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ziko07
Senior Member
Last Activity: 02-24-2024, 07:44 PM
Joined: 06-05-2021
Location: Somewhere
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  • As I see both 1v0 and 1v8 goes to gpu maybe there is problem but once was all voltage ok,that's strange to me
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  • r9 280 no picture and shorts coils

    Hi, I have this graphic card no image, when power on fans spin but I measured and has only +12v from PCI and power 12v both connectors. also +5v linear present, 3v3 from PCI present. MCU is cold, then I I tried measure again and on coils, 1.5V,1v0, 1.8v, on mcu 0.8v all present and mcu slictly warmed up. After that I tried to put on motherboard and still no image, but now also all those voiltages missing again , only +12v present and 5v
    Then I measured (see image in red colour) and all those coisl has dead shorts, 0 ohm. I thing when first measuring voltage (I didnt check resistance) was...
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  • There was short on gate of both FETs, when removed IC short gone, must find that IC to test, hope not processor dead.
    0.6V that shows on cpu coils actually not have PWM on one side of coil at all. Now I lift one side of coil, resistance from mcu core VDD to GND is only 5R8, not know is it normal or also processor gone

    Tnx
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  • i found what going mad hot , its IC ISL95831 PWM controller for CPU core, but cpu core voltage 0.6v present, or maybe its low voltage for cpu??...
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  • No liquid damage, just died, here is image with voltage and resistance on power coils. 5v alw and 3v3 have resistance more then 5k and both power draive ~90mA when bring external desired voltage on coils...
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  • Asus K53SD restart,no picture

    Hi, I have this laptop when insert charger battery charging is on andcwhen press ON button,power led lights 1-2 sec and goes off. I opened and reset bios,after that power ked is on and 2,3 more leds is on but after 6sec restart and loops constantly same (only charger insert,without press power button). As I see no more battery charging led is on. It draws 370-450mA. All power present, on cpu cire 0.6v only missing power is gfx core.
    any help?
    Pcb is rev 6.0, I put bios 5,1 and after that found here 6.0 but no changes on laptop behaviour
    Tnx
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  • Re: Asus strix gtx980

    Strange, 2 coils for memory chips has dead short, zero Ohms but when inject 0.8V 5A no any component get hot...
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  • Asus strix gtx980

    Hi I had this card not work, not found short on high side fets,gpu core 0v8 present but not have pover 2 coils that are in same row withbthis,not know if they are for memory power or else. As I see fets gate are driving by uP1631p. 5v vcc is present on driver, 1v2 enqble pin also present but no pulses to gates.

    Any info or datasheet for driver?

    Tnx


    P.S. off topic I also repaired sapphire, shorted IR3553M. I replaced but that phase not work, I found also not pulse from driver. Other IR3553M has pulse IN. But later 2 more IR3553M gone and there is IN...
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    Last edited by ziko07; 11-14-2023, 01:08 PM.

  • Re: La-7912p second board

    PCH has no cooler but getting quickly pretty hot
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  • Re: La-7912p second board

    Hi, board power on ok but after 30-50 seconds all 3 usb stop working. On external keyboard led goes off and I see when I put freeze spray at pch keyboard leds works ok but shortly and goes off again
    Is it pch damaged?
    When put external power without battery and lcd it takes 28mA,isn't that much?
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    Last edited by ziko07; 10-04-2023, 12:19 PM.

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  • La-7912p second board

    Hi

    I openet new topic becouse now diferent problem to this board
    Board power On , and without Ram module has CPU_CORE 1.2V on both phases
    But when insert Ram memory in slot then board has power On with cpu_core and restart and once again core is 1.20v and then drop and no more cpu_core present.
    At this point I can see also on RAM that DIMM_DRAMRST# is missing (but think this should not affect cpu_core missing)
    All voltage is OK on RAM except [pin-30]

    Like something other couse problem,but this happend only when insert memory
    ...
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  • Re: La-7912p

    update: I get other ddr3 memory. put and finaly 0.45v on gfx and picture comes
    now boart takes 08-0.9A before 0.65A

    second board with new ram, it comes and goes off twice, in that time cpu core present and lost, "without ram memory cpu_core is present"
    VR_ON signal is present
    Any sugestion?

    both board has same flash in both flash memory
    now will play with second board

    Tnx to all
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    Last edited by ziko07; 09-18-2023, 06:55 AM.

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  • Re: La-7912p

    I saw on YouTube when missing gfx they put external buck convertor. Can I try,what voltage exactly need?

    Tnx
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  • Re: La-7912p

    Tried with screen,hdd,hdmi and not work, no image
    Also when insert usb keyboard caps lock is not light
    On DIMM_DRAMRST# has 1.5v, shouldn't be half voltage 0.75v ?
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  • Re: La-7912p



    I will search for screen to test that's I asked becouse can't be 2 boards same problem after repair other problems
    Tnx...
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  • Re: La-7912p

    I apologise for too many posts but I do car electronics, this is new for me.
    So,one board has shorted main rail, I fixed
    Second led comes ON but missed CPU_CORE voltage, I found open resistor because +5VS was missing, I fixed that too.
    Now....both boards fixed (were different problems) and both have no vgfx_core, so my final question is: is it possible because no screen connected? Because I doubt both boards now to have same problem after fixing other problems on them

    P.S. please see also above post, about no 3v3 on pgoodg line
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    Last edited by ziko07; 09-15-2023, 01:50 PM.

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  • Re: La-7912p

    There is PGOOD and PGOODG
    First is enable for CPU_CORE, second is for +VGFX_CORE
    As you can see from image on working cpu_core on both sides or resistor there is 3v3
    On not working PGOODG is 3v3 form one side of resistor only

    Resistance +VGFX_CORE to GND is 16 Ohms
    When board are powered take 650mA and I can see PCH getting hot and not have heat sink on it

    Also I put usb keyboard and no any light on keyboard, with both boards.
    5v is present on usb port...
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    Last edited by ziko07; 09-15-2023, 01:15 PM.

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  • Re: La-7912p

    UPDATE:
    -first board had shorted first fet and shorted CAO on main rail (repl and and laptop start but no voltage on +VGFX_CORE coil

    -second ahd power but no VCC_core, and I saw no +5VS on CPU controler pin, actually +5vs was missingfrom +5valw to +vs, and found open 20k resistor (see image)

    Summary, now both boards has all power except voltage on +VGFX_CORE coil
    I not have LCD and testing on external HDMI but no have picture of course

    Now any other ingo about +VGFX_CORE

    Tnx...
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  • Re: La-7912p

    its, 19.2v (not have ori adapter) I use labaratory bench power
    Speak for second board, but firs also has 19v powe rail OK
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  • La-7912p

    Hi, I have 2 same bords for repair
    -On first one I founded shorted first fet and a shorted CAP to mail rail. I tought will be ok but there is missing +VGFX_CORE voltage. Same controler for +VGFX_CORE and +CPU_CORE
    +CPU_CORE is present on both phases. I found 15 Ohms on UGATE1G on controler that drive highside fet (on other board this pin is in kohms)
    Can be only this part of controler shorted internally?

    -second power led ok when press button VR_ON present but no +CPU_CORE

    First board take 28mA,what I think its much second board only 8mA,before pwrbtn...
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    Last edited by ziko07; 09-15-2023, 09:50 AM.
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