AKIRA TV Service Manuals pdf. Circuit board diagrams
AkiraTV circuit board diagrams & schematics diagrams
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CONNECTOR VIEW
SAFETY INSTRUCTIONS
CIRCUIT ADJUSTMENTS.
FAULT FINDING TREES, DIAGRAMS AND OVERVIEWS
VARIOUS PARAMETERS OF INTEGRATED CIRCUIT
THE BUS DATA FOR TMPA8803
ELECTRICAL PARTS LIST
CIRCUIT DIAGRAM
AkiraTV circuit board diagrams & schematics diagrams
Troubleshooting Akira TVs
If the TV does not show any signs of life, then first you need to look into the power supply. First of all, you need to check the integrity of the power plug and make sure that the strap enters the power supply. Believe it or not, this is one of the most common problems in the practice of repairing various household appliances, not just TVs. Then we check and ring the fuse on button, if we see a blown fuse, in no case put a larger one at face value. To check the TV power supply directly, we turn off the load, which is usually the horizontal output stage, and cut a 220 V light bulb to the vacated contacts. Next, we check the input circuits, the mains rectifier, the filter capacitor that stands after the mains rectifier, and the powerful transistor of the power supply. If the lamp does not light up at all, you need to look for a break in the mains rectifier, filter, in the capacitor, which is immediately after the mains rectifier. Often, in the event of a malfunction (breakdown) of the electrolytic capacitor connected after the mains rectifier, the current-limiting resistor or filter choke, as well as the rectifier diodes, burn out. If, when turned on, the lamp replacing the fuse lit up and immediately went out or began to glow faintly, and the lamp connected instead of the sweep circuit lit up, then we can assume that the power supply is working properly, and further adjustment can be made without the lamp. If, however, the lamp connected instead of the scanner does not light up, then you need to look for a malfunction in the power supply. First of all, measure the voltage across the largest capacitor of the power supply (this is usually the capacitor included at the output of the mains rectifier). The voltage across it should be somewhere around 300V. If it is much lower or absent altogether, then the fault must be looked for in the mains rectifier, circuits from the mains to it, as well as in this capacitor itself.
Malfunctions in the circuit of the radio channel and the video path.
Here is such a malfunction - the scan is working, the screen is lit, but there is no image. In this case, the faulty node can be identified as follows. If there is no sound and image, the malfunction should be looked for in the radio channel (tuner, video processor). If there is sound, but there is no image, the malfunction should be looked for in the video amplifier or video processor circuit. If there is an image and there is no sound, it is most likely that the audio amplifier is faulty. Still quite often there are problems with the circuit for connecting external devices - input, output audio and video. Here, after all, various switches are used, and there may be a malfunction in them, or, for example, there may be no sound when receiving television, but there is sound when working with a DVD player. Then the matter may be in the switching circuit or due to a malfunction of the capacitor, through which the audio signal from the output of the radio channel goes to the preliminary ultrasonic frequency converter. After checking the power supply voltage of the radio channel, you need to supply video and audio signals through the low-frequency input (you can use a TV signal generator or DVD player).