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Sony Model KZ-32TS1U // KZ-41TS1U TV Diagnostic Guide
Chapter 15 - Normal Operation
Satellite reception shows picture squares
– The compression of satellite conveyed (“Dish”) video signals
results in pictures that show small squares larger than the detail the TV is capable of producing. This problem is
compounded by the DRC circuit, which cannot enhance the picture detail by analyzing the picture’s larger squares
and making improvements.
When high compression is used, the DRC circuit cannot properly analyze the picture. To ensure that the DRC
circuit does not add more noise; the TV menu has a MILD picture mode (i.e. VIVID, STANDARD, MOVIE &
MILD) that bypasses the DRC operation. The MILD mode can be used on any noisy program.
Lamp Life
– Estimated lamp life is about 6000 hours, P/N = XL2000U (A-1601-753-A). The lamp life will be
shortened if the lamp is repeatedly started or run at elevated temperatures.
Lamp Warm Up
– The backlight lamp is similar to a fluorescent tube but has a two level brightness and delay
circuit to prolong life. At turn ON, the lamp gradually increases to the first level of low very brightness. Three
seconds later, a lamp relay (on the lamp board) will click to move to toward the second brightness level. After the
lamp relay clicks, the lamp will take a minute to gradually reach almost full brightness.
Lamp Remains ON
– Although the audio and video is muted immediately at turn OFF, the TV remains on for five
seconds afterwards. During these five seconds, the lamp steps to a lower brightness while the fans continue to
cool. The lamp that remains ON when the TV is muted is only noticeable if the room is dark.
Delayed TV ON
- If the TV is turned OFF and back ON within five seconds before the lamp goes off, the TV will
come back ON (unmute). However, if the TV is turned ON after the lamp has turned OFF, the TV remains audio
and video muted for 30 seconds. This allows time for the lamp to cool off before being turned back on. Turning
a lamp on and off quickly shortens its life.
No Convergence Adjustments
– The positioning of the three colored LCD panels is performed at the factory.
Since there are not three beams to converge, convergence is a matter of positioning the three LCD panels with
minor adjustments at the factory. If there are geometric distortions, check the cabinet for shifted mirror, front lens
and cabinet deformation (weights added to the cabinet) before suspecting the optical unit assembly that contain
the LCD panels.
