Dell 1564 Chassis NO.: DELL UM3B Power on No display
Posted: Wed Sep 27, 2017 4:44 pm
Brand Name: Dell
Model NO. : Dell 1564
Chassis NO.: DELL UM3B
Problem Reported : Power on No display
PSU Reading : 0.85 Amp
Observation : Bios Pin no.2 Falling Short as Compared to a working Board
SPD Data Clock Signal exist but not a complete cycle along with LAD –3 but No FRAME Or SERIRQ
First Try To Cleaning RAM slot with another working ram No way . Then Bios Flash and it is done SPD Signal Now Detect Ram identity and LPC FRAME , SERIRQ along With LAD 0-3 Cycle Good with current in PSU 1.25 Display Ok
For Reference See Attached Few DSO Testing Video
Bios pin 2 & LAD3 Signal Before Bios Flash
https://www.youtube.com/edit?o=U&video_id=iLt_0D1a7YI
Ok Frame Signal After Bios Flash
https://www.youtube.com/edit?o=U&video_id=z-FbileW0E4
SPD Signal Before bios Flash
https://www.youtube.com/watch?v=vIkTVPAWLD4
Ok SPD Signal After Bios Flash
https://www.youtube.com/watch?v=y2JVcUoGyCQ
Model NO. : Dell 1564
Chassis NO.: DELL UM3B
Problem Reported : Power on No display
PSU Reading : 0.85 Amp
Observation : Bios Pin no.2 Falling Short as Compared to a working Board
SPD Data Clock Signal exist but not a complete cycle along with LAD –3 but No FRAME Or SERIRQ
First Try To Cleaning RAM slot with another working ram No way . Then Bios Flash and it is done SPD Signal Now Detect Ram identity and LPC FRAME , SERIRQ along With LAD 0-3 Cycle Good with current in PSU 1.25 Display Ok
For Reference See Attached Few DSO Testing Video
Bios pin 2 & LAD3 Signal Before Bios Flash
https://www.youtube.com/edit?o=U&video_id=iLt_0D1a7YI
Ok Frame Signal After Bios Flash
https://www.youtube.com/edit?o=U&video_id=z-FbileW0E4
SPD Signal Before bios Flash
https://www.youtube.com/watch?v=vIkTVPAWLD4
Ok SPD Signal After Bios Flash
https://www.youtube.com/watch?v=y2JVcUoGyCQ