CDTV without picture displaying ??

haynor666 · 31 October 2009, 16:17

Recently I bought CDTV but some strange damage. CDTV actually works, I can play cds, I can enter setup menu (I hear typical sounds) but I have black screen. Since it allow me to enter setup menu I assume only graphic is damaged. Is there any possibility to fix this ?

amiman99 · 01 November 2009, 16:38

The CDTV have 2-3 video outs. A RGB out, same as as any Amiga and Composite, Svideo and RF. The last 3 are on removable card, if you dont have video out on the card then maybe card is bad or is no inserted properly. I would try RGB out to see if it works

Toni Wilen · 01 November 2009, 16:54

Broken or missing "video module" = no output from 23-pin RGB out connector.

haynor666 · 02 November 2009, 09:04

I tried all, still the same. TV however detect RGB signal.

ferix · 02 November 2009, 12:09

I had one A500 with same symptoms. The fault was the HY1 (Video Hybrid), so, If It's the same case, you have to replace It, or (as I did) make your own.

haynor666 · 02 November 2009, 12:20

HY1 ? Can I repair this at home ?

ferix · 02 November 2009, 12:53

Well... It depends on your skills with the solder iron...
It's not a complicated circuit, but It needs some experience.
I'll post the schematics as soon as I draw them... :P
Here are the photos of my hybrid replacement.

haynor666 · 02 November 2009, 12:57

It doesn't look too complicated.

Toni Wilen · 02 November 2009, 13:02

I wouldn't replace the hybrid (DA converter) without more testing.. (it is not the only reason for no video)

Which CDTV "video slot" adapter do you have? (RF? Scart?)
I guess you used TV's Scart connector? Does it work with other Amiga models? Black/gray screen with syncs detected can also mean TV is using composite input, not RGB input.

ferix · 02 November 2009, 13:11

Quote:

Originally Posted by Toni Wilen

I wouldn't replace the hybrid (DA converter) without more testing.. (it is not the only reason for no video)

Which CDTV "video slot" adapter do you have? (RF? Scart?)
I guess you used TV's Scart connector? Does it work with other Amiga models? Black/gray screen with syncs detected can also mean TV is using composite input, not RGB input.

Well, I supposed he made those chekings... but you're right. Hybrid replacing is the last step...
I was only talking about my experiences with other amiga models. I apologize if I confused you.
Also, check the power levels.

haynor666 · 02 November 2009, 13:13

I have 3 CDTVs. First one works with RGB-SCART cable, second and third do not display picture (or display black picture, TV detect RGB switch and it looks like is in sync with CDTV). My amiga 1200 also works with this cable.

I tested other outputs - RF and composite video.

Toni Wilen · 02 November 2009, 13:19

Ok, try replacing Denise from working Amiga. Still not working? Check connections between RGB output RGB-pins and video hybrid (and hybrid and Denise). I guess it is 99% surely hybrid ic problem if everything else checks ok..

haynor666 · 02 November 2009, 13:26

Good idea, I should look for cheap A500 (I'm not going to rip my working CDTV).

About this HY1 - what elements might fail? Capasitor (very often I think), transistors oraz resistor (probably not)?

rkauer · 03 November 2009, 01:27

If the HY1 fails, the most advisable thing to do is replacing the whole unit. Rip it off an ancient dead A500.

haynor666 · 03 November 2009, 07:40

I have up with replacing whole chipset, cost of buying and delivering amiga 500 is to high for this purpose. I'll try only fix HY1.

Ferix: Is this HY1 hand made or removed from amiga ?

cosmicfrog · 03 November 2009, 10:41

think some1 on amibay has a load of amiga chips for sale

haynor666 · 03 November 2009, 12:03

Thanks for tip

Indeed at least Ruud is selling some chips.

02 January 2010, 19:48

Quote:

Originally Posted by ferix

I had one A500 with same symptoms. The fault was the HY1 (Video Hybrid), so, If It's the same case, you have to replace It, or (as I did) make your own.

Hello, where did you find information about how to build a Vidiot replacement? Did you manage to remove the black coating from a broken one? I think I have a faulty one in my CDTV, since it has the discussed symptoms... Thanks!

ferix · 03 January 2010, 02:57

Quote:

Originally Posted by haynor

Ferix: Is this HY1 hand made or removed from amiga ?

It's hand made. I've designed and buid It myself.

Quote:

Originally Posted by fiat1100d

Hello, where did you find information about how to build a Vidiot replacement? Did you manage to remove the black coating from a broken one? I think I have a faulty one in my CDTV, since it has the discussed symptoms... Thanks!

I designed It, but It's very simple. I'll post the schematics tomorrow.

04 January 2010, 13:56

Quote:

Originally Posted by ferix

I designed It, but It's very simple. I'll post the schematics tomorrow.

Ok, thank you very much, will wait for the schematic!

Being quite ignorant, does the use of a self-made replacement introduce any delay in video displaying if compared to the "original" hybrid? Or the '245 buffers after Denise are there for guaranteeing correct timings?

31 October 2009, 16:17	#1
haynor666 retro maniac Join Date: May 2002 Location: Tarnobrzeg/Poland Age: 45 Posts: 1,771	CDTV without picture displaying ?? Recently I bought CDTV but some strange damage. CDTV actually works, I can play cds, I can enter setup menu (I hear typical sounds) but I have black screen. Since it allow me to enter setup menu I assume only graphic is damaged. Is there any possibility to fix this ?

02 November 2009, 12:53	#7
ferix Registered User Join Date: Sep 2009 Location: Spain Age: 47 Posts: 95	Well... It depends on your skills with the solder iron... It's not a complicated circuit, but It needs some experience. I'll post the schematics as soon as I draw them... :P Here are the photos of my hybrid replacement. Attached Thumbnails

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01 November 2009, 16:38	#2
amiman99 Registered User Join Date: Sep 2009 Location: San Antonio, TX USA Age: 50 Posts: 1,185	The CDTV have 2-3 video outs. A RGB out, same as as any Amiga and Composite, Svideo and RF. The last 3 are on removable card, if you dont have video out on the card then maybe card is bad or is no inserted properly. I would try RGB out to see if it works

01 November 2009, 16:54	#3
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,540	Broken or missing "video module" = no output from 23-pin RGB out connector.

02 November 2009, 09:04	#4
haynor666 retro maniac Join Date: May 2002 Location: Tarnobrzeg/Poland Age: 45 Posts: 1,771	I tried all, still the same. TV however detect RGB signal.

02 November 2009, 12:09	#5
ferix Registered User Join Date: Sep 2009 Location: Spain Age: 47 Posts: 95	I had one A500 with same symptoms. The fault was the HY1 (Video Hybrid), so, If It's the same case, you have to replace It, or (as I did) make your own.

02 November 2009, 12:20	#6
haynor666 retro maniac Join Date: May 2002 Location: Tarnobrzeg/Poland Age: 45 Posts: 1,771	HY1 ? Can I repair this at home ?

02 November 2009, 12:57	#8
haynor666 retro maniac Join Date: May 2002 Location: Tarnobrzeg/Poland Age: 45 Posts: 1,771	It doesn't look too complicated.

02 November 2009, 13:02	#9
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,540	I wouldn't replace the hybrid (DA converter) without more testing.. (it is not the only reason for no video) Which CDTV "video slot" adapter do you have? (RF? Scart?) I guess you used TV's Scart connector? Does it work with other Amiga models? Black/gray screen with syncs detected can also mean TV is using composite input, not RGB input.

02 November 2009, 13:13	#11
haynor666 retro maniac Join Date: May 2002 Location: Tarnobrzeg/Poland Age: 45 Posts: 1,771	I have 3 CDTVs. First one works with RGB-SCART cable, second and third do not display picture (or display black picture, TV detect RGB switch and it looks like is in sync with CDTV). My amiga 1200 also works with this cable. I tested other outputs - RF and composite video.

02 November 2009, 13:19	#12
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,540	Ok, try replacing Denise from working Amiga. Still not working? Check connections between RGB output RGB-pins and video hybrid (and hybrid and Denise). I guess it is 99% surely hybrid ic problem if everything else checks ok..

02 November 2009, 13:26	#13
haynor666 retro maniac Join Date: May 2002 Location: Tarnobrzeg/Poland Age: 45 Posts: 1,771	Good idea, I should look for cheap A500 (I'm not going to rip my working CDTV). About this HY1 - what elements might fail? Capasitor (very often I think), transistors oraz resistor (probably not)?

03 November 2009, 01:27	#14
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	If the HY1 fails, the most advisable thing to do is replacing the whole unit. Rip it off an ancient dead A500.

03 November 2009, 07:40	#15
haynor666 retro maniac Join Date: May 2002 Location: Tarnobrzeg/Poland Age: 45 Posts: 1,771	I have up with replacing whole chipset, cost of buying and delivering amiga 500 is to high for this purpose. I'll try only fix HY1. Ferix: Is this HY1 hand made or removed from amiga ?

03 November 2009, 10:41	#16
cosmicfrog The 1 who ribbits Join Date: Apr 2006 Location: leek, Staffs, UK Age: 56 Posts: 3,557	think some1 on amibay has a load of amiga chips for sale

03 November 2009, 12:03	#17
haynor666 retro maniac Join Date: May 2002 Location: Tarnobrzeg/Poland Age: 45 Posts: 1,771	Thanks for tip Indeed at least Ruud is selling some chips.

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