Re: Help needed in fixing a graphics card

Posted on Yesterday, 17:37

by

by Karbist

in Marvin \ Video

in Marvin \ Video

Measure every zero ohm and 56 ohms resistor around the ram chips on both side of pcb, they are in form of single resistors and resistor arrays. it's annoying task but you might get lucky and find an open resistor.

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Re: No beep codes from motherboard

Posted on 2024-04-24, 07:44

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

johnvosh wrote on 2024-04-24, 00:32: I removed the chipset heatsink and everything was looking good, no discolouration. It could be the angle of the camera and light.... The copper on back of the board beneath the north bridge has darker color in your pic. Filename IMG_0702.JPG File size 46.52 KiB …

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Re: No beep codes from motherboard

Posted on 2024-04-23, 18:58

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I see discoloration under the north bridge, hopefully solder joints are not cracked under the chip, not a big fan of nForce motherboards with passive cooling.

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Re: Help needed in fixing a graphics card

Posted on 2024-04-21, 13:06

by

by Karbist

in Marvin \ Video

in Marvin \ Video

stealthjoe wrote on 2024-04-21, 04:41: Thank you for the values. I am assuming the smd cap is a ceramic one with no specific polarity marked. Can you please confirm? Thanks. Yeah mlcc cap size 0603.

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Re: Help needed in fixing a graphics card

Posted on 2024-04-20, 21:08

by

by Karbist

in Marvin \ Video

in Marvin \ Video

Is there a method for determining these values that you could share with those of us who aren't very experienced at this sort of thing? I have a bunch of ati 9250, so that was easy to find the value but even without a similar card you can easily guess the correct value, the Q3 and Q4 are horizontal …

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Re: Help needed in fixing a graphics card

Posted on 2024-04-20, 18:53

by

by Karbist

in Marvin \ Video

in Marvin \ Video

R400=6.8K C53=100nf

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Re: Chaintech CT-7NJL4 power rails shorted to ground

Posted on 2024-03-20, 16:05

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

280 ohms is pretty good, so there's hope that southbridge is not toasted. I would start measuring the mosfets source and drains on those rails.

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Re: Chaintech CT-7NJL4 power rails shorted to ground

Posted on 2024-03-20, 14:17

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Only southbridge chipset is connected directly to the main 3.3v and 5v rails. measure the resistance between standby 3.3v to the ground on pin no. 14 of any pci slot: 3.3.jpg this is boardview for Asus A7n8x if you are interested in nforce 2 power rails. A7N8X-E.rar open it with http://boardviewer. …

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Re: GeForce4 4200 ti with a Busted Memory Leg - Repairable?

Posted on 2024-03-14, 07:33

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You can gently shave away the plastic with a hobby knife, then push the broken leg back to its place and solder it. although chip seems to have suffered from an Impact, you might need to replace it.

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Re: "Greasey" 6800GT AGP - is this normal?

Posted on 2024-03-10, 23:30

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This is the preheater I have, Gordak 853: https://www.aliexpress.com/item/1005002785030658.html 3 in 1 version, Gordak 863: https://www.aliexpress.com/item/1005001711285885.html but if you plan to work on motherboards you need something bigger like T8280.

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Re: "Greasey" 6800GT AGP - is this normal?

Posted on 2024-03-10, 12:00

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This topic reminded me that I still have an artifacting Gigabyte 6800GT PCIe stored somewhere, so I dug it up and this is how post screen looked like: post.jpg So I put the card on the pre-heater, applied hot air and chip was floating right at 190C. ran furmark for few minutes and card reached 80C ( …

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Re: Intel D865PERL cpu stuck in RESET, no post

Posted on 2024-03-04, 08:20

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It would be better to take measurement without the cpu in the socket, there are some weird readings in your post, source of high side mosfets is connected to drain of low side mosfets and you say they have 2.4 and 4 ohms. also source of low side mosfets is connected to the ground and you say it has …

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Re: Intel D865PERL cpu stuck in RESET, no post

Posted on 2024-03-03, 18:33

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So it's getting the enable signal but there's no cpu vcore. Are you using the right cpu for this board? some of these boards don't work with willamette P4, only Northwood and Prescott. the next step is to check the mosfets, you need to measure the resistance between the gate leg of each mosfet to …

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Re: LGA 775 Motherboards with AGP Slots

Posted on 2024-03-03, 12:15

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

gregorem wrote on 2024-03-03, 11:30: Could you guys recommend me something similar in specs to GA-8I865GME-775-RH but in full ATX (or at least easier to find)? Gigabyte GA-8I865PE775-G-RH rev 3.0 or 4.9 Only Asrock and Gigabyte have full ATX boards.

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Re: Intel D865PERL cpu stuck in RESET, no post

Posted on 2024-03-03, 10:15

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

kotel wrote on 2024-03-03, 09:41: On L4B1 inductor (next to the 4 pin CPU power) it measures 12.3v. On both L3B1 and L1B1 its 0v. I also forgot to mention that the speaker after mobo turn on clicks 1 time. Do you have at least 1.2v on pin 11 of pwm IC (ADP3168)? Filename PWM.jpg File size 104.94 …

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Re: Intel D865PERL cpu stuck in RESET, no post

Posted on 2024-03-02, 18:22

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On output pin the voltage is 3.26v. Mesuring the resistance form: output pin to ground shows 487 ohms input pin to ground shows 2940 ohms Any ideas? The resistance on standby 3.3v is pretty good. about the cpu is not getting warm, have you measured the 2 the inductors near the cpu socket to verify …

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Re: Intel D865PERL cpu stuck in RESET, no post

Posted on 2024-03-02, 07:30

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Under the Intel logo is where the chip usually dies, you need to measure the resistance between the 3.3v standby rail to the ground, I think this is where the 3.3v from PSU 5v standby gets created: 3.3.jpg you need to verify it with your multimeter then disconnect the atx connector and measure the …

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Re: Intel D865PERL cpu stuck in RESET, no post

Posted on 2024-03-01, 20:56

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does the north bridge heatsink gets quickly hot or it just stays warm? also leave the board running for 1 minute and put your finger on the south bridge chipset and see if one spot on the chip is getting hot.

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Re: Soltek SL-75KIV not posting with Athlon 1Ghz

Posted on 2024-02-28, 18:00

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If cpu was not confirmed to be working by the seller, it probably is dead. it would be nice to submit your board photo to the retroweb since they don't have one.

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Re: Identify slot 1 processors without the cartridge

Posted on 2024-02-26, 14:21

by

by Karbist

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

jnemo2004 wrote on 2024-02-26, 13:26: Only one more question: Do you know the reason why the people remove the cartridges? Thank you again. Regards noob recyclers salvage the aluminum heatsink and sell the board to pro recyclers for gold recovery, specially those PII cpus have the highest amount of …

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