Compaq LTE5000 series screens

StenPett

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Jul 31, 2019
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Tromsø, Norway
Greetings retro lovers.

I have acquired an old Compaq LTE5000. The base model, with a 75 MHz Pentium, 800 MB HDD, 8 MB RAM (with an added 32 MB expansion card), and (sadly) the 10.4" 800*600 CSTN screen. And herein lies my question: I have found a full screen assembly for sale, with a 10.4" TFT screen, from an LTE5250. Will I be able so exchange the entire assembly, or, failing that, the screen from the 5250 without too much hassle? Are the screens interchangeable?

Thank you in advance
StenPett
Tromsø, Norway
 
May 22, 2019
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From the pictures, it certainly *looks* identical, apart from the single slider on the side, as opposed to my two sliders
What I'd be worried about are the power supply and the driver.

The CSTN and TFT screens use different technology to drive the LCD pixels, and it's possible that the video interface designed for the CSTN might not drive the TFT.

What I'd suggest is trying to track down pinouts for the connectors on both displays to figure out if they carry the same signals and use the same voltages. If they do, there's a better chance the two can be swapped out for each other.
 
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StenPett

New Member
Jul 31, 2019
17
3
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38
Tromsø, Norway
What I'd be worried about are the power supply and the driver.

The CSTN and TFT screens use different technology to drive the LCD pixels, and it's possible that the video interface designed for the CSTN might not drive the TFT.

What I'd suggest is trying to track down pinouts for the connectors on both displays to figure out if they carry the same signals and use the same voltages. If they do, there's a better chance the two can be swapped out for each other.
That's great advice! Thanks! I'll have a good look through the service manuals to see what I can find out.
 

StenPett

New Member
Jul 31, 2019
17
3
3
38
Tromsø, Norway
What I'd be worried about are the power supply and the driver.

The CSTN and TFT screens use different technology to drive the LCD pixels, and it's possible that the video interface designed for the CSTN might not drive the TFT.

What I'd suggest is trying to track down pinouts for the connectors on both displays to figure out if they carry the same signals and use the same voltages. If they do, there's a better chance the two can be swapped out for each other.
That's great advice! Thanks! I'll have a good look through the service manuals to see what I can find out.
 

StenPett

New Member
Jul 31, 2019
17
3
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38
Tromsø, Norway
Okay. Here's a couple of quotes from the service manual I found on archive.org:

Before installing the processor board, verify that the display jumpers are
appropriately configured for the type of display installed in the
computer. The jumper locations are shown in Figure 5-52, and jumper
configurations are presented in Table 5-1.
Table 5-1. Display Configuration Jumpers
===========================================================================
Display Type JP3 JP2 JP4
===========================================================================
LTE 5000 10.4 in VGA CSTN 1-2 2-3 1-2
LTE 5000 10.4 in VGA CTFT 2-3 2-3 1-2
LTE 5000 11.3 in SVGA CSTN 1-2 2-3 2-3
LTE 5100 10.4 in SVGA CTFT 2-3 2-3 2-3
LTE 5150 Rev. 4.X * 11.3 in SVGA CSTN 1-2 1-2 1-2
LTE 5150 Rev. 2.X * 11.3 in SVGA CSTN 2-3 1-2 1-2
LTE 5200 10.4 in SVGA CTFT 2-3 2-3 2-3
LTE 5250 10.4 in SVGA CTFT 2-3 2-3 2-3
LTE 5280 11.3 in SVGA CTFT 2-3 2-3 2-3
LTE 5300 12.1 in SVGA CTFT 2-3 2-3 2-3
LTE 5380 12.1 in 1024x768 CTFT 2-3 1-2 1-2
LTE 5400 12.1 in 1024x768 CTFT 2-3 2-3 2-3
---------------------------------------------------------------------------
* Verify the display panel revision number by checking the printed number
on the large ferrite bead on the display cable. The display cable is
located on the left side of the display assembly.
===========================================================================
So, looking at this, it would seem that all the processor boards support all the different displays, and one would simply move a few jumpers around to tell it which display is connected. One completely different question is if the different display assemblies would fit the different models, as I couldn't find any reference either way.
 
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