Konka new Caiba B / X series TV automatically shut troubleshooting tips |
| Time：2014-04-29 08:45:06 Source：Network Author：Unknown Clicks：1469 |
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Nqnservice manual download site
Nqnservice manual download site
( 2 ) measuring the main switching power supply output voltage B + . If the automatic shutdown, the main switching power supply remains stable normal voltage should focus on checking line scan circuit , if the main switching power supply output voltage is increased , reduced or zero, the protection circuit should focus on checking the power circuit.Nqnservice manual download site
Nqnservice manual download site
(3) V404 -collector voltage is measured ( approximately +100 V). If not, should focus on checking incentives start circuit (R413, R405, C403, V404), and a special control circuit and control circuit protection .Nqnservice manual download site
Nqnservice manual download site
( 4 ) measuring V403 emitter voltage ( about -5.6V). If not, should focus on checking negative driver circuit (R413, VD403, C405) and the regulator control loop .Nqnservice manual download site
Nqnservice manual download site
( 5 ) Measurement of the auxiliary switch power supply output voltage ( approximately +9.5 V), the microprocessor supply voltage (+5 V) and the reset voltage. If not, should focus on checking deputy switching power supply and microprocessor associated circuitry.Nqnservice manual download site
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