Hello, I was wondering if anyone had a failed capacitor on the output of the inverter transformer? My transformer gets way too hot even with other tubes which I know work fine and the capacitors are connected in parallel to the transformer output. If anyone has experience on this please reply.
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Re: High voltage inverter capacitors
You are talking about the Ceramic ballast cap, the small high Voltage blue cap rated around 3K ~ 5KV?
They do fail and will show leakage resistance or just shorted out, it will be hard to test using simple Ohm meter because the working Voltage the caps is exposed to is from 500 ~ 2KV or more.
You have to inverter transformers, correct? If that is the cased you can then just swap the caps over and see if the problem will follow.Never stop learning
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Voltage Regulator (LDO) testing:
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Inverter testing using old CFL:
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Re: High voltage inverter capacitors
I have one transformer for both CCFL tubes. And yes i'm talking about those blue 3pf 6kv capacitors. I measured it using an lcr meter but the resistance Is around 3 M ohm. My transformer is heating up even with working tubes on the output so it must be something in between.
I am also studying the schematic of the inverter circuit but the only things that could fail to make it this hot are two SMD ceramic 4,7uF/25 volt caps.Comment
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Re: High voltage inverter capacitors
If you have low value capacitors on this board it probably would not hurt to replace themComment
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Hi Folks
I'm looking for a extreme high current short killer solution for a reasonable cost.
I have an LGA1700 motherboard (ASUS PRIME Z790-P WiFi) where I exchanged the LGA socket already 3 times, and every time after the socket exchange I get a short of power supply lines VCORE (V variable) and VCCIN_AUX (1.8V).
After taking off the socket, the shorts dissappear again.
The soldermask on the socket is already partially demaged from the heat, so I have reconstructed the soldermask by manually painting the missing soldermask parts with a very small top of a...10-15-2024, 10:13 AM -
Hello, I have a SYMSI70 gas heater board, which has issues with its primary side power supply, controlled by TOP247Y chip.
When I replace a TOP247Y it explode in 1 second. I have desoldered transformer and measured a winding ratio, so transformer looks like OK.
Transformer:
|Info| Primary | Aux | AB | CD|
|-|----------|----------|-|-|
|Ratio|1|25|40|12|
|Voltage AC|230V|9.2V|5.8V|19V|
|Voltage DC (*1.41)|230V|13V|8.1V|27V|
I have disabled a undervoltage protection of TOP247Y, disconnected secondaries and tried to power it up... -
Hello,
I need help to find the value of 2 missing capacitors ( C102 and C117) on my Easun SMH-II mainboard (solar hybrid inverter). I circled it in red on the close-up picture. The 2 old capacitors are completely missing, so I have no reference. Does anyone have this board and can tell me the value or make an educated guess based on the location ?
My model is : EASUN SMH-II 7 KW
Mother Board : P/N 18947-002401250250
Maybe the EASUN SMH-II 4.2 KW have the same capacitors
Thank you... -
I found two capacitors on the board and one of the leads on one capacitor had bad soldering joint and the other joint connections not much better and there were several soldering joints that way to much flux around the joint redid several of them
The capacitors were a non brand that I did not recognize they got replaced and now it does not oscillating between relay but what concerns me a little bit is when the voltage is a little bit low the output voltage is around 130 volts and then drops down to 115 volts this happens around 105 to 108 volts if remember correctly
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Hello, people.
i am not sure if this question belongs to this forum section exactly, but since there already are some queries here about power transformer, let's give it a try.
So, I have this old but very well preserved Casio SA-20 ToneBank keyboard. It is powered either by five 1.5V AA bateries, or via a power adapter, so its operating voltage is 7.5V. The power adapter input jack also states 7.5V DC In. Now, since this keyboard was never supplied with a PT, but actually came with test bateries included, I decided to try to buy an adapter for it. I know I could have just gone...
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