[SOLVED]820-3115-b , green light, does not turn on , P3V3S5_EN_L missing

[turbo]

this 3115-b board had little water damage , now fully cleaned,

5v and 3.3v is missing,

on Q7221 pin5 P3V3S5_EN_L is missing , but there is P5VS3_EN_L on pin2


P3V3S5_EN_L taking me to to U7941


U7941 here is pin voltage

1=3.49v
2=3.49v
3=3.47v
4=0v


5=0v
6=3.34v
7=0v
8=3.47

any idea why P3V3S5_EN_L missing??

 

[dukefawks]

P3V3S5_EN_L is supposed to be missing hence the L. So either a short on 3V3 bus or bad 51125 or corroded trace around it.

 

[turbo]

here is the voltage on u7200 pin
pin 1 is 0v !!!! and pin 9-7.70v


1. 0
2. 0
3.2v
4. 3.34v
5. 2v
6. 0.78v
7. 3.34v
8 3.34v
9. 7.70v
10. 3.34v
11. 3.34v
12 0v
13. 3.47v
14. 2v
15 0v
16. 12.6v
17 5v
18 un coneected

 

[dukefawks]

You say 3V3 is missing yet there is 3V3 on pin 11. This makes no sense.

 

[turbo]

ya i just notice that too, but 5v missing for sure ,

 

[arghhh]

P3V3S5_EN_L is supposed to be missing hence the L. So either a short on 3V3 bus or bad 51125 or corroded trace around it.

Sorry to hijack this, but question about the _L thing: Isn't PM_SLP_S4_L supposed to be high? Is it just a misnomer?

 

[dukefawks]

I need some dependable measurements. Not this crap you are feeding me now.

Where was the liquid damage? Voltages on RTC circuit R18001/2/3? Checked all coils for shorts?

 

[dukefawks]

SLP is sleep so is low in "sleep" or inactive. So out of sleep it should be high.

 

[turbo]

No Title

Pls chk the pic , water damage was around that area

rtc circuit is which one ,

 

[turbo]

I changed the 51125 still no result , you are right problem is some where else I guess

 

[dukefawks]

Miniature pictures, useless.

 

[turbo]

No Title

 

[turbo]

how ot upload full size pic !!! or any email i can sen you pic ?

 

[SMMRepair]

Upload to imgur, post link.

 

[turbo]

http://imgur.com/01MUdFp
http://imgur.com/KqQAHgE

 

[turbo]

Miniature pictures, useless.

i uploded some new pic with link, pls chk link

 

[dukefawks]

Pictures show nothing. You did not answer my previous questions, it seems you know better.

 

[turbo]

also here is no good one and good one u7200


fixing ------------------------------good one [TABLE="border: 0, cellpadding: 0, cellspacing: 0"]
[TR]
[TD="width: 123, align: right"]0[/TD]
[TD="width: 130, align: right"]1.15[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[TD="align: right"]2[/TD]
[/TR]
[TR]
[TD]2v[/TD]
[TD="align: right"]2[/TD]
[/TR]
[TR]
[TD]3.34v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]2v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]0.78v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]3.34v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]3.34v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]7.70v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]3.34v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]3.34v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]0v[/TD]
[TD="align: right"]0.63[/TD]
[/TR]
[TR]
[TD]3.47v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]2v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]0v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]12.6v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]5v[/TD]
[TD]same[/TD]
[/TR]
[TR]
[TD]18 un coneected[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[TD="align: right"]0.061[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[TD="align: right"]5[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[TD="align: right"]5.1[/TD]
[/TR]
[TR]
[TD="align: right"]4.4[/TD]
[TD="align: right"]9.81[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[TD="align: right"]3.3[/TD]
[/TR]
[TR]
[TD="align: right"]0[/TD]
[TD="align: right"]5[/TD]
[/TR]
[/TABLE]

 

[dukefawks]

I didn't ask you this and this is all useless info.

 

[turbo]

Any help from any one ?????