Ms9 died after installing a cap kit

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copados33
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Ms9 died after installing a cap kit

Post by copados33 » February 11th, 2019, 1:57 am

Did a complete cap swap, turned it on and it showed vertical collapse, then it shutted off after a few seconds, now it doesn't turn on anymore, what could be tbe problem?

chibishin
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Re: Ms9 died after installing a cap kit

Post by chibishin » February 11th, 2019, 5:53 am

Cap installed backwards, wrong spec caps since you're using a kit, bad solder joint, solder bridge, etc.

There's quite a lot that could've went wrong, your best bet is going to be to go back over your work carefully and verify capacitor location, values, and polarity.

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grantspain
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Re: Ms9 died after installing a cap kit

Post by grantspain » February 11th, 2019, 8:53 am

if the chassis was fully working before the cap kit you have either installed a cap incorrectly( either polarity or value) or have bridged traces with solder
if the chassis was not functioning correctly before the cap kit then the vertical ic la7837 is bad

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copados33
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Re: Ms9 died after installing a cap kit

Post by copados33 » February 11th, 2019, 11:12 am

I think I have found the problem, it vould be the liquid silicone that I used to fix a ceramic cap under the LA7837, that could explain the vertical collapse before the shutdown.

Should I remove the gunk and test or do I need to replace LA7837 straight ahead?

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Re: Ms9 died after installing a cap kit

Post by grantspain » February 11th, 2019, 11:41 am

i doubt the silicon caused it unless its conductive, i expect the la7837 was about to fail in any case

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Re: Ms9 died after installing a cap kit

Post by copados33 » February 11th, 2019, 1:50 pm

I didn't use solid silicone but a liquid one that I had lying around that needs some time to dry.

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Re: Ms9 died after installing a cap kit

Post by PunkicCyborg » February 11th, 2019, 6:34 pm

I had a MS8 collapse after a cap kit a couple years ago. Replaced the vertical hold IC and it fixed the issue and was fine ever since

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copados33
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Re: Ms9 died after installing a cap kit

Post by copados33 » February 11th, 2019, 11:23 pm

chibishin wrote:
February 11th, 2019, 5:53 am
Cap installed backwards, wrong spec caps since you're using a kit, bad solder joint, solder bridge, etc.

There's quite a lot that could've went wrong, your best bet is going to be to go back over your work carefully and verify capacitor location, values, and polarity.
I checked and double checked the solder joints, the caps I installed were the correct uf, but higher voltage, which AFAIK is ok to do, example: original cap was 2.2uf 35v, I installed a 2.2uf 50v, I just wanted to put 105°C rated ones.

As I posted earlier I think I have found the problem, now I'm waiting for the LA7837 to arrive, we'll how it goes...
PunkicCyborg wrote:
February 11th, 2019, 6:34 MP
I had a MS8 collapse after a cap kit a couple years ago. Replaced the vertical hold IC and it fixed the issue and was fine ever since
hope I can fix this one that way.

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Re: Ms9 died after installing a cap kit

Post by chibishin » February 12th, 2019, 4:31 am

copados33 wrote:
February 11th, 2019, 1:50 MP
I didn't use solid silicone but a liquid one that I had lying around that needs some time to dry.
yeah a non-neutral cure silicone could be a problem

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