TPD.T950X4.PB793(T) voltage chart скачать в хорошем качестве

TPD.T950X4.PB793(T) voltage chart

TPD.T95OX4.PB793(T) board is not publicly available without a specific service manual. The detailed internal schematics and precise voltage test points are typically restricted to authorized service technicians. However, for a 32-inch Redmi or Mi smart TV using this motherboard, technicians have determined some common voltage measurements. Important warnings: High Voltage: This work involves high-voltage circuits. Only qualified technicians should attempt these repairs. Static Damage: Wear an anti-static wristband to prevent damage to sensitive components from electrostatic discharge (ESD). Confirm Board Version: The exact voltage readings can differ slightly based on the TV model and hardware revisions. Always double-check component references against the specific board. Power Off: Always unplug the TV from the wall and wait for the capacitors to discharge before testing. Typical voltage test points (with power on) A multimeter is required to test these points. All voltage readings are referenced to a good ground point on the chassis. Power supply outputs (at the power supply connector) The main power supply provides several voltage rails to the motherboard. Check the connector that goes from the power board to the main board. Pin Function (Typical) Normal reading Notes Pin 1 Standby voltage (5V) ~5.0V This voltage should be present even when the TV is "off." Pin 2 Ground (GND) 0V Pin 3 Ground (GND) 0V Pin 4 12V rail ~12V Powers the audio amplifier. Pin 5 12V rail ~12V Pin 6 Backlight ON signal 2–5V (High) The voltage is only present when the TV is powered on. Pin 7 LED+ (Backlight) 20–50V The voltage varies depending on the backlight driver circuit. Mainboard voltage regulators (after power-on) These voltages are regulated down from the 5V and 12V rails. You will need to locate the voltage regulator integrated circuits (ICs) and their associated test points on the main board. 1.2V Rail: Supplies the CPU core. Expect to find a reading of around 1.2V at the corresponding IC output pin. 1.5V Rail: Supplies the RAM. You should see a reading of approximately 1.5V. 3.3V Rail: Powers the standby circuitry and other lower-power components. You should find a stable 3.3V at the output. How to diagnose a dead motherboard A common repair for this board involves a dead power symptom where the 5V standby voltage is missing due to a shorted line. Diagnostic steps: Check 5V standby: Unplug the connector from the mainboard and test the 5V standby output directly from the power supply board. If the 5V is present, the mainboard has a short. If it is missing, the fault is on the power supply board. Inspect for shorts: If the 5V standby voltage disappears when the mainboard is reconnected, use a multimeter in continuity mode to check for a short to ground at the 5V input on the mainboard. Locate the shorted component: If a short is detected, visually inspect the board for any burnt components or bulging capacitors. In some cases, applying a low-voltage, high-current power supply to the 5V line and watching for a component that heats up is a valid, though risky, repair technique.