Philips for Intel Socket 775 processor Service Manual page 18

EN 18 5. S/SD/HD 3.1 PDP
No Voltage output
On/Off relay
RLY8001/8002 acts?
Green LED´s
8001, 8002
are on?
Yes
LED on Logic
main board ?
Off
Blinking
Check Power supply
on Logic-Main board.
3,3V and 5V
Data communication
from Philips
application to Logic
mains is OK.
Call SAM
or SDM
Check SMPS outputs
Vs, Va, Vset, Ve, Vsc
see Sticker
If Power supply on Logic
mains is not OK, change PSU
or Logic main board
Diagnostic software
Power Supply Check for 42SDV2
Operating voltages don´t exist V2 Versions
Connect set to mains.
Switch on On/Off switch (vacation switch)
LED8003
Stby is on?
Yes
Switch on via 1 or 2
Check Protection Red
No
SMPS shutsdown?
Red LED8004 is on.
Protection
Disconnect mains cord
Disconnect Y-main CN8008
Reconnect mains. Switch on via 1 or 2
On
SMPS is working?
Continous on, means no
data communication over
LVDS Cable.
Yes
Go to repair scenario
Y-Main board
as stand-alone
Discharge capacitors on Power supply, before
reconnecting X, Y or Logic Buffer board, use
2K4/10W discharge resistor
NO
Stanby supply is defective.
Switch from standby to on;
1 Via RC when Philips application is in.
2 Via Switch on Jig connector when Philips
LED8004
application is removed
Green LED 8001,
& Red LED are off
Yes
No
Disconnect mains cord
Disconnect X-main CN8007
Reconnect mains. Switch on via 1 or 2
SMPS is
working?
Yes
Replace
Replace
X-Main board
Figure 5-5
Check F8002
Fuse 250V/8A
Check CN8004 / 2pin
connector 220V AC
Replace PSU
8002
Check Stanby Line pin 11
on CN8002 must be low.
No switch on of PSU
Go to repair scenario
as stand-alone
No
Disconnect mains
Disconnect VA Logic Buffer
CN8010 / CN8011
Reconnect mains. Switch on via 1 or 2
SMPS is
working?
Yes
Replace defective
Logic Buffer board
No
Replace PSU