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Author Topic: Misc Computers  (Read 8676 times)

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Offline channelmaniac

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Misc Computers
« on: December 18, 2014, 10:14:51 PM »
Model: Raspberry Pi
Symptom: Dead

Replaced broken L5 coil on the bottom of the board and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #1 on: December 18, 2014, 10:17:12 PM »
Model: Raspberry Pi
Symptom: Parts, smashed unit.

Board had bad physical damage. Replaced Leaking C6, broken connector S2, broken video jack at S4, bent USB port at S8, and bent Ethernet port at S7. Replaced bent DIP header at P1 and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #2 on: January 31, 2015, 09:07:46 PM »
Model: Sharp X68000 Super w/Xcellent 30S
Symptom: CPU burns fingers. System will not boot with 68030 installed

Replaced dead 68030 CPU and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #3 on: April 09, 2016, 10:59:22 PM »
Model: Atari 800
Symptom: Dead keyboard

Keyboard lines looked good with a logic probe but the computer wouldn't recognized any key presses. Resoldered the power headers on the power supply board and main board to fix cracked solder issues then replaced a defective 6520A PIA chip. Tested.

Supplied Galaxian cartridge would not work. Cleaned edge connector and successfully played the game.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #4 on: July 02, 2016, 11:08:50 AM »
Model: SuperMicro Dual Xeon computer
Symptom: Won't power on

Computer would just beep and immediately shut off the power. Removed the heatsinks/fans from both CPUs and reseated them in their PGA sockets.  Reinstalled the CPUs and powered up the computer successfully but had no video. Replaced bad video card and retested successfully.

The Intel PGA style Xeon CPUs have problems with the CPUs becoming disengaged from their sockets when the systems are shipped and/or dropped. This computer traveled 1700 miles in a bouncing trailer. :)
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #5 on: February 12, 2017, 10:43:15 PM »
Model: OSEPP FTDI RS-232 Interface for Arduino
Symptom: Dead. Connector was pulled from the board

Cleaned the SMT pads on the board and the connector then resoldered the connector to the board. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #6 on: February 12, 2017, 10:44:15 PM »
Model: Inland FT232 FTDI RS232 Interface for Arduino
Symptom: Dead. Smoked

Replaced an open surface mount coil on the USB 5v line and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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Re: Misc Computers
« Reply #7 on: April 08, 2017, 08:40:44 PM »
Model: Dell XPS 700
Symptom: Dead

Replaced 8 popped electrolytic capacitors on the main logic board and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #8 on: June 25, 2017, 05:54:16 AM »
Model: Gateway T3124
Symptom: HDD errors in PST file

Opened the case on the shop email/EPROM burning PC (Windows XP!) to replace the hard drive and discovered multiple bad caps. Replaced 5 1500uf @ 10v and 3 1500uf @ 6.3v capacitors, replaced the hard drive with an SSD, and migrated the data. Rebuilt the Outlook PST file to fix errors and disabled the Windows Updates service to fix a CPU spiking issue.

Downloaded months of emails to wade through.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #9 on: August 11, 2017, 10:04:03 PM »
Model: PCjr 128K Memory Expansion
Symptom: Modify it to 512K memory

Desoldered 16 4164 DRAM chips, installed 16 sockets, and inserted 16 41256-12 DRAMs. Desoldered the pads for memory expansion jumpers, cut a trace between 2 of the pads, installed the headers and the jumper for 512K. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #10 on: September 19, 2017, 07:28:01 PM »
Model: Sharp X68000
Symptom: Poor sync signal

Replaced bad 74ALS05 IC in the sync output circuit and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #11 on: January 14, 2018, 04:11:13 PM »
Model: Macintosh SE/30
Symptom: 4 broken SIMM sockets.

Replaced broken SIMM sockets and gave board back to local owner for testing.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #12 on: June 30, 2018, 01:32:01 PM »
Model: Intel SDK-86
Symptom: Dead, garbage on LEDs

Replaced several missing jumpers and tested. Display shows -Err. Repaired stuck ':' key on key pad and performed the system Checkout Procedure listed in the assembly manual.

NOTE: If W36 - W38 jumpers are not installed, CPU will not boot. If W40/W41 jumper is not installed, CPU will not have its clock.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #13 on: June 30, 2018, 01:33:01 PM »
Model: Intel SDK-86
Symptom: 'Err' on display

Repaired stuck ',' key on key pad and performed the system Checkout Procedure listed in the assembly manual.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #14 on: June 30, 2018, 01:39:28 PM »
NOTE: Intel SDK-80 Keyboard Troubleshooting

When the display shows -Err there is a stuck key. To find the key you can try to turn the unit upside down and use a multimeter on continuity test mode to find the switch.

Sometimes the switch will only show stuck when the board is right side up. When this happens, use a logic probe on pins 38, 39, 1, 2, 5, 6, 7, and 8 of the Display/Keypad controller IC. These pins should read high when no keys are pressed. When you find one that is flipping logic states then you narrowed down the stuck keys to three possibilities. If your logic probe has audio beeps then press each of the three keys while listening. There will be a subtle change in audio for good keys and no change when you press the stuck key.

The keys can be desoldered and carefully disassembled. There is a brass piece inside that can be very gently lifted up about 1/16" and they key reassembled. Test the key out of circuit then before it's reinstalled, power up the computer and if there are no more stuck keys you'll be at the standard prompt "- 86 1.1". Resolder the key switch back in circuit and follow the Checkout Procedure listed in the assembly manual to test all the keys and the display elements.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Misc Computers
« Reply #15 on: March 10, 2019, 08:53:24 PM »
Model: Commodore PET 2001
Symptom: Dead, garbage on screen

Replaced 2 bad video RAMs with an adapter and a 6116 SRAM chip to fix the video issues. Used a Fluke 9010A with the 6502 pod to test the system. Replaced a bad 74LS04 driving the address lines to the RAM to fix RAM DCD (decoding) errors found by the Fluke system. System would intermittently boot but with no cursor. Replaced a bad 74154 to fix RAM read errors when the 2nd bank of 4K RAM was added. The RAM tests would then fail again with RAM DCD errors on the Fluke. Reinserted the 6520 for the keyboard in the proper direction - it was in backwards. This returned the cursor and keyboard function when the system would boot and resolved the RAM DCD errors on the Fluke.

Replaced the CPU socket and a bad CPU to fix the boot problem. Installed the replacement RAM/ROM module and used the self test function on it to test the system. Removed the OEM ROM and RAM chips and set the replacement module to boot BASIC 4.0 and use its 32K SRAM chip. Tested again then reassembled the system.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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Re: Misc Computers
« Reply #16 on: March 25, 2020, 07:38:21 PM »
Model: SDS Z80 Starter Kit single board computer
Symptom: Dead. Filthy. Some jammed keys.

Took it apart, removed all the dirt crusted sockets, cleaned the board, installed new sockets, then put it back together. Took 3 of the key banks (4 each) apart and fixed the jammed keys.
Replaced 1 21L02 RAM that failed out of circuit testing. Replaced another 21L02 that read 3.3K to the +5v line on A3 when all the others read 9.9K (10K pull up resistors were in the circuit.) Powered it up and it's still dead.

Started digging through the circuitry and noticed it would die when toggling the display / keyboard circuit. Another bank of keys that felt OK were actually shorted on 2 keys. Like my SDS-86 single board computer, this won't boot if keys are pressed. Disassembled this shorted key switch bank and fixed the bent wires inside the switches. Reassembled, disassembled and redid the wires again, then put it back together successfully.

Powered it on and was greeted with the '-' prompt
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Misc Computers
« Reply #17 on: August 26, 2020, 10:19:17 PM »
Model: Timex Sinclair 1500
Symptom: No response from keyboard

Keyboard had a cracked mylar film, typical of these. Procured a replacement then installed and tested it successfully.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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  • Few things are better than fixing an old game...
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Re: Misc Computers
« Reply #18 on: October 09, 2020, 06:03:26 PM »
Model: DTK XT Clone
Symptom: Missing BIOS chip

Replaced missing BIOS chip and installed a jumper on the key lock pins to let keyboard work. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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Re: Misc Computers
« Reply #19 on: October 09, 2020, 10:50:05 PM »
Model: DTK 'PIM-Turbo' XT Clone
Symptom: Will not boot

Replaced shorted Tantalum cap on the +12v line after it popped. Replaced corroded slot connector. Board would pass all diagnostics using the test BIOS until the CGA RAM test when it would fail and lock up. Inspected board and found a gouged trace on the bottom. Patched the trace with a short piece of Kynar wire and replaced a popped Tantalum cap on the -12v line. Board now passes all tests and boots.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

 

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