Philips BJ3.1E LA Service Manual page 39

Service Modes, Error Codes, and Fault Finding
32" LCD
Power supply start-up behaviour
N
SSB Board defective
Standby command linefrom PNX
BLR Procedure
OK
SSB Start-up process
12V and 5V switched to DC/DC
converters on SSB start up via
Standby processor (PNX)
Protection?
Blinking LED?
Y
If protection blinking LED.
Check if error code is related to
DC/DC converter on SSB
Error code is
from DC/DC ?
Y
switching VDisplay voltage to LVDS
Change SSB
BLR procedure
Power Supply Check
Mains cord is connected
LED is on?
Y
Red LED is on +5V2 is ok.
Standby supply is working
Switch set on via Local keyboard or RC
Standby line goes
low pin 7 1M03
Relay on Display supply is closed
LLC supply starts
+12V, & +8V6 becomes available connector 1M46
+24V (or 295V) for Backlights connector 1319
Voltages on
1M46?
No
No
SSB Start-up process Continue
Viper & I2C commands
connector
In case of short circuit on VDisplay
PS, disconnect LVDS cable
Figure 5-19 Power supply start-up behaviour (for 32" models)
No
Check if vacation switch is closed
+5V2 is OK?
Pin 7 1M46
Y
Check Fuse 1400 & 1401 , on Mains filter supply
Drive circuit 7100 & T 7102
and components in standby supply
Not OK
No start-up of Display supply check
Drive 7001, Mosfet 7005, 7006
Check protection error code = xx xx xx
is 12V or DC protection(Audio)?
Disconnect PS connector to Audio part &
LLC supply
is working?
Y
Check output voltage.
LCD Inverter start up process
from SSB.........
BJ3.1E LA 5.
No
Check Standby supply
Check 25V Hot, 400V Hot
Check LLC Display supply
OVP Latch
If protection blinking LED
backlight inverters. Try again
N
Check OVP Latch
LLC supply components, control
circuit....
Check PS in standalone mode
(disconnect display supply
connectors)
G_15970_032.eps
EN 39
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