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Author Topic: [Solved] Repair / LA-6847P Rev : 1.0 / Shorted  (Read 5410 times)

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Offline Rasz

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Re: Repair / LA-6847P Rev : 1.0 / Shorted
« Reply #25 on: August 24, 2018, 09:50:28 am »
why? according to what you already measured problem is not on power rails
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Offline xanTopic starter

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Re: Repair / LA-6847P Rev : 1.0 / Shorted
« Reply #26 on: August 24, 2018, 03:43:24 pm »
 ::) of course... infact i have this readings... i have only to confirm pj20 value, i discover it was desoldered (and i forgot it to solder back):palm:... i keep close it and test again..  :popcorn:
« Last Edit: August 24, 2018, 05:12:24 pm by xan »
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Offline xanTopic starter

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Re: Repair / LA-6847P Rev : 1.0 / Shorted
« Reply #27 on: August 24, 2018, 04:36:05 pm »
After solder to close pj20 power is stable,  all the 2 led (1st power/suspend 2nd batt charge/full led thought battery is disconnected, i never try pull it back for now) are on green state and remain on green light for all 10 minutes during the machine power on, fan near gpu start spin and stop after but in few seconds temp grow and start spinning faster at full rmp, seems all it's ok! but still no video, no boot...
« Last Edit: August 24, 2018, 05:14:15 pm by xan »
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Offline Rasz

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Re: Repair / LA-6847P Rev : 1.0 / Shorted
« Reply #28 on: August 25, 2018, 01:10:51 pm »
put a scope/ logic analyser on bios lines and see if its being loaded
or buy a post code card for laptops
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Offline xanTopic starter

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Re: Repair / LA-6847P Rev : 1.0 / Shorted
« Reply #29 on: August 27, 2018, 06:08:47 pm »
no scope  :-\... i just try to reload bios with usb key and wincrisis utility to have a fresh bios firmware... but unlucky for now... pressing Fn+B, power cord plugged and power on, fan start spinning faster for few seconds, then stop itself.... but no luck  :palm: everythings is the same but now Fn+B just make half second fan spinning and then stop... and i think the flashing procedure not really start..
Another impression, keyboard seems to work, but no lights for caps-lock and num-lock... try the common Ctrl-Alt-Del... obviously nothing happens, machine stay turned on.
« Last Edit: August 27, 2018, 09:08:00 pm by xan »
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Offline xanTopic starter

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Re: Repair / LA-6847P Rev : 1.0 / Shorted
« Reply #30 on: August 28, 2018, 05:56:14 pm »
1) What kind of test equipment do you suggest ?
(seems a pcie tester is the faster and cheaper solution, but i don't see around some half mini-pcie equipmet so a standard mini pcie should work without screw it on the board right)

2) With some kind of post debugger should i solder on motherboard debug pinout ? or simply put into mini pcie the debugger ?
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Offline Rasz

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Re: Repair / LA-6847P Rev : 1.0 / Shorted
« Reply #31 on: August 29, 2018, 12:26:09 am »
afaik for laptops you plug into LPC (https://en.wikipedia.org/wiki/Low_Pin_Count) or dedicated debug port
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Offline xanTopic starter

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Re: Repair / LA-6847P Rev : 1.0 / Shorted
« Reply #32 on: August 29, 2018, 09:02:24 pm »
It's Done!! thank's for the tips i can't believe... i discovered i had bad soldering on pj8 and pj10 on vga_core  :palm: :palm: :palm: the code given from Debg post card suggest me to check that area again!
Anyway TYFAYS!  :clap: :clap: :clap: :clap: :-+ :-+ :-+ :-+ :-/O :-DMM c660 back to life!

(As you said before B+ after two fried Mosfet and a fuse short was only caps on B+)
« Last Edit: August 29, 2018, 09:18:13 pm by xan »
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