CurtPalme.com Home Theater Forum

mc86

I didn't see these already posted so: For any cheapskates out there, here is an alternative to buying a new dallas chip...I think mine has two batteries, but the concept should still apply. I might have a go at it if I can't find a replacement DS1235YW-150 for cheap; Not sure where I got my last one (~2009).

http://www.mcamafia.de/mcapage0/dsrework.htm

cheers,
Matt

CIR Engineering

**Curt Palme** · Posted: Wed Apr 11, 2012 1:08 am Post subject:

Interesting, they are indeed late model chips on eBay, 2008 and 2010 were the first two I looked at, but all 6 G90 Dallas chips last week were from 1997 to 1999. NO THANkS

CIR Engineering · Posted: Wed Apr 11, 2012 5:22 am Post subject:

It's a little hard to find Dallas chips for the G90 as well that are actually new. Obviously you don't want a used pull, but even NOS ones that were made more than 5 years ago I avoid. I got a dozen in a couple years back that were new and unused, but all about 8 years old. All 12 had dead batteries and I was out of luck on that lot Sad

Now I make sure that any I order are less than 2 years old.

craigr

HaydnG90 · Joined: 22 May 2006 Posts: 1335

When I replaced my Dallas chip it was with one of these. The '120+' being the key here.
http://parts.digikey.com/1/parts/545530-ic-nvsram-1mbit-120ns-32dip-ds1245y-120.html

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4379 Location: Phoenix

Guys

It is my understanding that you can usually go from a 1235 to a higher number 1245 (more memory) and from 150ns to 120ns (faster read) without problems; keep in mind if your parts source cannot offer the exact replacement for you.

.

HaydnG90 · Joined: 22 May 2006 Posts: 1335

What are the chances that these chips will be hard to source in the next 5-10 years? Yes, I'm seriously thinking that I'll still be enjoying my G90 well into the 3rd Dallas chip replacement.

Gannon · Posted: Wed Apr 11, 2012 10:35 pm Post subject:

This is probably the greatest news since...well...ever. Thanks for these pioneering rogue repairs...helping keep this old stuff alive.

Big love from Detroit...

Gannon · Posted: Thu May 03, 2012 5:43 pm Post subject:

Of all our chip guys here...is anyone doing this as a service yet?!

I'd like to take a newer Dallas chip to a jobsite in Boulder later this month, and replace the ten-year old one in a G90 as insurance against Murphy.

So...do I prepare to butcher the existing chip...or are there fresh units I can buy, and for how much?!

Forgive my ignorance here...I'm a tweak, not a tech.

Cheers,
John
Detroit

HaydnG90 · Joined: 22 May 2006 Posts: 1335

No butchering required. Just remove the YA board, pull the old Dallas chip, copy contents using an EEPROM reader/writer, copy file to new chip and reinstall new chip onto the YA board. Just remember to take a mental note of the orientation. This should be all thats required. Keep the old chip handy in case the new chip is faulty and save the copied data in a folder on the PC.

mc86 · Posted: Thu May 03, 2012 9:53 pm Post subject:

John -

HaydnG90's right - I think all of the dallas chips are still available -- this was just an alternative. Once the semester ends and student's leave me alone(!), I'll get to playing with this and will post results.

Matt

mc86 · Posted: Thu May 03, 2012 10:05 pm Post subject:

John -

HaydnG90's right: I think all of the dallas chips can still be found -- hacking them was just an alternative. Wink

If time permits this summer, I'll play with one and will post results.

Cheers,
Matt

**Curt Palme** · Posted: Fri May 04, 2012 1:05 am Post subject:

John, order a new chip. Last I checked, the ones on eBay were old stock, as old as the ones in the G90s that I'm seeing. I'm buying new ones with 2010 or 2011 date codes. I just ran out, but will order more on Monday.