820-00138 no power no green light

techgeeksna

New member
Good Day, got a 820-00138 board, has history of water damage, board was cleaned off, not getting a green light and no power. what will i need to check?
there is no pp3v42
and pp20v_dcin_fuse - 16.7V
adapter sense 0V
 

techgeeksna

New member
UPDATE:

DIODE MODE U7100
PIN17/18 - 3.4 Ohms
PIN27/28 - 20,9 Ohms

Voltages on U7100
2 - 16.5V
3- 3.8V
19-5.54V
20 - 5.54V
1 - 0.01V
26- 14.32V
9 - 0.02V
15- 0V
 
Last edited:

Gurmon

Member
Lets start with restoring 3.42v rail. Have you checked for any shorts on this line ?

Diode mode measurement on L7090
Voltage on R7020 ?
 

techgeeksna

New member
Hi are you dure about L7090, doesnt seem the be on this board
R7020 Pin 1 16.7V and Pin 2 0.27V. Looks corroded so ill replace that now.
 

techgeeksna

New member
Gurmon Great News replaced R7020 and machine fired right up :D:D. everything seems to be working as should however the machine does appear to be running rather slugish. Has anyone come across such an issue after water damage.
 
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