Question about JVC SR-DVM700 DVD Recorder/HDD Recorder

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I have an SR-DVM700EU that would not power up. I have replaced multiple failed components in the switchmode power supply, and it now works. The unit would power up but stop someway through the booting process displayed on the front panel.I have replaced the hard drive with a new pre-loaded drive from JVC for this machine, and it then booted completely, and can be turned on from standby. Now after a minute or so the machine completely powers off and will not come back on, unless it is removed from the mains and left off for about fifteen minutes.

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Did you replace ALL the electrolytic capacitors in the power supply? Generally, whenever there are several faulty components in this part of any circuit, it is a good idea to replace all of the caps as well as checking for leaky diodes and faulty IC regulators.

My guess is that the SMPS still has an intermittent partial fault, which is preventing the unit from staying on. I would recommend that you check the ICs in that circuit, replace as required (if you haven't already done so). These can be 3-pin or 5-pin regulators, but they are voltage rated, so obtain the correct types for this model if you do decide to replace them.

I hope the fault hasn't spread to the microprocessor on the main board - this can be expensive to replace if faulty. I would recommend that you re-check the power supply again - thoroughly. Touch up potential dry solder joints if necessary.

If the unit still misbehaves after all of this; perhaps it's time to consider submitting it to a workshop, get a quote (and a second opinion) on the likely cost(s) of repairs, then you can make a decision afterwards as to whether or not you wish to go ahead and get this fixed for good. It's up to you.

Posted on Mar 11, 2011

Testimonial: "Hi, Thanks for your reply email. It did encourage me to go back and replace two electrolytic caps that I had checked with a capacitance meter. "

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My amp was blinking while it was working then it went off.Now it doesn't power up..Crown Xti 4000


Power supply likely failed. Electrolytics are the primary culprit.
It should have a switchmode power supply, so it is lmost likely the 5 volt section failed.

Sep 17, 2012 | Crown XTi 4000 Amplifier

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How do I replace my Power Supply?


Ok there is generally nothing "Special" about mains, wall power supplies, they simply provide DC volts, via a step down transformer, or switchmode technology, now there are ONLY three important things to know and they are, the Voltages, and Amperage, and Power Plug Polarity. You can often find this A: In the manual under Power Supply Specification, B:Or on the Actual power Supply itself, If one looks carefully, there is always on a UL listed power supply, the Output Voltage & Amperage, often Polarity is indicated too. If not, that can be gleaned usually, by looking besides the power input socket, on the actual unit, and, it usually, has a little drawing, with a dot and a 3/4 circle around it, with a + & - showing what goes where. In almost all occasions, though, it is Positive to the CENTER, & Negative to OUTER, (or earth). All you have to do, is get any other power supply that has the SAME Voltage and Current rating, IE: 12 Volts @ 2.5 Amps. Now any 12 Volt supply that gives, the same or MORE than 2.5 Amps will do. You just need to ensure that the Plug is right, often the plugs are different, that too, can be overcome, simply, by cutting off the OLD, plug, and cutting off the NEW plug, and joining, Old, to New end on PSU. Again, usually, Positive is the Center, and the Negative is the Outer. Right go get that supply. Ebay or Radio Shack, are good places to start. Also any other "Laptop" power Supply that has same specs as described, will also work. As a matter of point, switchmode is generally "Cleaner" power than a transformer one.. but it is NOT critical. All laptop, and some other things, power supplies, have "Chips" in them, to "Help" with charging? thats what "they say" Sometimes, you cannot replace this type of power supply, with anything other than the exact replacement, BUT it is still worth a "try" it will/should not ruin anything all that may be compromised may be the "Charging" of the/any battery. That is why batteries can "Fail" and cannot be recharged, NOT due to the batteries actually being "Faulty" oh no, it is simply that the "Chip" has failed and that often, stops the battery from being "Seen" and/or recharged.

on Mar 02, 2010 | Computers & Internet

1 Answer

I lost the power in my house and when the power came back on, the power on the Go video will not come back on. I can not find a reset button.


Sounds like the a general failure of the switchmode power supply in this unit. Easiest and quickest way to determine this is to visually inspect the supply board for obvious signs of trouble - check for any blown fuses, swollen/leaky capacitors or burnt components. It is probably something really simple like bad electrolytic caps. These are inexpensive to replace, but you should have ALL of them replaced at the same time, to minimise the risk of further failures later on. (note their working voltages and various values, and observe their polarity in relation to the board markings when replacing them) Electrolytic capacitors have a nasty habit of failing under unusual conditions by themselves, and the destruction they cause when they leak, could be extreme.

You may be lucky with the other components in the PSU, and these may be OK, but check the fuse and the caps first. See how you go. If this does not restore power to your unit, consider a workshop repair quote, but only as a last resort when all else fails, and you cannot go further yourself.

Apr 19, 2011 | GoVideo DVR4400 DVD Player/VCR

1 Answer

What will be the problem when it is not showing power


No power is a typical failure of the switchmode power supply, which, unless you have sufficient knowledge of this circuit, requires a workshop service centre repair. Several components, including the most likely culprits (electrolytic capacitors) will need replacing. In extreme cases, the entire PCB will need to be replaced.

Bad caps are usually very easy to spot in most power supplies, look for crooked, swollen or bulging caps, and/or splits in their vents (the impressions in the tops of them) along with electrolyte spilling out (electrolyte is highly corrosive, so if any has leaked out of any caps onto the PCB, it may damage the copper tracks). Some may have dropped in value, some may be open-circuit (no capacitance at all), while others may have taken out one or more IC regulator and/or the chopper transistor(s); this could lead to an expensive repair, particularly if surface-mounted components on the copper side of the board are short-circuited.

NOTE: when servicing switchmode power supplies, with electrolytic capacitors, it is standard practice to replace ALL the caps in this circuit to ensure reliability and to minimise the likelihood of a service recall later - even if the ESR of some caps measures OK, they should still be replaced, and in a lot of cases, the working voltages and values of those capacitors which are replaced may be uprated/increased.

As I said, unless you have knowledge (and experience) with this type of circuit, submit your unit to an authorised repair centre, get a quote on the likely repair cost(s) and/or a second opinion from an authorised technician as to the extent of the fault(s) in your unit, then make a firm decision afterwards as to what you want to do about it.

It's up to you - either spend a fortune in repairs to this one, or, if it is NOT a DVD recorder, buy a new player - but only as a last resort. I suggest that you get the repair quote first before going any further.

Mar 31, 2011 | Panasonic Televison & Video

1 Answer

My player is samsung p380. it is not working. only the powerlight(red light)is glowing. can you suggest a solution


Does the unit operate with the remote? If not, then there is a good chance the switchmode power supply is faulty, mostly due to a short-circuit, hence the standby LED being the only sign of life.

It is either a protection circuit which is active, preventing the unit from operating, or simply no regulated output from the PSU.

Usually IC regulators in the PSU short-circuit, or suffer partial failures, resulting in the aforementioned symptoms. Electrolytic capacitors also cause major problems in this area. The trouble is, if you submit the player to a service centre/repair shop, it could be expensive and/or uneconomical, as the unit is not a DVD recorder, and you have to remember a workshop charges labour per hour on top of any part(s) they use. You can obtain a quote on the likely repair/part(s) cost(s), then make a decision afterwards as to whether it's worth going ahead or not. It is up to you.

As I have mentioned in previous postings, Samsung have a habit of using unusual rated/obscure valued ('specialised') components in their switchmode power supplies, making these very difficult to repair without some modification. Some of those components are not available to the public off the shelf, so this has to be done by a qualified technician in a fully equipped authorised appliance service workshop.

If you find that it is likely to cost you more than the retail price of a brand new unit, cancel the repair of this and buy a new one - but ONLY as a last resort when all else fails. New players are cheaper to buy (even Blu-Ray), while repairs on existing models become more expensive and parts become more difficult to obtain.

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1 Answer

Lost video then later lost audio can it be fixed


Well unfortunately these day I find more and more in my shop, that many repairs are simply uneconomic. With the cheap initial buy prices, often a new unit, will cost only slightly more than a repair, plus the fact, one has a new warranty, new, components, and a new machine. As with any electronic device, once
"Stressed" by a component failure, many many units fail again within the next year anyway according to figures. So unless it is a relatively inexpensive repair, then my professional opinion is that a replacement unit, would be a better place to spend the repair monies.
Your problem, may well be a switchmode power supply problem, the thing to do, is contact Sanyo's head office, and ask for a referral to a local authorised service center, then take the unit to them, and ask for a "Quote" as to the cost of repair, this way you can make an informed decision as to repair or replace.

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1 Answer

Im looking for a curcuit diagram for the switchmode power supply in my Behringer PMP3000.


If the supply failed I can tell you which parts to replace... and if it failed there may be a failure in the power amp that caused it. You can contact be directely at fredy2 @ aol.com... put Behringer in the subject.

The supply when it fails takes out eleven components including two expensive IGBT transistors. If the rearmost amp fried, add at least four more components and a lot of work carving out burned board and wiring around the blown circuit traces.

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1 Answer

The tv shuts off by itself. I will turn it on..and after awhile, it just turns off by itself, and then after about a minute I can turn it on again and watch tv for awhile, and then it will do it again.


It seems that your unit has some sort of PSU fault, or a problem that is shutting down the Power Supply Unit, PSU. This happens so that no further damage, and possible fire will occur. The faulty component(s) are heating up, tripping the fault control, and shutting down, it cools down again,and will restart, then the process repeats, it will eventually fail fully.
You need to take the unit to a reputable service centre/man and ask for a firm "Quote" for the work to be done. It is that sound that gives it away, this is a typical switchmode Power Supply problem.

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1 Answer

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12fixlouie

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1 Answer

Our microwave turns on then shuts off after approximatly ten seconds. What can I do to fix this problem?


It seems that your unit has some sort of PSU fault, or a problem that is shutting down the Power Supply Unit, (PSU). Either this or the magnetron is failing. This "Shutdown" happens so that no further damage, and possible fire will occur.
You need to take the unit to a reputable service centre/man and ask for a firm "Quote" for the work to be done. It is that sound that gives it away, this is a typical switchmode Power Supply problem.

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