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  1. mikey5791

    Need help to fix motion detector alarm

    Dear Steve & KrisBlueNZ, The alarm uses a 9V battery (not in picture). Will measure the voltage across the board from the battery to the LED and suspect corrosion/dirt or break in the track. Is it possible the sensor is faulty too? Any idea how to test the sensor if it is good ? Does it...
  2. mikey5791

    Need help to build police siren/LED flasher

    Dear Steve & BobK, Will take your advice to trim those leads and re solder those spots that do not cover entire pad. Hopefully to do this by the weekend and post good result. To KJ6EAD, I watched the "How to solder" video and gain more knowledge on soldering properly. Did anyone...
  3. mikey5791

    Need help to build police siren/LED flasher

    Dear all, I recently bought a ready made Project kit with circuit board, parts and schematic attached from a China company. The kit is for LED flasher and police siren; the schematic and parts list which I attached. The problem is the LED 1 & 2 does not flash or any sound from the...
  4. mikey5791

    Need help to fix motion detector alarm

    Dear all, I bought this Motion detector alarm some years ago from a shop vendor initially for home or car use but recently tested faulty, no power led light or "sensor" not working. Anyone got any idea how the "sensor" works? There is no model No. and no schematic can be traced. I have...
  5. mikey5791

    Toshiba CRT TV Model 21S1ES- No picture

    Hi Kris, For weeks I have been searching and calling shops for the IC A8801CPCN4UD7 (Toshiba internal part number 23009669) but not even one place has this IC as this is an old unit. Anyway, will keep this old TV until end of this month and later decide what to do. But if anyone else out...
  6. mikey5791

    Toshiba CRT TV Model 21S1ES- No picture

    Hi Kris, Your explanation on IC marked Q100 is in detail and clear for my understanding. FYI, I had also checked the front video connector which doesn't work (as in not displaying picture). Regarding the damaged part type A8801CPCN4UD7 (Toshiba internal part number 23009669) being a 64...
  7. mikey5791

    Toshiba CRT TV Model 21S1ES- No picture

    Hi Kris, I had emailed you the Toshiba TV service manual this morning. Hope the pdf version is readable. Appreciate very much on your further guide and kind assistance. Thank you.
  8. mikey5791

    Toshiba CRT TV Model 21S1ES- No picture

    Dear KrisBlueNZ, Your reply boost up my persistence to continue on this repair project. I tried attaching the service manual for your reference but failed due to size in pdf is about 3MB (this forum max file size allowed is abt 100kb). Or you may see this link...
  9. mikey5791

    Toshiba CRT TV Model 21S1ES- No picture

    Hi shrtrnd, Replying to your earlier post, you mentioned "you should be checking to make sure you're inputting the video signal to the correct connectors, with the correct signal." Are you referring to video signal from a DVD player as I had tested earlier using a RGB cable...
  10. mikey5791

    Hi Everyone! I am Cathy from China

    Hello from Malaysia Hi, I am newbie here and wish to learn more on electronics. Reading this forum is fun and the knowledge is just unlimited. Keep up the good work !
  11. mikey5791

    Toshiba CRT TV Model 21S1ES- No picture

    Hi shrtrnd, Thanks for prompt reply. The label on the TV rear said " Made in China" and I believe the TV was sold here (Malaysia- the country I resides now) for more than ten years ago. The TV appear used but was thrown away due to some malfunction part. As the set is a CRT type and new...
  12. mikey5791

    Toshiba CRT TV Model 21S1ES- No picture

    Hi Sheldonstv, When I connect a DVD player (output) to CRT TV (input), I am using RGB cable (white,red ,yellow) for audio and video. Not sure how to "set up for cvbs signal to be output from dvd player etc as opposed an rgb signal". Maybe you can explain what is "cvbs signal" as I am not...
  13. mikey5791

    Toshiba CRT TV Model 21S1ES- No picture

    Hi shrtrnd, The RF converter you suggested is it also called RF modulator ? As mentioned earlier, I had connected a DVD player to the input side of this 21" CRT TV, and found audio of DVD played is clear but no picture too. However, when I connect the same DVD player to a working Toshiba...
  14. mikey5791

    Toshiba CRT TV Model 21S1ES- No picture

    Hi, Recently got this 21" CRT TV from junk yard. After blowing dust off the interior and check visually no burnt components, I plug in the power and all TV channel audio & volume seems to work OK but no picture. Later, I tried connect a DVD player to the input side of TV, audio of DVD played...
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