How to make a TV out of a monitor. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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How to make a TV out of a monitor. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Computers

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Many who started their acquaintance with computers from the ZX-SPECTRUM family, BK-001, etc., have a color monitor of the 32VTTS-202 type (MS 6113.02) or similar. If this monitor is no longer used for its intended purpose, then the proposed revision of the circuit allows you to turn it into a modern TV with an IR remote control. To do this, you will need to install some of the missing nodes to the blocks already available in the monitor: a color module, a radio channel and a control unit. It is better to buy them ready-made. These nodes are unified and are easily installed inside the case on a metal frame (gate). This will not require large material costs and a lot of time. The video channel board and control unit present in the monitor must be removed (they are not used further). And for the convenience of mounting new boards, the power supply filter and the power supply itself are moved deeper into the base of the case. The block diagram of the electrical connections of the nodes is shown in the first figure. On it, new blocks that are installed in the case are shown in dotted lines. The figure only shows the connections being made between the units, in addition to the existing installation.

When finalizing the monitor scheme, new nodes were applied:

radio channel block BRK-3-32 (from TV Ts-415);
MC-31 color module (suitable for any modification);
MSN-405 control module with BPD-45 unit, as well as an IR remote control;
speaker type 0.5GD-36 (there are already mounting holes for it on the front panel of the monitor).

The location of the blocks on the frame inside the case is shown in the second figure (rear view). The radio channel block is installed at the bottom of the left gate. A color module is fixed in the upper part of the same gate. The power supply is located vertically on its own bracket, with the output connector up. In this case, the MSN-405 module is used as a control unit together with the standby mode unit BPD-45. The MCH-405 module is installed in place of the removed control unit using a metal bracket. At the place of its installation on the front side of the TV case, a hole is cut for the indicator and controls. The standby mode block and the PFP are installed on the base at the bottom of the TV case in the place vacated after the PSU was moved. The speaker is mounted on the right bottom of the case on the existing seat using self-tapping screws. The blocks and modules are connected with a bundle, the laying of which is better to start from the power source to the required places.

For the normal operation of the TV on the MGSR board located on the line scan module, it will be necessary to complete the revision. It consists in installing the KT315 transistor in an open circuit from the XP1 / 13 connector (there is a place for placing these elements on the board). This ensures that the signal is inverted, which is necessary for the normal synchronization of the generator inside the microcircuit. You will also need to install additional resistors R1 and R2 on the scanner board (first figure). They are used later to adjust the voltage.

(click to enlarge)

When setting up the TV, its complex adjustment will be required. To do this, you need to imagine the principle of operation of the nodes included in it and have electrical circuits of all blocks. The volume of the book does not allow describing this process in detail. For example, you can recommend getting acquainted with the book "Adjustment and Repair of Color TVs", by S. A. Elyashkevich, or similar. In particular, during the adjustment process, operations are performed in the following sequence: Check the presence of nominal voltages at the output of the power source. Set the voltage to about 30 V on the kinescope modulator (resistor R1 on the scanner, see the first figure). Using the MCH unit, set the TV to any received television signal in accordance with the operating instructions for the Horizon 51CTV-441 TV. For normal sound adjustment, it will be necessary to replace the R405 resistor in the MSN-34 module with a nominal value of 1 kOhm, and by selecting the R7 resistor (from the BRK-3-32 radio channel unit), the minimum volume level is adjusted.

We set the maximum volume by adjusting the resistor R28 on the radio channel block. After receiving the image on the screen, the color module (MC-31) is configured. The complex adjustment of the TV is carried out in accordance with the recommendations set out in the literature. It should only be borne in mind that the output stage will be powered by a reduced voltage (180 V). The last stage of tuning is the elimination of geometric distortions and the centering of the raster using the appropriate controls on the boards of the scanner. In case of unstable synchronization, it is regulated by standard elements on the MKR and MGSR, respectively. In the referenced literature, the tuning technique is described in more detail, but the composition of this TV must be taken into account.

Publication: cxem.net

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