Hope you could help solve my problem... my ComponenJVC CA V808T ..VCD Mini Component it got no power supply, but by pressing the remote control it does open but abruply fuses blow , and zener doide as well....Why is it? I got no service manuals so I could locate the problem.... Please help me....
I am not familiar with the audio system , but I do repair TVs, ..funny....
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Chargers have higher voltage ratings than the one it charges. It also lacks the needed filters to supply the exact direct current which damaged your equipment but first check if it blows up your fuses when you connect the power supply. If it does check for Zener Diodes usually connected to the mains of the equipment to simulate the simple crowbar effect of protection. If it does not blow up your main fuse then the fuse might be in the circuit board of your base unit. Zener Diodes are cased in striped crystal that short circuits itself when applied with reverse or higher voltage rating power supplies. You will need a multimeter positioned at continuity to test this. Remove it and replace the fuse then apply power, it will light up but remember to replace the damaged part for protection.
When the GPS unit was wired in reversed, a number of the electronic components would be damaged. However, in most units (but not all), there is a component specifically made to sacrifice itself to go dead in such event(s) other than the fuse. The is often called the reverse protection diode. This would normally be connected right after the power entry point after the fuse. In some designs, it would be after the power ON/OFF switch. Should there be no such diode, then next in line to be the most likely culprits would be capacitors, transistors, ICs, other diodes (specially zeners). If the trouble is basically limited to power supply, familiarity with electronic components and circuitry, use of a DVM and a soldering iron should be sufficient to initiate diagnosis and repairs.
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Try checking the reverse protection diode. This diode would normally be connected right after the power connector and would be the biggest diode inside. One way to verify if this is defective and causing the fuse to blow is even with the power switch at the OFF position, the fuse will still blow.
If on the other hand, the reverse protection diode is good and fuse will not blow when power switch is at OFF, then the short/defective component is inside. There would only be two (2) major components that can cause the fuse to blow with the power switch to ON, the final transistor and/or the audio IC.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
I've just changed the grilled fuse and the zener diode which was shorted. The problem is to find where they are on YOUR mobo if it's exactly the same trouble...
At least, did you find the fuse (very often the first component after power jack) ? and diodes are small red or orange glass cylinder with yellow ring.
The fuse should be conductive of course and diode should be conductive in only one direction. For both, check it with ohmmeter, in each direction for the diode (change probes of meter on poles).
If necessary, change compononents : be carefull with diode polarity because it's important (colored ring in the same direction).
I hope this will help you...
There are only a couple of components that could cause the fuse to blow. They are: 1. Reverse protection diode (D23) 2. filter capacitor (C123) 3. Outputs (TR14 & 15) 4. Audio Amp (IC4) 5. Zener Diodes (D22 & 19) 6. the fuse itself (it should be 2 Amps
Hope this be of help/idea. Pls post back how things turned up or should you need additional information.
D23 is the reverse protection diode and it shorting is the primary
reason your fuse blew. As you posted, power was applied in reverse,
hence other components would also fail. Pls check:
1. D22 - 9.1V Zener Diode
2. TR23 (2SC1096) 9 Volts regulator
3. D19 - 5.1 Zener Diode
4. IC4 (TA7222) - Audio Amp
5. TR14 (2SC2029B/10) - Finals
6. TR15 (2SC2028B/20) - Driver 7. Most capacitors over 220uF (like C123, C114 & C112)
Hope that this be of help/idea. Pls post back how things turned up or should you need additional information.