camrok
Needs a Life!
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Post by camrok on Feb 8, 2018 22:17:07 GMT -8
You may remember I picked up this G757-5020 from a thrift shop for $2 a few years back.  This is now the 3rd time I’ve changed the module and I have flipped through about 4-5 different modules to find the best one and a few months ago the module Fritzed our yet again. Thankfully Dave aka DAHASCO sourced me a reasonable donor. It had some green goop but that disappeared with the help of some help of some alcohol.  |
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Adrian-VTA
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Adelaide, South Australia
Posts: 5,327
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Post by Adrian-VTA on Feb 8, 2018 22:53:34 GMT -8
Im nearly certain it's the power regulators, which are the black 3 legged rectangles on the board.
Haven not had time to sit down and test my theory.
Don't chuck away the modules, we might be able to fix them in the future.
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camrok
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Post by camrok on Feb 8, 2018 23:11:34 GMT -8
Im nearly certain it's the power regulators, which are the black 3 legged rectangles on the board. Haven not had time to sit down and test my theory. Don't chuck away the modules, we might be able to fix them in the future. Crazy modules. I put the remaining parts back together. The donor lcd and the former module. It was dead as expected. Got up this morning and the pseudo pussy (not octopussy) fired up and was running perfectly. I’d reset and completely dismantled and cleaned the original module at least 3 times. You live to fight another day, Mr Bond! |
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tritto
WS Benefactor
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Post by tritto on Feb 9, 2018 0:42:13 GMT -8
Lookin' good - one again.
Good to see it's still ping strong some hours later.
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Mr.Jones
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Hamburg, Germany
Posts: 4,679
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Post by Mr.Jones on Feb 9, 2018 1:02:03 GMT -8
The G757 must be the most suicidal of all the Seiko movements.  I have a nearly untouched G757-4010 which must have broken down shortly after the seller got it... Was only fixable by replacing all the capacitors and even then was dim and weak. So a module replacement happened... Better to wear it ever so often, or else it will die alone in a box.  |
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pip
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Berkshire, UK
Posts: 6,175
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Post by pip on Feb 9, 2018 1:11:55 GMT -8
Yes, I have read that the problem is usually the capacitors. There are four of them and they are supposed to be 170+ nanofarad and drop to way below 150 nf. Thought that replacing them with new 180 nf was supposedly the way to fix these?
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cobrajet25
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"Underweared curmudgeon!"
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Post by cobrajet25 on Feb 9, 2018 5:44:29 GMT -8
Yes, I have read that the problem is usually the capacitors. There are four of them and they are supposed to be 170+ nanofarad and drop to way below 150 nf. Thought that replacing them with new 180 nf was supposedly the way to fix these? Fiddly, bitchy damned things. But very cool when they are working. These are like the 7123 of vintage Seiko digitals...  |
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rossr
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Posts: 1,843
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Post by rossr on Feb 9, 2018 16:55:57 GMT -8
Yes, I have read that the problem is usually the capacitors. There are four of them and they are supposed to be 170+ nanofarad and drop to way below 150 nf. Thought that replacing them with new 180 nf was supposedly the way to fix these? Fiddly, bitchy damned things. But very cool when they are working. These are like the 7123 of vintage Seiko digitals... Trying to give the 0674 some competition. |
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Adrian-VTA
Global Moderator
Adelaide, South Australia
Posts: 5,327
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Post by Adrian-VTA on Feb 10, 2018 16:21:40 GMT -8
I think that might be the lead I need to sort these out. I just put some diagnostic gear on the caps and one reads 145nF, the other three are 110-135nF. So if this info is correct that could be a cause. It could also be the upconverter modules. It has one for the alarm and one for the display. This is a problematic module I have here. I just ordered a bunch of 180nF caps to try. Yes, I have read that the problem is usually the capacitors. There are four of them and they are supposed to be 170+ nanofarad and drop to way below 150 nf. Thought that replacing them with new 180 nf was supposedly the way to fix these? |
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Adrian-VTA
Global Moderator
Adelaide, South Australia
Posts: 5,327
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Post by Adrian-VTA on Feb 10, 2018 16:22:21 GMT -8
I'm nearly certain most of these issues stem from other components on the board, not the IC. Fiddly, bitchy damned things. But very cool when they are working. These are like the 7123 of vintage Seiko digitals... Trying to give the 0674 some competition. |
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Post by pepperx7mbr on Jan 27, 2023 10:45:34 GMT -8
Hi to all who have posted, thank you. Finally found some very helpful info re: 757 module. I purchased my G757-5020 in 2017. It was in mint condition and full working order. I had it regularly serviced but due to my oversight I over ran a service guarantee and the battery has leaked and permanently damaged the module  I will admit to not being an expert by any means but upon reading the relevant posts, is it possible to swap out the module from another Seiko watch and if so would anyone be able to suggest some models to look out for? ![]()  |
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saldog
WS Benefactor
Aspiring to be a savant, but for now just a watch idiot
Posts: 1,107
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Post by saldog on Jan 27, 2023 22:23:11 GMT -8
Any G757 movement will do. It’s the LCD, case, and trim that changes on the different models. The circuit can be bad or the LCD. It is more common to have the LCD fail than the circuit. I have one that needed an LCD and I actually found a NOS one on eBay and that fixed it. If you know the LCD is good, look for any G757 that is running but maybe has some LCD segments out. Those go for big discounts.
I don’t know what country you’re in but if you are in the UK or Europe, there is a guy named Andy Windle that can fix just about any Quartz digital or analog watch. You can find him on Facebook.
For the future, the G757 is extremely delicate and you must be diligent about keeping batteries fresh in it. Even sitting with no battery in it is not good. They are more reliable running on constant power. Heed the low battery warning, a flashing display, by immediately replacing the battery.
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Post by pepperx7mbr on Jan 28, 2023 4:36:41 GMT -8
That is great advice, thank you very much. I had suspected that the modules are interchangeable and will source one out. I was considering selling the watch as it is but reluctant as it is in excellent condition. Thank you again and will post my results.
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