92
OPERATING PRINCIPLES OF THE CIRCUIT COMPONENTS
IC904 is the Step-down converter that allows
to obtain VCC3_3V-ST from 5V. IC's to be
supplied when TV is off and Main IC supply is
made from here. Output of this integrated circuit
output is active when TV is in stand-by.
When IC output is faulty, chassis does not carry
out any operations. Led is not lit. No log is re-
ceived.
IC903 Step-down DC/DC con-
verter
(IC-SMD XC6222B181ER-G USP-6C
T&R)
IC903 is step-down converters that allow to
obtain VCC1.8V from VCC3V3. EMMC flash
feed is provided from this integrated circuit.
IC704 Step-down converter
(IC-
SMD XC6222B181ER-G USP-6C T&R )
IC704 is step-down converters that allow to
obtain VCC1.8V from +VCC3V3. Tuner IC is
supplied from here.
IC909 IC604 IC606 Current Limit-
ed power distribution switch
(IC-
SMD XC8107AC05MR-G SOT23-5 T&R)
These ICs are used for voltage switching and
current limiting.
VCC3V3_FE voltage is obtained from VCC3V3-
ST with IC500 and this voltage is used as the
supply to the tuner ICs. If this voltage is not pres-
ent, no digital broadcasts will be received.
Содержание POWERMAX Q2
Страница 1: ...POWERMAX Q2 PROJECT GF CHASSIS SERVICE MANUAL...
Страница 87: ...87 GENERAL OPERATING PRINCIPLE OF THE TV Block Diagram...
Страница 103: ...ENGLISH 103 CHASSIS DIAGRAMMATIC IMAGES Chassis DC Socket VCC DDR...
Страница 104: ...ENGLISH 104 CHASSIS DIAGRAMMATIC IMAGES...
Страница 105: ...ENGLISH 105 CHASSIS DIAGRAMMATIC IMAGES Terrestrial tuner Satellite tuner...
Страница 106: ...ENGLISH 106 CHASSIS DIAGRAMMATIC IMAGES USB...
Страница 108: ...108 FAILURE ERROR ANALYSES...
Страница 110: ...110 FAILURE ERROR ANALYSES...
Страница 112: ...112 FAILURE ERROR ANALYSES...