#BackFromDead - Twitter Hashtag

about 2 months ago

Everything is fried! The console was entrusted to me by Magno LA who could no longer take care of it — get well soon man. It originally belonged to Fred Christopher. #neogeo #aes #backfromdead Fault summary: following the use of an MVS adapter combined with a NeoSD Pro, the console fell into click-of-death shortly after… (basically a console feature indicating the 68000 is in a bad state — one or more main components is not responding as it should) The console wanted to take a vacation but this isn’t the time 😂 Diagnosis details below for the impatient ones 😝 😭 — here are the dead components: Z80 dead 68000 dead Neo-B1 dead LSPC2-A2 (unconfirmed) Work RAM dead (x2) Fast VRAM dead (x2) Diagnosis details: I started with a possible widespread short circuit — the cause can be multiple: incorrect power supply to the board, dead components, main crystal dead. Note: the LSPC2 had already been replaced. I first check the voltages across the main components (BIOS, CPU, YM2610…) and at the output of the power supply circuit — OK. I check all the clocks at the Neo-D0 output, responsible for dividing the 24MHz to feed the other chips — OK. I pull out the Briconeo: first impression, I’m having a lot of trouble running diagnostics on the 68k side (echo, etc.), I’m getting random bus responses on the 68k work RAM, palette RAM, VRAM and fast VRAM diagnostics… The Neo-C1 diagnostic responds well, the LSPC2 beta diagnostic too. I do have a click-of-death telling me something is wrong somewhere and that the console is rebooting trying to recover a good state 😭 However the reset doesn’t seem to respond… the bus might be too busy… So we’re thinking one or more little troublemakers are disturbing the 68000 bus… or several components that may have fried. I go back over the entire board under the microscope — it’s a long process… First step: check what has been modified or replaced. Remove the BIOS to fit a new socket, check for trace cuts, same for the LSPC2-A2. Probe all the TTL circuits (74x…) with the oscilloscope, the BIOS and everything that can interact with the 68k bus. I pull out the thermal camera — an essential tool sometimes… I have a hunch…: the Z80 is running very hot (40°C+), the 2K fast VRAM (40°C+) as well, and this is affecting the internal temperature of the LSPC2 on the right. Two new 2K fast VRAMs are fitted on sockets, and the Z80 is replaced and also socketed. Testing the Z80 in the tester — confirmed dead. Testing the 2K fast VRAMs in the tester — confirmed dead. The replacement is confirmed post-install by a more appropriate temperature reading. Smells like a short circuit that took out components in a chain 😭 While we’re at it, we replace the Neo-B1 too… and we get a more correct display: no more scrambled black image (which looked like a clock issue…) but a slightly pink click-of-death and a reset that works! That’s positive 🎉 We spend 2–4 hours sweeping the entire board on both sides: what’s causing this click-of-death? Given that everything looks fine trace-wise — double checked… We pull out the oscilloscope again and go through the 68k address and data bus — I have some inputs stuck at 0 regardless of reset or anything else… My gut says: let’s swap out this 68k. It’s fairly rare for this kind of component to fry, but there might be a corroded trace underneath — who knows… A new 68k is socketed and swapped in… We get a nice black screen! Well then 🙂 We put in the diagnostic BIOS and the M1 Z80 cartridge, and we get a diagnostic display with sound indicating the Z80 is working but that one of the 68k WRAMs is dead… (this is the 68k’s working RAM where the code lives, etc.) The lower work RAM is KO… we replace both… And we get a working console back 😅😅😅 This one came back from the dead 😀

nic0344's tweet photo. Everything is fried! The console was entrusted to me by Magno LA who could no longer take care of it — get well soon man. It originally belonged to Fred Christopher.

#neogeo #aes #backfromdead

Fault summary: following the use of an MVS adapter combined with a NeoSD Pro, the console fell into click-of-death shortly after… (basically a console feature indicating the 68000 is in a bad state — one or more main components is not responding as it should)

The console wanted to take a vacation but this isn’t the time 😂

Diagnosis details below for the impatient ones 😝 😭 — here are the dead components:

Z80 dead
68000 dead
Neo-B1 dead
LSPC2-A2 (unconfirmed)
Work RAM dead (x2)
Fast VRAM dead (x2)

Diagnosis details:

I started with a possible widespread short circuit — the cause can be multiple: incorrect power supply to the board, dead components, main crystal dead. Note: the LSPC2 had already been replaced.

I first check the voltages across the main components (BIOS, CPU, YM2610…) and at the output of the power supply circuit — OK. I check all the clocks at the Neo-D0 output, responsible for dividing the 24MHz to feed the other chips — OK.

I pull out the Briconeo: first impression, I’m having a lot of trouble running diagnostics on the 68k side (echo, etc.), I’m getting random bus responses on the 68k work RAM, palette RAM, VRAM and fast VRAM diagnostics… The Neo-C1 diagnostic responds well, the LSPC2 beta diagnostic too.

I do have a click-of-death telling me something is wrong somewhere and that the console is rebooting trying to recover a good state 😭

However the reset doesn’t seem to respond… the bus might be too busy… So we’re thinking one or more little troublemakers are disturbing the 68000 bus… or several components that may have fried.

I go back over the entire board under the microscope — it’s a long process… First step: check what has been modified or replaced. Remove the BIOS to fit a new socket, check for trace cuts, same for the LSPC2-A2.

Probe all the TTL circuits (74x…) with the oscilloscope, the BIOS and everything that can interact with the 68k bus.
I pull out the thermal camera — an essential tool sometimes… I have a hunch…: the Z80 is running very hot (40°C+), the 2K fast VRAM (40°C+) as well, and this is affecting the internal temperature of the LSPC2 on the right.
Two new 2K fast VRAMs are fitted on sockets, and the Z80 is replaced and also socketed.

Testing the Z80 in the tester — confirmed dead.

Testing the 2K fast VRAMs in the tester — confirmed dead. The replacement is confirmed post-install by a more appropriate temperature reading.
Smells like a short circuit that took out components in a chain 😭 While we’re at it, we replace the Neo-B1 too… and we get a more correct display: no more scrambled black image (which looked like a clock issue…) but a slightly pink click-of-death and a reset that works! That’s positive 🎉

We spend 2–4 hours sweeping the entire board on both sides: what’s causing this click-of-death? Given that everything looks fine trace-wise — double checked…

We pull out the oscilloscope again and go through the 68k address and data bus — I have some inputs stuck at 0 regardless of reset or anything else…

My gut says: let’s swap out this 68k. It’s fairly rare for this kind of component to fry, but there might be a corroded trace underneath — who knows… A new 68k is socketed and swapped in…

We get a nice black screen! Well then 🙂
We put in the diagnostic BIOS and the M1 Z80 cartridge, and we get a diagnostic display with sound indicating the Z80 is working but that one of the 68k WRAMs is dead… (this is the 68k’s working RAM where the code lives, etc.)

The lower work RAM is KO… we replace both… And we get a working console back 😅😅😅

This one came back from the dead 😀

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Tyson @havinknots

12 months ago

#backfromdead

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ǤΔΜ€ ŁØV€Ř @game_lover_edit

over 1 year ago

👹Devil Never Dies🥶 . . . . . #EndIsJustTheStart #GhostShip #JackFerriman #Demon #scary #NotDead #HorrorThriller #HorrorCommunity #horrormovie #StillAlive #BackFromDead #Villain #DarkSide #ALIVE

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Sejal Jain @shitpost_ing101

almost 3 years ago

Would rather start tweeting again than joining threads. #backfromdead

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XLR8

@overthinkerdude

over 3 years ago

After 5 years of being a Twitter silent observer, I've finally mustered up the courage to tweet! I'm now ready to tackle the never-ending scroll with new energy 💪 #BackFromDead

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Debasmita Ghosh @debasmitakeyag

over 3 years ago

Saree days, sorry faces 😂 #office #ThrowbackThursday #latepost #backfromdead #diwali2022 #toichennai #editdesk

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上ちゃん　健康第一 @uechan_1107

about 4 years ago

HALESTORNの新作を聴きBack from the dead中！ #halestorm #backfromdead

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Zhomwher @AnimalLyingNft

about 4 years ago

Hey @frankdegods, if you aped into @OthersideMeta, why don't you try other side of life on Solana? They are crawling back from there.⚡️⚡️⚡️ @TheOasisCivil #backfromdead #NFTCommumity

AnimalLyingNft's tweet photo. Hey @frankdegods, if you aped into @OthersideMeta, why don't you try other side of life on Solana? They are crawling back from there.⚡️⚡️⚡️
@TheOasisCivil #backfromdead #NFTCommumity https://t.co/uyUlXgtgEw

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flu @fluu03

almost 5 years ago

@RealKyroh @designsbyaqua wow #reformed #backfromdead

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Izaiah Haslett @IzaiahHaslett

over 5 years ago

#BACKFROMDEAD🦾 #TWIN

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Izaiah Haslett @IzaiahHaslett

over 5 years ago

#BackFromDead🆙

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Nikhil Lad @lollylad11

over 5 years ago

If your are keen to know what happened with #SubhasBose & #shastriji please read below books. #IndiasBiggestCoverUp #Yourprimeministerisdead #conundrum #backfromdead Start Your New Year With India's Real Liberator #Netaji125 #HappyNewYear2021 @anujdhar @chandrachurg

lollylad11's tweet photo. If your are keen to know what happened with #SubhasBose & #shastriji please read below books.
#IndiasBiggestCoverUp #Yourprimeministerisdead
#conundrum
#backfromdead
Start Your New Year With India's Real Liberator
#Netaji125
#HappyNewYear2021
@anujdhar @chandrachurg https://t.co/HsNoIcFPSU

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AURA24 ✖ AURA-STUFF @Aura245

over 5 years ago

✅Auslosung Halbfinale:✅ Bis zum 29.11. das Halbfinale spielen! Edit: #EXE und #BackFromDead spielen Donnerstag

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Bala_Iyer_S99🇮🇳🇮🇳 @BALAKI99

almost 6 years ago

#BackfromDead idhu yenna nu yarukavadhu triyum aa please reply me #MSDhoni #Valimai

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Steve Lavin

@SteveLavin64

over 6 years ago · Los Angeles

Still early but @PCFriarsmbb is ballin! Trajectory has Friars Tournament bound! Ed Cooley has a knack for inspiring late season runs! No one resurrects teams within a season better than Easy Ed! #BackFromDead #Lazarus #Alchemist @marchmadness @BIGEAST @FS1

Susan Falvey @FalveyKStars

over 6 years ago

@SteveLavin64 What do you think of that @PCFriarsmbb start ?? Getting it going!!

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Weeene Girl C: @Weeene

over 6 years ago

Im finally back from the dead and back at streaming, say what? Chilling with music and diablo 3 season 🙆 #season19 #diablo3 #casualplaythrough #levling #farming #twitch #live #backfromdead #necromancer https://t.co/XJpE1GUWal

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René @realDaredevilAC

over 6 years ago

Habe heute die #WalkingDead Folge von Montag nachgeholt. Ich kann mich nur wiederholen: Wer in den letzten Staffeln (verständlicherweise) ausgestiegen ist, gebt der Serie wieder eine Chance. Ab Staffel neun ist es wieder gut! #backfromdead

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#GangGreenNation @Shen_Update

almost 7 years ago

✖️RISE AND SHINE FELLAS AS OUR MONSTER FOOTBALL TEAM TAKES ON NISKAYUNA TN@7 ON OUR TURF🤫✖️💜POP OUT IN YO PURPLE TO SUPPORT JP💜 #billysboss #backfromdead #getloudorgohome

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