Sony STR-DE945 Receiver Logo

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Posted on Aug 24, 2010
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My str de 945 will not power up when i hit the power button

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  • Expert 144 Answers
  • Posted on Aug 24, 2010
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Most often that is caused by a failure in the power supply or one output channel. Try disconnecting all the speakers and see if it will power up (relay click) without them. If it does they you have poor connections at the back or the receiver or the speakers. Possibly a failed speaker. If the unit powers up then add one speaker back at a time and repeat the start up. Make sure that no bare wires are touching each other anywhere. If that doesn't solve the problem or if it won't start up with no speakers then it's a trip to the repair shop time.

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Hello Terence, for what you are saying, that you have 12.6 volts in leg 4 (Supply) of STR G6551, according to the data sheet, it is low, it starts working from 14.4 volts, typical 16 volts and maximum 17, 6 volts
you would have to check the values of the power resistances of leg 4, also the capacitors and the optocoupler
I send you link to the JVC THS 55 DVD service manual and the STR G6551 data sheet
I hope you manage to make your JVC THS 55 DVD work
Greetings Franco Dosil

Hola Terence, por lo que comentas, que tienes 12,6 volts en la pata 4 (Supply) del STR G6551, seg?n la hoja de datos, es bajo, arranca a trabajar desde los 14,4 volts, t?pico 16 volts y m?ximo 17,6 volts
Tendr?as que revisar los valores de las resistencias de alimentaci?n de la pata 4, tambi?n los capacitores y el opto acoplador
Te env?o link del manual de servicio del JVC THS 55 DVD y la hoja de datos del STR G6551
Espero que logres hacer funcionar a tu JVC THS 55 DVD
Saludos Franco Dosil

https://data2.manualslib.com/pdf6/131/13048/1304751-jvc/ths55.pdf?db8ebd3eff0aa0d74663cb4bd3a1ca7f&take=binary

https://www.promelec.ru/pdf/STRG6651.pdf
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JVC THS 55 DVD Player power supply not working. I tried replacing STR G6651, but still not coming ON. I am getting 12.6V on STR supply pin. What could be the problem? Without that DVD player I can not use...

Hello, Francisco for what you are saying, that you have 12.6 volts in leg 4 (Supply) of STR G6551, according to the data sheet, it is low, it starts working from 14.4 volts, typical 16 volts and maximum 17, 6 volts
you would have to check the values of the power resistances of leg 4, also the capacitors and the optocoupler
I send you link to the JVC THS 55 DVD service manual and the STR G6551 data sheet
I hope you manage to make your JVC THS 55 DVD work
Greetings Franco Dosil

Hola, Francisco por lo que comentas, que tienes 12,6 volts en la pata 4 (Supply) del STR G6551, seg?n la hoja de datos, es bajo, arranca a trabajar desde los 14,volts, t?pico 16 volts y m?ximo 17,6 volts
tendr?as que revisar los valores de las resistencias de alimentaci?n de la pata 4, tambi?n los capacitores y el opto acoplador
Te env?o link del manual de servicio del JVC THS 55 DVD y la hoja de datos del STR G6551
Espero que logres hacer funcionar a tu JVC THS 55 DVD
Saludos Franco Dosil


https://data2.manualslib.com/pdf6/131/13048/1304751-jvc/ths55.pdf?db8ebd3eff0aa0d74663cb4bd3a1ca7f&take=binary

https://www.promelec.ru/pdf/STRG6651.pdf
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Chances are you have shorted output transistors,check with ohm meter across all 3 legs,there should be no shorts if good.. cost on average around 150.00
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Can you post your location as I may have one of these in my stash.

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