Apple IIe Platinum NTSC boot displays hatch pattern /no beep?

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Apple IIe Platinum NTSC boot displays hatch pattern /no beep?

Hi guys hopefully i can get some direction to get our Apple IIe platinum (607-0288) International NTSC back to life.

 

Was in storage for a few years now when i turn it on - no beep and we get a hatch display with squares? Thick lines horizontally & vertically? Trying to run self diagnostics we get PP randomly with again a hatch pattern but with characters?

 

Power light is on

HAL 16R8CN chip gets hot?

Replaced CPU with a spare known working - no change

Anyone have any idea what we need to look at to get it back to life?

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update - advised to replace the ram?

I have been advised to replace the two ram (TMS4464-15NLA) which are soldered in so will not be easy , before I order replacements anyone else have any other tips to investigate?

Thanks

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Make sure the keyboard cable

Make sure the keyboard cable is connected properly.  If it isn't a //e will get stuck in the self test.

 

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Keyboards checked but no change

Hi yes tried 2 keyboards, both same result.... the screen did change slightly a few times and the red motherboard led light up briefly as indicated previously with lower case pp followed by 2 square graphic and repeated itself to fill the screen will upload photos ..

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Error screen
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Have you metered the power

Have you metered the power supply yet?  That's usually the first thing you should do.  Incorrect voltages will cause all sorts of failures.

 

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Update

Have tried a spare power supply (known working) still get the same result, but will check output again, Sadly dont have a scope to test further so will try piggy back ram first once the new dram arrives as I dont have any 464 spares so will report back. I cant remember where I saw the exact same display reported by another person who reported that it related to dram failure...

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