XBR-49/55/65/75X900E
TROUBLE SHOOTING
FLOW
1-2. NO POWER U-COM FAILURE
21
START
(only for AC-ADP model)
Check TYPE_DET
C503 Voltage.
Is the voltage 0V?
Type Detection Circuit problem.
Check TYPE_DET Line (R521, R522, R523).
Check Power supply harness (CN400 #9pin,10pin).
no
yes
Check POWER_ON
R526 or P-on ucom #pin10
Is the voltage >3.0V?
Try AC Off and On after few minutes.
If #pin19 keep Low, change IC401.
If #pin19 goes High few seconds and downs to Low,
Check +12V_MAIN Line (G board or JK board).
no
yes
Check 12V_MON
R446 Voltage.
Is the voltage >2.6V?
Check +12V_MAIN Line
(G board or JK board).
no
yes
(only for AC-ADP model)
Check DC_MON
R439 Voltage.
Is the voltage >1.8V?
Check POWER_MAIN Line
(JK board).
no
yes
yes
Change IC401
no
Check DC_OFF_DET
R448 or P-on ucom #pin3
is >3.0V?
Check P_ON_#1
CL418 or P-on ucom #pin12
is >3.0V?
Change IC401
no
Continue next page…
Check VDD
C506 Voltage.
Is the voltage >3.0V?
Check +3.3V_STBY LIne (C521, CN400 #14pin)
And (only for AC-ADP model)
3.3V_DDCON (IC403)
no
(only for G-board model)
Check TYPE_DET
C503 Voltage.
Is the voltage 2.6±0.2V?
no
yes
yes
Check OPWRSB
R443 Voltage.
Is the voltage 0V?
SOC
Muffin 2
problem
no
yes
Check PGOOD_1
R440 Voltage.
Is the voltage >3.0V?
No POWER - DDCON/LDO
Check 1.0V DDCON (IC604)
And (only for AC-ADP model)
12V DDCON (IC9000 on JK).
no
yes
Type Detection Circuit problem.
Check TYPE_DET Line (R521, R522, R523).
Check Power supply harness (CN400 #9pin,10pin).
yes
To Next Page
Loading...
