Section 2 - Troubleshooting; Overview; Updating The Software; Self Diagnosis Function - Sony KDL-40BX450 Service Training Manual

SECTION 2 - TROUBLESHOOTING

OVERVIEW

This chapter provides information regarding the Self Diagnosis feature in
our TVs.

UPDATING THE SOFTWARE

The Self Diagnosis function is designed to provide information regarding
the problem with the TV, however, there are several issues that may be
resolved by updating the TV software to the latest version. Always check
the Sony Authorized Servicer Portal at
issues that are software related. Most symptoms that are correctable by
software updates involve communications issues with other devices or
minor glitches in the operation of a specific function. Below is a list of some
of the symptoms that may be corrected with a software update:
● Fluctuations in picture brightness
● Intermittent picture freezing or noise
● Problems with certain inputs (especially HDMI)
● Intermittent or distorted audio
● Erratic remote control operation
● TV turns on and off by itself
● Loss of color
● Internet connectivity
● Certain features not working correctly
(photo or video file viewing)
KDL-40BX450/40BX451/46BX450/46BX451
http://www.sony.com/asp for any

SELF DIAGNOSIS FUNCTION

Critical voltages and circuit operations are monitored by the CPU on the
Main Board. If an error is detected the Self Diagnosis function in the TV will
force the TV to shut down by the CPU. The monitored circuit in which the
fault occurred will automatically cause the CPU to blink the Standby LED
in groups of repeating sequences. The number of times the Standby LED
blinks indicates the possible cause of the problem.
Not all of the available protect codes are used in every model. For example,
models that don't have the local dimming feature do not use the 4X blink
error as this circuit is found in models that are backlit with fluorescent lamps.
The information in this section provides guidance in locating the possible
component causing the shutdown.

STANDBY LED BLINK COUNT

Standby LED
LED DISPLAY & BLINK COUNT
Self Diagnosis
2 times
5 times
LED ON 0.3 sec.
LED OFF
LED OFF 0.3 sec.
3 sec.
Supported model
6