What is this brown thing?

[falter]

Is this (at DL1) a cap?  It appears to be made of ceramic.  Anyway, I've had this long-dead Amiga 1000 rev A board, and decided to take one more look at it and noticed the third leg of this part is broken right off.  It doesn't appear so in the photo I've attached, but it definitely is.  Wondering if this could be behind the totally black screen on power up.  Hoping to find a replacement somewhere.

https://drive.google.com/file/d/0B4pq0-BHd2x6ekFXOGpiZnFTd1E/view?usp=sharing

https://drive.google.com/file/d/0B4pq0-BHd2x6dmhsa04xWDJiUWs/view?usp=sharing

Many thanks!

[arongooch]

Some sort of hybrid Delay Line it looks like and according to the DL1 on the silk screen also suggests it's a Delay Line. If it is indeed a delay line that could most definitely cause a black screen output. Not sure what you can do for a replacement though.

[CodePoet]

Is this (at DL1) a cap?  It appears to be made of ceramic.  Anyway, I've had this long-dead Amiga 1000 rev A board, and decided to take one more look at it and noticed the third leg of this part is broken right off.  It doesn't appear so in the photo I've attached, but it definitely is.  Wondering if this could be behind the totally black screen on power up.  Hoping to find a replacement somewhere.

https://drive.google.com/file/d/0B4pq0-BHd2x6ekFXOGpiZnFTd1E/view?usp=sharing

https://drive.google.com/file/d/0B4pq0-BHd2x6dmhsa04xWDJiUWs/view?usp=sharing

Many thanks!

Hi,

As arongooch pointed out, it's a Delay Line (400ns) used for Chroma/Luma alignment by U7B, a Motorola MC1377 RGB to PAL encoder. Without it you'll get a blank display on the composite output, but output of the RGB port may be fine if there are no other issues.

Motorola recommend TDK Part# DL122301D for the delay line, and the outline looks almost identical to your photo: https://imgur.com/HW1cG5D -- But unfortunately they're really hard to find. You can probably use a 330ns delay line with a separate bandpass transformer, but the MC1377 datasheet warns about color drifting when using lines under 400ns

Edit: Here's the section of the A1000 schematic with the delay line: https://imgur.com/9YpxfBJ

[falter]

Thanks guys!

I have no video or any sign of life other than power led when i turn the computer on.  Doesn't matter if it is composite or RGB.  At one time the disk drive would sort of run quietly, endlessly, but putting a disk in would do nothing.  Now it doesn't even do that much.

I've swapped and checked CPU, Agnus, etc.. every IC with known good.  Bought two replqaement PSUs.  Zip.  This delay line thing was one thing I hadn't noticed before.  I was hoping that might be it but sounds like not.  I'm starting to wonder about the 'even / odd' kickstart eproms I have (think thats what they are?).  I have four of them.  Most other machines I've seen in pics only have two.  I don't have a way to check them but seeing how the board appears to be undamaged.. I mean.. no idea where else to go.  Like I said.. was hoping this was it.

[CodePoet]

Thanks guys!

I have no video or any sign of life other than power led when i turn the computer on.  Doesn't matter if it is composite or RGB.  At one time the disk drive would sort of run quietly, endlessly, but putting a disk in would do nothing.  Now it doesn't even do that much.

I've swapped and checked CPU, Agnus, etc.. every IC with known good.  Bought two replqaement PSUs.  Zip.  This delay line thing was one thing I hadn't noticed before.  I was hoping that might be it but sounds like not.  I'm starting to wonder about the 'even / odd' kickstart eproms I have (think thats what they are?).  I have four of them.  Most other machines I've seen in pics only have two.  I don't have a way to check them but seeing how the board appears to be undamaged.. I mean.. no idea where else to go.  Like I said.. was hoping this was it.

It might be worth trying out DiagROM if you're able to flash your own EEPROMs and install them into the A1000: http://www.diagrom.com/

Basically tries to diagnose faults on the mainboard, and either s**ts them out on the screen (if it is able to) or out via the serial port... Pretty neat actually