HP bc402nw dag35nmb8c0 rev.C

[reassor]

mobo : dag35nmb8c0 rev.C

Quick 1 blink of screen when powering up. Then no picture at all.
After bios reset same + 4 restarts and it stays that way.

Reflashed bios with 1 i extracted and matched by $BID (just old one)

Same thing. screen flashes once then 4 restarts and it sits like that

No picture thru HDMI too.

Any ideas?

[reassor]

Re: HP bc402nw

Found out that 1 mosfet is not beign drived at all around CPU. There is 5 chokes 4 of them got around 1v 5th have 0v. Mosfets are E6930 Drived by AYJJ 036 - any 1 know what that is?
(other mosfets get 1.5v on 1 gate this one gets nothing)

MOBO has no element markings like "r123" "PU03" "PQ9" - there is nothing on it. Im not a pro so im learning as i go

This mobo is on intel and schematic i found is for amd so no use

Will try to find this AYJJ thingy :P on other board or just swap with other one and see.

[SMDFlea]

Re: HP bc402nw

The AYJJ is a Monolithic Power MP8693GDT-Z ,there`s no datasheet available. The marking code part number is AYJ ,the other letter is a date code or lot number, AYJK AYJJ AYJF .

.

[reassor]

Re: HP bc402nw

thank you will look into it in the morning

[reassor]

Re: HP bc402nw

Found 2 old posts on other forums where they had picture but still no voltage on that choke so i moved on.

VGA : N17P-G0-A1

Got 3 chokes with 0.7 OHM :O 0.8v on each
one big choke 20 OHM 0.8v
Last 1 is gddr so here i got 79 OHM and 1.3v

Did not measure voltages at "init" since i had to take off cooling cause its very hard to stick probes under it. So these voltages are at the very power on.

Question: Are those resistances OK? (looks too low for me)

[SMDFlea]

Re: HP bc402nw

I found a thread at chinafix with the same problem, https://www.chinafix.com/thread-1269465-1-1.html ,i found a schematic with both IC`s mentioned in the thread, MP8693GDT and MP2949A ,i posted it in the schematics requests https://www.badcaps.net/forum/showthread.php?t=96274

[reassor]

Re: HP bc402nw

I found a thread at chinafix with the same problem, https://www.chinafix.com/thread-1269465-1-1.html ,i found a schematic with both IC`s mentioned in the thread, MP8693GDT and MP2949A ,i posted it in the schematics requests https://www.badcaps.net/forum/showthread.php?t=96274

Thx. What ya think about those ressistances on VGA? - i never can figure out how low is good

Fixed acer nitro yesterday and radeon had 2.2ohm

[SMDFlea]

Re: HP bc402nw

The 1000 series will measure under 1 ohm

[reassor]

Re: HP bc402nw

The 1000 series will measure under 1 ohm

thx

[reassor]

Re: HP bc402nw

LOL windows starts but no display - tried bunch of diffirent bioses - now i think its GPU. Im assuming by lack of votage on 5th cpu coil means disabled UMA.

When i plug in some usb i hear win detect sound.

When i plug in HDMI there is no detect sound.

WIERD LOL

EDIT: DEAD LCD