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In Reply to: RE: I only hope it's that simple... posted by twl168 on January 09, 2008 at 15:13:04
Any progress?
Follow Ups:
I am totally clueless now. No progress. yet, it is even worse. now the display only show a few light up. i am convinced that it is the cable that connected the display to the pcb. but i check the connection and all but can not seem to find anything wrong with it.
I also look through all the connections as advised, but can not determine anything wrong.
The player is still opened up at my workbench. every night, I would check a few or play around with connnection. but no progress what so ever. I am almost at the point of through in the white towl.
Are you sure you have the cables in the right places? Also, if you pop the opamps out, any change in the display?
When you put the opamp sockets in, how far did you lift the PCB up? Any chance that you broke one of the transformer leads to the PCB, etc.? Are all voltages present (+/- 5Vdc, +/- 15Vdc)?
I could send pics of mine if you need to verify connections, etc.
Hmm,
I did not thing about the transformer leads. I did check voltage on pin 4 and pin 8 of each op amp socket. -15v and 15v, both correct. as far as anything else, not sure what the correct voltage should be, no way of checking.
Where are the +/- 5v and +/- 15v checking points?
I am certain that my connections of cables are correct because I do have a diagram from so called service manual.
When I was de-soldering the op amp, I did not fully disconnect all the wire, but enough so I can stand the pcb 90 degrees. Then I de-solder the op amp and solder the sockets in place. after that, the display showed all light up. after messing with the wires, that is checking for cold solder and wiggle them to see if there is any broken pcb solder joint, now the display only show a few light up.
What do you think?
Much appreciated.
The +/- 15V is correct, at least at the opamps
> > Where are the +/- 5v and +/- 15v checking points?
Check your schematics...
> > the display showed all light up. after messing with the wires, that is checking for cold
> > solder and wiggle them to see if there is any broken pcb solder joint, now the display only > > show a few light up.
Which wires? Sometimes you need to make things worse before you can figure out how to make them better. Seems like you did that. I take it that in order to get the board up for the socket swap, you unbolted the rear panel? That's the way I do it to get the transformer out of the way.
I'm trying to recall if there is any wiring to the front panel which is soldered into the PCB? Or is it all connectorized? I recall a pair of brown wires (IIRC) which runs on the case bottom up in front (I remember them because I always have to mess with them to get them to la right when I put the board back in. At any rate, at this point you might just want to redo the solder joints of anything running to the front panel.
When you turn it on, I take it none of the buttons works, etc.? What if you manually put a CD in the tray, and then with the tray in, turn it on? Does it spin, act like it is recognizing it?
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