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When do we start hacking the CECB's ? - Page 5

post #121 of 164
lmao

The Zinwell is a 5VDC input. Anyone interested?
post #122 of 164
Everything on Airlink101 ATVC102 are ground. It is a negative ground at +12V DC in. RF in/out and AV jacks are all grounded together. In fact, the unit is a full metal shell construct that fully grounded.
post #123 of 164
Quote:
Originally Posted by systems2000 View Post

lmao

The Zinwell is a 5VDC input. Anyone interested?

Yeah, that one is already on my personal list as confirmed.
post #124 of 164
I could open my DTA800B and post some pics of its board. I want S-Video on this thing.

CECBs are like so many 1980's microcomputers with "for future use" ports and empty spots on the boards or unused mounts in the cases that never got used for anything.

Quote:
Originally Posted by twey View Post

Here you are.

The DTA809-Svideo_mod.jpg indicates two area of interest.
1) S-Video connector and two ferrites.
2)R452 strapping resistor

S-video-filter.jpg zoom in on #1. The S-video connector is a standard foot print. Should not be too hard to get. I took one from one of the old PCI-VGA card I have and it fits fine.

R452.jpg zoom in on #2. The R436/R437/R443 and R452 all look like strapping resistors. The R443 is stalled with 10 Kohm. The R452 was added to allow s-video output (10 Kohm).

What other (and few more look alike) strapping does? Don't know yet. I only have one DTA809 and not ready to to take the risk yet(it became hard to find...). If somebody has the full spec of BMC chip to share that will be nice...


Have fun....
post #125 of 164
Quote:
Originally Posted by bizzybody View Post

I could open my DTA800B and post some pics of its board. I want S-Video on this thing.

Good luck.

Quote:


CECBs are like so many 1980's microcomputers with "for future use" ports and empty spots on the boards or unused mounts in the cases that never got used for anything.

Exactly.
post #126 of 164
Here's a repost from the RCA DTA800 Digital to Analog TV Converter Box' thread:

Quote:
Originally Posted by twey View Post

Yep,

Add a S-video connector (natually)
Add two ferrites as the EMI filter (or just bridge them) between two pairs of big pad just behind the connector.
Now, here is the key: Add one 10 Kohm as pull up straping resistor on R452. Locate at right of BCM3543.

I did this on a DTA809 (newer with passthrough). It looks like it have the same placement as DTA800. I ignored all the filter caps due to lack of test pattern to verify it.

I'm really glad I happened to run across this post. This is a great mod.

Yes, you can do this S-Video mod on a DTA-800B. I have two, and decided it would be worth trying on one of them.

It takes only 4 steps, and only one of the four (the last ) is very challenging.

1- Solder a wire between the empty position for L302 and L303 each (behind where the S-Video jack goes).
2- Mount an S-Video jack in the empty position on the board.
3- Drill out the case back for access to the plug (use the circle molded into the case as a guide).
4- Mount a 10k resistor in the empty position for R452.

As you can see (from the attached image), the resistor I used is much bigger than the ones that were intended to be used. But even then, it was very small. Unfortunately, it was still a little too small to fill the gap between the R437 dot (which is electrically common to one side of R452), and the other R452 dot, and too big to fit easily in the regular R452 position. I had to try three times to get the solder to 'mush out' to where it would contact both R452 dots. Working with components on this scale is not so easy, you'll need a lighted magnifier, and small soldering iron.

Use a pin to get contact on the pad surrounding the feed through hole for R452, and measure resistance from there to the common R437 dot to verify success.

I guess I could have used a regular 10k resistor, and run short tiny wires to the common R437 dot and the other R452 dot to connect it with. A dab of epoxy could secure the loose component and wires. Either way should work, pick your poison.

------

The the attached image shows a comparison between the S-Video and Composite outputs. It was obtained from an HD signal, photographed using simultaneous (side by side) displays of the two video outputs. The images consist of equal portions of what was about 25% of the 4:3 screen area.
LL
LL
post #127 of 164
The S-Video shot does look a bit sharper horizontally.

A better compare would be running both inputs into a good video capture card and making short video clips of the same clip.
post #128 of 164
Nice work! Now, if someone can figure out S-Video for the Zenith boxes
post #129 of 164
Quote:
Originally Posted by oldsyd View Post

Nice work! Now, if someone can figure out S-Video for the Zenith boxes

Agreed, that and maybe a 24 hour guide would make it the ideal box
post #130 of 164
Quote:
Originally Posted by jjeff View Post

Agreed, that and maybe a 24 hour guide would make it the ideal box

Guide hacks are probably not going to happen. From what I've read, anything involving firmware or software hacking on a CECB isn't really viable. People say it would take too much time for such a little payoff.

However, it seems there's a few hardware hacks out there which are fairly easy.
post #131 of 164
I'd just be happy if someone could figure out how to make the menu and info box text bigger on the CM7000.
post #132 of 164
Quote:
Originally Posted by confuzzled View Post

I'd just be happy if someone could figure out how to make the menu and info box text bigger on the CM7000.

Get a bigger TV
Sorry, I couldn't resist
post #133 of 164
Quote:
Originally Posted by jjeff View Post

Get a bigger TV
Sorry, I couldn't resist

A no-cost option to make the display appear bigger would be to move closer to the TV set...


.
post #134 of 164
Exactly, to both suggestions. I have no trouble at all reading it on my 32" analog set from about 8 feet away.
post #135 of 164
OK, does anyone remember those magnifying glass things that you could hang in front of your 12" TV to make it look something like 15" talk about cheep
post #136 of 164
I had a Sunkey SK-801ATSC unit die on me. I'm going to remove the UP/DOWN buttons and put them into one of my DT502's. Since they are the same board, I don't foresee any problems.

I'd like to see if someone can figure out how to pull the firmware out of CECB's and push it into other revisions to get better CECB's. Two that come to mind are the Zinwell ZAT-970A's (0830 and lower) and the earlier Sunkey SK-801ATSC (ie. Symbios' unit).
post #137 of 164
Quote:
Originally Posted by jjeff View Post

OK, does anyone remember those magnifying glass things that you could hang in front of your 12" TV to make it look something like 15" talk about cheep

Yeah, but we're showing our age.

I also remember those sheets that turned your B&W picture to "color". Man, were those things bogus.
post #138 of 164
post #139 of 164
Anyone know what kind of screws those are on the DTVPal wall wart? I've seen three-bladed screw heads before, but those on those the blades radiated straight out. DTVPal's look like a klingon variant.

I'm looking to power a USB hub and thanks to buggy firmware I have a spare 5v power supply. Just needs a barrel connector. Since the connector I have is on a full length of wire I was looking into opening the power supply housing and connecting at the terminals inside.
post #140 of 164
Quote:
Originally Posted by equivocal View Post

Anyone know what kind of screws those are on the DTVPal wall wart? I've seen three-bladed screw heads before, but those on those the blades radiated straight out. DTVPal's look like a klingon variant

I don't currently own either unit at the moment...

But when it comes to security heads, there are hundreds.
Look over any page like THIS one as example...

If my "Trecky/Trekky" side (Fans use both...) understands you correctly,
it sounds like your indicating the wings are offset like this style?:


Attachment 153770

little kits full of security bits are everywhere,
like eBay and Harbor Freight real cheap.

As example, a 100-Piece Security Bits Set like
THIS for $14.99 (With free shipping too)
should be a good addition to your toolbox
for poking where they don't want you to...

A commonly available 100-Piece set is
THIS one too for $7.99 if this helps out.
(Shipping not free, so factor that in...)

I have had this (Second) one in my hands.
It is the Drill Master Item# 91310 bit set.
It includes four regular, and three offset bits
(Of the three-bladed security variety).

By "Offset", I mean like the "Klingon" screws (Above)...LOL
LL
post #141 of 164
That's it. Thanks for the links.
post #142 of 164
any hacks to add a component or DVI port so we can get HD out of any of these boxes?
post #143 of 164
Quote:
Originally Posted by nyc2010 View Post

any hacks to add a component or DVI port so we can get HD out of any of these boxes?

Excellent question, we know it's in there somewhere!
post #144 of 164
No, it isn't...
post #145 of 164
Quote:
Originally Posted by ProjectSHO89 View Post

No, it isn't...

Why?
post #146 of 164
Quote:


Excellent question, we know it's in there somewhere!



only if HD tuner boxes would be as cheap as the cecbs.
post #147 of 164
Quote:
Originally Posted by nyc2010 View Post



only if HD tuner boxes would be as cheap as the cecbs.

Plus many of us already have CECBs. Can't beat that kind of cheap.
post #148 of 164
Quote:
Originally Posted by Floydage View Post

Plus many of us already have CECBs. Can't beat that kind of cheap.

I want to watch HD not SD!

i don't get it why the HD tuner boxes are so expensive compared to a analog tuner boxes.
post #149 of 164
Quote:
Originally Posted by nyc2010 View Post

i don't get it why the HD tuner boxes are so expensive compared to a analog tuner boxes.

Probably because you do not realize that the "HD tuner" also has a 32-bit RISC processor and memory plus D-to-A convertors.

As for the low cost of CECBs, do you understand the terms "economy of scale" and "guaranteed market"? The cheap CECB should be regarded as part of a freak, one-time event (the analog TV shutoff) that other products cannot duplicate.
post #150 of 164
Quote:
Originally Posted by nyc2010 View Post

i don't get it why the HD tuner boxes are so expensive compared to a analog tuner boxes.

Probably more R&D cost, user software, connectors (ex: HDMI, component, s-video, programming comm), etc. Plus the sales volume and marketing economics pushed the price curve down on the CECBs.
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