OJ's H5 A3 Troubleshooting

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JezC
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Re: OJ's H5 A3 Troubleshooting

Post by JezC »

Glad you've sorted it!

Also stops me making the same mistake with the second H4 & my H5 B1... :lol: :roll:
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olivier.jan
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Re: OJ's H5 A3 Troubleshooting

Post by olivier.jan »

Glad it helped someone :)
Now, looking at the pinout, one should be able to use the original IC by swapping pin 4 and pin 5 and bringing power to pin 6. But not really sure it’s worth it unless one is in desperate needs to get it working without waiting for parts...
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olivier.jan
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Re: OJ's H5 A3 Troubleshooting

Post by olivier.jan »

Forget what I said about swapping 4 and 5.
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
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olivier.jan
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Re: OJ's H5 A3 Troubleshooting

Post by olivier.jan »

Hi, This morning I took my H5 out of storage and discovered it didn't boot.
Plugging the Diag cart I manage to get a display which is normal at first then stays stuck on "Testing MFP, etc...." with artefacts on the screen :-(

Here is a short video :



(BTW, I didn't find how to attach videos directly).

I suspect the MFP as I've always had issues with the MFP on the H5 and I'll start the usual troubleshooting but if someone has a clue or seen this before it can save me a lot of continuity testing...
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
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olivier.jan
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Re: OJ's H5 A3 Troubleshooting

Post by olivier.jan »

I checked continuity on all MFP pins but didn't find any issue.
I tried in Mono mode (changing JP4) and instead of being stuck on Testing MFP I immediately get E7 Spurious Interupts.
Booting without diag cart,in Mono gives me many bombs and in colour mode I have a black screen with frequency changing between 50 and 70 hz continuously :-(
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
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PhilC
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Re: OJ's H5 A3 Troubleshooting

Post by PhilC »

@olivier.jan try serial and see if you get any further info. Does sound like a poor connection on a chip
If it ain't broke, test it to Destruction.
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derkom
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Re: OJ's H5 A3 Troubleshooting

Post by derkom »

olivier.jan wrote: Sun Mar 13, 2022 4:02 pm (BTW, I didn't find how to attach videos directly).
You can't, not really. Inlining YouTube or Vimeo as you've done is the right thing to do.
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rubber_jonnie
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Re: OJ's H5 A3 Troubleshooting

Post by rubber_jonnie »

PhilC wrote: Sun Mar 13, 2022 10:10 pm @olivier.jan try serial and see if you get any further info. Does sound like a poor connection on a chip
I'd second this suggestion, diag cart and serial out, it may show that the machine is running and has a video fault, or may highlight something else.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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