Sony KDL22EX308, KDL32EX308 manual Backlight Issues, Diagnostics History, No Backlight, No Shutdown

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Chapter 3 - Troubleshooting

Backlight Issues

Under normal circumstances, any failures in the backlighting system will cause the unit to shut down. If one or more of the fluorescent backlights fails to turn on, or if the high voltage inverter circuit fails to turn on, the unit will shut down and the standby LED will blink in groups of 6.

The first step to determine the cause of the failure is to observe the screen of the television when it is first turned on. If the backlights turn on before the shutdown, it is likely that one of the lamps has failed to turn on and the LCD panel must be replaced.

If the backlights do not turn on, the high voltage inverter did not start and, depending on the method of generating high voltage, replacement of the power supply or inverter board is necessary.

No Backlight, No Shutdown

It is possible for a symptom of no backlighting to occur that does not cause the television to go into protective shutdown. Dynamic dimming control of the backlights is performed by monitoring information from the TCON board. This is in the form of data and determines the brightness level of the backlights based on video content.

If the TCON fails to process the RGB video data, or if the dimmer data line fails, the backlights will not turn on. Audio will be present if the selected input has it available. The television will remain on indefinitely with the green Power LED lit. If the TCON is available, it can be replaced to resolve the issue. If not, the LCD panel must be replaced.

Diagnostics History

Figure 3-6 illustrates an example of the diagnostics history page. Entry to this page is achieved while the television is powered down and pressing the following buttons on the remote commander: “DISPLAY”, “5”, “VOL –“, “POWER”.

This feature is useful for failures which are intermittent or when the customer is not sure what is causing the television to shut down sometimes. Once a corrective action is determined the error events should be cleared to zero. This is accomplished by pressing the “8” key followed by the “0” key on the remote commander.

EVENT COUNT

NOT USED

NOT USED

NOT USED

NOT USED

ERROR BLINK COUNT

OPERATING

HOURS

FIGURE 3-6

DIAGNOSTICS HISTORY PAGE

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Contents Training Manual Table of Contents Introduction Overview FeaturesHdmi USB2.0 Side InputBravia Sync Advanced Contrast Enhancer ACEBAL Board Overall Circuit DescriptionSwitch Unit Power SupplyInverter HLR Board22EX308 Overall Block Diagram 32EX308 Overall Block Diagram Introduction Software UpdatesSoftware Update Responsibility Examples of Software Correctable SymptomsChecking the Software Version Troubleshooting No Video Video FailuresNo Video Video DistortionTroubleshooting Video Distortion Troubleshooting Flowchart Power Supply Troubleshooting Audio TroubleshootingWon’t Power On Completely Dead SetNo Power Troubleshooting Flowchart Protection Shutdown Protect Shutdown Troubleshooting Flowchart Backlight Issues Diagnostics HistoryNo Backlight, No Shutdown Test Points Circuit Board and Connector LocationsKDL22EX308 Test Points KDL32EX308 Test Points KDL22EX308 Board Locations KDL32BX300 Board Locations LCD Panel Basics Tcon Troubleshooting IntroductionAppendix Typical LCD Timing Control Diagnosing a Failed Tcon Gate DriversSource Drivers Typical LCD Panel Failures Tcon Failures Troubleshooting a Dead TconLCD Timing Control Failures Examples of Actual Tcon Failures Appendix LCD Panel Failures Appendix San Diego, CA

KDL22EX308, KDL32EX308 specifications

The Sony KDL22EX308 and KDL32EX308 televisions are part of Sony's Ex Series, renowned for delivering high-quality viewing experiences in compact screen sizes. Designed primarily for smaller spaces, such as bedrooms, kitchens, or dormitories, these models effectively boast an array of features that enhance their usability and performance.

One of the standout characteristics of both models is their LED backlighting technology, which ensures bright images and remarkable color accuracy. This technology also contributes to energy efficiency, making them eco-friendly choices for consumers. The KDL22EX308 comes with a 22-inch display, while the KDL32EX308 offers a larger 32-inch screen, appealing to users who need a bit more screen real estate without major compromises on space.

Both models support a 720p HD resolution, which provides crisp and clear images perfect for everyday viewing. They incorporate Sony’s Motionflow XR technology, which minimizes motion blur during fast-paced scenes, making them ideal for watching sports, action films, or playing video games. This feature enhances the overall viewing experience by ensuring that moving images remain smooth and fluid.

Connectivity also plays a significant role in the usability of the KDL22EX308 and KDL32EX308 televisions. They come equipped with multiple HDMI inputs that allow users to connect various devices such as gaming consoles, Blu-ray players, and streaming boxes with ease. Additionally, a USB port permits users to view photos and videos directly from a USB stick, adding to their versatility.

Furthermore, both models incorporate a built-in digital tuner, enabling access to free over-the-air HD broadcasts. This feature allows viewers to enjoy a variety of channels without the need for a cable subscription, making it a cost-effective entertainment solution.

Another significant aspect of these models is Sony's Clear Resolution Enhancer technology, which enhances image clarity by upscaling lower resolution content, thus delivering a more enjoyable viewing experience across various media.

In conclusion, the Sony KDL22EX308 and KDL32EX308 televisions combine advanced technologies and features within compact designs, making them excellent choices for anyone seeking high-quality visual performance in smaller spaces. Their efficient connectivity options, superior image quality, and energy-saving capabilities position them as modern and practical entertainment solutions.
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