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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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Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis.
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.
If the unit is totally dead meaning no standbye light of or nothing on the display its dark, then you may of blown the AC line fuse. This is the first thing to check the fuse is inside the unit you can trace its location by taking off the top of the VCR and tracing the pwr cord to the point where it connects to the power supply, here is where you will find the AC line fuse use a ohm meter set on continunity to check the fuse for open condintion. If open or blown replace with same voltage and Amperage rating as indicated on the board or the fuse itself. If you find the fuse is good then you have a power supply standbye voltage missing and is related to the power supply. In which case it may be cheaper to just purchase another.
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.
There is a small glass fuse there as well. These units have aswitch mode power supply and the transistor that is attached to the heatsink sometimes gets shorted. This is the most likely problem. If you feel comfortable working on these and can solder, let me know and I'll provide more detailed information.
If you have some tech savvy and a voltmeter, you could check the power supply voltages. This circuit is likely in the close vicinity of the fuse. On the output side you should see a +5 volt, +12 to 15 volt, and perhaps a -35 volt (approx). The +5 supplies the logic circuit, +12 the motors.
If these voltages are missing, or way out of tolerance, you will have a dead unit. A frequent cause of problems in the supply is bad electrolytic capacitors, especially in the older units (Panasonic manufactured rigs, late '80s/early '90s). Possible values on these capacitors: 2200MFD/10V 1000MFD/16V and several others. Replacements can be supplied by MCM electronics, Mouser electronics. I use the Panansonic FC series from Digi-Key Electronics.
If this is a high dollar > $250 VCR, it might be worth service center repairs. If not, then it is a disposable (unfortunate, but the way it is with most modern electronics).
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.