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UNI-T Bench Multimeter
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JD  
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 More options Feb 8, 8:23 pm
Newsgroups: aus.electronics
From: JD <jed...@bigpond.net.au>
Date: Thu, 09 Feb 2012 11:53:46 +1030
Local: Wed, Feb 8 2012 8:23 pm
Subject: UNI-T Bench Multimeter
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I have a UNI-T bench multimeter (UT804) purchased 2 years ago on eBay
that has developed an annoying random 'flashing' display back-light. I
have been in contact with UNI-T and they suggest returning it to their
factory in China as they have no authorised UNI-T service agent in
Australia.

Minimum cost is postage both ways plus USD$100.

I would have a go at repairs myself but cannot locate a schematic for it.

Any suggestions?

JD


 
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Trevor Wilson  
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 More options Feb 9, 12:59 am
Newsgroups: aus.electronics
From: Trevor Wilson <tre...@SPAMBLOCKrageaudio.com.au>
Date: Thu, 09 Feb 2012 16:59:27 +1100
Local: Thurs, Feb 9 2012 12:59 am
Subject: Re: UNI-T Bench Multimeter
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On 2/9/2012 12:23 PM, JD wrote:

> I have a UNI-T bench multimeter (UT804) purchased 2 years ago on eBay
> that has developed an annoying random 'flashing' display back-light. I
> have been in contact with UNI-T and they suggest returning it to their
> factory in China as they have no authorised UNI-T service agent in
> Australia.

> Minimum cost is postage both ways plus USD$100.

> I would have a go at repairs myself but cannot locate a schematic for it.

> Any suggestions?

> JD

**Is the backlighting an EL (Electroluminescent) panel?

If so, you're pretty much screwed. It will either be the panel, or the
high Voltage inverter. The inverter is easy enough to trouble-shoot, but
the panel, if faulty, is a whole 'nuther can of worms. The other option
is that the backlighting may be LED. If that's the case, you should be
able to figure it out.

--
Trevor Wilson www.rageaudio.com.au


 
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JD  
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 More options Feb 9, 10:00 pm
Newsgroups: aus.electronics
From: JD <jed...@bigpond.net.au>
Date: Fri, 10 Feb 2012 13:30:39 +1030
Local: Thurs, Feb 9 2012 10:00 pm
Subject: Re: UNI-T Bench Multimeter
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On 9/02/2012 4:29 PM, Trevor Wilson wrote:

Hi Trevor,

Thanks for your reply.
Display is very light blue and is edge-lit on left hand side edge only,
so I suspect is LED?

In between flashes of the screen the display looks like a stock standard
LED display - black lettering on a grey background.

It is a long shot but I will contact UNI-T again and see if they will
send me a schematic.

Problem in the past when contacting them is that they wont give me an
email address for a techo in their company. Stock answer - if it's
faulty send it back. Most annoying!

JD


 
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