Tweet
-
Bought a used xlt off of ebay and turns out it had a bad display . Picked up a replacement screen from another ebay vendor and installed it but it seems inoperable . I did the usual repair steps of removing ac converter and soldering in 2 new 6.8khz resistors and also tapped in the 5v 2 wire backlight power harness . Switch the machine on I get the usual power up tones and I checked number 1 and 2 pins on the display pcb and I have 5v there . I also applied 5v to the backlight and it came on as expected . But I get no display at all when turning the machine on . I am puzzled . The vendor did admit it was a used screen and had not been tested and did refund my money after I contacted him about the issues . Any ideas on why the display won't power up ? All the cable connections and plugins seem secure . I am including a couple pics .
Last edited by ric44; 02-26-2026, 12:30 PM. -
I also have an XLT with faulty display
i am not using it for some time but i would like to get it fixed.
i wonder if you have the part number of the original display and the part number of the replacement you bought from ebay -
Comment
-
Played around a little this morning with the display and a multimeter and I'm thinking I may have found the problem with it . Several of the smd capacitors showed no values and I found one that was open ( marked CF on the board ). Anyhow I got a couple of new LCD's on the way .Comment
-
i was looking for the original part number and the part number of the replacement that was sold as direct replacement.Originally posted by pito View Post
an 128x64 LCD if i remember well it physically larger than the originalComment
-
... .....Comment
-
There is no direct replacement . They were gone long ago . They operated on AC current instead of DC via a converter . The replacement lcd's are 5v DC and are a thicker unit making it necessary to trim the case mounting bosses back to accomodate the extra width . Google replacing the XLT display . It opens up a whole new can of worms . The driver board it sits on has to be modified . It is an involved process and I have found nothing online that shows a step by step process . There are those that make money selling and replacing the displays and are seemingly reluctant to outline the process for the DIY'er . Maybe someone here has pics and can detail the process . If so post up . It would help a lot of people .Originally posted by nickel_n View PostComment
-
the same size and pinsOriginally posted by ric44 View Post
https://www.google.com/search?q=wg12...koIEAIYAiACKAI
Installation: It is generally a direct drop-in replacement for the original display module, though proper soldering and, in some cases, adjustment of the contrast potentiometer may be required
https://www.aliexpress.com/item/1005...003436704_1Comment
-
It's still thicker than the original and it still requires modifications and soldering skills to both it and the driver board . It's no drop in .Originally posted by pito View Post
the same size and pins
https://www.google.com/search?q=wg12...koIEAIYAiACKAI
Installation: It is generally a direct drop-in replacement for the original display module, though proper soldering and, in some cases, adjustment of the contrast potentiometer may be required
https://www.aliexpress.com/item/1005...003436704_1Comment
-
Well back to the XLT display problems . This morning I put the suspect replacement display module on a breadboard and connected grounds and power to the appropriate pinouts . To my surprise the screen came on complete with a blue border and a working backlight . This has me thinking my problem may lie with the driver board the display plugs in to . I'd be completely lost trying to figure out component failure on the driver board and am going to try and search out the complete board . I have already converted this board with the resistor mods for the new display . Will the be a compatible driver board available for this application ? I've included a pic of the original one . PS The thing is I did have a working display besides the missing segments before doing the mods .I'm bumfuzzeled .
Comment
-
could be that you had a bad connection somewhere
why don't you get a contact cleaner spray and clean all contacts on both boards.
make sure that you get a spay with NO oilComment
-
-
Show the picture how LCD is connected to main board.Comment
-
-
Old PCB = there can be invisible corrosion on soldering points of the connector, resolder them.
How LCD was dying, slowly each day getting worse or rapidly = on one day ok on next day dead ?
Comment
Comment