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  1. mikey5791

    LG Flatron L1942T-PF monitor no power

    Sir 73's de Edd, Indeed you have typed my name before and advise on few of my earlier repairs. Your detailed explanations on the circuit workings helped a lot on further understanding of this monitor power board which I will need time to absorb. To answer on C207(22vDC supply and C205 as 5vDC...
  2. mikey5791

    LG Flatron L1942T-PF monitor no power

    HellasTechn, It is unlikely to confirm if the ccfl lamps are not bad as I do not have a known good inverter to do the testing. Referring to your comment on "I would also replace the components in red circle with new and check u201." In fact,one of the red circle item at Q101(on heat sink) is a...
  3. mikey5791

    LG Flatron L1942T-PF monitor no power

    One More photo of inverter transformer on power board LG Flatron L1942T-PF.
  4. mikey5791

    LG Flatron L1942T-PF monitor no power

    Hi all, Got this LG Flatron L1942T-PF LCD monitor free from a friend but the problem is it does not have display power (power board model LGP-002L) and lacks a main transistor at Q101. After searching thru service manual, I installed a mosfet SSS7N60B at Q101, replaced all the secondary filter...
  5. mikey5791

    Need help diagnose Samsung Syncmaster 153V monitor

    A friend sent me this old Samsung Syncmaster 153V LCD monitor to repair. The problem is power board no power, completely dead no light whatsoever. the power switch led no light during testing or after switched on main. I had some basic skills in repairing dead monitor with a soldering...
  6. mikey5791

    Anyone know this fuse rating

    Hi KTW, Are you saying to measure continuity between red and black leads to the fan in order to check the motor is in working condition. Since the red and black leads are soldered to the board, this mean I have to desolder both the two leads out of board circuit ? Hi Davenn, Noted your...
  7. mikey5791

    Anyone know this fuse rating

    Hi, Changed the motor thermal fuse to a 10A 144C (image 1569)as I am unable to get a 2A 135C type, then I power on fan, but sadly the fan motor still not spinning. Tested other component, there seems to be no burning mark or short anywhere, main fuse is still ok, not shorted. The panel itself...
  8. mikey5791

    Anyone know this fuse rating

    Hi KTW, Great tip there.(haha I didn't think of this) Removed the heat shrink and inside is a radial shape K series marking "SET K5 135C M03 GP" . Refer to this site http://www.setfuse.com/product/over-temperature-protection/thermal-cutofftco/radial-shape/k-series.html it is a 2A 250AC thermal...
  9. mikey5791

    Anyone know this fuse rating

    Hi to all, Recently I came across to repair a stalled Pensonic brand tower fan Model:PTW-201RI. The fault seem to be inside the motor label as YSY series Fan motor (input 60W, insulate grade 120,Frequency 50Hz,speed 1050+-80r/min). I also noticed a paper sticker outside the fan motor as"...
  10. mikey5791

    AC Adapter model AA-091AD not working

    Haha my silly mistake is thinking this unit is a DC adapter. After I set my DMM to AC mode and got reading about 11vac, then I realised my noob mistake of not reading the unit label (AC adaptor). Thank you for pointing me to the right direction.
  11. mikey5791

    AC Adapter model AA-091AD not working

    Hi, I recently dug out this non working OEM AC adapter (input 230V), it was meant to supply output 9V DC for a modem (already sold without the adapter). Tested on the output side with a Digital multimeter but zero power. Then I pry open to check for fault inside the case. Nothing seem burn...
  12. mikey5791

    Need help repair dead switching power supply

    Sir 73's de Edd, Appreciate your great effort to do the explanation in a comprehensive manner. The info will come in handy to those who are eager to learn more on diagnosing dead non working PSU. With the common generic 2A05 diode replacing the original shorted SB240, I am doing an initial...
  13. mikey5791

    Need help repair dead switching power supply

    Sir 73's de Edd, Your explanation on the lag response is understandable as you are also taking time to do several assists. I appreciate your detailed writing on the theory side of diode. However, I am not able to do the DC voltage test as you suggested as I had thrown out the "roasted" SB240...
  14. mikey5791

    Need help repair dead switching power supply

    Hi Alec_t, On carrying out the diode test on NEC2501 (opto isolator) two lower pins,I put black probe on pin 1 while red probe on pin 2 got reading 1(over limit). Then i swapped the probes and got reading 704. This I believe is a good component. One question though. Do I need to test on the...
  15. mikey5791

    Need help repair dead switching power supply

    Hi Alec_t, Checked the lower two pins of the NEC2501 (opto-isolator) indeed is blackened. How do I check if there's a dead diode between pin 1 & 2? Which part is anode and which part is cathode ? Sorry my knowledge on this is limited. Thanking in advance for the steps. Hi Sir 73's de Edd...
  16. mikey5791

    Need help repair dead switching power supply

    Hi Martaine2005, Tha fios agaibh, Sir 73's de Edd, Dorke With my limited knowledge, how do I test if the 16 pin IC KA7500B (Fairchild SMPS Controller) is good? Yesterday out of curiousity, I tested two black diodes (next to a 100ohm resistor) below that small transformer "MTREE-19-1" and...
  17. mikey5791

    Need help repair dead switching power supply

    Hi Martaine2005, Tha fios agaibh, Sir 73's de Edd, Very much appreciate all your points. As suggested, I refer my earlier pic (img1006) on the two PS caps on the far right and physically inspect for slight dome. Noticed esp on caps labelled D.S.1000uF10V is a bit bulging on the bottom black...
  18. mikey5791

    Need help repair dead switching power supply

    Hi Sir 73's de Edd, Upon your recommendations, I went outside the house under strong sunlight (which we have plenty of it here) and examine the solder as you had marked with a magnifier. Also I moved/jiggled each component on the top pcb to check for loose fittings on the other side. But so far...
  19. mikey5791

    Need help repair dead switching power supply

    Hi Sir 73's de Edd, I am a bit flattered by your formal salutation but later after seeing your country icon I can understand. Thank you for your suggestions and quick reply. May I confirm with your statement saying "Get your self a BRIGT light or go outdoors for sunlight along with a...
  20. mikey5791

    Need help repair dead switching power supply

    Hi all, I got this piece of dead china made switching power supply AVF brand labelled as 350w from a friend who previouly used on an old pc. When i opened the case nothing seemed burned and no sign of bulged caps. To prevent further damage, i connect a 100 watt light bulb(our country main supply...
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