Editing Atari 130XE General Maintenance (section)

== Common Failure-Prone Components ==

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|+'''Atari 130XE Common Failure Points'''
! Component !! Part Number !! Location !! Symptom !! Notes
|-
| DRAM (early board) || 4164 / TMS4164 || U4–U19 || Black screen, garbage display, random crashes || Touch-test for overheating; piggyback to diagnose
|-
| DRAM (late board) || 41464 / MT4067 || U4–U7 || Same as above || 4 chips instead of 16
|-
| GTIA (NTSC) || CO14805 || U20 || No video, wrong colours, graphics glitches || Usually not socketed; consider adding socket
|-
| GTIA (PAL) || CO14889 || U20 || Same as above || Chinese-made XEs had faulty GTIAs — replace
|-
| ANTIC (NTSC) || CO21697 || U7 || No display, vertical bars, no DMA || May be socketed on some boards
|-
| ANTIC (PAL) || CO21698 || U7 || Same as above ||
|-
| POKEY || CO12294 / CO12294B || U22 || No sound, keyboard dead, SIO failures || Handles audio, keyboard, serial I/O, and paddle input
|-
| PIA || CO14795 / 6520 || U23 || Joystick ports dead, bank-switching broken || Controls joystick I/O and RAM bank selection
|-
| FREDDIE || CO61991 || U6 || No boot, memory access failures || Memory controller for DRAM timing
|-
| MMU || CO61618 || U3 || No boot, address decoding errors || PAL-based address decoder
|-
| EMMU || CO25953 || — || Extended memory not accessible, RAM disk fails || Extended memory bank controller (130XE specific)
|-
| OS ROM || CO61598B || U5 || No boot, no READY screen || 16 KB operating system
|-
| BASIC ROM || CO24947A || U4 || No BASIC prompt, boots to blue screen only || 8 KB Atari BASIC Rev C
|-
| 7805 voltage regulator || 7805 || Near power input || Overheating, shutdown, voltage drift || Replace with modern low-dropout regulator
|-
| Keyboard membrane || — || Under keycaps || Dead keys, intermittent response || Replace membrane; aftermarket replacements available
|}