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| Zotac 1050 2gb mini - help finding 1.8V bios https://vlab.su/viewtopic.php?f=48&t=101969 |
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| TheMArcos [ 24 апр 2020, 04:51 ] | |
| Заголовок сообщения: | Zotac 1050 2gb mini - help finding 1.8V bios |
Hello guys, the card does not have Vcore, Vmem, Pcivdd and enable in up9509, looking for something wrong I saw that 1.8v is not coming on pin 1 and 8 of the bios, it is generated by the component in the photo below, replaced component, but same behavior without 1.8 v on bios, resistance on pin 1 and 15k on pin 8 of 1.5k, could someone instruct me what to look for now? continuity of the voltage regulator to pin 8 of the bios. |
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| dennis85 [ 24 апр 2020, 05:58 ] | |
| Заголовок сообщения: | Re: Zotac 1050 2gb mini - help finding 1.8V bios |
Can you remove 1.8V regulator and provide 1.8V/0.2A from laboratory power supply in to 4-8pin SPI flash(without any other supplies)? What a current consumption will be? |
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| TheMArcos [ 25 апр 2020, 07:07 ] | |
| Заголовок сообщения: | Re: Zotac 1050 2gb mini - help finding 1.8V bios |
dennis85 писал(а): Can you remove 1.8V regulator and provide 1.8V/0.2A from laboratory power supply in to 4-8pin SPI flash(without any other supplies)? What a current consumption will be? hi,sorry for the delay, is that i can only work on cards 22:00 ~ 01: 00am brasilia time, i removed the regulator and injected 1.8v the consumption current was 0.500mA on pin 8, is this normal? |
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| dennis85 [ 25 апр 2020, 07:31 ] | |
| Заголовок сообщения: | Re: Zotac 1050 2gb mini - help finding 1.8V bios |
TheMArcos писал(а): i removed the regulator and injected 1.8v the consumption current was 0.500mA on pin 8, is this normal? If 0.5mA(NOT "0.5A", like a 500mA) - normal. But why your linear regulator U504 doesn't give 1.8V(maybe it broken)? "Z08N" - that marking chip was on board from manufacture? Can't find information for that chip. 
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| TheMArcos [ 25 апр 2020, 07:50 ] | |
| Заголовок сообщения: | Re: Zotac 1050 2gb mini - help finding 1.8V bios |
I have another identical pcb, and the chip has another nomeclature, (image), I have already inverted them and continued the same thing, I am suspicious of a broken track, if I only heard 1.8v on the regulator output I would try a jumper, but only I have 0.4mV. |
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| dennis85 [ 25 апр 2020, 08:12 ] | |
| Заголовок сообщения: | Re: Zotac 1050 2gb mini - help finding 1.8V bios |
Possible you doesn't have enable voltage on it LDO. Can you look and write pinout/voltages for this IC? p.s. board on photos have a lot of places with serious corrosion defects - maybe some traces/components is damaged? |
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| TheMArcos [ 26 апр 2020, 06:39 ] | |
| Заголовок сообщения: | Re: Zotac 1050 2gb mini - help finding 1.8V bios |
follows the tensions found the black ones are the ones in the regulator, the yellow ones are the ones that should be (compared to another similar board) |
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| dennis85 [ 26 апр 2020, 07:09 ] | |
| Заголовок сообщения: | Re: Zotac 1050 2gb mini - help finding 1.8V bios |
Friend, this IC is not 1.8V creator. Look and measure other voltages from selected ICs (on attached images). |
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| TheMArcos [ 27 апр 2020, 03:20 ] | |
| Заголовок сообщения: | Re: Zotac 1050 2gb mini - help finding 1.8V bios |
dennis85 писал(а): Amigo, este IC não é criador de 1.8V. Procure e meça outras tensões dos CIs selecionados (nas imagens anexas). you are right, I calmly analyzed the pcb and saw that there was no enable on the uP1727, so it replaces the resistor marked red because when I obese on the other board and then comes the enable for the Regulated, and then the enable and all the other board voltages went up, but it didn’t show video, I believe there is a defect in the memories or the gpu. is it possible to use mats on vgas that do not output video? |
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| dennis85 [ 27 апр 2020, 03:28 ] | |
| Заголовок сообщения: | Re: Zotac 1050 2gb mini - help finding 1.8V bios |
Firstly look on VGA bios for compatible with your board. Mats easy can use as second vga on MB. |
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