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HP 450 G6 (Quanta X8J DA0X8JMB8E0 Rev E DSC) Water Damage, identify of 2 chips https://vlab.su/viewtopic.php?f=53&t=137666 |
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mohammedsf [ 13 окт 2023, 05:08 ] | |
Заголовок сообщения: | HP 450 G6 (Quanta X8J DA0X8JMB8E0 Rev E DSC) Water Damage, identify of 2 chips |
Hello masters.. this board came water damaged, DA0X8JMB8E0 Rev E with discrete graphics, cleaned and restored except those two chips: #1 marked "ZU8KA" and #2 marked "AE" Вложение: DA0X8JMB8E0.jpg Location on DA0X8JMB8E0 DSC Вложение: Quanta X8J DSC 8E0.jpg #2 was easy to identify, a simple 2-input AND gate, it is a 74AHC1G08GW - datasheet Вложение: 74Ahc1G08Gw.jpg No schematics / boardview of Quanta X8J was found to identify chip #1 but identical chips was found in a different location on photos of DA0X8JMB16E0 "UMA", sadly no schematics / boardview too: Вложение: Quanta X8J UMA 16E0.jpg accidentally i've found that this part of the board (DA0X8JMB16E0) is identical to the design of Quanta X8M (DA0X8MMB6D0) and the boardview is available: Вложение: Quanta X8M BDV.jpg so we have the pinout of those chips now by studying the design and matching to the schematics of Quanta X81 i can confirm now that chip #1 (ZU***) = MC74VHC1G08DFT2G - datasheet BUT!!! according to the schematics chip #2 is also MC74VHC1G08DFT2G ?! which is a simple 2-input AND gate too.. note that both are supplied by +3v Вложение: Quanta X81.jpg went back to Quanta X8M's boardview and found that the difference is that MC74VHC1G08DFT2G (ZU***) is supplied by +5v while 74AHC1G08GW (AE) is supplied by +3v, but according to the datasheets both chips can handle 5v supply and i didn't find any differences so i'm lost at this point what's the difference between those two, or did i identify them incorrectly ?? |
jocker [ 13 окт 2023, 13:16 ] | |
Заголовок сообщения: | Re: HP 450 G6 (Quanta X8J DA0X8JMB8E0 Rev E DSC) Water Damage, identify of 2 chips |
another scan x8j-6l - zu*** = vt. mc74vhc1g08. >> Location on DA0X8JMB8E0 DSC >>>>> |
Serguz05 [ 13 окт 2023, 13:18 ] | |
Заголовок сообщения: | Re: HP 450 G6 (Quanta X8J DA0X8JMB8E0 Rev E DSC) Water Damage, identify of 2 chips |
I can’t see from the photo which body it is. sot23-5 or less. |
mohammedsf [ 13 окт 2023, 20:01 ] | |
Заголовок сообщения: | Re: HP 450 G6 (Quanta X8J DA0X8JMB8E0 Rev E DSC) Water Damage, identify of 2 chips |
jocker писал(а): >> Location on DA0X8JMB8E0 DSC >>>>> this photo is from DA0X8JMB16E0 UMA, in the discrete board 8E0 the location is different.. it helped a lot :-ok-: in your photo ZU*** = VT & AE = V2 by studying the datasheets everything become clear: ZU*** = VT = CE = 74AHCT1G08 = MC74VHC1GT08 <- TTL Compatible Input AE = V2 = 74AHC1G08GW = MC74VHC1G08 <- non-TTL so they are not interchangeable :co_ol: Serguz05 писал(а): I can’t see from the photo which body it is. sot23-5 or less. SOT-353 Posted after 4 hours 50 minutes 32 seconds: MC74VHC1G08DFT2G found and installed 74AHCT1G08 found in SOT23-5 package (74AHCT1G08DBVR) and installed board started perfectly :co_ol: input supply voltages measured on this platform (DA0X8JMB8E0 Rev E DSC): MC74VHC1G08DFT2G pin#5 = 5v MC74VHC1GT08DFT2G pin#5 = pre-init 1.2v , after-init 1.35v thx :-ok-: |
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