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Re: No power to GV3080X
Sorry but if a fuse blows theres a reason 99.999999999% of the time. as a fuse very rarly goes bad all by its self. This unit is a difficult one to trouble shoot unless you have the schematic diagram. It sounds like your missing the main b+ voltage and could be the regulator ic or a capacitor in the supply. If your not a tech you will be shooting in the dark replacing parts as you need a good muti-meter to assist you in these types of repair. Good Luck
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If it's that delicate, but you still want to keep it, you could try changing-out the mains fuse in the unit for a really, really low amps one.
You might be getting a power-surge as the power goes off, or as it comes back on. A very low fuse, might blow on the surge, which will leave you needing to replace the fuse, but not the capacitors.?
Best of luck.
Hello! did you hear any unusual noises, while unit tries to power up? If yes, some gears might got out of timing or broken. If not, open up the unit and look for "bloated"capacitors in the power supply area. Find those? Replace with the same value and temperature ratings(105C). If not, surrender to local repair shop. Unless you equipped with "in circuit" capacitor checker and necessary soldering/De-soldering tools. good luck, Alex.
Fuses blow like that when a semi-conductor has shorted and acting like a piece of wire. Transistors diodes etc will show up quick with a Ohm meter, has it will be just like you have touched the probes together!
There can be different issues in the mechanism or electrical that will cause the unit to shut down. However, since the power is going off completely after the initial plug in I suspect the power supply.
The SMPS, Switch Mode Power Supply has filter components that age due to heat, the voltage output on the filters reduces until the Micro Processor malfunctions and the unit won't stay on. The power supply filters can be changed by an experienced technician for $10-$15.00 in parts plus labor.
If the fuse(s) check out OK, and the unit is showing no other signs of life I'd say you have a faulty switch mode power supply circuit - the best place to start is by checking all the electrolytic capacitors in it (look for any that have ruptured or are bulging on top and replace them with new caps of the same value and voltage if possible), then progress from there. Assuming the failure hasn't taken any other components out, re-capping may fix the problem but if the PSU has an IC regulator, it might be worth checking that as well. If it is shorted you may have to order a new IC which could be expensive (assuming the part is still available).
The faint sizzle would be the power transformer arcing as current passes through it. I believe there are no less than 10 caps in that circuit you need to look at. All electrolytic and all can be potential troublemakers.
You should only need to look at the caps in the power supply (replace any suspect/ruptured/leaky ones if necessary) as a starting point. If it gets too hard after that, consult a service center for a third opinion.
just hook up a vhs or dvd player from home that has tv outputs, but you would need a power inverter for the power supply of the vhs, then put the vhs audio and videos outputs to the dual's input: the auxiliars. make sure the vhs has channel changing.
Is it plugged in?? When was the last time you used it?? Did this happen after a storm?? What make and model of vcr?? How old is it?? We need more info if you want help on your troubles then it dosent work.