this unit was no power stuck at 5v .. i check PP3V3_G3H shorted line i replace q7680 and short gone.. i have 20v now and 0.1amp - 0.9amp.. what should i check next? still no chime sound no fan spin
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Last edited by alfredposadas09; 08-26-2024, 10:01 PM. -
Check the voltage to ground of PPBUS_G3H @ F7000. Check both sides of the fuse. If this voltage is not 12-13v then remove all power. Meter in resistance mode. Measure the resistance to ground of F7000 fuse. If there is a low resistance, flux and remove F7000 fuse. Power up again to confirm if the ISL9240 side of the fuse pad (removed fuse) is able to create a stable voltage for PPBUS_G3H. -
The missing rail does not appear to be shorted but confirm it in resistance mode as well. Remove all power. Meter in resistance mode. Measure the resistance to ground of PV5G3S_VSW.
Confirm that this rail is being enabled by checking the voltage to ground of P5VG3S_EN_DLY.
Also check
P5VG3S_EN @ R7613.
SMBUS_3V3_BATT_SCL
SMBUS_3V3_BATT_SDAComment
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L8102= 0.043 diode reading/88.2ohms
I do CPU coil measuring this line i have these values... Based on Flexbv the correct value is 0.124 but I am only getting 0.043. U8110 generated the PP0V95_S0_CPUVCCIO_REG_R and its vin supply is PP5V_G3S_CPUREG_MISC.. maybe I got a bad CPU? What do you think? do I jump on basics?Last edited by alfredposadas09; 08-27-2024, 08:07 AM.Comment
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Need the voltage to ground for the following (not diode mode measurements):
P5VG3S_EN @ R7613.
SMBUS_3V3_BATT_SCL
SMBUS_3V3_BATT_SDA
The CPU diode measurement looks low but the resistance to ground is ok. Wait on other comments but post the requested voltage measurements (not diode) of the above.Comment
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P5VG3S_EN @ R7613. = 0v
SMBUS_3V3_BATT_SCL = 3.3v
SMBUS_3V3_BATT_SDA = 3.3v
i lift L8102 on pad 1 i measure 0.4v diode , on pad2 cpu side i still measure 0.004.. i still dont have 5vg3s_en @r7613 the diode reading in this line is 0.4v...Comment
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is it possible to replace cpu in MacBooks?Comment
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Is your DFU setup known good? The USB cable is of quality? We use 100W rated TBT rated cables, to be safe.
What is the voltage to ground of ALL_SYS_PWRGD?
Last edited by mon2; 09-04-2024, 06:41 AM.Comment
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Hello, I disassembled this dead camera, and found this WTF… Two fuses soldered one above the other !
I was pretty sure nobody touched it before, but that can't be from factory. There is flux, and capacitor is probably missing.
The other weird thing : the fuses are « G » fuse : (0.75A – 8V), seems very low. The original fuse should be « O » : (32V 2,5A).
There is « O » mark beside. All fuses have the same mark letter on main board. So, I can deduce it's a « O » fuse.
And this correspond to the issus I saw : when I plug the battery, I measure the voltage dropping... -
Hi I wonder if anyone might be able to steer me in the right direction. I have this Samsung UE46ES8000 TV and it went bang during use. The main fuse on the PSU board is open. I've checked every diode/mosfet/transistor I can see and nothing appears to be short to cause the fuse to go. The DC output of the bridge rectifier is not short either. I've seen online that some of these models are known for having their PFC mosfet or other mosfets shorting and blowing the fuse but i'm not seeing that here. If anyone aware of these models having any issues to cause this? I'm reluctant to just replace the... -
Hi guys,
I'm inexperienced with electronics repairs, I've done a little bit of soldering caps and whatnot, but i have a blown fuse on this mimaki printer I got which I have bought a replacement for.
How do I remove this type of fuse (see picture)...it kinda looks like it would pull out of that bracket but it didn't come at first pull and I didn't want to brute force it incase it's soldered on there like most of the rest of the components.
Anybody know how to remove this type of fuse?
(The fuse is toward the bottom of the image labeled F2)... -
I found a project in the electronics trash yesterday. A nice Argon SA1 audio amp with some electrical issue. Took it apart and saw that the 4A250V fuse was blown so started lifting components to find the short. Eventually got to two MOSFETs (model FTA14N50C) that are shorted and when i took them out the short was gone.
Now i didn't have any replacements of the same model of course but i found a couple with pretty similar spec i thought (K10A60D & K12A50D) and put them in. Also replaced the blown fuse with a 3.5A250V one. Checked another time for short circuit and plugged it in.... -
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