Tektronix TDS3034B Display Failure - Page 1
Forum section: electronics / repair

author: fchk
author_rank: Frequent Contributor
timestamp: December 06, 2018, 09:43:57 am
content: Hi.I switched on my old TDS3034B scope, but the LCD display failed. VGA output is fine, and the scope seems to work fine otherwise.The display only shows horizontal and vertical lines. I haven't opened the device, but I assume that a flex cable is either broken, or the connection between flex cable and lcd glass has gone bad. Backlight is still fine.I guess it is next to impossible to repair a bad lcd module, so I'll need a replacement.Where do I get a replacement screen for my scope?Frank-Christian

author: coromonadalix
author_rank: Super Contributor
timestamp: December 06, 2018, 10:57:15 am
content: maybe you can find a part number if you dismantle the lcd assembly and search for any part number written on it ?The only link ive found :https://www.aliexpress.com/item/Original-lcd-display-LCD-panel-for-Tektronix-TDS3000-oscilloscope-TDS3012-TDS3014B-TDS3032-TDS3054B-TDS3032B-TDS3034B-Series/1917885574.html350$ usd outch, must be substitutes somewhere ?I know there was succesful attemps to put an lcd / tft monitor in some scopes with great success ?specs in service manual :https://www.atecorp.com/atecorp/media/pdfs/data-sheets/tektronix-tds3000_series_manual.pdfhttp://www.pewa.de/DATENBLATT/DBL_TEK_TDS3000-SERVICE-MANUAL_ENGLISCH.PDFpart number 65blm04 ??LCD, COLOR, 640X480, 6.5 inch DIAG,TFT, 6--BIT, 0.2MM PIXEL PITCH

author: fchk
author_rank: Frequent Contributor
timestamp: December 08, 2018, 03:52:04 pm
content: I've nade some progress.A youtube video showed another type of display for this series of machines - a NEC NL6448BC20-08. I found a datasheet for this and managed to buy an NL6448BC20-08E (the added letter shoud not matter) for 60 Pounds off ebay.I'm just waiting for this thing to arrive.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 08, 2018, 04:59:47 pm
content: Hope it works for you

author: fchk
author_rank: Frequent Contributor
timestamp: December 25, 2018, 07:28:39 pm
content: Yes, works again. Problem solved.

author: cncjerry
author_rank: Unknown
timestamp: December 26, 2018, 03:50:32 am
content: Is that the same, drop-in display? For that price I'll stop trying to save my display by turning down the brightness all the time.Good job!Jerry

author: fchk
author_rank: Frequent Contributor
timestamp: December 27, 2018, 12:10:16 pm
content: Quote from: cncjerry on December 26, 2018, 03:50:32 amNearly.The original display was a NEC NL6448BC20-08, the new one is a NEC NL6448BC20-08E.The datasheet says:"Comparison table of NL6448BC20-08E and NL6448BC20-08ItemNL6448BC20-08ENL6448BC20-08Haze16%12%"There was a cover screen glued onto the display with double-sided sticky foam tape. I didn't transfer this to the new lcd, and so there is a 3mm gap between display and front bezel. I don't care about that.You need to reuse the inverter board and the display cable.just another idea: The ccfl tubes seem to be accessibly easy. If they are going dark it might be enough to replace them with strips of white LEDs.fchkPS:I don't know where you are located, but you could have a look at ebay #123530231897. You'll even get a new inverter board. The product description is wrong, though.

author: gamalot
author_rank: Super Contributor
timestamp: December 27, 2018, 12:35:03 pm
content: You forgot to upgrade your oscilloscope to a high-end model 3054B or 3064B.

author: fchk
author_rank: Frequent Contributor
timestamp: December 27, 2018, 02:59:01 pm
content: Quote from: gamalot on December 27, 2018, 12:35:03 pmI didn't know this is possible? Do you have a link?

author: gamalot
author_rank: Super Contributor
timestamp: December 27, 2018, 04:26:53 pm
content: Quote from: fchk on December 27, 2018, 02:59:01 pmhttps://www.eevblog.com/forum/testgear/tds-1000-2000-3000-bw-hack/msg1257134/#msg1257134

author: fchk
author_rank: Frequent Contributor
timestamp: December 27, 2018, 06:02:31 pm
content: Thanks. Done.

author: jmelson
author_rank: Super Contributor
timestamp: December 27, 2018, 09:57:04 pm
content: Open the scope (You'll have to look up online how to open these, OBVIOUSLY made to frustrate anybody to get inside) and reseat all connectors, especially from power supply board to main board. We have a bunch of TDS scopes and have to do this every couple years.Jon