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PDF E2209Wf Data sheet ( Hoja de datos )
| Número de pieza | E2209Wf | |
| Descripción | LCD Monitor Service Manual | |
| Fabricantes | DELL | |
| Logotipo |  |
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Service Manual
LCD Monitor E2209Wf
Service Manual
0
1 page  
Service Manual
Chapter 2- SERVICE TOOLS & EQUIPMENT REQUIRED
1. SIGNAL GENERATOR
2. MULTIMETER
3. SCREW DRIVER
4. OSCILLOSCOPE
5. Soldering IRON
6. SOLDER (Lead free, RoHS compliance)
7. Color Analyzer
8. Fox_VISP_Programmer
9. Fox_VEDID_Programmer
4
5 Page 
Service Manual
When the sense voltage across the sense resistor R859, reaches the threshold voltage around 0.85v,
the output GATE drive will be turned off. Every time when the output of power supply is shorted or over
loaded, the FB voltage will increase, the build-in PWM output will then be turned off. Both of two will
prevent the power supply from being overheated under over loading condition. The PWM duty cycle is
determined by this current sense signal and VFB, the feedback voltage, when the voltage on sense pin
reaches V-(PWMcopm) =(V - )/3, A switch cycle will be terminated immediately, Vcomp is internally
clamped to a variable voltage around 0. 85 V for output power limit
When Q850 are turned off, the main current flow will be consumed through D85 , C8 ,
R853/R854/R855
, This will prevent Q850 from being damaged under large current impulse and
voltage spike.
2.2.4)DC_ V and 5V Output Circuit and Feedback circuit:(fig.7)
fig.7
D854/D855 is used to rectify the inducted current. 86 is used to store energy when current is
reversed. The parts including C8 are used to smooth the current waves that are from D854/D855, then
27V voltage is supplied;
D8 is used to rectify the inducted current. R86 and C8 are used to store energy when current is
reversed. The parts including C8 , C8 , C868, and L85 are used to smooth the current waves that are
from D8 , then Vvoltage is supplied;
V and 5V supply voltage feed back to PWM controller U850 via R871, R872, R868 and
I850,I851.R86 ,C8 and C8 used to control respond time.
10
11 Page | ||
| Páginas | Total 51 Páginas | |
| PDF Descargar | [ Datasheet E2209Wf.PDF ] | |
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