Fault Finding And Repair Tips - Philips FJ3.0E Service Manual

5.8

Fault Finding and Repair Tips

Read also paragraph "Error Codes" - "Extra Info".
32" LCD
Power supply start-up behaviour
SSB Board defective
Standby command linefrom PNX
BLR Procedure
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
Change SSB
BLR procedure
Service Modes, Error Codes, and Fault Finding
Power Supply Check
Mains cord is connected
LED is on?
Red LED is on +5V2 is ok.
Standby supply is working
Switch set on via Local keyboard or RC
Standby line goes
N
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
OK
Voltages on
1M46?
No
No
SSB Start-up process Continue
Viper & I2C commands
switching VDisplay voltage to LVDS
connector
In case of short circuit on VDisplay
PS, disconnect LVDS cable
Figure 5-19 First line fault find tree 32" LCD
No
Check if vacation switch is closed
Y
+5V2 is OK?
Pin 7 1M46
Y
Check Fuse 1400 & 1401 , on Mains filter supply
Not OK
LLC supply
is working?
Y
Check output voltage.
LCD Inverter start up process
from SSB.........
FJ3.0E LA
No
Check Standby supply
Drive circuit 7100 & T 7102
and components in standby supply
No start-up of Display supply check
Check 25V Hot, 400V Hot
Check LLC Display supply
Drive 7001, Mosfet 7005, 7006
OVP Latch
If protection blinking LED
Check protection error code = xx xx xx
is 12V or DC protection(Audio)?
Disconnect PS connector to Audio part &
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
5. EN 51
120506