Sanyo CE29FFV2-F Service Manual page 25

Put a jumper between B-E of Q850 (N.1)
In models with Active 3D Surround: Check +9V
In models without Active 3D Surround:Skip this step
* Check the B_HIGH signal and his path until Q850
* Check the pull-up of the pin 52 of IC100
Check with the oscilloscope that the rise time of B1 in the stand-by
to "ON" sequence is less than 160 ms (without the jumper in Q850)
Check that the rise time of +8V is less than 20 ms
Check Q856 and its components at the base
N.1: Once the power supply is repaired, remove the jumper. Without it, the deflection does not start
N.2: Consider in this situation that the +8V source could be at 7,5 volts
ERROR_4
Check +B4
NG
(cathode of D852)
OK
OK
Check +8V
NG
(N.2)
OK
Q853, Q854 and Q856.
Check +5V
NG
OK
Check D875 and R869
OK
OK
NG
Check the rectifier
OK
diodes
Is the voltage level
at pin 4 of IC853
Yes
greater than 2V?
No
Check the path of
Is the voltage level
at pin 4 of IC854
Yes
greater than 2V?
No
NG
Check C809 and B8 source
14
Service Manual MS CE25FV2-E
Probably:
* IC701failure
* Shortcircuit or over consumptiom
* IC850 does not work OK
Probably:
*There is not +B6 at IC853
*Shortcircuit in +8V
*IC853 failure
Probably:
*There is not +B7at IC854
*Shortcircuit in +5V
*IC854 failure