Philips for Intel Socket 775 processor Service Manual page 19

No Voltage output
Operating voltages don´t exist V3 Versions
On/Off relay
RLY8001/8002 acts?
Green LED´s
8001, 8002
are on?
Yes
LEDs 3,3V and 5V
on Logic main board?
Off
Check Power
On
supply on Logic-
Main board..
Data LED on
Logic Main ?
Continous on, means no
data communication over
Blinking
Data communication from
Philips application to Logic
mains is OK.
Call SAM
or SDM
as stand-alone
Check SMPS outputs
Vs, Va, Vset, Ve, Vsc
see Sticker
Power Supply Check for SDV3
Connect set to mains.
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 CN8003
Reconnect mains. Switch on via 1 or 2
SMPS is
working?
On
LVDS Cable.
Yes
Replace
Y-Main board
Go to repair
scenario
Discharge capacitors on Power supply,
before reconnecting X, Y or Logic Buffer
board, use 2K4/10W discharge resistor
Diagnostic software
Check Fuse F800 / F8002 / F8003
NO
LED8004 Switch from standby to on;
1 Via RC when Philips application is in.
2 Via Switch on Jig connector when Philips
application is removed
& Red LED are off
Yes
No
Disconnect mains cord
Disconnect X-main CN8002
Reconnect mains. Switch on via 1 or 2
SMPS is
working?
Yes
Replace
X-Main board
Figure 5-6
S/SD/HD 3.1 PDP 5.
Check CN8001 / 2pin connector 220V AC
Stanby supply is defective.
Replace PSU
Green LED 8001,
8002
Check Stanby Line pin 13
on CN8004 must be low.
No switch on of PSU
Go to repair scenario
as stand-alone
No
Disconnect mains
Disconnect VA Logic Buffer
CN8005 / CN800x
Reconnect mains. Switch on 1 or 2
SMPS is
working?
Yes
Replace defective
Replace PSU
Logic Buffer board
EN 19
No