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  1. mikey5791

    Need help repair Sunshine ATX psu

    Hi, Today I desoldered heatsink 2 and all the attached schottky rectifier so I can test any suspect part off circuit. Looking at left side part from front label MOSPEC S10C40C, I designate left pin as A1,middle pin as C,right pin as A2 and set my DMM to diode test. Red probe + to A1 & black...
  2. mikey5791

    Need Help Repairing Bicycle LED Lights

    From your picture (small_incomplete1), I can see the outer track is for negative(-) DC polarity while the inside track (near the white circle) is for positive(+) DC polarity. But I wonder if you know the battery DC voltage needed for the LED light since it is not shown in your picture. Should...
  3. mikey5791

    Need Help Repairing Bicycle LED Lights

    Hi Johnson, Can you use "Upload a File" tab to upload your pictures; showing both front and back side. I believe these bicycle lights are not faulty since you said you the light works when you pressed on lightly and you just want to change the switch on function.(maybe modify the switch...
  4. mikey5791

    Need help repair Sunshine ATX psu

    Steve, Are you saying the readings are normal because my noob understanding is the C-5027 trans is open. My intention is to change a new trans or something near its equivalent. Please correct me if I am wrong. BTW, kindly guide me on which "tree" to bark as I am stumped at the moment.
  5. mikey5791

    Need help repair Sunshine ATX psu

    Took out the suspect C-5027 transistor off board and set my DMM to diode setting. By looking at front side of trans(facing label C-5027),left pin is Base(B),middle pin is Collector(C) and right pin is Emitter(E) and using red probe as "+" and black probe as "-" I got the following six readings...
  6. mikey5791

    Need help repair Sunshine ATX psu

    Oops,sorry my mistake. If it is open circuit, meaning no current can flow through. Is it still neccesary to change it for the psu to work ?
  7. mikey5791

    Need help repair Sunshine ATX psu

    Hi, This morning I decided to recheck transistor on heat sink 1 by setting my DMM to diode test. The transistor label is SEC-C5027 which is a NPN Silicon Transistor Main High Voltage Chopper Trans.(a 800V 3A collector current type). Looking at front side of trans,left pin is Base(B),middle pin...
  8. mikey5791

    Need help repair Sunshine ATX psu

    Hi Steve, 1. Sorry I do not have a circuit diagram for this psu. 2. How do I check if there is overvoltage? I have try to connect an old harddisk and use it as a load, but the psu is still not on. 3. I have tried the jumper method of green wire ps-on to black ground wire on other psu and it...
  9. mikey5791

    Need help repair Sunshine ATX psu

    Is anyone still reading this thread? As far as I know I have checked almost every part that is a suspect, but the result says it is "good"- as in within normal reading. Kindly welcome any comment and advice. Thank you in advance.
  10. mikey5791

    Need help repair Sunshine ATX psu

    Since the 5V is from probing purple and black wire at output, my guess is it is a standby 5V line. Do correct me if I am wrong. How do I enable this power supply? Is it by switching on mains and disable the paper clip shorting the ps-on green wire and ground black wire at the 20 pins Molex main...
  11. mikey5791

    Need help repair Sunshine ATX psu

    Hi, Got this el cheapo China made ATX psu Sunshine Model NS235W from a garage sale. The owner does not know the psu condition. When I got home, since there is no sign of burn marks and fuse tested with continuity, I plugged in to mains, I replaced the fuse by a 60w light bulb and shorted the...
  12. mikey5791

    My baby girl wet my laptop. I want to learn how to fix it.

    Hi Alex, What is the name and model of your laptop? Try NOT to power on the laptop as there might be some leftover moisture that may act as conductor and short circuit other components. Then you end up with more damage parts. First thing is to remove your laptop battery. Then get a guide...
  13. mikey5791

    LG Flatron L1942T-PF monitor no power

    Sir 73's de Edd, It seems like the IC at U101 being LAF0001 needs a replacement; which is not easy to get at our part of the country. I have checked the local store but they do not have it. So i checked online at utsource.net, the cost for 1 piece is USD 1.00 but shipping is USD 20.00; this is...
  14. mikey5791

    JBL Home subwoofer ES150P/230 buzz noise

    Hi, The ferrite core is a magnetic core for voltage regulation, have you test it for conductivity/ continuity? If it still conducts, then likely is still usable. You need to replace if it doesn't show continuity on DMM. If you think it is cost effective to change full PCB, it is really up to...
  15. mikey5791

    JBL Home subwoofer ES150P/230 buzz noise

    Hi aimen06, c26 is at right side of your picture No.3 (3.jpg), the brown circular/round one covered by white glue on the bottom part. it is near the resistor. Have you check the 3 digit code? I guess the board manufacturer normally put glue during production to kind of stabilise the part from...
  16. mikey5791

    JBL Home subwoofer ES150P/230 buzz noise

    Hi aimen06, You need to use a sharp blade to carefully scrap off the yellowish glue as those glue can become hardened and conductive. Take your time and try not to scrap the copper coating. Then you can see at C16 & C17 is capacitor 10uF 100V (20% RoHS), while in between is a Ferrite Core...
  17. mikey5791

    LG Flatron L1942T-PF monitor no power

    Sir 73's de Edd, Out of suspicion, i measured resistance of those tiny smd resistor at the back side of power board and noticed three resistors worth further checking. Setting my DMM to 200 ohm scale, I got the two following readings (the resistor marking in bracket): R122(4R7)= 80.8 ohm (4R7...
  18. mikey5791

    LG Flatron L1942T-PF monitor no power

    Sir 73's de Edd, Done resistance measurement on IC LAF0001 by setting my DMM to 200 ohm scale. Recheck and probe on pin 7 vcc & pin 5 Grd= 64.8 ohm (may I know why is it bad ?) Pin 6 out to pin 7 vcc= 104.6 ohm Pin 6 out to pin 5 Grd = 49.9 ohm All the above are done while the IC is still on...
  19. mikey5791

    LG Flatron L1942T-PF monitor no power

    Hi Sir 73 de Edd, Done the dc voltage test, resistor R117 is smd 244 reads 220k, R118 smd 244 also reads 220k. Reisitor R107 reads 840k and still keeps increasing while i measure it on board. Resistor R108 reads 45.9k I also measure the ic LAF0001 pin 7 & pin 5 ground, dmm reads 64.8 ohm...
  20. mikey5791

    LG Flatron L1942T-PF monitor no power

    Hi, Done a DC voltage test by red probe to each of the pins on U101 (PWM controller LAF0001) while black probe to ground screw pad on right side of the board. On pin 1 (with a circle denote pin1),which is Vstr the DMM reads 74vDC then slowly drops to zero. On pin 5 Grd,the DMM reads -112vDC, i...
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