Author£ºUnknown
Source£ºNetwork
2015-07-25 09:36:40
Core tips£ºSubstitution method Sony KV-T29MF1 TV tuner
Movement of BG1S Sony KVT29MF1 color TV sets belongs to. The machine adopts BTAG401 tuner, the damage is not easy to buy and the price is expensive. But by added some circuit, available TDQ3 type tuner for substitution. The original machine tuner and TDQ - 3 tuner work conditions are quite different, as shown in Figure 1, the working voltage is 9V U / V, LREE for band switching voltage combination. In order to meet the TDQ3 type tuner working conditions, to increase the circuit shown in figure 2. When foot of CPU{59}, (60) respectively, the output of high and low (60) {59}, (60) high and low in the {59}, {59} high (60) high voltage combination, VL and VH, u respectively output corresponding with the voltage of 12V, in line with the TDQ3 tuner of each band.
First, the concrete reform methods: due to the original machine tuner working voltage is 9V. Thus, it is necessary from the machine power supply (20V) after 7812 three terminal voltage supply tuner working voltage and frequency band switching circuit. Remove the original engine tuner (than substitution with tuner smaller), only if pin, tuner shielded enclosures for the foot can correspond to the original printing plate. After welding, the remaining terminals such as BM (+ 12), VT (tuning voltage), VL, VH, U, AGC with hard wire and the original printed board and increase the circuit board corresponding connection. Since there is no TUNER AFC terminal, so the other two 33K resistor in series, is connected between the + 12V and, from the intermediate tap welding to the TDQ - 3 type TUNER AFC terminal, fixed to substitution tuner, the increase of circuit board nearby fixed.
Two, image adjustment; after the replacement, the view is like quality can be fine tuned AGC. This machine uses I2C bus control, adjust the AGC to enter the maintenance mode, can be operated in the following order:
Standby mode, press "DISPLAY" to "5", "VOL" (+) > > enter maintenance mode according to "POWER". With remote control "1" and "4" button to adjust project ODAGC with "3" and "6" key adjustment or / drop data, choose the best, the mute button written and "0" button to implement write. Finally, press "power" button to exit maintenance mode. Through the above changes, the adjustment, the machine will be normal work.