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History of 5150/5155/5160/5170 Motherboard Failure
at the Vintage Computer Forums



Link to Vintage Computer Forums is here.

Date Thread#Post Member Motherboard Cause   Comment
OCT06 4573 the xt guy 5150 RAM  
NOV06 5323 mR_Slug 5160 Tantalum cap  C56 (sits on +12V line)
JAN08 9601 dkedrowitsch 5170 BIOS ROM  Offline, determined that his 61X9265 EPROM had corrupted contents
MAR08 10510 crazypigeon 5150 Tantalum cap  One of six C6 on 16KB-64KB board. (+/- 12V lines)
  10510#11 flavio75 5160 Tantalum cap  
MAY08 10510#30 vwestlife 5150 Tantalum cap  64KB-256KB board. C7 nearest U5 (sits on -12V line).
MAY08 10961 dongfeng 5150 RAM  
JAN09 12538 Luke 5160 Tantalum cap  C58 (sits on -12V line)
MAR09 10961#12 tezza 5150 RAM  Last worked okay a few months previously.
MAR10 19696 rtwo 5155 BIOS ROM  U19
NOV10 22209#38 nestor 5150 RAM  64KB-256KB board. One faulty 4164 RAM chip in bank 0
JAN11 25230 Denniske1976 5160 Tantalum cap  C56 (sits on +12V line)
FEB11 24042#1 mikey99 5150 RAM  16KB-64KB board. One faulty 4116 RAM chip in bank 3.
MAR11 24223 framer 5150 BIOS ROM  U33
MAR11 23864#17 zoomgofstr 5155 RAM  
MAY11 25196 redhawk579 5160 Tantalum cap  C56 (sits on +12V line)
AUG11 26693#8 bettablue 5150 Tantalum cap  Multiple
DEC11 24042#8 mikey99 5150 RAM  One 4116 RAM chip. Same motherboard that failed in February.
MAY12 30371 DOS lives on 5170 RAM  Type 1 motherboard. One chip in bank 0.
MAY12 30521 CannedBread 5155 Tantalum cap  C58 (sits on -12V line)         (plus tantalum cap C8 on CGA card)
JUN12 31172 latvija13 5155 2 x tantalum caps  C56 (sits on +12V line) or C58 (sits on -12V line)  -  both removed
SEP12 32659 marcoguy 5160 RAM  No longer seeing RAM above 128 KB. Fix: Reseated RAM chips
OCT12 34083 madmaxamdam 5160 2 x tantalum caps  C56 (sits on +12V line) or C58 (sits on -12V line)  -  both removed
APR13 36547#54 PCFreek 5150 RAM  64KB-256KB board. One faulty 4164 RAM chip in bank 0
APR13 36547 PCFreek 5150 Multiple faults  16KB-64KB board #1. 74LS175 chip (U26) + faulty 4116 RAM chips.
APR13 36547 PCFreek 5150 RAM  16KB-64KB board #2. One 4116 RAM chip.
JUL13 38036 gkavner 5150 2 x tantalum caps  64KB-256KB board. Caps on +12V and -12V lines.
JUL13 38159 PCFreek 5150 Tantalum cap  16KB-64KB board. One of many caps on +12V line.
AUG13 38717#1 eXTended8088 5160 RAM  Faulty RAM in bank 0
AUG13 38814#12 framer 5160 Tantalum cap  C56 (sits on +12V line) or C58 (sits on -12V line)  -  both removed
AUG13 38893 camerongray 5160 Tantalum cap  C56 (sits on +12V line)
SEP13 39264 gkavner 5150 Tantalum cap  
NOV13 40187#22 giobbi 5160 Tantalum cap  C56 (sits on +12V line)
DEC13 40546#9 tezza 5160 Tantalum caps + RAM  C56 (sits on +12V line) and C58 (sits on -12V line) and faulty RAM in bank 0
JAN14 40780 Denniske1976 5160 2 x tantalum caps  C56 (sits on +12V line) and C58 (sits on -12V line)
JAN14 40814 VintageC 5155 Tantalum cap  C56 (sits on +12V line) or C58 (sits on -12V line)  -  both removed
JAN14 [email] Denniske1976 5160 Tantalum cap  C56 (sits on +12V line)
FEB14 41258 commodorejohn 5150 Tantalum caps  Caps on the +12V line and -12V lines
MAR14 41911 xave 5160 RAM  No longer seeing RAM above 64 KB.  Cause: Bad RAM chip in 64-128KB bank
MAR14 41950#8 awergh 5160 Tantalum caps  Caps on the +12V line and -12V lines
MAR14 42020#4 bjorn_and 5150 Tantalum cap  Cap on the -12V line
JUN14 43069 3pcedev 5160 RAM  
JUL14 43314 bobba84 5160 RAM  Via PM: "10 bad RAM chips".  5160 had been in a shed for 7 years.
AUG14 43857 PCFreek 5150 Tantalum cap  16KB-64KB board. One cap on the +12V line.
SEP14 44380#1 PCFreek 5150 Tantalum cap  16KB-64KB board #1.  One C6 (there are many C6's - used on both the -12V and +12V lines).
SEP14 44380#1 PCFreek 5150 Tantalum cap  16KB-64KB board #2.  Multiple C6 (there are many C6's - used on both the -12V and +12V lines).
SEP14 44504 codeman 5150 Tantalum cap  16KB-64KB board.
JAN15 46130 MauriceH 5160 RAM  No longer seeing RAM above 128 KB.  Cause: Bad RAM chip in 128-192KB bank
APR15 47099 Stone 5150 Tantalum cap  64KB-256KB board. The cap on the -12V line.
APR15 47254 romanon 5150 RAM  Faulty RAM in bank 0
APR15 46489 romanon 5170 keyboard controller  Faulty keyboard controller chip (U126)
MAY15 47399 gobabushka 5155 Tantalum caps  C56 (sits on +12V line) and C68 (sits on -5V line)
MAY15 47460 framer 5160 Tantalum cap + RAM  C56 (sits on +12V line) or C58 (sits on -12V line) - both removed.  Plus faulty RAM
MAY15 47524 Divad 5150 BIOS ROM + RAM  16KB-64KB board.  Faulty U33, plus faulty RAM in bank 0
AUG15 48683 vossi 5160 Tantalum cap  C56 (sits on +12V line)
AUG15 48788 Chromedome45 5150 RAM  Faulty RAM in bank 0
SEP15   elwro07 5155 Tantalum caps  C56 (sits on +12V line) and C58 (sits on -12V line)
NOV15 49825 Gerardcjat 5155 Tantalum caps  C56 (sits on +12V line) and C58 (sits on -12V line)         (plus tantalum cap C8 on CGA card)
NOV15 49771#37 A Fox 5160 IC  Faulty U27
NOV15 49771#38 A Fox 5160 IC + RAM  Faulty U11 and U20, plus six faulty 4164
DEC15 49160 fafonso 5150 RAM  Faulty RAM in bank 0
DEC15 50396 Ozzuneoj 5150 RAM  Faulty RAM in bank 0
FEB16 51365 offensive_Jerk 5150 RAM  Faulty RAM in bank 0
APR16 52129 gleegum 5160 Tantalum cap  C56 (sits on +12V line)
APR16 52130 offensive_Jerk 5170 IC  Type 1 motherboard.  Faulty MC146818P
APR16 52214 prime 5150 IC  16KB-64KB board.  Faulty U15 and U17 and U23.
APR16 52214#17 prime 5150 Tantalum cap  C7 nearest U5 (sits on -12V line).  Repaired in March.
SEP16 53993 astamp 5160 Tantalum cap  C58 (sits on -12V line)
NOV16 55099 lutiana 5170 RAM  Type 1 motherboard.  One chip in bank 0.
DEC16 55460 Flamin Joe 5150 Tantalum cap  "shorted Tantalums on the 12V rail"
JAN17 55697 offensive_Jerk 5150 Tantalum cap  Linked video showed the one on the +12V line.
MAR17 53091 gigabajcior 5170 RAM delay line  DS1010-200
MAR17 56687#39 paperinik77pk 5160 Tantalum caps + RAM  "two 12v tantalum capacitors and some bad 4164 chips"
APR17 57300 Microfinne 5160 Tantalum caps  C56 (sits on +12V line) and C58 (sits on -12V line)
MAY17 57827 RadRacer203 5150 Tantalum caps  C6 (sits on +12V line) and C7 (sits on -12V line)



Some of my own motherboard repairs (the ones that I have a record of).
All motherboards had a 'dead / no display' symptom.

Date Motherboard Cause   Comment
NOV08 5150 Faulty RAM chip  16KB-64KB board. One faulty 4116 RAM chip in bank 0
NOV08 5170 Faulty RAM chip  
AUG09 5150 Faulty 74LS138 chip  Thermal. Chip worked when cold.
JAN10 5150 2 x tantalum caps plus 3 x RAM chips  
FEB10 5160 RAM delay line