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Position:IcFull.com » IC Electronic information » Category: F

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Fault type rear projection TV Konka BT4301/BT5090 fast repair processes and techniques (b)

In Electronic Infomation Category: F | on April 18,2011

Second, no raster, no sound, power indicator light

1. And fault repair process

Switching power supply and BA6392FP datasheet and the failure description of the normal 5 V power supply, mainly due to the microprocessor control circuit is not working or standby abnormality. If the instant boot normally, then enter standby mode, and BA6392FP price and more action to protect the circuit, the failure of the repair process shown in Figure 2.


Figure 2, no raster, no sound, power indicator light troubleshooting flowchart

2. Maintenance methods and BA6392FP suppliers and techniques As vice

machine is controlled by the standby power circuit of the relay, so it can relay the sound to determine whether the fault site, if the voice relay, indicating normal standby control circuit, or that Standby control circuit anomalies.

Machine uses a two-color power indicator, power indicator so it can change color to judge whether the fault position, with a remote control switch, the power indicator light color, that is normal and that the microprocessor has received remote control signal, or that the microprocessor is not working or does not receive remote control signals.

III, Vice power without voltage output Vice

no voltage output power, indicating that the standby control circuit, power supply or load Vice exception. The troubleshooting process shown in Figure 3.


Figure 3

no voltage output power supply circuit troubleshooting flowchart

Fourth, no raster

1. And fault repair process

The failure was mainly due to scanning circuit, luminance processing circuit, projection tube circuit abnormality. Repair the fault should be recognized before the contrast, brightness is not wrong to minimum. Maintenance process shown in Figure 4.


Figure 4, no raster troubleshooting flowchart

2. Maintenance methods and techniques

(1) field scanning circuit inspection

Confirm the fault is due to abnormal causes field scanning circuit, the first field test of the output circuit N401 , pin input signal is normal: if normal, check the N401 and the power supply circuit; if the input signal is abnormal N401, check N402 (TA1317AN) 21 pin input field sync signal is normal; if normal, check the N402 and its external components 22 to 24 feet; if the input signal abnormalities in 21 feet, check TA1316AN input field sync signal is normal; if normal, Charles TA1316AN; if normal, check the display format conversion board.

(2) line excitation, the line output circuit check

If the N301 (TA1316AN) of the excitation signal output of 26 feet, then the test tube V410 D-line excitation pole without excitation pulse output. If not, see V410 D-pole power supply is normal; absence of voltage, then check C425, VD420, and V410; if the V410s D is very normal output of the excitation pulse, then check the line excitation transformer T402, the line output transistor V409.

(3) Check the video signal processing circuit

Caused by abnormal if TA1316AN no grating (black), the usually character display, and there will be sound.

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