Hi robotek. one day when my nad t562 dvd player was only about 18 months old, a component that looks like a large resistor on my power supply scorched the board and the capacitor next to it. i didn't have a proof of purchase, so i didn't pursue warranty repair. now that i know how to solder, i'm wondering how i determine exactly what the parts are and if i can replace them on the board, or if i need a new board and where i might get it. i have not heard back from nad tech support. i can send photos.
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Re: power supply board component out
I would replace the capacitor first and check the resistor with an ohms meter to see if it has changed in value(gone high). remounting the resistor (you may have to replace it also to do this with longer leads) to be clear the Pcb and also the capacitor to be as far away from the resistor as a heat source also may help. Darkening of the board is not uncommon where there are power components. Having said that, it should not generally happen in the first place... but it often does. Power supply failures in modern gear relates to heat stress so often. Capacitors failing from this overheating is the biggest problem of all. In the workshop, where we suspect that caps have failed, we generally replace them all, and always use good brand name 105deg rated devices(Rubycon or Nichicon brands i prefer) to help minimise the recurrence of failure. You can order them from Farnell in most countries of the world. If you cannot identify the values of the components, I am happy to try and help you here. Please feel free to ask any questions you may have. FixYa rating is the best way to thank me for helping you out. Cheers
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Sounds like main board fault. Check and replace the damaged component/s at its main board. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
It may have a little switch so you can choose to either use it with a battery or with the power supply. If not try taking out the battery and see if it works. If it does not work with the battery taken of then it is the power supply. You can further check if the power supply is putting out voltage with a multimeter if you have one. Note that it might read a a few volts higher than 6 volts which is normal. If it reads less than six volts then it is no good.
I think you must have a good supply of current for the player and maybe you must try with rechargeable batteries. If this wont work the set has a fault in the power supply input regulator wherein the regulator must have a fault.You will need to remove the covers and use a multimeter- if you are familiar- to confirm this regulator. replace and proceed. Good day
There are a few ways to determine a lazy spindle motor.
listen to it. If it sounds like a diesel engine, with regular knocking sounds, bearings are failing... new motor
sit the unit on its side, see if it then reads...if bearings are worn, this reduces "slop"in the motor that can contribute jitter to the RF waveform. If it plays then,new motor
put a drop of oil into the top bearing of the motor. If it starts to read and run ok, then the bearing may be tight, and need lube, or the oil is acting as a hydraulic bearing. It will not fix the problem if it is a worn bearing. ...new motor.
if it spins up slow, and with screeching noise, the bearings are tight. see below for a solution.
Some other solutions.,
disconnect the connections to the motor remove a top mounting screw from the motor, and use a straw to flood the motor with crc 2-26, and spin up for 5 minutes one direction at 12 volts, then the other direction. Cleans the armature and brushes.
I always use a steel ruler to measure the height of the platter to the deck of the transport. then set the spindle height for the new motor up to the same as I measured. Happy to answer and questions that you may have. I have repaired literally hundreds of cd players over the years... including many NADs Cant recall just what the 501 has. But spindle motors cause a lot of problems with cd players.
Sadly I think the control and output chipset have gone and unfortunately aren't really worth fixing. You can get replacement parts, that aren't that expensive, but if you don't know what you are doing it's a mine field. To get someone else to repair it would probably cost the same as buing a new one. Sorry to be the bearer of bad news :(
With the large variety of video formats available nowadays it's difficult to find a unit that plays them all. Chances are you want to play a movie you burned yourself, and though it plays on your PC, it will not play on the DVD player.
Try playing the disc on your PC, and then try different DVD units, perhaps pretending you're shopping for one and want to try your own movie. Chances are these new units may NOT play it either, perhaps because you're using DivX or Xvid two video format contenders on the PC because their codecs offer great compression and very good quality (small file size and even HD video).
If it works on your PC it's because you may have the latests codecs (codifier / decodifier) installed, since some of them may have installed themselves as plugins for your browser, or come as part of a DVD viewing program you may have installed, like WinDVD.
For the time being, watch the DVD on your PC and upgrade your player, if it's more than 2 yrs. old.
He was not being lazy - in the past year or longer, as Philips has sold it's TV division to Funai, the parts needed to repair their projection TV's are no longer available, even to authorized Philips service centers.
Mystical Chicken, all that needs to be done is to open up your player and re-flow the solder connection where the ac adapter goes. It is a fairly simple task, given you have used a soldering iron before. If not, just send it to me and I'll fix it.