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  1. mikey5791

    Help diagnose Vinnfier sub woofer no power on

    Hi, Today i do some voltage testing. Measured dcv on two large lytic caps, c32=18vdc and c31=18vdc (both caps are rated 4700uf 25v) Measured op amp 4558, i got dcv reading 32vdc by using dmm red positive on pin 8 and black negative on pin 4. Not sure if these readings are within normal range.
  2. mikey5791

    Help diagnose Vinnfier sub woofer no power on

    Hi 73's de Edd, Thanks for your reply. I checked the glass fuse F1.5AL using an analog multimeter and it has continuity and no sign of blown fuse. I am attaching the top and bottom photo of the board. Fyi, i have a digital multimeter and a 40watt soldering iron with little soldering experience...
  3. mikey5791

    Help diagnose Vinnfier sub woofer no power on

    Hi, When i switched on ac power, there is no blue led power on. So i suspect something gone bad at the power board. Not able to search any schematic. Noticed a dual op amp 8 pin 4558d jrc 0058t, i googled and found vcc is pin 8 and ground is pin 4. Another set of 5 pin mosfet tda2030Al are audio...
  4. mikey5791

    Help on Samsung Syncmaster 732N led conversion

    Bluejets and bertus, Received the led conversion kit yesterday and fitted the wiring as suggested here. Voila! It works! To be honest, I am quite satisfied with the led quality and brightness is adjustable. Hope it will continue to work for many years to come. My sincere thanks for your generous...
  5. mikey5791

    Help on Samsung Syncmaster 732N led conversion

    Fyi, i had placed order for the led conversion kit. Due to the current pandemic situation, it will arrive at my door step in 1-2 months time. After the kit installation, I will post an update on the result here. Many thanks for the kind assistance.
  6. mikey5791

    Help on Samsung Syncmaster 732N led conversion

    Bertus, So it looks like the second yellow wire should solder to pin 1( instead of pin 8 which is a fixed type dimming). Thanks for pointing out page 59 on those ip signals.
  7. mikey5791

    Help on Samsung Syncmaster 732N led conversion

    bertus, Yes, the IP board is what i wish to display. Fyi i plan to solder pin 2 to red VIN side of led driver for the 14vdc source, while pin 9 to first yellow ENA side of led driver for the on off function. The second yellow DIM of led driver should be soldered to pin 8(B dim). The black wire...
  8. mikey5791

    Help on Samsung Syncmaster 732N led conversion

    As attached page 74 downloaded from the said manual on the wiring diagram.
  9. mikey5791

    Help on Samsung Syncmaster 732N led conversion

    Found the service manual on wiring diagram LS17PEA (17 inch monitor) at page 74 on the 9 pin assignment but not sure where the yellow (enable) and another yellow (brightness adjust) connect to. The link...
  10. mikey5791

    Help on Samsung Syncmaster 732N led conversion

    Appreciate your input Bluejets. I will check on some youtube for the fitting.
  11. mikey5791

    Help on Samsung Syncmaster 732N led conversion

    Hi, Yesterday i received this lcd monitor free but the owner says the backlight doesn't work anymore. I removed the metal case and tested the main and power board on an acer lcd monitor and the lcd display comes out fine, meaning the power board and inverter still in working condition. Now my...
  12. mikey5791

    Hp 2035 monitor Check the Signal Cable

    I will agree with Steve on checking the ESR of the capacitors in the power supply. Recently I had come across my Acer monitor model AL1717 which suddenly just show black screen on and off intermittent even though I have been using it daily for the past 5 years. The bad capacitors does not even...
  13. mikey5791

    Acer Aspire 4738 laptop intermittent shut off

    Hi Bertus, It runs and boots from Hiren boot cd and i keep it running for hours. Then i use Avast to scan the hdd, resolved the issue created by Google Chrome. Maybe Google Chrome crash or conflict with my Windows 7. I uninstalled Google Chrome and use Mozilla Firefox now. Restart Windows 7...
  14. mikey5791

    Acer Aspire 4738 laptop intermittent shut off

    Hi Bertus, Yes, the laptop has a cd drive. I will try run Hiren boot cd and hope it keeps running. Wait for my report then. Thanks.
  15. mikey5791

    Acer Aspire 4738 laptop intermittent shut off

    Hi Martin, Fyi, the hdd no clicking noise. I had checked for virus. Nothing found. I had tried with a different hdd running a working Win 7 professional loan from another laptop. The Win 7 os boots properly, then i play a movie which just run about 2 minutes, then the laptop just reboots back...
  16. mikey5791

    Acer Aspire 4738 laptop intermittent shut off

    Hi, Sad to inform this morning the laptop show blue screen displaying "A problem has been detected....the system encountered an uncorrectable hardware error. Tech info stop:0X00000124" Guessed i had celebrate too early by not doing enough on further test run. I did what i did earlier by rebuild...
  17. mikey5791

    Acer Aspire 4738 laptop intermittent shut off

    Hi Martin, Back to your questions, the fan continue to spin with or without hdd. This Aspire 4738 laptop is a 64 bit os but the hdd running win xp is a 32 bit system. The system crash when i try boot using the xp hdd. Maybe due to a different bit system detected. The other day you had suggested...
  18. mikey5791

    Acer Aspire 4738 laptop intermittent shut off

    Hi Martin, As you suggested, i took out the hdd and switched on laptop. It displays " no bootable device. Insert boot disk...." It continues on more than 10 min without shut down. Later, i removed the laptop battery and run from mains. I inserted Ubuntu live cd and run it for an hour with no...
  19. mikey5791

    Acer Aspire 4738 laptop intermittent shut off

    Hi, I tried changed a new 1GB ddr3 ram and assume the old ram is spoiled. Turned on the laptop, go to bios and saw the ram. Restart but windows still failed to boot. It is the same blue screen. That means it is not a ram memory problem. Can anyone help me on this? Thanks for any advice out...
  20. mikey5791

    Acer Aspire 4738 laptop intermittent shut off

    Hi Martin, Appreciate your reply. Initially when i thought it might be the hard disk, so i swap a Windows xp installed hdd. It lasts about 10 minutes running Windows xp, then it goes blank. It is a regret i didn't keep an identical hdd as backup. Nor do i have any restore disks. Whenever i...
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