Failure Location Flow-Charts - Sanyo CE28FN1-E Service Manual

17. Failure location flow-charts

ERROR_1
Switch on the TV set with PL100
pushed (protect mode disabled)
Check the +8V supply
in pins 12 and 37 of IC400
OK
Check I2C bus path to
pins 7 and 8 of IC400
OK
Replace IC400
Check +B5
NG
in pin 8 IC701
Replace IC701
Are the retrace
No
lines visible?
*Check +B3 at IC500
*R506 is possibly fused
*IC500 is possibly damaged
Check TO478
(Output of IC701)
OK
Probably:
Check the path of
*C425 failure
V_GUARD signal
*IC400 failure
Check the path
of +V_DRIVE and -V_DRIVE
NG
signals in IC400
OK
Replace IC400
ERROR_2
Does it happen quickly
after switch on?
Yes
Check the vertical deflection
path to IC701
OK
Switch on the TV set with PL100
pushed (protect mode disabled)
Adjust G2 just to see the picture
Is the vertical
Yes
size OK?
No
Check TO047
NG
(Ramp generator)
OK
Check B4 in
pin 4 IC701
OK
Open the pins 1 and 2 of
IC701 and check the
+V_DRIVE and -V_DRIVE signals
OK
Replace IC701
12
Service Manual MS CE25FN1-E
ERROR_5
Check +5Vin L1304 (audio PCB)
OK
Check I2C bus path to
pins 4 and 5 of IC1300 (audio PCB)
OK
Check +5V in pins
7, 15, 38, 59 and 64 of IC1300 (audio PCB)
OK
Check the crystal oscillador of IC1300
OK
Replace IC1300
ERROR_6
Check +5VM in pin 8 of IC125
OK
Check I2C bus track continuity
in pins 5 and 6 of IC125
OK
Replace IC125