Author Topic: EEVblog #808 - Fluke 196 Scopemeter Repair  (Read 18880 times)

0 Members and 1 Guest are viewing this topic.

Offline EEVblog

  • Administrator
  • *****
  • Posts: 29701
  • Country: au
    • EEVblog
EEVblog #808 - Fluke 196 Scopemeter Repair
« on: October 14, 2015, 11:13:03 am »
Dave repairs a dumpster Fluke 196 Scopemeter handheld oscilloscope that has a faulty LCD screen.

How to repair a faulty hot bar LCD screen flat flex cable connection.
Service Manual with full schematics: http://assets.fluke.com/manuals/192_196_smeng0200.pdf

 

Offline BravoV

  • Super Contributor
  • ***
  • Posts: 6109
  • Country: 00
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #1 on: October 14, 2015, 11:52:55 am »
There you go, expecting another big wave of price hike on used scopes with broken lcd.  :palm:

Offline max666

  • Frequent Contributor
  • **
  • Posts: 367
  • Country: at
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #2 on: October 14, 2015, 12:10:51 pm »
So now with the LCD fixed, you could make use of the service manual by fixing the scope input, Dave.
EEVblog #808 - Fluke 196 Scopemeter Repair - Part 2  :)
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 29701
  • Country: au
    • EEVblog
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #3 on: October 14, 2015, 12:11:32 pm »
There you go, expecting another big wave of price hike on used scopes with broken lcd.  :palm:

Holy crap, just checked, membrane keypad for $455!
http://www.ebay.com.au/itm/NEW-FOR-Fluke-192-196-199-Membrane-Keypad-Replacement-523188-/331530524500?hash=item4d30c25754

And as it turns out, this guy repairs this exact fault! Must be common as mud?
http://www.ebay.com.au/itm/Fluke-192-196-199-Scopemeter-LCD-Display-Repair-/230424487426?hash=item35a65ea602

 

Offline BravoV

  • Super Contributor
  • ***
  • Posts: 6109
  • Country: 00
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #4 on: October 14, 2015, 12:14:54 pm »
And as it turns out, this guy repairs this exact fault! Must be common as mud?
http://www.ebay.com.au/itm/Fluke-192-196-199-Scopemeter-LCD-Display-Repair-/230424487426?hash=item35a65ea602

Once he knew or watched your video, he will hate you, just look the number of repairs he sold.  >:D

I guess, this is a good example where you've just made an enemy. LOL

Offline EEVblog

  • Administrator
  • *****
  • Posts: 29701
  • Country: au
    • EEVblog
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #5 on: October 14, 2015, 12:17:17 pm »
Once he knew or watched your video, he will hate you, just look the number of repairs he sold.  >:D

Oh wow, 56!
Says he replaces something though. I don't suspect my repair will be very reliable, I don't trust that conductive adhesive, it came loose for a reason...
 

Offline mux

  • Regular Contributor
  • *
  • Posts: 119
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #6 on: October 14, 2015, 12:42:45 pm »
Pretty much certain that scopemeterrepair.com uses NOS LCDs to replace the existing LCDs. This used to be big business back in the day with lots of standard hitachi graphic LCDs.

You can't really justify the hours spent on such a thing if you can buy OTS identical LCD modules (and maybe an adapter board) for a couple bucks wholesale.
 

Offline Wile E. Coyote

  • Contributor
  • Posts: 7
  • Country: us
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #7 on: October 14, 2015, 01:07:57 pm »
We have the same Fluke 196 in our office. Your rants about Fluke's lack of LCD reparability & support bring back fond memories (Fluke stopped supporting & selling the LCD shortly after we purchased the 196). I think every tech here has had their hand at repairing it with various levels of success. The hot-bar never kept a good connection.

Now we just keep our 196 around as a warning to other Fluke meters should they decide to develop faults. I don't believe any meter should suffer the same fate as our 196.

Although I have to admit, when I saw that you had a repair video for the 196 (and when I peeked at the end of the video and saw the thumbs up), I was hoping you found a solution that we did not think of for a permanent repair! Nope - same Band-Aid repair.

Love the videos & keep up the great work!

-Mike AD0OY

"The bitterness of poor quality lingers long after the sweetness of low price is forgotten"
 

Offline bktemp

  • Super Contributor
  • ***
  • Posts: 1623
  • Country: de
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #8 on: October 14, 2015, 01:19:11 pm »
When repairing hotbar connections, the pressure must be applied until the glue has cooled down.
You can also use a soldering iron set to <200°C with a clean tip for repairing. But you still have the problem applying pressure until the glue has hardened again.

VOGT was a German manufacturer of inductors and transformers. Now it is part of Sumida. Custom built transformers made by VOGT are quite common in all kind of products made in Europe.
Hitachi merged with Mitsubishi and formed Renesas in 2003. That was the end of of Hitachi beeing the most common manufacturer of lcd controllers and drivers.
 

Offline Fungus

  • Super Contributor
  • ***
  • Posts: 9985
  • Country: 00
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #9 on: October 14, 2015, 02:12:38 pm »
When repairing hotbar connections, the pressure must be applied until the glue has cooled down.
That's what I was thinking...

I would have placed a bar of metal (old heatsink, whatever) across the strip using clamps then heat it up and let it cool before releasing.

 

Offline han

  • Frequent Contributor
  • **
  • Posts: 308
  • Country: 00
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #10 on: October 14, 2015, 02:23:42 pm »
Using This one?
 

Offline Fungus

  • Super Contributor
  • ***
  • Posts: 9985
  • Country: 00
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #11 on: October 14, 2015, 02:37:49 pm »
Using This one?

That's perfect! I'll be opening up an eBay repair store in the next few minutes...

 

Offline Ampere

  • Regular Contributor
  • *
  • Posts: 73
  • Country: us
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #12 on: October 14, 2015, 02:50:25 pm »
Excellent repair, Dave.

It's a shame that it's more of a meter than a scopemeter, though. Maybe that would make a good followup video?
 

Offline AF6LJ

  • Supporter
  • ****
  • Posts: 2901
  • Country: us
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #13 on: October 14, 2015, 02:57:39 pm »
Good go at it Dave.
Sue AF6LJ
Test Equipment Addict, And Proud Of It.
 

Offline Dave Turner

  • Frequent Contributor
  • **
  • Posts: 439
  • Country: gb
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #14 on: October 14, 2015, 03:22:59 pm »
I agree with Max66. Please finish the job. Get rid of the EEVBlog curse.
 

Offline noidea

  • Supporter
  • ****
  • Posts: 197
  • Country: au
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #15 on: October 14, 2015, 03:38:12 pm »
Wow Dave what a coincidence, you post a thread on trying to fix a scopemeter and it's the same night that I decide to summon up the courage to take my 196C apart to try and fix it as well.

The problem with mine seemed less drastic than yours the screen works great but it had recently stopped charging and would not operate from the mains adapter, yet still fired up with what was left in the battery (which is new). I must admit I was a bit more hesitant about taking it apart than you are but I fix air conditioners for a living and don't pull electronic stuff apart every day. So far the problem with mine appears minor, the power input connector is knackered as the centre pin has no continuity through the connector to where it goes down onto the PCB in the top corner.

So if you decide not to go ahead with trying to fix the scope section and are going to dump it I'm in Oz too and would happily dispose of the main board for you  :)

I also found something really strange, it appears that the cooling fan on the back of the PCU unit has never been plugged in  :o
I guess I really should start a repair thread on my unit instead of taking yours up.

Cheers
« Last Edit: October 14, 2015, 03:40:12 pm by noidea »
 

Offline free_electron

  • Super Contributor
  • ***
  • Posts: 7218
  • Country: us
    • SiliconValleyGarage
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #16 on: October 14, 2015, 03:42:20 pm »
if the charger doesnt work check out the switching transistor v4102. they fry very easily ... small sot23-6 pin package. obsolete but can be replaced by a fdc666 if you snip off one of the pins. the original transistor has a unique pinout that nobody else uses.

Professional Electron Wrangler.
Any comments, or points of view expressed, are my own and not endorsed , induced or compensated by my employer(s).
 

Offline Supercharged

  • Regular Contributor
  • *
  • Posts: 61
  • Country: ch
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #17 on: October 14, 2015, 04:22:15 pm »
Just a little aside: I think below that bodge cap there is a resistor
Science is about what is, engeneering is about what can be.
-Neil Armstrong
 

Offline Tuomas

  • Contributor
  • Posts: 42
  • Country: fi
    • My random electronics projects
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #18 on: October 14, 2015, 06:23:52 pm »
The university where I studied had one lab with a bunch of those scope meters and every single one of them had those horizontal lines all over the display.

Fluke refused to fix them since they were out of warranty. Apparently the lab doesn't buy Fluke equipment anymore.
 

Offline AF6LJ

  • Supporter
  • ****
  • Posts: 2901
  • Country: us
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #19 on: October 14, 2015, 06:46:08 pm »
The university where I studied had one lab with a bunch of those scope meters and every single one of them had those horizontal lines all over the display.

Fluke refused to fix them since they were out of warranty. Apparently the lab doesn't buy Fluke equipment anymore.
There was a number of displays that used similar technology that had the same reliability problems. A piece of amateur radio gear I own is notorious for the displays developing horizontal lines just after warranty.
Sue AF6LJ
Test Equipment Addict, And Proud Of It.
 

Offline krivx

  • Frequent Contributor
  • **
  • Posts: 763
  • Country: ie
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #20 on: October 14, 2015, 07:38:52 pm »
If anyone is interested, a much longer lasting method for these kind of repairs is to etch away the adhesive and some insulation and solder the cable in place.

http://www.projectvb.com/displayfix.html#Solder
 

Online TheSteve

  • Supporter
  • ****
  • Posts: 2995
  • Country: ca
  • GHz
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #21 on: October 14, 2015, 08:28:14 pm »
Do the various chips that looked like they had a thin heatsink pad on them require heatsinks? Being at least one person has previously tried to fix it they may have removed the heatsinks. Or do the pads make contact with a metal shield when assembled?
VE7FM
 

Offline envisionelec

  • Frequent Contributor
  • **
  • Posts: 259
  • Country: us
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #22 on: October 14, 2015, 08:37:31 pm »
I actually own a hotbar press for the anisotropic adhesive that is used on these things.

It is literally a PID controlled heating element and a machined copper shape attached to a press with a torque-reading gauge for an arm. It was $4000.  :wtf:
 

Offline German_EE

  • Super Contributor
  • ***
  • Posts: 2247
  • Country: de
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #23 on: October 14, 2015, 08:57:19 pm »
There was a number of displays that used similar technology that had the same reliability problems. A piece of amateur radio gear I own is notorious for the displays developing horizontal lines just after warranty.

Let me guess, an Icom IC-756 transceiver
Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.

Warren Buffett
 

Offline Radio Tech

  • Frequent Contributor
  • **
  • Posts: 935
  • Country: us
  • KC4UMO Buddy
    • Hobby Forum
Re: EEVblog #808 - Fluke 196 Scopemeter Repair
« Reply #24 on: October 14, 2015, 09:11:38 pm »
There was a number of displays that used similar technology that had the same reliability problems. A piece of amateur radio gear I own is notorious for the displays developing horizontal lines just after warranty.

Let me guess, an Icom IC-756 transceiver

Same problem with the Kenwood VM-7. Think that model is correct.


Good job Dave. Now fix the scope  :-+


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf