Question about ViewSonic Computers & Internet
Hour glass video snapped in and out a few times then lost HV and filament. Found both WH03 connector pins (heavy gauge red wires going from main PCB to CRT) burnt and solder completely blown out of their PCB pin connections (both open). Re-solder did nothing. QH06 2SC5584 checks okay with DVM. No other visible component damage or cold solder joints found. Power on clicks the relay which drops out after about 6 seconds. Green power on light eventually goes to flashing orange light. Schematic component text only 70% readable. Model No. VCDTS21692-1M
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Posted on Jan 02, 2017
the T at the end of those STK means they are made in China. Start there first. Those are factory reject or aftermarket type ICs. You should always use the Sanyo IC's. Those are original replacement ICs. We all know how China has been making things these days. You can get the right IC's from here http://www.electronic-repair-kits.com/STK392-110.htm If you still have a problem after that, you will need to get a service manual and send it to me to have a look. Good Luck
Posted on Sep 26, 2007
SOURCE: NAD C370 in protection mode
With closed eyes -replace all capacitors on protection PCB
All of those caps are overheated and dry out (they lost there capacidance).Note that capacidance meter will not help you at all.
Now unit will work.
Check four big filter capacitors in the middle of unit!!!!
If they are white (NAD 10000uF/80V) DO NOT USE UNIT AT ALL!!!!
Posted on Feb 13, 2008
SOURCE: Blinking Light
This is the same problem with my 4 VG800 Monitors, you should be able to find the correct capacitor on your monitors by following the same procedure, I'm sure the boards are similar. Just get the correct value capacitor and try it in parallel with the initial filter capacitors right after the DC power in.
Alright, I had 4 VG800 monitors with the exact same problem. The front led is blinky OR constant reddish/orangish OR picture is white with colored vertical lines OR no picture with whistling from the back of the monitor and backlights illuminated. All problems have the same solution. You need to disassemble the monitor (2 screws on the back, remove lower front button panel, remove 2 screws holding panel in and remove speakers, then remove panel and unplug speakers. Now remove lots of tape and screws from the cover in the center of the monitor). Now that you've exposed the amplifier board and the VGA to LVDS board, you want to look for the pair of 25V 100microfarad capacitors that are nearby the DC power in (they are right next to the black "100" inductor). Desolder the capacitor farthest from the DC jack and replace with an electrolytic with the same specifications. If you want to check that this is the correct solution please put the new capacitor (WATCH THE POLARITY) in parallel with the capacitor there want watch the front panel indicator go green and the monitor work properly.
I'll be posting and Instructable entry in the next few days on the process, watch for the username Waterppk on the website www.instructables.com
Posted on Mar 18, 2008
SOURCE: Viewsonic VX922 monitor no power
I had the same problem with my VX924. The two 470uFx25V was blown, and the output diode was in short circuit. I also noticed that the 33R SMD resistor (to pin 6 of SMD IC) was opened. After replaced these parts, the monitor works great.
Posted on Jun 08, 2010
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Some models may have a separate high voltage fuse. If this is blown, there will be no heating but no other symptoms. However, high voltage fuses are somewhat rare on domestic ovens.
A number of failures can result in the fuse NOT blowing but still no heat:
Depending on design, a number of other component failures could result in no heat as well including a defective relay or triac, interlock switch(s), and controller.
If you are interested in doing it yourself the following link will help : Microwave Repair Manual
(**All the above references to tests are found here)
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