V Are C771, C772, C773, C776, C777, C779, C780, C781, C782, and C783 good in appearance and mounted properly? YES Main Display unit is defective, or connector CN704 is mounted improperly. NO Improperly inserted to the connector. YES The contact point of the connector is dirty. YES Main Display unit is defective. NO Go to the section "Power is not turned on." (see page 2-48) NO Go to the section "Power is not turned on." (see page 2-48) NO Go to the section "Power is not turned on." (see page 2-48) Regulator IC703 or R716 is defective. NO NO Is 3.0 ± 0.1 V applied to IC703 pin 1? Are R743 and C728 good in appearance and mounted prop- erly? YES YES Are CN701 and CN103 good in appearance and mounted properly? NO CN703 and CN103 are defective or mounted improperly. And FPC is defective. NO Go to the section "Power is not turned on." (see page 2-48) NO L749, C736, C751, CN701, and CN703 are defective or mounted improperly. NO CN704, R737, R738, C774, and C775 are defective or mounted improperly. NO Display controller IC (IC704) and C761 are defective or mounted improperly. NO Display controller IC (IC704), C758, C759, C760, and C761 are defective or mounted improperly. NO Main Display unit, CN704, C771, C772, C773, C776, C777, C779, C780, C781, C782, and C783 are defective. 2 - 60

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GX30
2 – 60
CONFIDENTIAL
12. The display does not appear on Main Display.
Is Main Display unit fully inserted to CN704?
Improperly inserted to the connector.
Clean the contact point of CN704 and insert the unit again.
Does the display appear?
The contact point of the connector is dirty.
Replace Main Display.
Does the display appear?
Main Display unit is defective.
Is 3.6 or more voltage applied to VBAT terminal (FS701) and
VBAT_L terminal (FS702)?
Go to the section “Power is not turned on.” (see page 2-48)
Is 2.8
±
0.1 V applied to TP170?
Go to the section “Power is not turned on.” (see page 2-48)
Is 3.0
±
0.1 V or more applied to TP173?
Go to the section “Power is not turned on.” (see page 2-48)
Regulator IC703 or R716 is defective.
Is 1.8
±
0.1 V or more applied to TP714?
Is 3.0
±
0.1 V applied to IC703 pin 1?
Are R743 and C728 good in appearance and mounted prop-
erly?
Are CN701 and CN103 good in appearance and mounted
properly?
CN703 and CN103 are defective or mounted improperly. And
FPC is defective.
Is 13 MHz applied to clock TP713?
Go to the section “Power is not turned on.” (see page 2-48)
Is 3.0
±
0.1 V supplied from LCD_RST (L749)?
Are L749, C736, C751, CN701, and CN703 good in appear-
ance and mounted properly?
L749, C736, C751, CN701, and CN703 are defective or
mounted improperly.
Is 3.0 V
±
0.1 V applied to CN704 pins 34, 37, and 38?
Are R737, R738, C774, and C775 good in appearance and
mounted properly?
CN704, R737, R738, C774, and C775 are defective or
mounted improperly.
Is 3.0
±
0.1 V applied to the LCD reset (CN704 pin 33 and
C766)?
Is C766 good in appearance and mounted properly?
Display controller IC (IC704) and C761 are defective or
mounted improperly.
Is the signal of approx. 62 Hz present on C760?
Are C758, C759, C760, and C761 good in appearance and
mounted properly?
Display controller IC (IC704), C758, C759, C760, and C761
are defective or mounted improperly.
Is the following voltage applied to the terminal?
TP720: approx. 10 V
Are C771, C772, C773, C776, C777, C779, C780, C781,
C782, and C783 good in appearance and mounted properly?
Main Display unit, CN704, C771, C772, C773, C776, C777,
C779, C780, C781, C782, and C783 are defective.
Main Display unit is defective, or connector CN704 is mounted
improperly.
NO
YES
YES
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
NO
YES
YES
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES