O Philips AH621 Voltou! O defeito que engana até o testador de componentes.

Our friend Luís Carlos Ladislau's Philips AH621 is back on the workbench! 🛠️ They say the prodigal son always returns home, and this 1983 receiver seems to have really enjoyed the workshop. After all the saga we went through with it (recap, replacement of an imported potentiometer, and battle against counterfeit transistors), it returned with a new challenge: the AM/FM radio stopped tuning. In this video, I show the entire diagnostic process: ✅ Using the TDA 1220 IC datasheet for voltage measurement. ✅ How to interpret the schematic when the service manual is limited. ✅ The danger of components that "seem" good on the tester but fail in the circuit. If you like hardcore electronics, diagnosing real faults, and devices that marked an era, this video is for you! 📺 REVIEW THE COMPLETE PHILIPS AH621 SAGA: To understand everything that has been done on this device, watch the previous videos: 1️⃣ The beginning of everything:    • Receiver Philips AH-621   2️⃣ The potentiometer saga:    • Receiver Philips e a saga de um potenciôme...   3️⃣ Maintenance challenges:    • Receiver Philips AH-621 (Parte 3)   4️⃣ Tests and components:    • Receiver Philips AH-621 (Final)   5️⃣ The delivery (the first time):    • Como ficou o receiver Philips AH-621.   📢 Don't forget to: 👍 Leave your LIKE if the video helped you or It entertained. 💬 Comment where you're watching from (who knows, you might get a "shout-out" in the next video!). 🔔 Subscribe to the channel and turn on notifications so you don't miss any restorations. #PhilipsAH621 #VintageAudio #Electronics #Restoration #PhilipsReceiver #VintageSound #ElectronicMaintenance