This part is a kind of semiconductor called LA7837.

Function of this product has Vertical Deflection Circuit with TV / CRT Display Drive.

Manufacturers : Sanyo

Image and pinout :

Some of the text within the PDF file :

Ordering number:ENN3313C Monolithic Linear IC LA7837, 7838 Vertical Deflection Circuit with TV/CRT Display Drive Overview The LA7837, 7838 are vertical deflection output ICs developed for use in high-grade TVs and displays. The interlace and crossover distortion responses, in particular, have been greatly improved, allowing excellent picture quality on large size televisions and high precision interlace mode displays. Also, pulse signals can be used for input signals due to the on-chip sawtooth wave generating circuit and driver circuit. Further, the DC and AC feedback circuit can be formed with these ICs alone, simplifying pattern design of sets and ensuring stable performance. All of the functions in a color TV signal system can be processed by connecting these ICs [ ... ]

LA7837 PDF Datasheet Download