No power witch transistor can i replace when is have no power with de s9

Hello Erwin, for what you are saying, you may have a short circuit problem in the input rectifier, in the input regulator, in the PTC, responsible for the demagnetization of the TRC tube and also you may have problems in the Horizontal, FlyBack in short Horizontal output short circuit or transistor
Try disconnecting the horizontal output transistor and the demagnetizing coil and instead of the fuse and connect an incandescent lamp (the one with the filament, not the low power ones) of 150 watts, connect and check if the lamp is turned on completely, you still have a short circuit, check the source diodes and the regulator
If you do not have technical knowledge, contact a specialized technical service
comment the results
Greetings Franco Dosil

Hola Erwin, por lo que comentas, puedes tener un problema de corto circuito en el rectificador de entrada, en el regulador de entrada, en el PTC, encargado de la desmagnetizacion del tubo TRC y tambi?n puedes tener problemas en el Horizontal, FlyBack en corto circuito o transistor de salida Horizontal en cortocircuito
Prueba desconectar el transistor de salida horizontal y la bobina desmagnetizadora y en lugar del fusible y conecta una lampara incandescente (la que trae filamento, no las de bajo consumo) de 150 watts, conecta y verifica si la lampara se prende totalmente, sigues teniendo un corto circuito, revisa los diodos de fuente y el regulador
Sino tienes conocimientos t?cnicos, ac?rcate a un servicio t?cnico especializado
comenta los resultados
Saludos Franco Dosil

Hello Jeff, for what you describe you have problems in the phono preamplifier stage, it is usually solved by making a replacement of transistors, electrolytic capacitors and some fuse resistors
If you are going to do this work, it would be good if you apply it in all the capacitors and low signal transistors of the equipment
It is very important to get good low noise transistors, just as the capacitors are of the highest quality, to maintain the excellent sound of your Sansui AU-517

Hola Jeff, por lo que describes tienes problemas en la etapa preamplificadora de fono, por lo general se soluciona haciendo un recambio de transistores, capacitores electrol?ticos y unas resistencias fusible
Si vas a hacer este trabajo, seria bueno que lo apliques en todos los capacitores y transistores de baja se?al del equipo
Es muy importante conseguir buenos transistores de bajo ruido, al igual que los capacitores sean de primera calidad, para mantener el excelente sonido de tu Sansui AU-517

Probably took out the output transistors for that channel. Is the unit dead now? Usually in these models, if the outputs go, it takes out the main power fuse.

you have a problem with the electricks on the psu board witch is causing a short to that transistor

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PROBLEM :-The power supply of the projector is faulty there is a transistor witch is switch 15 volts for the lamp drive board.

SOLUTION: Remove the upper cover with 6 screws back side of the projector.
remove main board and lamp cover with 7 screws.(show in the picture)
remove upper cover of the power supply and lamp drive unit with 3 screws.
remove power supply unit with 4 screws and 3 connectors and put face down on the table.
now you find the transistor no Q107 and replace with the transistor no 2SB710 is and surface mounted compunent(show in the picture)
fix it all as you open.
power ON the projector and enjoy

(doing very carefully This is a technical job)

If you want to know what the part number of the power amp in your unit is, it will be either a TDA2030 or TDA2050 which ia a 5 terminal audio amp of 14Watt or 32 Watt respectively.

On E152fpb dell only replace all driver transistor the c5706 or c5707 this 2 types of transistor is not desame one is PNP & NPN so you must be careful of replacing component maybe it will help you

The device power-up lights acts normally with 5...9 V DC.

audio transistor. is out if no AM modulation. how is SSB... 3174269649