Removed the old Dallas chip in the IC333 slot on the YA board, copied the data from the old chip to a new Dallas chip, installed the new chip and put back the YA board, turned on the G90 and Shazam everything was exactly there as before.
Bit of History:
A few months ago I had to turn off my G90 via its hard switch on the back and had left it off for about one hour. When I went to turn it on again I received a series of error code flashes on the error code LCD window on the back of the G90 in the following order: 88, 88, 10, and then remaining at 11. Remote would not turn G90 on and turning the hard switch off and on again produced the same series of error codes. Did some reading on this forum and determined that the battery in my Dallas chip was failing. At that point in time in order to get the G90 going again I had to do a reflash of the firmware software, which after a few attempts I did successfully.
Here is the post on that:https://www.avsforum.com/avs-vb/showt...ghlight=dallas
Here is a more detailed procedure to changing the Dallas chip.
1. Turned on G90 and did a Data save to Service Block – Page 132 of G90 Installation manual. This was done as a precaution to a possible total failure of the old Dallas chip whereby it would no longer be readable (i.e. Battery too weak causing corrupt data, lack of readability etc.).
2. Turned G90 off from remote.
3. Turned G90 off from hard switch on back (I did not unplug my G90 but you can if you want to be extra safe).
4. Unscrewed the 10 screws on the back of G90 near where YA board is installed and removed back cover.
5. Unlatched the YA board black clips at either ends of the board and slid out the YA board carefully. Make sure that you are not carrying any static electrical charge as the YA board is sensitive to static electricity and you can end up damaging the board rendering it useless. (I think Sony is currently charging about 1700 to fix it)
6. Placed the YA board on an antistatic foam sheet. Bought the sheet at a local electronics store measuring 18” x 24” for few bucks.
7. Put on an antistatic bracelet and attached it’s alligator clip to the back of my PC.
8. Removed Dallas chip with my fingers while holding the YA board down near the chip. Be careful in prying it loose here as the chip was solidly plugged into a white socket. It is not soldered. You actually need a fair amount of force to pry it off. I had pulled a bit too hard and accidentally hit part of the Dallas chip wires against my other hand and bent some of them. I carefully rebent the wires back into place.
9. I then set up my EPROM programmer and placed the Dallas chip into the programmer chip holder. Very important to align pin one of the Dallas chip in the correct socket or you run the risk of damaging the chip when reading it with the EPROM programmer. There is a small circular indent (chips pin 1 marker) on the top part of the Dallas chip so it was easy to identify pin 1.
10. I then read the chip and saved data (hex file containing serial number, tube hours and user data – convergence, gray scale etc) on my computer.
11. Pulled old Dallas chip off EPROM programmer and installed new Dallas chip and Programmed/verified data to new Dallas chip.
12. Installed the new Dallas chip to the YA board. Make sure that chip is installed with pin one in the correct socket. The old Dallas chip and new Dallas chip looked identical so I just installed the new chip in same direction as the old chip (identified by the direction of the writing on the chips). Make sure you make a note of the direction when you remove the old chip. Again, be somewhat careful as you need a firm amount of force to fully put the Dallas chip all the way back into the socket and you do not want to bend the Dallas chip’s metal pins in the process. I first aligned the chip parallel to the socket on the YA board, initially pushing lightly to get the pins in as much as possible and as evenly as possible and then applied a much firmer even push to both top ends of the Dallas chip to get if fully in.
13. Installed the YA board into my G90 and reinstalled the back plate and 10 screws back in.
14. Turned G90 on from the hard switch on the back and looked for any possible error codes. No codes present.
15. Turned G90 on via remote and went into service mode and checked brightness, contrast, serial number, tuber hours etc.. All information was exactly the same.
16. New Dallas chip should be good for at least 10 more years.
-Old Dallas chip was a DS1245Y - 120 with date inscription on top of chip of Dec 1998 (Chip date code 9852H - showing chip made in 1998 on 52nd week)
-New Dallas chip was a DS1245 - 120+ with date inscription on top of chip of 2007 March (0711M – showing chip made in 2007 on 11th week). The “+” sign refers to RoHS compliant and is Pb-free as required in Europe. This makes no difference and since this requirement was introduced in 2007 I knew I would be buying a “newer chip”.
-The old chip was manufactured with battery connected or engaged so that its 10 yr battery life span would start on the manufactured date. Probably reason why my battery started showing signs of dying in 2008 since it was made and battery engaged 10 years earlier in 1998. The new Dallas chip was manufactured without battery connected/engaged so it life starts from the date that I first programmed it which was today even though it was manufactured in March 2007.
-Since I had copied the old data fully from the old Dallas chip to the new one I did not need to reflash the Sony G90 firmware software again as I had previously needed to do when the Dallas chip failed a few months ago.
I hope the above assists in alleviating anyone’s concerns in regards to their G90 and Dallas chip. All you need to do is buy a chip and programmer and you are set. I would suggest changing the chip upon seeing first signs of failure since if the chip becomes too unstable and unreadable then the data might not be transferable. At the very least save your user data to the service block periodically so you at least have a back up there.
I have a couple extra Dallas chips I acquired just in case. Should anyone want to send me their old Dallas chip to make a computer back up and program onto a new chip just let me know.
Dallas chip at Newark:http://www.newark.com/88K4025/semico...IM-DS1245Y-120
Below are some pictures of the procedure.