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EN 52
7.
QFU2.1E LA
Line
filter
ACin
198 V - 264 V
Check
Normal operation
Apply the mains voltage (AC
Pull the Standby pin to LOW (GND)
Pull the BL_ON_OFF pin to HIGH (3.3 V)
Following checks have to be performed:
•
check fuse (F101)
•
standby check V
STB
•
PFC voltage check (C646), measure 380 - 400 V; if no PFC
applied, measure 311 @ 220 V
•
multi-level check V
•
multi-level check V
•
reference voltage check (U401), measure 5.96 V (appr.).
7.3
General Power Architecture
For the power architecture refer to figure
For start-up steps (for trouble-shooting), refer to figure 7-10.
The start-up sequence is marked with numbers in red.
2013-Apr-05
Circuit Descriptions
PFC
Resonant
converter
Diode
bridge
Figure 7-6 Block diagram 55"
)
in
PFC present: measure 380 V to 400 V
PFC not present: measure ACin × 2
Check the main supply at C203: measure 12.3 V
Check the audio supply at C202: measure 12.3 V
Allow the power supply to start-up a few times
Figure 7-7 Test instructions 55"
(C301), measure 3.3 V
(C203), measure 12.3 V
SSB
(C202), measure 12.3V
SND
7-8
and 7-9.
L6599
PEE3232
FSL106
STBY
First step
Check the fuse (F101)
Check the Standby voltage
at C301: measure 3.3 V
Check the PFC voltage at C646
back to
div. table
8-channel
Boost
linear
driver
OZ9909TN
V
SSB
V
SND
V
STB
Second step
Check the entire block (PC102, V
Check the entire block (V
Check the entire block (V
No turn on
Check the reference voltage of the
LED Driver (U401): measure approximately 5.96 V
6 channel
LED Backlight
19280_101_120503.eps
1205031
, etc.)
CC
, ICs, etc.)
CC
, ICs, etc.)
CC
19283_001_121009.eps
121009
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