Author: Yang Wei Liu Yiheng
With the vintage 14-inch TV, the design of the design tube and the commercially available repairs are combined with a set of satellite to receive TV two-machine.
First, assemble TV spent 140 yuan to buy a set of 14-inch kits, but also a 100 yuan digital satellite receiver. Install the removed developing tube to the newly purchased kit, connect the degaussing coil, the row, put the circuit board to the casing, plug the CPU control line and the imaging tube and high voltage line, turn on the power supply, the image tube Normal, adjust the focus potentiometer, transfer the snowflake point to the minimum, then enter the adjustment menu system with the remote control, carry out the TV white balance, frame linearity and linear adjustment, to exit the menu, access cable TV, The automatic search program is all received, which proves that the TV is all normal.
Second, the installed satellite receiver uses the unique ZY-2250D small alien satellite receiver, the unit is fast, the image is clear, the threshold is low, and only one set of 18V power supply, power supply and host are separated, The power supply design output current is 1000mA, and if the power is not used, it is convenient to use DC. The front panel is the power switch, there is 3 digits in the middle, and there are five function keys on the right, even if the remote control can be operated. After the power-on, the main menu is only four, and after entering the 305518 password with the remote control, the main menu can become five, which is "System Settings", "Forwarder Settings", "Program Editing", "Game" and "" Automatically search ", when the star is displayed on the second" forwarder setting ", press the" Confirm "button on the remote control to enter the second floor menu" New Repector "," Edit Forwarder "," Delete the forwarder "three items, after" New Repector "with the optical selection, you can enter the third layer menu, you can make local oscillation, downlink frequency, code rate, polarization, and four cut-in-one intermediate frequency on this menu. The parameters such as the switch are modified, and two analog information bars, signal strength, and signal quality appear below the menu, which is based on this information, which is very convenient.
Third, the receiver is loaded into the television machine to open the receiver, with the internal circuit board and front panel, the receiver's movement volume is 0.2cm × 6cm, the front panel is 21.5cm × 3cm, the front panel and the movement Use a cable connection. In order not to damage the receiver performance and the appearance of the TV, the author took the remote receiving head (U3) from the front panel, and the receiver circuit and panel found a suitable location inside the TV, connected @@@@@ @@@@@@@@@@@@@@@Ade once I was connected to the motherboard, and the other soldered on the connector that was removed from the cable TV distributor, installed on the back shell of the TV, so @@@@@@@@@@@@@@@@@ @@@ can be connected from the TV, the receiving head is installed on the front panel of the TV. It is safe in front of the speaker. It uses AB glue, the cable is separated from the hard drive in the old computer chassis, and the optical drive line is separated. 3, solder Go to the receiving head and receiver panel. Because the receiver is a single power supply, it is very inconvenient to put the original power supply in the inside, so it does not have the original power supply, according to the power supply principle, the voltage supplied to the TV is 17V, just consistent with the receiver power supply. On the motherboard, the power supply current resistor R562 supplied to the sound is directly sold. Directly welded to the upper surface, and then the receiver motherboard will save the receiver power supply. The current is 200mA when the machine is not loaded. Switch, C-band vertical polarization current is 350mA, horizontal polarization current is 355mA, so although the television load is added, it does not affect the normal operation of the TV, and there is a certain amount when designing power). There is actually only 6W power.
Fourth, the connection video head This TV video input is only all the way, but the outer interface is two roads, and the back is all the way, the left side is all the way, and the interior is used in parallel, so the video line of the satellite receiver belt is inserted in the receiver motherboard. On the video and audio output, the other with scissors cut away the lotus head, soldered inside the video and audio plug on the left side of the TV, does not affect the appearance of the TV, after connecting, load the back cover of the TV, one It has been made of Taiwan satellite TV reception.
After this modification, the original function of the TV is unchanged. If you want to connect an external view drill, when the video recorder, simply use the remote control to turn the receiver power source, just displayed on the TV, but not influential impact. If you want to watch a normal TV show, switch to the TV state with a TV remote control. If you need to go to the stars outdoor, just take a receiver remote control, take the city to the roof, the TV is open to the AV status, open the receiver information key, and the search content is clear.
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