Zenith SuperSport 286e

Resources

Wiki
Vintage Computing and Gaming
ZDS Parts (archive)

I have not found any user nor service manual. If you have one, please let me know.

Internals

Motherboard

Pressing ESC during boot enters MFM-200 command line debugger that is contained in ROM. BIOS settings can be changed with SETUP command.

Display

LCD

Display Controls

Backlight

Power Supply

Keyboard

Floppy Disk Drive

Hard Disk Drive

My Supersport came without any HDD. I tried installing Compact Flash IDE drive emulator, but it did not work – it caused the display to be malformed. What works fine with this machine is a commonly available SD card IDE drive emulator. No tricks are needed, just connect it as use as an internal hard drive.

Reassembly

Fixing Backlight CCFL on ZenIth SuperSport 286e

Display backlight was broken on my machine. The power supply module located in the laptop base is responsible for producing the voltage for the CCFL lamp in the display. A transformer that was part of that circuit was damaged. CCFL is served by an integrated hybrid circuit called TSHIC-CCFL2. This chip produces waveforms for T301 transformer, which secondary winding is connected directly to the CCFL lamp. TSHIC-CCFL2 circuit is powered by +12V from the power supply and is enabled by +5V signal fed from the motherboard through Q301 transistor. Additionally, the brightness potentiometer in the display base is connected to the circuit for backlight brightness control.

The CCFL circuit can be replaced by a modern universal laptop or monitor inverter board, for example GYT-DK0205.

Original TSHIC-CCFL2 and T301 as well as Q301 can be removed from the power supply board.

The inverter board can be connected to the +12 and GND pins of former TSHIC-CCFL2 and directly to +5V control pin on the motherboard connector. The brightness control can be probably also adjusted to the new board, but I have not tried to do that. Connecting the brightness pin on my inverter board to ground makes it work on highest settings and I see no reason to adjust it.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s