Re: Blown cap on old dwell gauge - kal equip 2851
You're right trace should be flat but I have seen that as a solder blob from the tinning process, on PC boards made in the 1980's like this one.
The dwell meter reminds me of Sun, Sears Craftsman etc. circuits. PCB marked 01-4221B so it might be made by them.
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Re: Blown cap on old dwell gauge - kal equip 2851
that transistor looking thing might be shorted ..best check its id number then test it .Leave a comment:
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Re: Blown cap on old dwell gauge - kal equip 2851
here doesn't look right ..Attached FilesLeave a comment:
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Re: Blown cap on old dwell gauge - kal equip 2851
I followed the circuit a bit, but can't tell what all the wires go to. The burnt resistor connects to the red wire near the LED, see pic.
I would say it's 82R based on the grey band and smoke, so power shorted to that wire. It's a weird fault, someone must have connected up the wires wrong to the board. +12V power is supposed to connect to the top right corner. The CD4069 IC then gets 9VDC power.
OP a resistor does not burn up unless there is an overload caused by another issue. So replacing the resistor will just smoke it again. The other resistor looks OK it just has a purple body. I can't see any cooked pcb traces, it's just solder-dipped might appear that way?
The transistor typically connects to the ignition coil/points, but here it's missing all the surge protection parts so I'm not sure where they are.Attached FilesLeave a comment:
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Re: Blown cap on old dwell gauge - kal equip 2851
looks like a track got burned through .Leave a comment:
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Re: Blown cap on old dwell gauge - kal equip 2851
desolder it and check its resistanceLeave a comment:
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Re: Blown cap on old dwell gauge - kal equip 2851
Thanks both for the quick replies. Sorry I couldn't respond until now.
Attached are pics of the trace side and (I hope) a clearer pic of the numbers of nearby components.
I believe it connects:
The very purple resistor (?) to the left of it
The black three post component (not sure what it's called)
Two white 'blocks': .1J100# and (horn?)33nJ250 (obviously not so sure on the symbols)Attached FilesLeave a comment:
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Re: Blown cap on old dwell gauge - kal equip 2851
looks more like a resistor to me ..what does it connect to ?Leave a comment:
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Blown cap on old dwell gauge - kal equip 2851
Hi,
Can anyone help ID this cap, or any tips on how to figure it out? As you can see, it's clearly fried. Unfortunately the burn marks obscured the color bands. I couldn't get a good zoom on it with my phone, so I hope the pics are enough. I can try again if not.Attached Files -
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I'm new to this forum. So my trusty 17-year-old LG 47" LCD recently died. As I was booting it up, I heard a hum followed by a loud bang, sounds of pieces flying around, and loss of power to the unit. Inspecting the PSU, I saw two obvious problems: a blown thermistor (bang + flung pieces) and a visibly bulging main cap. Inspecting as many components as I could with my Fluke MM, I diagnosed that the following components on the "hot side" of the board were also bad: one of the 2 main MOSFETs, main 8A fuse, small cap (25V 47uF) connected to main caps, and a blown... -
HP Modelnumber: 14-dh0061nb​
This laptop had a shorted cap on a Vcore section. After replacement is works again. But there is still a battery issue.
The battery is HT03XL and with the built-in component test from HP, in the Power section, I get an error: Logic State: Calibration required (20), Charge state: Blown Fuse (42)
I have another same battery, also with error: Logic State: Very Weak (70), Charge state: Blown Fuse (42)
And a third battery TF03XL (looks identical) with error: Logic State: OK (0), Charge state: Blown Fuse (42)
All these 3 batteries are charging... -
Hey everyone,
I'm a novice trying to repair my laptop. The LCD screen has an image, but no LED backlight for the image. It also produces an image when connected to an external monitor.
I have found what I believe to be a blown inductor labeled "L4502" and "120 Ohm" in the schematics (zoomed in image, blue arrow to blown component). I have included an image of the general area of the mobo and an excerpt from the schematics as well.
I am having trouble selecting a replacement component, which I believe to be a 120 Ohm ferrite bead, from the components... -
Hey everyone,
I just went ahead and unscrewed a faulty GTX 980 TI from Gigabyte. What I found beneath the cooler was, as it seems, a common issue of that card. Two blown fuses on the bottom right corner of the card next to a MOSFET.
Now my question would be if there is any schematics of that card available to figure out which are the blown components so I can try and replace them together with the mosfet if needed.
Find some pictures of the actual GPU together with a picture of how it should look like.
I also wonder whther it might be a problem that there... -
This Samsung combined power supply and inverter was replaced a while ago from a Samsung 37inch LE37B530P7W TV. However I would like to repair this one.
I have replaced the Mosfets Q1820 and Q1821 ( FDPF7N50U) which were both blown and the fuse FM802S. The schematic for this power supply that is attached doesn't relate to this power supply as the driving transistors and diodes are D1830, D1831, D1832, D1833, Q1811 & Q1810 are nowhere on the schematic!
Does anyone know what the components for D1830, D1831, D1832, D1833, Q1811 & Q1810 should be? I ask as I did change the Mosfets...
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