3dfx Troubleshooting Guide

Possible causes

• Power Connector not connected.
• Power Suppy not working.
• Master GPU defective.
• HINT defective

Solution

• Connect the connector.
• Repair the Power supply.
• Replace master GPU.
• Replace HINT Bridge Chip

Possible causes

• Memories

Solution

• Replace related Memory Chips

Possible causes

• Power supply serously damaged.
• The cause of this catastrophic defect is the aging process in general, and with almost certain probability defective capacitors.
• –

Solution

• This is a serious damage to the card with potentially serious consequential defects. In such a case all components of the power supply must be replaced. Especially all FETs and the controller U509, all diodes, capacitors and the small transistors.

Possible causes

• Power Supply provides not enough power
• Master GPU has died, due to overvoltage.

Solution

• Check DC voltage of 2,8VDC
• Replace Master GPU

Possible causes

• 2,8VDC unreliable, fluctuating
• Strange sound from the power supply coils
• Check 12VDC supply line, terminal lugs
• Check terminal brackets for cracks and bad
  contact to the PCB.
• –
• –

Solution

• Check 2,8VDC for stability
• Check the PWM control signal from the controller to
  see if the duty cycle fluctuates significantly.
• Rework supply device, replace the Molex
  connector.
• Rework solder joints in any case with a good deal
  of heat and flux.

Possible causes

• Power supply too weak
• Power supply works only on one channel
• Check terminal brackets for cracks and bad
  contact to the PCB.
• May one of the secondary GPU’s

Solution

• Check 2,8VDC for stability
• Rework solder joints in any case with a good deal
  of heat and flux.
• Check if all FET’s are working.
• Check reset lines and voltages

Possible causes

• The SC2024 gets no enable signal from AGP port
• The SC2024 has died
• –

Solution

• Check signal at enable pin of SC2024.
• Replace SC2024, you must check all FETs for shorts
  prior carry out the first test.