Str x6750 why the o/p voltages are more than 150 volts?

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

Yes, it is the high voltage circuit. My Samsung got worse and worse until it did not turn on anymore. Searched the web and said that was the capacitor rated 100 uf at 450 volts. I measured 380 volts at the capacitor. Had saved a 150 uf and a 220 uf at 400 volts. Tried the 220 uf first but was only a little better, but both 150 uf and 220 uf in parallel fixed the problem. Measured the voltage at 391 volts.

INSPECT BATTERY ELECTROLYTE LEVEL
INSPECT BATTERY CABLES/TERMINALS
LOAD TEST BATTERY,_______VOLTS @ 150 AMPS (Min SPEC 10.2 VOLTS @ 150 AMPS.)
INSPECT BELT(s),
TEST ALTERNATOR OUTPUT (ON THE VEHICLE,'NOT' BENCH TESTED),
1 _____AMPS @ 12 VOLTS @ 2500 RPM w/PLOW not ENGAGED
2 _____AMPS @ 12 VOLTS @ 2500 RPM w/PLOW ENGAGED ALT OUTPUT SPEC ????

If you need further help, reach me via phone at https://www.6ya.com/expert/ralph_2f0886b7d6af32ce

UPS will provide constant voltage out put.
The average working condition of UPS is 170 to 270 volt.
Below the level may not work.

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

Why are you trying to run your TV on 220 Volt?

The speed will change the 'frequency' too. You need to make sure you still have 60 Hz. You may have need a voltage regulator adjustment, not a speed adjustment.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

check voltage at the primary filter then check voltege at pin no 1 of STR dc which should be approx input volt if not then clear the path if present then check check up down volt at pin no 3 if not persent then replace the small capacitor near it the problem will be solved

yes you can use a step down converter,but remember to use a higher rating converter.if your receiver need 100w ( or 1A )then you need a converter at least give 150w ( or 2A ).

The voltage of the fuse is not the issue. It sounds like you may have some blown internal transistors (probably in the output area). Time for a trip to the repair shop I'm afraid.