Many Sony television owners face the frustration of a suddenly unresponsive screen, and troubleshooting can often lead down a complex path. A recent post on the Italian tech forum PLC Forum details one user’s struggle with a Sony Bravia KDL-32EX600 that completely shuts down, even failing to enter standby mode, accompanied by a clicking relay sound when plugged in. The user, seeking guidance, has begun a detailed diagnostic process, sharing schematics and technical observations that may prove helpful to others experiencing similar issues with their Sony TVs.
The core of the problem, as described in the forum post, centers around the television entering a protection mode after a few minutes of operation. This results in the loss of the Power_ON signal and, the disabling of the 5V power supply. The user had already attempted a factory reset, a common first step in troubleshooting electronic devices, but the issue persisted. This suggests a deeper, hardware-related problem rather than a software glitch. The specific model, the Sony KDL-32EX600, is a 32-inch Bravia HDTV released several years ago, and finding readily available repair services can be challenging, prompting the user to attempt a self-repair.
Diagnosing the Power Issue
To isolate the problem, the user meticulously disconnected all peripherals from the television’s PSI (presumably a power supply interface), leaving only the power cable connected. A 1kΩ resistor was then connected between the STB_3.3V and Power_ON lines, a technique used to simulate a signal and test the power delivery system. This test confirmed the presence of 13V on the REG_12 line, indicating that the initial power regulation stages were functioning. Further testing involved connecting a 15kΩ resistor between STB_3.3V and T-con_ON, which resulted in 2.08V and subsequently restored 5V to the T-con_Vcc_5V pin. This suggests the T-con board, responsible for controlling the display panel, was receiving power after this intervention.
However, the most significant clue emerged during observation of the television’s components. The user noticed that resistor R4402, a 100Ω resistor, was rapidly heating up, exceeding 45°C, before the television shut down. This overheating indicates an excessive current flow through the resistor, suggesting a short circuit or a component drawing too much power in that circuit. Identifying the function of this resistor and the components it’s connected to is crucial for pinpointing the root cause of the problem.
The B_INT/WP Signal and Potential Solutions
The user also expressed uncertainty about the function of the B_INT/WP signal, questioning whether it could be contributing to the issue. Without a clear understanding of this signal’s role, it’s difficult to determine its involvement. The B_INT/WP signal likely relates to the backlight control or protection circuitry within the television, but further investigation is needed to confirm its function. The user is seeking input from the forum community, hoping someone can shed light on this signal and suggest further diagnostic steps.
The user found schematics for the KDL-32EX600 on two websites: eServiceInfo and yoreparo.com. Access to these schematics is essential for tracing the circuit paths and understanding the relationships between components, particularly around the overheating resistor R4402 and the B_INT/WP signal. Sony provides drivers and software updates for the KDL-32EX600 on their support website, Sony USA, though these are unlikely to resolve a hardware fault.
Broader Trends in Sony TV Repair
The PLC Forum itself hosts a dedicated section for Sony televisions, indicating a common need for repair assistance among owners of these devices. A quick review of recent posts reveals several other users experiencing similar issues with Sony Bravia models, including complete power failures and problems with standby mode. For example, a post from August 21, 2025, details a completely unresponsive Sony bravia kdl 32 P 3020. These recurring issues suggest potential design flaws or component failures that affect multiple models and generations of Sony televisions.
Repairing modern televisions can be challenging, even for experienced technicians. The complexity of the circuitry, the difficulty in sourcing replacement parts, and the lack of readily available service manuals often develop professional repairs expensive or impractical. This is driving a growing trend of DIY repairs, with enthusiasts turning to online forums and resources to diagnose and fix their own televisions. However, working with electronic devices involves inherent risks, and it’s essential to exercise caution and follow safety guidelines.
The user’s ongoing investigation into the KDL-32EX600’s power issue highlights the challenges faced by consumers when their electronics fail. The detailed diagnostic steps and the sharing of schematics demonstrate the power of online communities in providing support and knowledge to those attempting self-repair. As the user continues to troubleshoot the problem, further updates and insights are expected from the PLC Forum, potentially offering a solution for others facing similar difficulties with their Sony televisions.
The next step for the user will likely involve tracing the circuit connected to resistor R4402 to identify the faulty component causing the overheating. The forum community’s input on the B_INT/WP signal could also prove crucial in narrowing down the source of the problem. Readers interested in following the progress of this repair can monitor the discussion on the PLC Forum.
Have you experienced similar issues with your Sony television? Share your experiences and troubleshooting tips in the comments below.
Keep reading
