Hitachi 42PD9500TA Plasma TV.
Symptom : High frequency buzz from PS
3 diodes found shorted , replaced, buzz persists.
TV worked fine otherwise from start.
Fault traced to this 8 pin dip smd IC with these no.s printed on it;
2A06810
5522 (MOTOROLA SYMBOL)
No prefix before 5522.
I plucked out this IC from another working 50" Hitachi plasma to
confirm fault.
The no.printed on the working IC is;
2A06905
5522 (MOTOROLA SYMBOL)
Since the IC worked flawlessly on replacement i'm guessing the actual
no. is 5522.
The IC seems to be some kind of pwm controller, it feeds the Mosfets
which drive the serial output transformer, and receives inputs from
feedback winding on the primary side of the SRT and from the
optocouplers.
The Motorola semiconductor site provides no info, maybe this is
supplied OE to Murata who supplies it's PS OE to Hitachi. Again , no
schematic for the PS in the Hitachi service manual.They love us so
much they want us to replace the entire board.
Any idea what the prefix might be and where i can find a datasheet for
the device?
Jango