Sony X930E Series Service Manual page 25

FLOW
1-3. NO POWER DDCON/LDO
DDCONs CHECK
START
Check fuse no
F4xx / F40xx/F6xx
Is fuse OK?
yes
Check Vcc voltage no
C4xx / C40xx/C6xx
Is voltage >12.0V?
yes
Check Enable pin no
voltage
Is voltage >2.5V?
yes
Change DDCON IC
XBR-55/65X930E, 75X940E
Change Fuse
1) Check POWER_ON P-on ucom #pin10
(Refer to No Power U-Com Failure)
2) Check G* board
3) Check IC9000 on JK* (only AC-ADP Models)
No Power U-Com Failure
or
Enable source
IC Ref Voltage supply
IC402 +5.0V_VBUS/+5V_MAIN
+3.3V_STBY
(AC-ADP only)
IC403
/+3.3V_MAIN
Q407 +3.3V_MAIN
IC405 +1.8V_TU
IC601 +1.5V_DDR
IC604 +1.0V_M2
IC4001 +1.5V_BE
IC4002 +1.1V_BE
IC4003 +1.0V_BE
LDOs CHECK
START
Check Vcc voltage no
C4xxx or C6xx
Is voltage >3V?
yes
Check Enable pin no
voltage
Is voltage >3V?
yes
Change LDO IC
TROUBLE SHOOTING
Check +3.3V_DDC_OUT
DDCON (IC403)
or
+3.3V_STBY (G* board)
No Power U-Com Failure
or
Enable source
IC Ref Voltage supply
IC602 +1.05V_M2_STBY
IC603 +1.05V_M2_A_1
IC605 +1.05V_M2_ST_ET
IC606 +1.05V_M2_A_2
IC607 VCC3IO_EMMC (1.8V)
IC4004 +1.8V_BE
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