Video Failures, No Video | Sony KDL22EX308, KDL32EX308 specs

Chapter 3 - Troubleshooting

Video Failures

Problems that develop in the video circuits can appear as subtle or major distortions, a loss of one or more colors, improper video level, or a complete loss of video. When troubleshooting LCD display devices the problem must be isolated to 3 major components: The main board where the video processing is performed, the TCON board, or the LCD panel. In some cases the TCON may not be available as a separate component and replacement of the LCD panel is required to rectify a TCON problem.

Distortion in the video signal that affects all inputs can be challenging at times since any of the above mentioned components can cause this. Fortunately, each of these components tends to generate unique symptoms when a problem occurs. Some distortions may occur that could be caused by either of these components but a good understanding of the circuits and further investigation will isolate the suspected circuit. The following sections will cover the various scenarios of problems that may occur in the video processing circuits.

No Video

A “no video” complaint can be caused by a number of reasons. The ﬁrst step is to determine if the condition is present from all input sources. If any video source is working properly, the TCON can be assumed to be OK. The backlights are also functioning properly. Although it is unusual for a backlight failure to cause a complete loss of video (the unit will shut down if a backlight power or open LED is detected) there have been cases where the backlights have failed to turn on without the unit shutting down.

If the loss of video occurs on all inputs, the problem will require additional diagnostic work. The presence of audio is an important sign to check for. Missing audio accompanying a loss of video helps to eliminate the TCON as the cause and would point to the BAL board as the culprit. If audio is present, the next step is to determine if the video loss is occurring in the video process circuits on the BAL board or the LVDS cable link from the BAL board to the TCON, or the TCON itself.

Service Tip: If a service call is made for a “no video” complaint, a warranty repair would require the technician to bring a BAL board to the location. The technician will install the board (hopefully the correct one) and if the video problem is not remedied, it is safe to assume the problem might reside in the TCON.

One method to test a TCON, which works rather well in most cases, is to remove the LVDS connector at the LCD panel (the TCON board is internal to this panel) while the unit is running. Be certain to release the lock tabs and handle the connector carefully to avoid damage.

Carefully insert and remove the connector while slightly rocking it. Observe the screen as you do this. If any activity appears on the screen (ﬂashes, lines or patterns) The TCON is OK. The unit may shut down within a 10 to 20 second period because the protect circuits have detected a TCON failure. If this happens, simply re-insert the LVDS connector, turn the unit back on, and try the procedure again. Normally, you should be able to detect something on the screen within a matter of seconds.

The troubleshooting ﬂowchart in Figure 3-2 should provide assistance in isolating the cause of the video loss.

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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.