Author Topic: GX4000 Display issues blurry  (Read 640 times)

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Offline Turboman

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GX4000 Display issues blurry
« on: 06:08, 17 April 18 »
This is my first time using a GX4000, I am using a replacement 9V 1A power supply. The issue I have is the screen is really blurry and washed out looking. I tried using a scart cable into the OSSC, Open Source Scan Converter and then I tired a scart  to RCA cable into a HDMI converter. I tried two different LCD TVs. Any ideas on what I need to do? is my GX4000 defective?
These are links to the cables that I purchased.

https://www.amazon.com/KabelDirekt-multiple-shieldings-precision-connector/dp/B01DYEN1NQ/ref=sr_1_3?ie=UTF8&qid=1523934395&sr=8-3&keywords=scart+cable

https://www.ebay.com/itm/12ft-4m-Tripple-Shielded-RCA-SCART-TO-AUDIO-VIDEO-Cable-with-IN-OUT-Switch/221047407992?hash=item337773c578:g:~-0AAOxyl5lSHtTd

Here are some links to pictures of the screen. My camera makes it looks better then it actually is.

http://i1156.photobucket.com/albums/p580/ThunderMega93/GX4000/20180416_143909_zps7jiozqzd.jpg

http://i1156.photobucket.com/albums/p580/ThunderMega93/GX4000/20180416_143824_zpswwcypdxu.jpg

http://i1156.photobucket.com/albums/p580/ThunderMega93/GX4000/20180416_143814_zpsrttopnl6.jpg

http://i1156.photobucket.com/albums/p580/ThunderMega93/GX4000/20180331_143857_zps0zc40uyw.jpg

http://i1156.photobucket.com/albums/p580/ThunderMega93/GX4000/20180331_143827_zpsxpvrjfxh.jpg
« Last Edit: 06:10, 17 April 18 by Turboman »

Offline ||C|-|E||

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Re: GX4000 Display issues blurry
« Reply #1 on: 12:39, 18 April 18 »
Could you post a picture?

Offline gerald

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Re: GX4000 Display issues blurry
« Reply #2 on: 18:18, 18 April 18 »
Could you post a picture?
With the 5 he already posted, I suspect that you're slightly blind  ;D

This is my first time using a GX4000, I am using a replacement 9V 1A power supply. The issue I have is the screen is really blurry and washed out looking. I tried using a scart cable into the OSSC, Open Source Scan Converter and then I tired a scart  to RCA cable into a HDMI converter. I tried two different LCD TVs. Any ideas on what I need to do? is my GX4000 defective?
The SCART provides RGB and Composite PAL. My guess is that you are using the composite output instead of the RGB one.
There is no way to check that the 1st cable is fully wired, the description does not state it. The second one is definitively a composite one.


Offline ||C|-|E||

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Re: GX4000 Display issues blurry
« Reply #3 on: 12:49, 19 April 18 »
Hahaha, sorry, I checked the post in my phone and I could not see them!!  :picard2:

Offline dragon

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Re: GX4000 Display issues blurry
« Reply #4 on: 14:39, 19 April 18 »
I have returned one new because these problem. Probably a problem with the dac ic.

Offline Bryce

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Re: GX4000 Display issues blurry
« Reply #5 on: 15:04, 19 April 18 »
The picture quality is exactly what I would expect from the setup you describe.

You are going from RGB (best picture quality from CPC) and then converting down to composite (worst picture quality). A HDMI converter won't magically improve the image after it has been brought down to composite, you need a setup that remains at RGB and then converts to whatever your TV offers (other than composite).

Bryce.

Offline Turboman

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Re: GX4000 Display issues blurry
« Reply #6 on: 02:56, 20 April 18 »

The SCART provides RGB and Composite PAL. My guess is that you are using the composite output instead of the RGB one.
There is no way to check that the 1st cable is fully wired, the description does not state it. The second one is definitively a composite one.

Do you know where I can purchase a properly wired cable? or a cable for the 8 pin output?

Offline Turboman

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Re: GX4000 Display issues blurry
« Reply #7 on: 02:57, 20 April 18 »
The picture quality is exactly what I would expect from the setup you describe.

You are going from RGB (best picture quality from CPC) and then converting down to composite (worst picture quality). A HDMI converter won't magically improve the image after it has been brought down to composite, you need a setup that remains at RGB and then converts to whatever your TV offers (other than composite).

Bryce.

I did use the scart cable going into the OSSC, it made no difference on the picture quality.

Offline chinnyhill10

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Re: GX4000 Display issues blurry
« Reply #8 on: 03:16, 20 April 18 »
Do you know where I can purchase a properly wired cable? or a cable for the 8 pin output?


Fully wired SCART's are 10 a penny on Ebay or any other supplier over here. They are cheap as well. In fact I often see them in charity shops in big boxes of cables!

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Offline Bryce

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Re: GX4000 Display issues blurry
« Reply #9 on: 09:37, 20 April 18 »
I did use the scart cable going into the OSSC, it made no difference on the picture quality.

How long is the SCART cable between the CPC and the OSSC?

Bryce.

Offline Turboman

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Re: GX4000 Display issues blurry
« Reply #10 on: 21:05, 20 April 18 »
How long is the SCART cable between the CPC and the OSSC?

Bryce.

It's 10 feet long, I just got a shorter one in the mail today but haven't tried it yet.
I also have these that I haven't tried yet. Can I safely use them without shorting something out? I don't know if the pinout is the same on the GX4000 as it is on the computers.

https://www.ebay.com/itm/Amstrad-CPC-664-6128-RGB-Video-Audio-Scart-Cable-1m/272370097026?hash=item3f6a85db82:g:IJ0AAOSwvzRX0oiY

https://www.ebay.com/itm/Amstrad-Plus-Adapter-for-Amstrad-CPC-Monitor-or-Scart-Cable/272508860690?hash=item3f72cb3912:g:0gAAAOSwEzxYa8~c

Offline gerald

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Re: GX4000 Display issues blurry
« Reply #11 on: 12:30, 21 April 18 »
GX4000 DIN video output is the same a the 6128Plus/464Plus.
But note that you must be using the 5V power input instead of the 9V to use it. Otherwise the colour will be really dark as the colour DAC reference voltage is changed according to the power supply used.
The DIN is to be used with a CM14/NN12 and the GX powered from it.
The SCART is to be use with the delivered power supply (originally 11V, but 9V is enough) to a regular TV.