Troubleshooting Flow Chart - Hitachi 46F510 Service Manual

1. NO RASTER AND NO POWER (How to check LED's Diagnosis)
(Signal PWB)
Is Voltage
at pin(16) of I001
3.3V?
NO
YES
(Signal PWB)
Is Voltage
at pin(59) of I001
"H"?
YES
Check
Q027, Q028,
PPS3, Q902
S901
etc.
Check
I009, I001
Check
I501 pin(37)
-H out,
I503 pin(31)
NO
-DEF Hvcc
etc.
Check
T702, R748,
NO
R730
etc.
TABLE OF CONTENTS
TROUBLE SHOOTING FLOWCHART
No
Raster
NO
(Signal PWB)
Is Voltage
at pin(7) of I001
NO
"AC CLOCK in"?
YES
Check
I001
ON
Check
E907,
etc.
(Power Supply PWB)
Check
D911, R906,
NO
R907, C911
(Power Supply PWB)
Check
I901, D901,
NO
R902
(Deflection PWB)
Is base Voltage
Of Q709 normal?
Check
YES
(Deflection PWB)
Are Voltages
At both ends of T702
(primary side)
normal?
Check
YES
Check
Q777, QH01,
T701, TH01
etc.
(Power Supply PWB)
Is Power LED
NO
(D913,Green)
"ON"?
YES
(Power Supply PWB)
Is click sound
of Relay(S901)
heard?
Check
YES U901, D902,
etc.
NO
Check
Q001, Q002,
I902, D906
etc.
(Power Supply PWB)
Does Red LED
(D912) "ON","BLINK"
BLINK
or "OFF"?
1. Turn OFF the power SW.
OFF 2. Wait for 3 seconds.
3. Turn ON again after several
seconds,and observe
green LEDs carefully.
Is Voltage at
pin(4) of I901
14V-20V?
YES
Are 4 Green LEDs
turned OFF at the
same time?
Has Fuse F903
blown?
YES
Does raster
Appear with (6) and (5)
NO
Of PPD4 shorted?
I901, D911,
Check
D910, R908,
R909, R910
Q903, Q904,
R911
Replace F903
Check
SW+115V line SW+28V line
E907, D932, E904, D922,
D925, Q777, etc.
QH01, Q701,
TH01, T701
etc.
69
PWB connecter
(PPS5) open.
(Power Supply PWB)
Is Power LED
NO
(D913,Green)
"ON"?
YES
Check
SBY+5V line
I009, I001,
etc.
(Power Supply PWB)
NO
YES
(Power Supply PWB)
Find LED(s) that is
Turned dark or OFF
YES
Earlier than the others.
etc.
Check Check
SW+5.5V line Audio line
D955, I905, D956, E901,
etc. D915, IAA1,
etc.
DP33KA/B