Blueberry 2nd Gen iMac White screen, crinkling noises, no startup chime? What is wrong?

[Froggy814]

And components/ chips that I need ta add. here is a photo of the chip and other components that I think is all that need to be filled in.


from

https://www.ebay.com/itm/177292913969?_skw=imac+G3+motherboard&itmmeta=01M1F2HAZF3R58P3R10V3MTVEC&hash=item29477b2d31:g:tasAAOSwJXFnrQet&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xDb2XXcAlFxsdUjAT0o7ND62L%2BwgS4BmTB5BNuxT%2FD4FMyxLv8ENPO1QLv4NnXg%2BfjwdjQQZsUUnZWQSgwVrm7EQ3Ucru3aS7FVFFDTIwJwVAnNgvb%2BOF0v9oQcWNILbgcRt8H7nzX4Q8MxiAOsPAMUWdM4cXxkSJYpZ0HF16%2BR6uE5FfaVqE%2FtkWo95j3rprPVyEVn7ECV0nybcDPy3bpiJ2RTcuSxIuu53vMSOV0xLxQK2xbqNPyUiQIr1OL%2FXAs%3D%7Ctkp%3ABk9SR_ivxeKLaA

 

[Froggy814]

Better photo...

https://www.ebay.com/itm/136810378821?_skw=imac+G3+motherboard&itmmeta=01M1F2HAZF4BQ5KW34NXNXKRJS&hash=item1fda88b645:g:jq8AAeSw7EFpL1tF&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xD3dlZwGUPwdfuuMyMW7CrKE5unIAvDUWYqyEE9PyB2py5BVNz71wuqLl7Pze6knRQncWbrHIIJsgK4PpM43FWDPDDaS5qhD5DbRTXpquH2dCjBfGqNGobk0vuh3S53J6PB68kukpo6jwg%2Fe3k%2BUIsJ3DfV5AAWJ1EsCwxr8ZuoVDpc8E7Xj9soihqifrBu2LK5zcVrZ54eIAFkhAwxWaDqpHzyRYVwTl9hq5IHSyaMp2xQNUGozxbuU4kU4eg2RL8%3D%7Ctkp%3ABk9SR_avxeKLaA

 

[Froggy814]

The chip is:

EL2386CS​

The passive component amount is:
capacitors:C15
resistors:R836,206,2,177,176,175,640
inductors:L3,4,5

I believe these are all the components you need. If there are more I will update. Again, if someone has a G3 that they can take the values for these that would be appreciated!

 

[Froggy814]

Chip!

 

[Froggy814]

Poop... There are components on the bottom needed as well. I guess I need to find a couple more photos. But I got the top. Right?!?

 

[Froggy814]

Photo's of the bottom of the board.

 

[Froggy814]

Got a whole bunch more differences that I believe need to be filled in. Thanks to this ebay listing and it's accompanying picture of the bottom of the board.

https://i.ebayimg.com/images/g/XdEAAeSwHjVqa-6g/s-l1600.webp

https://www.ebay.com/itm/257651957550?_skw=iMac+G3+logic+board&itmmeta=01M1FF6Y8TRAKE3PQQPKS6QGF7&hash=item3bfd40df2e:g:9EkAAeSwoi5qa-7U&itmprp=enc%3AAQALAAAA8GfYFPkwiKCW4ZNSs2u11xAA2n7sKPm1p%2BLU6vQURcevrOySmaHgdKJ0ZaCRCyqU5vyrqNdf%2FcUhgFuL2DALiDz1fFCEP2SUNOa8cItn4awpv3yuDafUaTr9jBZ58soCs5vaFC0hNVaYbU6mNtrEoOBMGUac5%2BdDDaQw6F1p6u2JLj9U%2BxxzYvKGNtxMIXENKxlwVOUTojC4MqcaKpNIQnIbIk7DbSE7HSuTzuN35Hm5Sw7bJgZN%2FbsNYOJ6HHoeQDQy7DvlGdspQdJ%2FcPuJRpBGALPiJ8Ql6nO2B220JJmF3GBKY2TW0PKGCQgfFQGKtg%3D%3D%7Ctkp%3ABk9SR9Dkm--LaA

 

[Froggy814]

I believe that this is the full list of parts. I will not continue on this endeavor yet and if I do it will be in another thread. I didn't realize that so many components are missing for the VGA plug. But if you want to attempt this yourself or can fill in values. It would be greatly appreciated.

Resistors:836, 206, 2, 177, 176, 175, 640, 636, 635, 169, 170, 171, 833, 834, 203, 208, 830, 831, 832, 835, 207, 174

Capacitors:15, 16, 198, 194, 196, 243, 249, 246

Inductors:3, 4, 5, 49, 50, 51

VR1
U5 which is a EL2386CS

 

[Froggy814]

Alright. I have stopped on the quest...

Tonight I will hopefully get under the motherboard and onto the bottom of the PAV board to inspect for leakage of any kind.

 

[treellama]

Wow I didn't mean to send you down such a rabbit hole. But I'm interested to see if you get VGA working.

 

[Froggy814]

I didn't mean to go down the hole either! It just sorta happened...

I am interested if I can get it working after I get it working. It seems like quite the endeavor. I thought it would just be slapping the plug in. But nope!

 

[Froggy814]

I took the iMac apart down to the Blue shell (haven't taken that off yet) And thankfully the Front panel that uses clips didn't break! Someone got paint on it before I got it (how?!?!) But Praise the Lord! It didn't break!

 

[Froggy814]

Also good teardown video:

 

[Froggy814]

Hey @3lectr1cPPC when are you going to add iMac back to your website so I can go scrolling through the information?

 

[3lectr1cPPC]

Hey @3lectr1cPPC when are you going to add iMac back to your website so I can go scrolling through the information?

Not sure right now. What information do you need?

 

[Froggy814]

Mostly wondering if you have a capacitor list. Or a schematic.

 

[3lectr1cPPC]

And capacitor reference I have is available here: https://macdat.net/repair/cap_reference.php
And the same for schematics: https://macdat.net/repair/apple_schematics.php

 

[Froggy814]

Thanks! I thought that you only had capacitor reference in the iMac section.

Is the 400Mhz Graphite the same as the Blueberry 350Mhz? In capacitors that is.

 

[3lectr1cPPC]

Is the 400Mhz Graphite the same as the Blueberry 350Mhz?

Are both the October 1999 models? If yes, then I would assume so.

 

[Froggy814]

No they aren't both from Oct 1999. One is from 1999 and the other is 2000 or 2001. I'll have to double check with mine, and just quickly scan it over. You are the only person with a capacitor reference that I know of!