Ps4 12xx persistent blod

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Ps4 12xx persistent blod

Postby exwilliam » Thu Jul 06, 2017 1:10 am

Hi to all.
This one came in with pulsing blod.
I reflowed but no changes.
So reballing was the remaining option.
First reball:I got blod and instant off.
Second reball: pulsing blod again like when it came in.
Third and fourth reball : still pulsing blod.
I'm out of ideas on this one.
Do you guys have any clue what to do?
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Ps4 12xx persistent blod

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Re: Ps4 12xx persistent blod

Postby gkop » Sun Jul 16, 2017 7:35 pm

more than likely dead apu. you can try swapping with a donor apu to see if it revives. if so, then you know apu is your issue. you can also try vapu resistance test. lots of info in previous threads for how to. I find under the apu at caps to be the easiest. However, Im still uncertain on how reliable this is a have good and bad apus that test at different
and similar readings.

If only we knew the right engineer to slip a benji. :tumbleweed:
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Re: Ps4 12xx persistent blod

Postby exwilliam » Sat Jul 22, 2017 1:15 am

Thx for the reply mate.
Now how to test APU?
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Re: Ps4 12xx persistent blod

Postby gkop » Sat Jul 22, 2017 8:43 am

Your asking the million dollar question. Im tempted to shell out for a custom socket for apu... But my supplier wants a couple of grand. Thats the sure fire way to test.

For a crude test u can take an ohms reading of smd componets on the underside of apu. Resistance should measure high on most chips and none of the others below 10-12ohms. Also test for continuity between ground planes on the different sectors of apu. I will upload a pic of a sanded apu belly for better clarity of section divisions.

Additionally you can test VAPU which can be easily discovered by applying standby power and probing for voltage in. Resistance varoes based on pin orientation,but main vapu always reads for me between 3.95 and 4.2. Cross leads and resostance reads around 1.95.

Fair warning: resistance readings are not an accurate estimate of apu health. Wildly off readings are clear indicators of issues, but most readings for me hvent added up to any definitive conclusion. Im sure that one day when the service manual is leaked we will all have an "ah-ha" moment and beat ourselves for missing the obvious.

If you believe apu is good, then its possible you have board warp. Once u get into the 4-5 rework cycle range warping becomes inevitable. The only way to combat this implement some kind of pcb support. (pcb support must be level, so a machine support jig is best and not the Chinese junk. Those will warp the boards worse than nothing at all)
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Re: Ps4 12xx persistent blod

Postby bart961 » Sun Aug 27, 2017 1:34 am

I asked some of my connections for a APU testing jig, $4500 for the APU, but over $10k for every chip to have a socket (south bridge, APU, syscon, NOR flash)
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