Author Topic: Pace MBT-350 LCD  (Read 948 times)

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Offline trapc45

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Pace MBT-350 LCD
« on: December 14, 2018, 02:48:07 am »
Has anyone opened up an MBT-350? I need to replace the LCD on mine. You can only see it from the side, about a 40-60 degree angle. Of course the company that touts component level repair tools doesn't offer that as a part. They want to sell you their $700 board which is almost twice what I have in the unit to start with. Looking for a part number for the LCD if anyone has it.
 

Online Shock

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Re: Pace MBT-350 LCD
« Reply #1 on: December 15, 2018, 01:27:25 am »
Did you try changing the display backlight and contrast settings according to the manual?

I can tell the from the color they changed the MBT 350 display a few times, hopefully no pinout differences but otherwise it looks fairly generic. I would take some good photos of the pcb front and rear to post here on the forums and take some measurements to determine pin compatibility compared to datasheets. The image below has the most recent display.

Don't expect manufacturers to carry every individual component as a spare part (it's never going to happen). If you haven't already, email them and ask if they can look up the component part number of the display so you can locate a replacement. This is fairly common request when a PCB replacement is beyond economical repair.


Soldering/Rework: Pace ADS200, Pace MBT350
Multimeters: Fluke 87V, 117, 27/FM
Oscilloscopes: Rigol DS1054Z, Phillips PM3065
 

Offline coromonadalix

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Re: Pace MBT-350 LCD
« Reply #2 on: December 15, 2018, 04:15:48 am »
It seems to be an 2x16  standard lcd ???  on the picture

Can you remove the top case and take some photos  or find any numbers on the lcd itself ??
« Last Edit: December 15, 2018, 04:18:20 am by coromonadalix »
 

Offline trapc45

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Re: Pace MBT-350 LCD
« Reply #3 on: December 17, 2018, 07:03:09 am »
Unfortunately the menu adjustments have no effect. I called to inquire about the part and all they wanted to do was sell me a new board @ $500 US for what should be a $3 part. I was more than a little miffed at the irony of a company that specializes in PCB rework tools took this stance. I agree that it appears to be a vanilla 16x2 LCD. Just trying to confirm if anyone else had already done this repair and had a part number or spec. My luck is it would be some odd voltage or pinout. I guess to the healing bench she goes! It will probably be after Christmas before I get to tear in to her. We are traveling and will be gone for a few weeks. I will post up a PN or spec for posterity once done. NOT looking forward to solder wick and the the old manual sucker to get the thing off. I have become rather fond of vacuum de-soldering.
 

Offline trapc45

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Re: Pace MBT-350 LCD
« Reply #4 on: December 17, 2018, 07:07:30 am »
Unfortunately disassembly will require disconnecting the vacuum assembly which I am certain is going to be a PITA. I am hoping to only have to do that once. I found a used board on fleabay for $350 out of China. The pics on the post weren't very helpful. Just what you would expect the LCD to look like. No pin marking or PNs to be seen.
 

Offline stevelup

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Re: Pace MBT-350 LCD
« Reply #5 on: December 17, 2018, 10:06:13 pm »
I would be absolutely astonished if that display is anything other than a bog standard $3 jobbie with a HD44780 controller.

The pictures I've found suggest that it's the type with a single row header across the top rather than the double row header off to the side.

These are almost always completely interchangeable - the only things to watch out for are that some generate the contrast voltage on board, and others need an external supply. And some have the LED current limiting resistors on board and the display lights up when you connect 5V to it, whereas others need a separate feed for the backlight.

Both will be easy to establish once you've cracked it open.
 

Offline coromonadalix

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Re: Pace MBT-350 LCD
« Reply #6 on: December 17, 2018, 11:28:53 pm »
Maybe sliding the panels a little without dismantling tons of stuff   would help

As stevelup said ...

If it's 1 row or dual row  is a good start

Normally you have 14 (without backlight) or 16 pins header (with backlight)

You can search  HD44780 lcd's,   you will have tons of pinouts available, the only thing left is the contrast adjustment pinout to decipher, maybe an trimpot, an fixed resistor, or simply an short between the pins ?
 

Offline trapc45

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Re: Pace MBT-350 LCD
« Reply #7 on: January 08, 2019, 12:29:47 am »
Thanks for the input gentlemen. I was able to weasle my way to a Pace Enginerd by calling with a rather BS technical question about this model. Once I had him on the line he offered up a source for the display, see the link below. Should be here soon. After I disassembled it (PITA) I decided I am not going to do this with solder wick, so I surfed fleabay for a few weeks and was able to pick up a pretty pristine PPS-400 for $250 and free shipping. Another $70 for a SensaTemp SX-90 (already have tips for the IntelliHeat SX-90 from the MBT-350) and this repair should be a snap. I will let you know how it turns out in a few days. Once again, thanks for the input!

https://www.crystalfontz.com/product/cfah1602btmijt-16x2-character-lcd
 

Online james_s

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Re: Pace MBT-350 LCD
« Reply #8 on: January 08, 2019, 07:20:50 am »
That's a bog standard 44780 type character display, you can buy those all over the place, I don't think I've ever seen one that wasn't interchangeable.

It's possible that the display is fine though, if the contrast adjustment does nothing then I would be more inclined to suspect the circuit that controls the contrast voltage.
 
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Offline trapc45

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Re: Pace MBT-350 LCD
« Reply #9 on: January 14, 2019, 05:29:43 pm »
Thanks for all the replies and input. It is vanilla 16 pin display. The link above is to the OEM part verified upon replacement and suggested as a replacement by a very helpful Pace engineer. replacement was pretty straight forward with one caveat. The power wires to the front panel ON/OFF switch were staked on. I did not fight with them and just disconnected the vacuum/pressure ports and the three connectors to the board. Removed the mounting screws and carefully backed the hand piece connectors out. They are held captive with tabs so you have to compress those and slowly wiggle the three connectors out in unison. Overall an easy repair. I got this unit for a song off fleabay. It was DoD property that was sold off through DRMO based on the paperwork. I suspect it was part of a contingency packout as it had property tags attached, but had never been used. I think the LCD itself had separated some over time and that was the issue. New display is in and everything works great. I never want to be with out a vacuum desolder capability again. I did score a great PPS-400 out of the deal so now I have a back-up station. I might swap it out and use the MBT-350 as a more portable unit since it is smaller and lighter.
 

Online Shock

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Re: Pace MBT-350 LCD
« Reply #10 on: January 14, 2019, 08:54:23 pm »
Good to hear you got it going. You got a PPS-400 as well that is sweet. Should take a photo of it up and running or show your setup in the Show us your soldering setup thread.
Soldering/Rework: Pace ADS200, Pace MBT350
Multimeters: Fluke 87V, 117, 27/FM
Oscilloscopes: Rigol DS1054Z, Phillips PM3065
 
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