Service Home SKBIF / LCD Monitor - Troubleshooting Guide - CHC
Last updated: 06/26/2025

SKBIF / LCD Monitor - Troubleshooting Guide - CHC

Applies to machines built from: January, 2003 to January, 2015

Introduction

Differential receiver PCB [1].

SKBIF PCB [2].

Symptom Table

Symptom Possible Cause Corrective Action
The LCD monitor shows flashing red, green, blue and black colors, or is solid white. Problem with the cables. Make sure the connections are fully seated.
The LCD monitor does not have video. Problem with the voltage to the backlight. Make sure the SKBIF PCB and differential receiver card have the correct voltage.
Problem with the backlight. Test the backlight.
Display off timer or screen saver delay are not resetting properly. Reset settings 100 and 199.
The Image on the LCD Display is Grainy. The dip switches on the Differential receiver PCB or SKIBF PCB are set incorrectly. Make sure the dip switches are set correctly, see section below.
The Machine Display Shows a Multiple-Color "Confetti" Image Problem with the cables or processor pcb. Make sure the connections are fully seated.
Upgraded the CRT monitor to LCD:  When I cycle the power the monitor settings are “forgotten”. The monitor is defective. Take a picture of the manufacture name, serial number and build code and contact the Haas Service Department. 

Cable Connections

Corrective Action:

10" LCD Monitors: Make sure that the video data cable from the J2 connector on the video PCB to the J3 connector on the differential receiver PCB is correctly connected.

15" LCD Monitors: Make sure that the video data cable from the J10 connector on the processor PCB to the J6 connector on the SKBIF PCB is correctly connected.

Make sure the video data cable from connector J16 on the SKBIF PCB or J4A on the differential receiver PCB to the LCD monitor is correctly connected.

Make sure the backlight cable from connector J13 on the SKBIF PCB or J2 on the differential receiver PCB is correctly connected.

SKBIF

Corrective Action:

If there is voltage present, the LCD monitor has failed and must be replaced. If there is no voltage present or is low, check the power supply to the SKBIF PCB or differential receiver PCB.

10" LCD Monitors: Make sure the differential receiver PCB has 12 VDC. Measure the voltage at the P1 [1] connector. Measure the voltage across GND and +12 V.

15" LCD Monitors: The SKBIF PCB generates +3.3Vdc, +5Vdc. Check these voltages at the following test points (TP).

  • Put the black probe at TP11 (GND) [1] and the red probe at TP16 (+3.3Vdc) [2] you should measure approximately +3.3Vdc.
  • Put the black probe at TP11 (GND) [1] and the red probe at TP12 (+5Vdc) [4] you should measure approximately +5Vdc.
  • Put the black probe at TP11 (GND) [1] and the red probe at TP18 (+12Vdc) [3] you should measure approximately +12Vdc.

 

Backlight

Corrective Action:

With the machine powered on, point a light at the LCD monitor. If you can see the information on the display, the backlight has failed. Replace the LCD monitor.

Display Timer

Corrective Action:

Setting 199, Display off timer, or Setting 100 Screen saver delay, are not resetting properly. Change Settings 100 and 199 to 0.

If this resolves the symptom, contact your local HFO to update your machine software.

Dip Switch

Find the switches that have the label S1 or SW2 on the Differential receiver or SKIBF PCB.

Set the COLOR switch to the left position. And set the STROBE switch to the right position.