Question about Harman Kardon DVD31 DVD Player

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Power suplly problem, i need to connect and disconnect many times

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  • Harman Kardon Master
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If you constantly need to plug and unplug unit from a power point in order to get it to work at all, chances are the PSU is faulty, and the unit should not be used while in this condition. The usual suspects in any switchmode power supply circuit would be electrolytic capacitors (although in a lot of cases IC regulators play a role in partial or complete failures), you can easily tell which are bad just by visual inspection - bulging, leaky or crooked ones are the most obvious.

The best option is to adopt a blanket approach and replace every cap in that circuit (don't forget to uprate working voltages of each cap and where necessary, increase their capacitance values for assured reliability/safety - you need to be tech. savvy and be good with a soldering iron and various pieces of test equipment including ESR meters to measure the caps).

This should help, but if this does not fix your problem, or you have limited or no technical expertise, the unit will have to go to a service centre for further analysis/quote for more repair/parts by a qualified technician - the bad news is this could become very uneconomical in the long term; more than the player is worth new. But at least with a quote from a workshop you can make a decision on whether you want it fixed for the estimated cost(s) or not. It's up to you.

Personally, experience tells me that since this is not a DVD recorder with many elaborate features, it might be cheaper to simply buy a new one. The difference between the likely repair costs to fix this unit vs. a brand new one with a manufacturer's warranty could be very significant.

That's the trouble with 'budget models' they fail far too soon, while new ones become cheaper to buy, repairs to older units become more expensive, and there's little or virtually no chance of spare parts being available to fix such products.

However, you should only consider replacing the whole unit as a last resort - explore other avenues first to determine pricing/service cost differences.

Posted on Mar 24, 2011

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1 Answer

The stand by button is flashing and wont turn on


1. take out from supply ,by take out power cord from outlet
2 reconnect power suplly and switch on,manually if needed, and then do hard reset,as is written in factory manual ( turn back to factory settings)
3 if that not help ,disconnect last connected device,or all and try again
4 check one more time power line voltage on outlet, , voltage selector on back plate on device, and for test purpose only connect ur AV Receiver plug directlly to outlet,without any extension cords with other outlets or devices on them ,as that can be source of problem ,too.(power,or voltage drop bellow point that is needed for this power drawing device to be switched on)
5 also disconnect for test purpose dig coax,and or antenna inputs..best is to disconnect all,and connect in directlly to power line outlet,and then to try hard reset to factory settings.

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F 70 APPEARS ON THE DISPLAY


Page 24:

"Turn the unit off, disconnect the AC power suplly cord, then reconnect and turn the unit on. Consult you dealer if "F 70" remains in the display.

http://service.us.panasonic.com/OPERMANPDF/SADX750.PDF'

Support: 1-800-211-PANA (7262)
http://www2.panasonic.com/consumer-electronics/support/Contact-Us.4

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sounds to me like the power suplly unit as this would be the first thing i would change in the shop if this answer helps please rate it

May 13, 2010 | Computers & Internet

1 Answer

My Power Suplly makes a high pitch noise and the


The problem lies in the reduction of operational frequency. It is mainly caused during the loose of ferrite cores or failure of HV diodes across the primary coil.
1) Check the looseness of ferritte cores parts loose or fixed properly ?
2) If OK Just check the components parallel to the high voltage side of the big transformer.
3) Check low voltage schottky rectifier diodes. One must be shorted. Just remove and here the sound. If it disappears, it must be faulty. During this test, the output voltages may increase to three times also. So, to safeguard, disconnect the filter capacitors.
Solution :
1) If any of the core becomes loose, just join it properly with epoxy or glue.
2 & 3) If any device fault occurs, just replace it in case of schottky rectifier diodes better replace with higher capacity. Capacity with numbers are given below :
1N5822 => 3 A
F12C20=> 6A per channel total 12A
MBR 20150 => 10A per channel.
MBR 3035WT => 15A per channel

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1 Answer

I have ACER ASPIRE 2920, the power suplly can't turn ON


There could be a problem with the battery. A fast check to determine whether you have a problem with the power adapter, power cord or the laptop's battery is to turn off the laptop, remove the battery, connect the power adapter, turn on the laptop & see if it works.
If the laptop works directly from the power adapter with the battery removed, then the power adapter is good. In this case we can suspect that the battery is defective & needs to be replaced.

If this did not work, try also disassembling the laptop & make sure that all main components are seated properly. Also make sure that all ribbon cables interconnecting the various components of the laptop are tightly connected.

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How do i get into a dell w5300 to change power supply?


You can remove the side panels and then remove the cover over the power supply. You'll also have to remove the fuser connections.

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PS3 The power light was on when I left the house and when I nreturned from a weekend trip, it was off and I have no power to the console. I checked the power lines and changed the power cord and still no...


cant not leav ethis on mor ethen 12 hours at time leats need 3 hours cool down after 12 hours play and never leave this on idal on a screen way to hot man u blew out power suplly

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1 Answer

On and off


Sounds like it is shorting out. Do a voltage check on the power source.

May 26, 2008 | Computers & Internet

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