Why only two LEDs on my computer are lighted

Question

iMac G5 17" Model A1058

1.6, 1.8, 또는 2 GHz G5 프로세서

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Highsheep @highsheep

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게시일: 2024년 3월 2일

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Why only two LEDs on my computer are lighted

I acciently pluged 220V, and the power supply bombed... and I replaced it with a good-working one. But only LED1 and LED2 are lighted, fans aren't worked, and only harddisk is still working. I tried three different RAMs and I'm sure Ram is OK. What's the problem???

답변되었습니다! 답변 보기 저도 같은 문제를 겪고 있습니다

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예 아니요

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@highsheep have you had a chance to look at the logic board yet? Time to tear it apart and check for damage. There are plenty of capacitors that will take a hit on the 220V. Might be time to recap the beast anyway. We really need to see this board to assist you with that. Luckily schematics and board views should be available, we just need to know what your exact board number is. I suspect a 820-1540 All you have to bring to the table are the soldering skills and obtaining components :-)

Once you have your board removed. Take some good pictures (top and bottom) and post those with your Question. That way we can see what you see. 기존 질문에 이미지 추가하기

oldturkey03 의 2024년 3월 2일

@oldturkey03 I put my pictures below

Highsheep 의 2024년 3월 2일

@highsheep I guess it turned out to be a 1540 and they promptly place a sticker over it :-)

oldturkey03 의 2024년 3월 2일

@highsheep you will need this for sure. LB# 820 1540 Start with the power block diagram and see if you get a feeling for it. Then take a look at all of the power rails (focus on page 7) Inductors and voltage regulator love to get destroyed in overvoltage situations. Anyhow, you will have to be okay with reading schematics, and basic testing of components. We can always assist but you are the hands, eyes and ears of this operation ;-)

oldturkey03 의 2024년 3월 2일

@oldturkey03 Thanks, I'll have a try

Highsheep 의 2024년 3월 2일

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Dan @danj

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Ouch! Sounds like the logic board got hit as well.

Not much you can do here, either replacing the logic board or if you have the skills fixing the damaged circuits within it.

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예 아니요

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댓글 3개:

Acutally I want to fix it by myself, I really enjoy the process. Can you give me some tips about it?

Highsheep 의 2024년 3월 2일

@highsheep - you’ll need to surf the web to find the schematics and board drawings so you can ID the components and the voltages of the power rails to help narrow down things.

If you look at the logic board you should find it’s number it typically starts off as 820-???? Use that to search by.

Dan 의 2024년 3월 2일

@danj Thank s fir your help

Highsheep 의 2024년 3월 2일

댓글 달기

@highsheep have you had a chance to look at the logic board yet? Time to tear it apart and check for damage. There are plenty of capacitors that will take a hit on the 220V. Might be time to recap the beast anyway. We really need to see this board to assist you with that. Luckily schematics and board views should be available, we just need to know what your exact board number is. I suspect a 820-1540 All you have to bring to the table are the soldering skills and obtaining components :-)

Once you have your board removed. Take some good pictures (top and bottom) and post those with your Question. That way we can see what you see. 기존 질문에 이미지 추가하기 — oldturkey03
@highsheep I guess it turned out to be a 1540 and they promptly place a sticker over it :-) — oldturkey03
@highsheep you will need this for sure. LB# 820 1540 Start with the power block diagram and see if you get a feeling for it. Then take a look at all of the power rails (focus on page 7) Inductors and voltage regulator love to get destroyed in overvoltage situations. Anyhow, you will have to be okay with reading schematics, and basic testing of components. We can always assist but you are the hands, eyes and ears of this operation ;-) — oldturkey03
Acutally I want to fix it by myself, I really enjoy the process. Can you give me some tips about it? — Highsheep
@highsheep - you’ll need to surf the web to find the schematics and board drawings so you can ID the components and the voltages of the power rails to help narrow down things.

If you look at the logic board you should find it’s number it typically starts off as 820-???? Use that to search by. — Dan

iMac G5 17" Model A1058

Why only two LEDs on my computer are lighted

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