NO DISC DISPLAY WITH CD /DVD PLAYERS
There are mainly three reasons for this fault. The first one is of Damaged Disc. The second one is improper disc loading or disc does not spin inside. The third one is of its laser pickup unit trouble.
To make sure, insert a new disc into the player, and inspect the result. If it does not read this disc, either the disc does not spins inside it, of the laser pickup unit is faulty or dirty.
First, open its top cover, Power ON the set and insert a disc in it. Note
whether the player loads the disc properly into; and disc starts
spins, and the laser pickup unit tries to track the burned tracks on the
CD.
You can see the tracking of
laser pickup unit. The unit will go outward end of the disc first, and
will come back to its original starting position. This process is known as reading. If
disc do not spin inside it, the laser unit can’t track the recordings,
and it will try to read it two or more times again, and will halt at
last. The display will show No Disc.
If the disc do not spins inside the player, make sure that the sled motor has damaged, or it do not get proper voltage. The sled motor in one, which locks up the disc we insert into, with a magnetic catcher. This is a stepper motor, and cost not much. But replacing it is a skilled job, as you have to disassemble and reassemble the while mechanism.
Insert a cleaning disc [which can be bought from most of the electronic spare part selling shops at your town]. Play it for at least 3 times, by taking it ejected out from the player, and reinserting. If
the fault is due to dirt accumulated on the lens of the laser pickup
unit, this process the cleaning disc will clean it up, and your player
will be all right now. If it does not help you, make sure that the laser pickup unit is damaged. When replacing this unit, insist on same type and number of laser unit. Never try to use an other number; sometimes it may not work properly.
When replacing the laser pickup unit, replace the strip wire that goes
from the laser pickup unit to the main board of the player too. This
strip has carbon-conducting tracks, and as it has to go with the
tracking of the laser pickup unit to and fro always when the player is
in use, the carbon conduction patch inside it may get beaked. So it is best to replace this strip along with laser pickup unit.