Can this Seiko be fixed?

[Cesar]

On this Seiko some led segments are no longer working.
I was wondering if it could be an easy fix or 99USD thrown away.
Anyone familiar with these, how hard would it be to fix?



Thanks in advance.

Regards,
Cesar

[767Geoff]

typically, one would have to look at the module. also what do you mean by fixed?

I would diassemble the movement at least to the LCD panel and removal of said module. remove the LCD panel, the associated zebra strips and procede with a cleaining of the:

circuit board zebra strip contacts\
zebra strips
LCD panel zebra strip contacts.

Use denatured alcohol, 99% rubbing alcohol or some such. do not use solvents or silicone based cleaners.

reassemble and see if the problem has diasappeared. I would say you have a 90% chance of getting that unit to work again and that it is simply a display contact problem and not a display driver problem.

source the PDF for that movement if you need directions for diassembly. most of my modules (eye candy) have been restored with a simple cleaning of the contact points after disassembly.

I will post a how to for another movement on this topic next week. already took the pictures showing the restoration process.

Cheers, Geoff

[Cesar]

Hello Geoff,

By fixed i mean getting the missing segments to light up again.
I'm sure your advice will help, might be a contact problem or something.

Regards,
Cesar

[767Geoff]

Try the cleaning, I am sure it is not a display driver.

By fixed I meant replacing the module by waiting for a working donor in a horrible case. Not really a fix, but I don't know your level of expertise. These Re easy if you have the correct screw driver

Best of luck, Geoff

[charger105]

The following should help you fix the problem:


The contact labelled 3c circled in red should fix the partial zero. The contact circled in red labelled 7a 7e 7f should fix the 'o' in MO, and the contact circled in green should fix the missing seconds indication int the circular countdown wheel.
As others have advised, clean the PCB, the zebra strips and the panel.

There are a few typos in the technical PDFs, but you can figure out what they mean.
Since they're all in one corner, try applying some light pressure to this corner to see if it fixes the problem.
Rgds,
Andrew.

[Cesar]

Hello thank you all so very much, it's very much appreciated.
Today i decided to buy this watch, which was for sale on e-bay.
Small risk maybe but with all your information i'm willing to give it a shot at repairing the module.
As soon as it get's in i will try to clean it all up and get it back to life again, i will keep you guys updated.

Kind regards,
Cesar

Forgot to mention this was my 200th post.

[Cesar]

Charger,

Kinda looks like one of those maze puzzles where you need to find the correct way to the middle.
It all makes sence when i follow the not working segments i end up at the contacts you mentioned.
However i can not backtrack the top segment of the day of the week ML but those 2 on the side go to 7a 7e 7f but then you get MU which should say MO...
seems there is no line going to that or is there?

[Old Tom]

Your fault is either the panel or the internal logic in the chip- the G757 uses three separate backplanes (com 1, 2 or 3 on the LCD edge out) to address the LCD segments so segments always fail in clusters of three (not singly) if you have a driver or zebra strip issue (G757 zebra strips are total rubbish and can drive you mad) or if you lose a com driver then you get a very disturbed display with lots of segments missing. Panels can be replaced fairly easily but an internal logic failure is fatal. The D138 suffers similar failures (usually the panel) but qat least the zebra strips in this one are good.

[charger105]

Charger,

Kinda looks like one of those maze puzzles where you need to find the correct way to the middle.
It all makes sence when i follow the not working segments i end up at the contacts you mentioned.
However i can not backtrack the top segment of the day of the week ML but those 2 on the side go to 7a 7e 7f but then you get MU which should say MO...
seems there is no line going to that or is there?

There's a typo in the document.
There should be seven references for that digit: 7a,7b,7c,7d,7e,7f,7g
However, (7a, 7e, 7f, 7e) on one contact and (7f,7d,7g) are shown...........some duplicates and some omissions.
You are missing 7a,7b,7c and possibly 7g on your display. I'm guessing it's the contact indicated.

Congrats on your 200th post !
Rgds.