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#1 |
New Member
Join Date: Aug 2014
City & State: Birmingham AL
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![]() Slight click when power button is pressed, HD spins up for 1/2 a second, then shuts down. Obviously, it is trying to power on, because the HD spins up for a 1/2 second. I don't suspect any shorted diodes or semi's. I do not have a schematic, or I could do the troubleshooting myself. Please feel free to be very technical. I have an ESR meter, and a Hakko 880 de-soldering machine.
This is a 240W power supply, and has been replaced with a newer power supply, the APPLE 661-4478, an almost identical 250W version which includes a "pressure wall" which probably has to do with airflow.
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Michael Kinnaird 43+ years I.E.E.E A/V tech |
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#2 |
Leaking Member
Join Date: Dec 2014
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![]() Since you have an ESR meter, check them capacitors. I see a few that look like they ran hot. Are there more caps under these heat sinks? Maybe check the secondaries if they are putting out. Looks like they are two 12V rails and a 24V rail.
Last edited by CapLeaker; 02-21-2016 at 07:51 PM.. |
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#3 |
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![]() I took the power supply out.
I had to cut the heatshrink off the 2 33uf 35V caps with a sharp exacto knife. I found the following ESR values: 33UF 35V (130°) X2 - 1.0 ohms 100uf 35V - 0.5 ohms 220UF 35V X2 - .25 ohms 820UF 25V - .25 ohms 470UF 16V - .25 ohms 1000UF 16V X6 - .1 ohms 150UF 50V - .25 ohms 120uf 450V X2 - .25 ohms All caps are RubyCon 105° caps, except the 33uf 35V ones. Seems like they are all within spec for these caps. Meter: Electronic Design Specialists 88A In-Circuit DCR ESR Cap Analyzer Last edited by mkinn; 02-21-2016 at 09:32 PM.. |
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#4 |
Great Sage 齊天大聖
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![]() they dont sound in-spec to me.
what series are those rubycons? |
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#5 |
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![]() 33UF 35V (130°) X2 - 1.0 ohms - RX30
100uf 35V - 0.5 ohms - (PW)P 220UF 35V X2 - .25 ohms - (HD)P 820UF 25V - .25 ohms - ZLH 470UF 16V - .25 ohms - (PW)P 1000UF 16V X6 - .1 ohms - ZLH 150UF 50V - .25 ohms - ZLH 120uf 450V X2 - .25 ohms - BXA |
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#6 |
Great Sage 齊天大聖
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![]() there is no way a ZLH should have esr that high.
1000/16 for example, should be 0.029 NOT 0.1 Last edited by stj; 02-22-2016 at 12:08 AM.. |
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#7 |
Badcaps Veteran
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![]() But is the ESR meter able to show anything below 0.1??
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#8 |
Great Sage 齊天大聖
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![]() these need to be re-tested off-board too.
i suspect they are a bit cooked. |
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#9 |
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![]() Complete recap, same problem.
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#10 |
Great Sage 齊天大聖
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![]() make a list of the chips on the underside.
it could be an op-amp or voltage comparater on the way out tripping a false error. |
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#11 |
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![]() i am stuck with the same smps what i want to know the pfc boosting cap what is the voltage i get 334Volts generally should be 390V.on dap017 on pin 2 i get 3volts pin no 16 just 6.2 volts.Does anyone know the valuve for zd36 near d2 & Q2
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#12 |
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![]() what a bout ic's voltages???
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