Question about ViewSonic 17" LCD,8ms,1280x1024,280nits,600:1,170/155,VGA,BLACK Monitor

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Sir I have Viewsoni VA1716W model LCD monitor But power LED not on I measure SMPS output voltage 12V and 5 Volt are available but power led not glow what to do please give me some tips.

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Since the power supply is OK, the next place to check will be the logic board, you need to find out if it is getting the 5vdc feeding it and also check for 3.3v, 1.8vdc, etc voltage regulators on the logic board. So far I cannot find free service manual to download for it.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Posted on Mar 22, 2011

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Posted on Jan 02, 2017

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Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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Hi sir Jim!!!!



kindly check the 5 LED if there is lit lights to diagnose where the fault came from..You said the 5 led turn off for 1 -2 seconds it means no error but still won't turn on I think there sometime wrong on logic circuitry..


1_20_2012_6_55_00_am.jpg

Try to read the voltages on highlighted words on picture of block diagram above such as vs,va,vcc,stby+5v,stby+3.3v,+5.5,+10.5 and +12v...

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Hope it helps...

chester..

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Made pop noises screen flashed considerable hum then no power no sound no nothing


Hi,

This model no. is known for AC power adapter problem. Pop noises, flashes of the screen is an indication of out-of-regulation condition on its power supply. If there's no LED light lit, then high chance that the fault came from the AC power adapter.
This model no. used AC power adapter with a 12 Volts output feed to the unit. You have to confirm the 12V output using the multimeter set in DC measurement.
If the 12V output voltage is not present, then you have to replaced it with new one. This model no. is already discontinued, only substitution is available online which will work also for your unit. You may inquire/call Sears hotline no. (1-888-213-5824) to confirm and order the AC Adapter.
Please let me know if the Adapter is intact to assist you further.
Please rate only if you feel I've gave you the best answer. If you have any question, please let me know.
Have a nice day!
Jdvillanueva

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http://s807.photobucket.com/albums/yy352/budm/Samsung%20205BW/

Attach a 12v bulb to the 12v output of the power supply, do not turn on the power switch because we just wan to lod the power supply with the bulb only, see if the lamp cycle on and off.
Check the DC voltage on the large cap (the one with 250~350vdc rating) on the AC primary side, it should have about 160vdc on it.
Use the hair dryer set to low and heat up the small cap by SMP IC on the heatsink as shown in picture DSCF0585 to see if the output 12vdc is on steady.

All the caps have flat tops and you replace them as a set?

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

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No power


hi: first you will need open the monitor , them look for the power supplu board and with a multimeter measure the out put you shoud have 12v and 5v , if some of this voltage is missing your problem is the power supply board , you can try to fix it or buy a new board and remplace yours, now if you have the output voltage look for the power botton and take a measure in paralle with the switch you need to have there 5v if don't first check that the led is working fine because one i found the led bad and that was the problem , but that depend of the manufacturer construcction . if that led is fine your problem is a litter bit more complicate due that the problem will be on the logic board best solution buy a new logic board and remplace yours. best regards italocub

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