monitor repair TECH

[John Bennett]

[ukvac] monitor repair TECH
I hope someone can help;

My Jamma monitor has ceased to work, now when it is turned on it remains
blank - but when i turn it off a white dot appears then fades out quickly. A
friend suggested it might be a frame collapse? (someone else reckoned the
tube had blown).

Do either of these diagnoses sound correct?
Could a normal TV repair shop fix the monitor?
If its totally knackered where is a good place to get a replacement monitor?
(there never seems to be any on ebay)

I am a complete monitor novice i`m afraid, thanks in advance for any answers
to the above,
Dugan.



DATA Imported from archives: originally posted by Dugan Jackson (Djackson@igl.co.uk)

 

[galaxip79]

Re: [ukvac] monitor repair TECH
> I hope someone can help;
>
> My Jamma monitor has ceased to work, now when it is turned on it remains
> blank - but when i turn it off a white dot appears then fades out quickly. A
> friend suggested it might be a frame collapse? (someone else reckoned the
> tube had blown).
>
> Do either of these diagnoses sound correct?
> Could a normal TV repair shop fix the monitor?
> If its totally knackered where is a good place to get a replacement monitor?
> (there never seems to be any on ebay)

A collapse to a white dot usually signifies a lack of HV (more often than
not), which in turn usually means the LOPT/FlyBack has blown - is the
dot really really bright before it goes? The xray prtection circuit
could be kicking in, explaining why it fades out quickly, which could
indicate voltage problems around the chassis (the xray circuit won't
kick in for a screen that's virtually all black, as when there's a black
screen, there's virtually no xray radiation being generated)

It needs a monitor repair bod to fix, I doubt a TV repair engineer
would have the parts to repair, although he'd have the know how.

2 choices then (assuming you don't want to do it yourself)

1) Send it to a repair specialist, like Namco
2) Take a risk on diagnosis and buy the spares and talk a tv repair bod
into fitting them

I'd recommend 1)

Of course, depending on the type/age of the monitor, it may well be
cheaper just getting another monitor chassis or if you can find one
really cheap, another cab.

The tube WON'T have blown, btw, so keep it for sparesif you get
another cab!

If you want more info, mail me off list.

G

--
_ _ _a' /( <. # Gaz Wilson, aka DragonLord
/_/ _ _/ / ` / _ ~~ _} ( _ ) # E-Mail: dragon@nightwolf.org.uk
/ /_'/_/ /_, / /_||/|/ (,_(,)' # Info: www.dragons.org.uk/redclaw.html
Catch me with the Dragons. ._>, _>, # Chat: http://www.redclaw.org.uk/

 

[andrewhannay]

RE: [ukvac] monitor repair TECH
Is it Hanterax?
If so 900 or 9000
Andrew

> My Jamma monitor has ceased to work, now when it is turned on
> it remains
> blank - but when i turn it off a white dot appears then fades
> out quickly. A

 

[galaxip79]

Re: [ukvac] monitor repair TECH
Sorry for the self-reply

>
> A collapse to a white dot usually signifies a lack of HV (more often than
> not), which in turn usually means the LOPT/FlyBack has blown - is the
> dot really really bright before it goes? The xray prtection circuit
> could be kicking in, explaining why it fades out quickly,

(and why the screen is blank when on (didn't read the problem properly -
thought it was white dot on switch on, not switch off))

Also forgot the important bit: You'll have to take the chassis out
in either case, which means discharging many kilovolts of leccy, which
is DANGEROUS!!!! Read up on monitor discharging before you do ANYTHING!

G

--
_ _ _a' /( <. # Gaz Wilson, aka DragonLord
/_/ _ _/ / ` / _ ~~ _} ( _ ) # E-Mail: dragon@nightwolf.org.uk
/ /_'/_/ /_, / /_||/|/ (,_(,)' # Info: www.dragons.org.uk/redclaw.html
Catch me with the Dragons. ._>, _>, # Chat: http://www.redclaw.org.uk/

 

[LukeWells]

Re: [ukvac] monitor repair TECH
First thing .....

turn the brightness to full (see if you are getting raster at all) I had a
monitor that I thought was dead, but apon turning the brightness up i
discovered there was raster and it was the video input signal that was at
fault

Luke