Today’s teardown a Regent DVD player manufactured in January 2005.
The Regent brand is not a prestigious brand. A the top load mechanism, basic controls and composite video (Or S-Video) output make it a very basic DVD player.
No HDMI output. HDMI started to appear on consumer TV’s in 2004, so it was already common, but might have been a bit early for it to appear on low end models.
On the base of the unit are several labels, one of them states “Apparatus Claims of US Patent Nos 6,631603 ..” (And three other patents). The four patents are all assigned to Macrovision and relate to a method to prevent a video recording by VCR while still viewable on a TV.
Opening the unit up and the layout is very modular
A conventional power supply board (With step-down transformer and bridge rectifier) housing the control buttons (that go straight to a connector) on the left. The main board on the right covered with a metal RF shield that also doubles as a heatsink for two ic’s. In the centre attached to the upper part is the read head sled and DVD motor. The composite video connectors have their own mini PCB as do the status LEDs.
This is the DVD motor drive and read head (Front and Back) I was a little surprised that the read sled is driven via a standard motor with gearing gogs rather than directly by a stepper motor, again another indication this was a cheap model.
This is the main PCB The large chip ESS Vibratto II is a single chip DVD solution, surrounded by some RAM and Flash memory. The second ESS chip (6603) is the RF amplifier connected to the DVD read head. The large die is a 0.13 μm digital die, I chose to look at some of the peripheral chips to take die photos of.
In the top left of the board is the Amtek AM5868S which is a multi-channel motor driver for the DVD spindle and the read sled positioning motors.
The four repeated blocks are very obvious (4x spindle driver and 4x sled driver discussed in the datasheet).
Princeton Technology Corp. PT8211
Here is the block diagram from the datasheet And here is the (1.86 x 1.33 mm) die
You can clearly see from left to right the digital latch circuit, the resistor network in the centre next to the binary weighted elements of each channel. The analog signal from the left and right channels go to an op amp, buffering the output (According to application notes.)
Texas Instrument R4558
On the board is a TI RC4558 a dual general purpose op-amp ideal for voltage follower applications.
I decapped the chip and here is the small (1.4mm x 1.13mm) op-amp high resolution die photo.
Its a simple circuit and quite interesting to look at, with one unusual feature. I have now looked at lots of Texas Instruments die and this is the first one I have seen that does not feature the TI logo.