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Audio equipment

Samsung max dx79 does not turn on

gustavo ortiz fuentez
hace 5 años
hace 5 años
Samsung max dx79 does not turn on, sometimes the front LEDs flash and the red standby LED flashes as if the power was distorting and tried to find the service manual but it was unsuccessful. if you could help me in orienting a little about what points to check
jomi
jomi
38.143
hace 5 años
hace 5 años
Measure at the source's output connectors and tell us what values you find Go diagram MAX - DX75_DX76_DX79 diagram Fuente.pdf [190.64kb]
gustavo ortiz fuentez
hace 5 años

the values found are in cn3 vp21.6, vfd- 34.4, vfd + 21.2, gnd is fine, + 5.6v 1.9, p / on31.8 and in others the vokltage is zero.
in cn2 there is no voltage, it seems that the transformers are not working in the primary seems to be all right, in the transformers I get 342volts as in the b817 and here my problem already check the diodes and they are stable just like the transistors and I just need to check the capacitors, they will know of causality what is the voltage that must reach the transformers in the primary stage since I think that can be the detail.

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gustavo ortiz fuentez
hace 5 años

good day I am still looking for the solution of the problem, I commented that the 731 fan in the icm2 has changed since it evaded me voltage it decreased from 342 to 289 and 320 when making this change I appeared power sense and power one now I just need the power of the area sprayed in the 34.5 volts exactly to take out the volts where the diode d41 (fr104) is located since it reaches voltage but it does not go from there it stays there is static and that part limits me the power for the start of the equipment

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gustavo ortiz fuentez
hace 5 años
hace 5 años
It solves I changed the 431a fan transistor that seemed fine but did not work properly and the ic dm 0365r lowered the voltage that Val to the dm03 diode and for that reason did not turn on many thanks for the support and the happy and happy new year diagram.
jomi
jomi
38.143
hace 5 años

Congratulations on the repair
HAPPY YEAR 2018 !!!!!

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