Advice/info please - my surround sound has stopped working

[Chris Bristol]

Hi there I wonder if anyone can help me, I've got a Panasonic SA-PT570 surround sound home theatre system, the problem is it won't turn on, for the past couple of weeks it has sometimes taken a couple of presses of the on button on the remote control to make the machine come on, or I've had to hold the button for a couple of seconds to make it work, new batteries made no difference, ( we generally only use the remote control and not the buttons on the machine itself). But now it won't come on at all! Other than this issue with turning the machine on everything else worked normally once machine was on. when I attempt to turn it on now it makes the usual click noise but then there's a 2nd slightly quieter click about half a second later and the machine doesn't come on, however if I repeat the process of pressing the on button then after the 2nd go it doesn't make any click noise at all, just nothing, as if it were dead lol, if I unplug and plug back in it will make the click noises again when attempting to switch on but will only do this the first two times and then nothing if you keep trying, just dead, the same happens regardless of if I use the remote or the on button on the machine itself. I would please like to know if anyone knows what this fault might be? Is it fixable? Although I wouldn't have the skills to fix it myself I would like as much info as poss so I don't get ripped off if I take it to a shop to try and fix, I know this machine is rather old now and I'm new here but I can't afford to replace it so would really appreciate any help or advice, I think I've given as much info as I can/know, but please ask if there's anything u need to know that would help diagnose the problem. thank you for taking the time to read this.
Chris

 

[shrtrnd]

At first I thought maybe it was your remote, but you then said you have the same problem when you depress the
"ON' pushbutton on the unit itself.
I know you don't want to hear this, but it sounds like you have a problem that is going to take a repair technician
to localize and repair.
If I were you, I'd check as many of the local repair shops close to you, and get their estimate to check it, before
taking it in to one of them. Reliable places will charge a flat-fee for an estimate, and offer to dispense with the estimate fee if you agree to apply it to the repair cost.
From the estimates, you can decide if you want to try to repair it, or replace it if the price of repair is too high.
When you call for estimates, you might want to concentrate on shops that are factory authorized for Panasonic.
That's my suggestion.
You may get other advice from others here who will see you post.

 

[cjdelphi]

So the relay energizes you hear the click and then the relay drops out...

Power supply fault by the sounds of, you could be lucky take some photos inbthe area of the clicking noise (a little plastic box) careful not to touch any mains voltage, power up listen and locate, pull the power cable and get testing

 

[73's de Edd]

.


Sir Chris Bristol . . . . .


You DO realize that is a one serious task to be taken on by a mere mortal ?

Considering that you minimally DO have a DVM and can take some initial readings.

Here is that units basic building block . . . . of which, I have eliminated 98.96 % of its complexity.

The most significant info given so far is the gradual onset and cantankerous turn on action of the unit.
Can you pinpoint that as . . . a day or a week or a month . . . which could be erroneous, in accordance to the frequency of use of the unit, but more accurate if it has received almost daily use.

On a turn on, take particular note of any and all . . . . LEDS or displays that light up . . . . and if they all go away on shut down . . . or if maybe one stays.

Once it does shut down unplug the units AC line power and then find the common 8 wire cabling running from the G board SMPS unit as its connector H5801 and it transverses down to the D class digital power amp F board , where it is then cross designated as CN5500 .
Unplug that cable at which ever end you please. . . . . but F is being referenced to, later on.

Then power up the unit and see if it still shuts down, if not, and it stays on, see what lights, bells and whistles remain lit up . . .but definitely expect no sound to emanate therewith.

If it now stays on, take meter in hand and switch to DC voltage mode and 50 VDC range and then, considering that you unplugged ye olde cable from the power amp board F:

Referencing to the naked, unplugged in cables connector end now, and NOT the connector on the F board.

Negative meter probe to pin 5 or 6 and Positive meter to pin 7 or 8 and log down and report its voltage value back.

Move Positive meter to pin 3 or 4 log down and report its voltage value back . . . .expecting a NEGATIVE voltage there . . . . with that voltage value needed also.

Thasssssit . . . . .


SYSTEM BUILDING BLOCK . . . . . BARE BONES . . .

73s de Edd

.

 

[shrtrnd]

Sheez.
I thought Chris Bristol said 'I wouldn't have the skills to fix it myself'.
Maybe I read that wrong.