Lecroy 9354tm CRT to LCD update - Page 1
Forum section: electronics / testgear

author: iopq
author_rank: Contributor
timestamp: January 23, 2021, 01:44:58 am
content: Hello. I want to replace CRT on LCD. The monitor motherboard have pin marker - H, V, S signal. What is interface? How can I do it?

author: coromonadalix
author_rank: Super Contributor
timestamp: January 23, 2021, 12:56:49 pm
content: Without a schematic you have to do some detective workMaybe someone here has done a modtime will tell, be patientNormally on Ebay aliexpress you have lcd interface boards, some of them accept ntsc pal, r g b, video inputsh = horizontal signalv = vertical signals =syncSometimes you have to combine/ re combine the signal into a composite one (rebuild the signal adding the vert/horiz components)once you have the video signal you can apply it to the lcd interface.Do you have a scope on hand to know witch frequencies are the H,V,S pinouts ?

author: coromonadalix
author_rank: Super Contributor
timestamp: January 23, 2021, 01:04:27 pm
content: maybe this group can help ?https://groups.io/g/LeCroyOwnersGroup/topic/93xx_lcd_crt_replacement/5479331?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,0,0,5479331LeCroyOwnersGroup@groups.ioThere's a reference to someone on yahoo group / place who apparently done itother says its not possible ?another discussionhttps://groups.io/g/LeCroyOwnersGroup/topic/989827other thread ?https://www.badcaps.net/forum/showthread.php?t=58928EDIT found a document of some tests with an email link ...

author: coromonadalix
author_rank: Super Contributor
timestamp: January 23, 2021, 01:23:14 pm
content: Annnnnd a service manualhttps://www.opweb.de/english/company/LeCroy/9354TMor this well known sitehttp://www.ko4bb.com/getsimple/index.php?id=download&file=LeCroy/LeCroy_9354A-M-L-TM_Service_Manual_Complete.pdfThey are the same manuals, on page 8-192I see an video signal pin with a R1 who is a 75 ohms load, that should be the right signal for you ... but be careful not to overload this pin or use a capacitor to couple the signal .... or the lcd interface will be okay, chop an rca male cable to do the connectionCheck the crt video resolutions and adapt it to an lcd interface, you may get some black bars on the sides, you'll have to fit a nearby resolution, or slightly stretch the displayed video with the horizontal / vertical size if the lcd interface have them, some fiddling i may say.good luck

author: iopq
author_rank: Contributor
timestamp: January 23, 2021, 01:39:28 pm
content: thank you for your answer. yes i have the logical analyzer. i try to get it some later.sorry for my very badly English.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 23, 2021, 01:44:37 pm
content: just corrected my previous post before your answer loll

author: iopq
author_rank: Contributor
timestamp: January 25, 2021, 05:37:43 pm
content: hello. i get log -" alt="" class="bbc_img" />

author: Arhigos
author_rank: Regular Contributor
timestamp: January 26, 2021, 12:06:38 am
content: I have done it with my lecroy LS140 simply by using rear VGA connector and small VGA monitor from ebay. Yours should have VGA output or room for graphics card

author: iopq
author_rank: Contributor
timestamp: January 26, 2021, 12:46:44 am
content: I don’t have connector vga. Probably I can insert graphics card but I don’t have it. I want buy small lcd and connect with oscilloscopeIt do you mean ? Very simple decision

author: Arhigos
author_rank: Regular Contributor
timestamp: January 26, 2021, 05:18:35 am
content: This connector looks like VGA.. Have you checked it?

author: james_s
author_rank: Super Contributor
timestamp: January 26, 2021, 07:02:46 am
content: Is there something wrong with the CRT? Unless the tube or LOPT is dead it's usually more trouble than it's worth to try to retrofit it.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 26, 2021, 11:53:41 am
content: hum seems like a vga cable or at least an video input, refer to the schematics, the crt assembly is a complete encased module, it should be doable to mod this into a lcd ??page 4-17 section 4.8.2 up to section 4.8.6 you have some description and working frequencies for the crt sectionYou will have to open your scope and show us the inside photo, we can not guess everything .... you have to help us, show us where the video cable are connecting and the pcboard numberI searched the manual and can not easily find the interconnection pcb between the video/crt or the scopeEDITyour connector is J6 on the cpu card, its a 14 pins connector, the schematic is page 8-10, written next to it is 9300-2 boardyou have the hsync, vsync, and an intensity pins, and a +15vdc and -15vdc, the intensity is driven by the cpu card, must be a variable voltage not sure ??This project is not for someone who doesn't have electronic experience, it may go wrong and blow the cpu card if you're not carefulBUTYou still have an complete video signal on the crt control board R1 and C1 page 8-192I would try this first, i would not play with the other connector j6

author: iopq
author_rank: Contributor
timestamp: January 29, 2021, 07:20:36 pm
content: it's very difficult. i thought that it standard interface. im find the filehttps://www.dropbox.com/s/65sjya6dnqquc0f/LeCroy%20LCD%20Install.pdf?dl=0https://www.dropbox.com/s/x9swoom1iipqdyv/LeCroy_lcd2_full.pdf?dl=0somebody do it using microcontrollerin all right. my CRT in perfectly condition.