Hi guys
In my spare time to upskill myself I buy joblots if stuff to fix , or attempt fixing and get some experience
I have a r460 that I wanted to fix and give to my nephew
As shown there is a burned ferrite bead, next to a high/ low side VRM pair on the back side of the card
I'm gonna try replacing these pair of VRMs. I wondered how hard they are to remove
I have a decent sequire solder iron and hot air, though may need to get a hot plate.. Seems these VRMs have big contact plates and could be welded
Also seemingly...
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-
04-30-2024, 07:54 AM
-
I'll tell you right away, I don't understand much about electrical engineering. I have this laptop, the symptoms are as follows: when I press the power button it lights up for about 5 seconds and then goes out. The fans do not spin, there is no effect at all.
Here is what diagnostics I was able to run:
1) The motherboard sees the battery (the button lights up white if it is connected and red if it is not, as if it is almost discharged).
2) The charging LED is also on if the battery and power supply are connected (without the battery it just flashes quickly and goes out...04-04-2024, 05:23 PM -
Hi I have a touch screen monitor. It work fine for many years, but now It shows its age!
When I turn on the monitor, white lines appear on the display. They jump for a few seconds and then the display goes off.
Can you give me some pointers on where to start with the diagnostics.
There was a trail of dried light brown liquid on the board that the display connects to, as if a capacitor had leaked, but I couldn't find one. I cleaned the circuit board and resoldered the legs where this liquid was, but to no avail....Today, 03:52 PM -
Does anyone have a 2twtt$ja bios. it's 1mb plsYesterday, 07:20 PM
-
Hello BadCaps Forum! I'm new to the group and hope you guys can help me with something. I have a 2017 Apple imac A1419 board # 820-00609-A that i'm trying to identify a capacitor failure on. The capacitor is a tantalum 68 C79. See pic attached. I've tried to figure this out using the web and unfortunately can't find the information. Can someone tell me what the Capacitance value, voltage, etc is for these 68 C79 caps are? Where could i pick up a replacement? Thanks in advance!!...Today, 04:00 PM
-
As the title says. For programming with [B]CH341a MiniProgrammer[/B]
Thanks all!As the title says. For programming with [B]CH341a MiniProgrammer[/B]
Thanks all!As the title says. For programming with [B]CH341a MiniProgrammer[/B]
Thanks all!Today, 03:17 PM -
Hi All
Been a while since I have been here, and a bit rusty.
I have the above laptop motherboard that was working and now the charging circuit is faulty.
Have 19v in fine until it hits PU4403 - not shorts I can see and thermal cam reveals nothing.
I have swapped out the ISL9538 and also the two mosfets (PU4403 and PU4405). Have 2.8v at the power switch, which pulls low when pressed - charging light comes on and goes straight off
Below are measurements (pin names are per the datasheet for the ISL95338 (couldn't find one for ISL9538,...Today, 03:25 AM -
Samsung UE55JU6800K with no image on screen.
I have had this TV many years without fault, however aprox 6 months ago I fitted a new set of backlights as some of the lens caps had fallen off.
Was working fine, until 3 days ago, when watching TV the screen just went blank (still illuminated)
I turned the TV off and left it around 12 hours, and when turned it on again it seemed to work perfectly again. After around 45 mins the screen went blank again.
Left it off overnight and turned it on, and the Smart TV logo came on as normal, then screen went blank.
...Today, 10:42 AM -
Hi there,
I have a Mac on the bench that wouldn't turn on, it didn't have PPBUS_G3H voltage.
I replaced the IC U7000, ISL6259 and the green light came on, the cooler turned on and showed the video, but I noticed that PPBUS_G3H is at 9.45V and the U7000 is heating up a lot.
I took resistance measurements for the earth and did not find a short circuit.
I measured the resistors connected to the U7000 and found no different value.
I searched the Forum and didn't find anything like this.
Can anyone give me any advice about this problem?
Thanks in advance.Today, 02:00 PM -
I've had this [URL="https://www.panasonic.com/global/energy/products/eneloop/en/lineup/charger-bq-cc63.html"]Eneloop charger [/URL]from new, and it works fine but has always made a really irritating ticking sound roughly once per second when more than one battery was inserted. I found the noise to be coming from the OB5222AG PWM DIP-8 IC. I tried replacing it with an identical part - the problem persists but rather than a ticking, it now sounds like a squeal. The problem is there are no spec sheets for this IC [I]anywhere[/I] and no information besides it being a PWM IC, so I have no...Today, 10:08 AM
-
Hi All
Been a while since I have been here, and a bit rusty.
I have the above laptop motherboard that was working and now the charging circuit is faulty.
Have 19v in fine until it hits PU4403 - not shorts I can see and thermal cam reveals nothing.
I have swapped out the ISL9538 and also the two mosfets (PU4403 and PU4405). Have 2.8v at the power switch, which pulls low when pressed - charging light comes on and goes straight off
Below are measurements (pin names are per the datasheet for the ISL95338 (couldn't find one for ISL9538,...Today, 03:25 AM -
Hi there,
I have a Mac on the bench that wouldn't turn on, it didn't have PPBUS_G3H voltage.
I replaced the IC U7000, ISL6259 and the green light came on, the cooler turned on and showed the video, but I noticed that PPBUS_G3H is at 9.45V and the U7000 is heating up a lot.
I took resistance measurements for the earth and did not find a short circuit.
I measured the resistors connected to the U7000 and found no different value.
I searched the Forum and didn't find anything like this.
Can anyone give me any advice about this problem?
Thanks in advance.Today, 02:00 PM -
Samsung UE55JU6800K with no image on screen.
I have had this TV many years without fault, however aprox 6 months ago I fitted a new set of backlights as some of the lens caps had fallen off.
Was working fine, until 3 days ago, when watching TV the screen just went blank (still illuminated)
I turned the TV off and left it around 12 hours, and when turned it on again it seemed to work perfectly again. After around 45 mins the screen went blank again.
Left it off overnight and turned it on, and the Smart TV logo came on as normal, then screen went blank.
...Today, 10:42 AM -
Hi I have a touch screen monitor. It work fine for many years, but now It shows its age!
When I turn on the monitor, white lines appear on the display. They jump for a few seconds and then the display goes off.
Can you give me some pointers on where to start with the diagnostics.
There was a trail of dried light brown liquid on the board that the display connects to, as if a capacitor had leaked, but I couldn't find one. I cleaned the circuit board and resoldered the legs where this liquid was, but to no avail....Today, 03:52 PM -
As the title says. For programming with [B]CH341a MiniProgrammer[/B]
Thanks all!As the title says. For programming with [B]CH341a MiniProgrammer[/B]
Thanks all!As the title says. For programming with [B]CH341a MiniProgrammer[/B]
Thanks all!Today, 03:17 PM -
Good morning
I am encountering a problem on an Asus X421EA card which no longer starts; I checked the voltages, the 5v and 3vd are missing, has anyone encountered this problem, I have been looking for several hours without finding the source of the problem. Thank you!Today, 02:27 AM -
I have tried different ways to do it myself but failing
Its a Elite DragonFly
SN: 5CG1120KDW
Product number
6FW22AV
Any help would be appreciated...Today, 09:22 AM -
I've had this [URL="https://www.panasonic.com/global/energy/products/eneloop/en/lineup/charger-bq-cc63.html"]Eneloop charger [/URL]from new, and it works fine but has always made a really irritating ticking sound roughly once per second when more than one battery was inserted. I found the noise to be coming from the OB5222AG PWM DIP-8 IC. I tried replacing it with an identical part - the problem persists but rather than a ticking, it now sounds like a squeal. The problem is there are no spec sheets for this IC [I]anywhere[/I] and no information besides it being a PWM IC, so I have no...Today, 10:08 AM
-
Hi,
[B]820-02382 [/B](MacBook A2485 16" M1) not detecting battery. Battery sign has cross. However it works from battery but not charging and reporting incorrect data like charge remaining.
Any one any ideas please? Also fans are high/full speed
Hi,
[B]820-02382 [/B](MacBook A2485 16" M1) not detecting battery. Battery sign has cross. However it works from battery but not charging and reporting incorrect data like charge remaining.
Any one any ideas please? Also fans are high/full speed
Hi,
[B]820-02382 [/B](MacBook A2485 16"Today, 07:16 AM -
Hello BadCaps Forum! I'm new to the group and hope you guys can help me with something. I have a 2017 Apple imac A1419 board # 820-00609-A that i'm trying to identify a capacitor failure on. The capacitor is a tantalum 68 C79. See pic attached. I've tried to figure this out using the web and unfortunately can't find the information. Can someone tell me what the Capacitance value, voltage, etc is for these 68 C79 caps are? Where could i pick up a replacement? Thanks in advance!!...Today, 04:00 PM