Sony GN3TR - Ddcons CHECK; Ldos CHECK

XBR-49/55/65/75X900E
TROUBLE SHOOTING
FLOW
1-3. NO POWER DDCON/LDO
DDCONs CHECK
25
Check Enable pin
voltage
Is voltage >2.5V?
No Power U-Com Failure
or
Enable source
Change Fuse
no
no
START
yes
Change DDCON IC
Check fuse
F4xx or F6xx
Is fuse OK?
Check Vcc voltage
C4xx or C6xx
Is voltage >12.0V?
1) Check POWER_ON P-on ucom #pin10
(Refer No Power U-Com Failure)
2) Check G* board
3) Check IC9000 on JK* (only AC-ADP Models)
no
yes
yes
IC Ref Voltage supply
IC402 +5.0V_VBUS/+5V_MAIN
IC403
+3.3V_STBY
(AC-ADP only)
/+3.3V_MAIN
IC405 +1.8V_TU/+1.8V_BE
IC404 +1.0V_BE
IC409 +1.5V_FRC
IC410 +0.95V_FRC
IC604 +1.0V_M2
Check Enable pin
voltage
Is voltage >3V?
No Power U-Com Failure
or
Enable source
no
START
yes
Change LDO IC
Check Vcc voltage
C6xx
Is voltage >3V?
Check +3.3V_DDC_OUT
DDCON (IC403)
or
+3.3V_STBY (G* board)
no
yes
LDOs CHECK
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)