need board view + schematic for apple imac A1207 820-2031-a

[juni]

hello everyone im trying to fix this imac A1207 820-2031-a

when i turn it on he dozed boot only led 1 and 2 come on no fan spin

[juni]

Re: need board view + schematic for apple imac A1207 820-2031-a

no when i Resetting the SMU (System Management Unit)
1. Unplug all cables from the computer, including the power cord.
2. Wait 10 seconds.
3. Plug in the power cord while simultaneously pressing and holding the power button on the
back of the computer.
4. Let go of the power button.
5. Press the power button once more to start up your iMac

now fans start spinning hard and no image and led 3 does not come on

[howardc64]

Re: need board view + schematic for apple imac A1207 820-2031-a

Have same iMac with similar problem.

When plug power in, LED 1 stays on. LED 2 briefly blinks with fan twitch a little then repeat. This is without hitting power on switch.

Tried sequence in post #2, no luck. Same pattern as before.

Power board has a buzzing sound. Looking for schematic for it to diagnose further.

[piernov]

Re: need board view + schematic for apple imac A1207 820-2031-a

Here you go.