7521Plus / N N/B MAINTENANCE
8.1 NO POWER:
When the power button is pressed, nothing happens ,power indicator does not light up.
| P25 |
| PJ501 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| PL501, PF501 | PD1 | P25 | F2, U23 | P23 | Q22 | P23 |
|
|
|
|
|
|
|
|
| |||
POWER IN |
|
|
|
|
|
|
|
|
|
| |||||||||
|
| PWR_VDDIN |
| VDD5 |
| +S5V |
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
| Q21 | P23 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| PD3, PD4, |
|
|
| VDD5S |
|
|
|
|
|
|
|
| |
|
|
|
|
| P26 | P25 |
| P29 |
|
|
|
|
|
|
|
|
| ||
|
|
|
| PU2 | PL3 |
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
| ADINP |
| D/VMAIN |
| VMAIN |
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
| PQ502 | P27 |
| JO3 | P29 |
|
|
|
|
| |
|
|
|
|
|
|
|
|
| PQ503,PU10 |
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
| +S3V_P |
|
| +S3V |
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
| PQ10 | P29 | JO4 | P29 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| S1.8V |
| +S1.8V |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| PQ504 | P29 |
| PQ13 | P29 | JO5 | P29 |
|
|
|
|
|
|
|
|
|
|
|
|
|
| +3V |
|
| 2.5V |
| +2.5V |
|
|
|
|
|
|
|
|
| PU10,PQ7,PQ9 | P27 | PQ501 | P29 |
|
| L22 | P5 | L7 | P5 | |
|
|
|
|
|
|
|
|
| PL503,PU501 |
|
|
| ICVCC |
| PLLVCC | ||||
|
|
|
|
|
|
|
|
|
| +S12V |
| +12V |
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
| L19 | P5 |
|
| |||
|
|
|
|
|
|
|
|
| PL12,PU18,PU12,PU19, |
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
| P30 |
|
|
| LVDSVCC |
| |||||
|
|
|
|
|
|
|
|
| PU20,PU22,PU23,PL11 |
|
|
|
| ||||||
Note: | P25 |
| :Page 25 on circuit diagram. |
|
|
|
|
|
| VCC_CORD |
|
| L527 | P5 |
|
| |||
|
|
|
|
|
|
|
|
| PU14,PU5 | P28 | JO11 | P29 |
|
|
| DACAVDDB |
| ||
|
|
|
|
|
|
|
|
|
|
| L526,R577 | P5 |
| ||||||
| PD1, PD2, | :Through by parts PD1,PD2,PL3. |
|
|
| 1.8V |
|
| +1.8V |
|
|
| |||||||
| PL3 |
|
|
|
|
|
|
|
|
|
|
| DCLKAVDD |
| |||||
|
|
|
|
|
|
|
| PU14,PU4 | P28 |
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
| L525,R580 | P5 |
| |||
|
|
|
|
|
|
|
|
|
| 1.5V |
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ECLKAVDD | |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
| PU10,PQ7 | P27 |
| PQ3 | P29 | JS11 | P13 |
|
|
| |
|
|
|
|
|
|
|
|
| PQ9,PL503 |
|
|
|
| ||||||
|
|
|
|
|
|
|
|
|
| +S5V_P |
|
| +5V |
| +5VS_FDD |
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| JS10 | P13 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| J02 | P29 |
| +5VS_HDD |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| +S5V | JS503 | P13 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| +5VS_CDROM |
| 104 | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
