Search results

  1. mikey5791

    Discharging a capacitor to safely work on a camera

    Hi Riley, My advice on discharging the capacitor(cap) is to be extra careful as the cap still able to store quite a huge amount of electric shock. Step 1:To discharge safely you need to get a 5W or 10W 5K to 10K ohm ceramic resistor (likely it is a square type) connect one end to one lead...
  2. mikey5791

    Need help diagnose Acer LCD monitor

    Hi Steve, Thanks for the prompt reply. I managed to find some free time on weekend to open up the Acer monitor by sliding a few plastic ruler on four sides after prying carefully with a thin screwdriver. This really tested my patience as I do not want to create any major markings. Then, I...
  3. mikey5791

    Need help diagnose Acer LCD monitor

    Hi, Recently found from storage a 17" Acer LCD monitor which I remembered was kept as spare. The model is AL1717 and I try to connect this monitor to a working CPU. Upon switching the monitor power button, the monitor display yellow standby light. Then after switching on the CPU power, the...
  4. mikey5791

    Need help to clean LCD screen

    Hi DLD, Following your advice, I use LCD Screen cleaning kit on cotton swab and wipe on the display to clean off mold and fungi. After waited for abt 5 min to dry, power on and the LCD screen much clearer now. Thanks for the help.
  5. mikey5791

    Need help to repair computer power supply

    Hi Steve, Finally I received reply from a supplier (utsource.net) , they are charging transistor F946 E13007-2 or MJE13007 at USD 2 per piece at a reasonable price but they do not have stock for part number (F51 J13007-2 or PJ13007, and -M); and thus I may not able to try on the repair job...
  6. mikey5791

    What kind of rechargeable cell do I replace this with?

    Hi NuLED, You may check this site http://dx.com/p/ipower-2400mah-intelligent-fully-automatic-secondary-battery-speaker-for-iphone-3g-16083 Since it is sold out, suggest you add to wish list or contact the supplier. Normally it is advisable to replace the faulty swollen battery pack with...
  7. mikey5791

    Need help to clean LCD screen

    Hi, Recently I dug out from store a mini game console (size 4" X 4") build by Epoch Co.Ltd, Japan, the model is a late 1980's type running on DC 3V using 2AA size battery. The LCD screen still works but the external display covered by a thin layer of oil like substance while looking at...
  8. mikey5791

    Need help to repair computer power supply

    Hi Steve, Thanks for the clear explanation on getting the faulty components off heatsink. As for supplier, I've inquired futurlec (http://futurlec.com), but the sales manager replied they are not familiar with the part number I supplied (F51 J13007-2 or PJ13007, and F946 E13007-2 or...
  9. mikey5791

    Samsung TV buzzing noise

    Hi, The buzzing noise could be from those failing / about to fail capacitor . To check the noise source, turn on your tv, then roll up a thin cardboard to a straw like shape about 6 inch long and 1 inch diameter. Glue or tape your end fold to hold it in place. Use this like a "doctor...
  10. mikey5791

    Need help to repair computer power supply

    Hi Steve, From your help and doing all the testing, it is more or less known the faulty component which are along heat sink 1, namely F51 J13007-2 same as PJ13007, and F946 E13007-2 same as MJE13007-M as well as all the four diodes show part No. as RL 207 HG ( i will change all 4 diodes)...
  11. mikey5791

    Need help to repair computer power supply

    Hi Steve, This morning (Saturday 23 Nov 2013), I desolder one leg of the diodes (position on board as BD2,BD1,BD4 & BD3) refer photo of img 0155 on diode BD2 as nearest to thermistor SCK053. Then by setting the digital meter to diode test I got the following readings: On diode position...
  12. mikey5791

    Need help to repair computer power supply

    Hi Steve, Sorry, earlier on the reading was taken from setting digital meter to ohm reading. My apology to misled as I agree due to my inexperience and I am willing to learn more. On my digital meter diode setting, I am taking the component reading from left to right (like pin 1,2,3) and...
  13. mikey5791

    Need help to repair computer power supply

    Hi Steve, As your advice, I use multimeter measure resistance both ways to check for low resistance under 100ohms and put my probe on the track side as the component side is a bit cramped. The measurement I got from transistor on left heatsink (label 1) is between 2 to 50 ohms as well as...
  14. mikey5791

    Need help to repair computer power supply

    Hi, My desktop pc Pentium 4 power supply recently flashed a bright spark and some smoke upon pressing switch on the pc; then the pc not able to turn on. After unplug the wall power cable, I tried open the power supply case (G-TECH SFX-500) and noticed the thermistor NTC 5D-9 is blown and...
  15. mikey5791

    Need help to fix motion detector alarm

    Hi KrisBlueNZ, Sorry for late reply as I got occupied with some other chores and also waiting for my order of electrolytic capacitor which arrived last week. From your advice I unsoldered the two electrolytic caps nearest to the sensor namely C1(100uF 16V) & C2( 2.2uF 50V) and measure...
  16. mikey5791

    External battery configuration for laptop...

    External battery configuration for laptop Hi blixt139, By connecting two 12V small car type batteries (say 12V 7Ah capacity) wired in series will get you total 24V at 7Ah same capacity rating. You need to be careful as the total voltage now is at 24V which is slightly higher than your laptop...
  17. mikey5791

    Need help to build police siren/LED flasher

    Hi, I took advice of trimming the leads, then resolder those joints not properly done to make sure the solder cover the pad fully in cone shape. Also change transistor Q3 (C1815) and replace a new one from my stock. Then, I plug in battery and switch on, the LED lights flash (refer photo)...
  18. mikey5791

    Need help to fix motion detector alarm

    Hi KrisBlueNZ, As suggested earlier, I fixed on a 9v battery & turn the alarm on which the LED lights up, wait for the LED to go out, and waited like 30 seconds but the LED doesn't go off . Then I try connecting the two clips together, using a pair of pliers but still no alarm sound (the...
  19. mikey5791

    Need help to build police siren/LED flasher

    Dear all, Last night out of curiousity and managed to find time using a multimeter diode function to test capacitor C1815 label as TR1(Q1), TR2(Q2) & TR3(Q3). I connected multimeter negative black probe(-) to one lead label as 1(refer paint picture "capHA026), then positive red probe(+) to...
  20. mikey5791

    Need help to fix motion detector alarm

    Hi, Last night I managed to test the alarm and plug in 9V battery and the LED lights up. Confirm there is power from battery to LED since I use a multimeter to check on the track. I shake the motion detector to activate the alarm but still no sound from buzzer. Attached some extra photos...
Top