marce002
Badcaps Veteran
Last Activity: 03-16-2025, 07:13 AM
Joined: 05-30-2018
Location: Buenos Aires
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this is the shorted part. looks like mosfet.... found led drivers from burned house applianced leds , but theyare not suitable for this, they are buck led drivers 8 pins. any help will be muuuch apreciated.thksLast edited by marce002; 11-16-2024, 04:24 PM. -
Replacement for LED DIMMER chip
Hello I have a led lamp with 3 TP8005S chips. one is shorted but cant find a replace part around.
.. is it easy to replace with another option? it is just on /off led lamp for scooter... low beam and high beam are working just fine...Last edited by marce002; 11-16-2024, 04:19 PM. -
Thanks a lot T J!! it was a 320 ohm resistor close to the opto, whose value was wrong and turned out to be burned in the hidden bottom side. tks now output is 12.8V the endLeave a comment:
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hi the values from GND pin 5 with out load (blue) and with lights (green) on are:... and just in case the diode im VD1 and the other one on left V1 are: VD1= MBR20100CT and V1= HY1710Last edited by marce002; 11-11-2024, 06:13 AM.Leave a comment:
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sorry, the blob is ok, just me replacing a zener but was not shorted and the other blob on + is a wire + used with my power supply to test also ok.
i will recheck and report back Volts, because ic gnd was not my reference, used wire conecror gnd, my fault.thksLeave a comment:
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that is the first i check... it still is 19.34v with lights on and all turned on... besides the audio center and BT device does not work due to overvolt... what else to try?
note the 3 resistors 1kohm near the transformer seems to be quite hot to touch, but maybe normal...Leave a comment:
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72v to 12v 10A output is high 19.6v
hello, this is from electric moto scooter... something happened and blown an onboard fuse in the converter box..replaced it and also replaced a bulged cap 100v 100uf ... now works but get 19v in the output instead of 12V...
what else to check please!! this is the board:... -
As i stated before i have 0.249v in br/ctl... so maybe should desolder it and test if shorted ?
Now i realize that seems to be D8 shorted.Last edited by marce002; 10-17-2024, 06:23 AM.Leave a comment:
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nope, the source power is from 7550 regulator and his output to the FP5139 is exactly 5V, so the problem is in the "load side", what else can I test...? or maybe fp5139cis fried?. thks again!...Last edited by marce002; 10-16-2024, 05:20 PM.Leave a comment:
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thks ... it seems low v ..(tested with output enabled 5v 3A , display showing 0.67v 2.92A no load!!) and in 5139: 0.369v in vcc pin and 0.249v in br/ctl... will check who gives vcc to ir right?Last edited by marce002; 10-16-2024, 03:06 PM.Leave a comment:
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Changed the mosfet, and problem still there. sadLeave a comment:
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Boost ZK 4KX low output damaged?
Hi
This device is a common buck boost 0v to 30v...
It was working good now shows close to 0V output whatever Volt I set. The unit is powered from good amps 12v server power supply. I took appart and shows no phisical damage... mosfet looks fine ..what can i try? see pics:
thks in advance!!... -
5n60c as first post picturedLeave a comment:
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ok ... now on case that i would like to make 12v fixed output .. what resistor would you change?Leave a comment:
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it is 3A 42v output. i though someone would direct me to replace some resistor in some pin for a POT to make it variable output, but seems it is not so easy.Leave a comment:
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whatever can be done will be ok, thanks stj!!...
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Can you suggest me how to variable output this 42v fixed
Hello
I have this board working fine designed to 42v fixed output using lm324n chip and i really need to make adjustable output (ideal if Vol and Current with 2 pots but at least only Vol).... i was trying to do it with datasheet and several diagrams but could not
the pins 1 2 and 3 are unconnected so it is using only 3 op amps in the chip.... How do you think I can mod it?
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or any hint for an schematic similar..... -
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