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7.2
Power Supply
7.2.1
Power Supply Unit
For 32", 37", and 55" sets, power supply units should be
repaired on component level. Detailed information is given in
sections
7.2.2
and 7.2.3. All other power supplies are a black
box for Service. When any of these power supplies is defective,
a new board must be ordered and the defective one must be
returned, unless the main fuse of the board is broken. Always
replace a defective fuse with one with the correct
specifications! This part is available in the regular market.
Consult the Philips Service web portal for the ordercodes of the
boards.
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 (C644), mea sure 380 - 400 V; if no PF C
applied, measure 311 @ 220 V
•
multi-level check V
•
multi-level check V
•
reference voltage check (U401), measure 5.96 V (appr.).
PFC
Resonant
converter
Diode
bridge
Figure 7-4 Block diagram 32" & 37"
)
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 C206: measure 12.3 V
Allow the power supply to start-up a few times
Figure 7-5 Test instructions 32" & 37"
(C306), measure 3.3 V
(C203), measure 12.3 V
SSB
(C206), measure 12.3V
SND
Circuit Descriptions
SAFETY INSTRUCTION
Replace safety components, indicated by the symbol h, only
by components identical to the original ones. Any other
component substitution (other than original type) may increase
risk of fire or electrical shock hazard.
7.2.2
PLDC-P109B (32" sets) and PLDD-P109A (37" sets)
The output voltages to the chassis are:
•
V
STB
•
V
SSB
•
V
SND
L6599
PEE3232
FSL106
STBY
First step
Check the fuse (F101)
Check the Standby voltage
at C306: measure 3.3 V
Check the PFC voltage at C644
7.2.3
PLDK-P107B (55" sets)
The output voltages to the chassis are:
•
V
STB
•
V
SSB
•
V
SND
back to
div. table
QFU2.1E LA
(+3.3 V; stand-by mode)
(+12.3 V; on-mode)
(+12.3 V; audio circuit).
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
(+3.3 V; stand-by mode)
(+12.3 V; on-mode)
(+12.3 V; audio circuit).
7.
EN 51
6 channel
LED Backlight
19280_101_120503.eps
1205031
, etc.)
CC
, ICs, etc.)
CC
, ICs, etc.)
CC
19280_102_120504.eps
120504
2013-Apr-05
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