Hi
My friend had the player hooked up to the wall and on standby when a big electrical storm hit.
The player showed no signs of life and after some measuring we figured the main toroid had copped it, no winding resistance from the common terminal to either the 110 or the 230V windings.
CA sent over a (pricey!) new transformer and we fired it up and it seemed to work OK. We were having a bit of an issue with the front panel buttons but we put that down to the age of the player and the humidity (always >75%) causing the switches to go bust.
Anywho, we shut the lid, hooked it up to an amp and got no sound from either channel. The digital output was then tested and found working, but the analog wouldn't play anything.
I started poking around a bit on the board, removing the I2S connection to see if that changed anything, probed around with a analog signal probe, and the right channel came to life. Left channel still dead as a dodo, and shows 1.25-1.35VDC on its outputs (as opposed to 2.5V as is expected, and measured on the right channel). The Vregs for Vd and Va are steady at 5V, but run very, very hot - much hotter than the working channel. And the area above the chip is also quite toasty but nothing burning and nothing stinking.
We've ordered a replacement DAC (which is as of now the prime suspect) and will be getting some more 1N4148s which we snipped off while testing (in case they had blown junctions and were overloading the output), but really was looking at anything else I can test/do before we take the drastic step of replacing the DAC chip. As far as I can tell from the schematics the DAC is being used in hardware mode and has no logic connection to the servo, but I couldn't be sure.
Full manual is available here: http://www.elektroda.pl/rtvforum/download.php?id=514397
My friend had the player hooked up to the wall and on standby when a big electrical storm hit.
The player showed no signs of life and after some measuring we figured the main toroid had copped it, no winding resistance from the common terminal to either the 110 or the 230V windings.
CA sent over a (pricey!) new transformer and we fired it up and it seemed to work OK. We were having a bit of an issue with the front panel buttons but we put that down to the age of the player and the humidity (always >75%) causing the switches to go bust.
Anywho, we shut the lid, hooked it up to an amp and got no sound from either channel. The digital output was then tested and found working, but the analog wouldn't play anything.
I started poking around a bit on the board, removing the I2S connection to see if that changed anything, probed around with a analog signal probe, and the right channel came to life. Left channel still dead as a dodo, and shows 1.25-1.35VDC on its outputs (as opposed to 2.5V as is expected, and measured on the right channel). The Vregs for Vd and Va are steady at 5V, but run very, very hot - much hotter than the working channel. And the area above the chip is also quite toasty but nothing burning and nothing stinking.
An externally hosted image should be here but it was not working when we last tested it.
We've ordered a replacement DAC (which is as of now the prime suspect) and will be getting some more 1N4148s which we snipped off while testing (in case they had blown junctions and were overloading the output), but really was looking at anything else I can test/do before we take the drastic step of replacing the DAC chip. As far as I can tell from the schematics the DAC is being used in hardware mode and has no logic connection to the servo, but I couldn't be sure.
Full manual is available here: http://www.elektroda.pl/rtvforum/download.php?id=514397