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Compatable IC required for DAP 8A

I have a viewsonic monitor 1912wb ,which is damaged due to lightning.mainly power board is damaged.Power board used Delta DAC-19M005-REV02A - Inverter/Power...(Particularly I required alternative of dap 8A).Plz Help me in this regard it's urgent.

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Http://www.abnet.am/images/Viewsonic_va1912w.pdf

Posted on Jan 28, 2014

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Cap placement on psm217-404-h-r power board with coresponding values picture would be nice


This power supply board is also used in Viewsonic VX2835W. The main problem are 4 bad/defective capacitors and shorted legs due to bleeding of soldering lead (brownish color).

1. 22uf 400v
2. 47uf 50v
3. 1uf 100v
4. 22uf 35v

You can find them near the PWM IC controller (U601). Replaced all these capacitors regardless they look good. I pulled them out off the board and tested them with my Blue ESR and capacitor tester and found 3 were defective.

Next, you need at least 97% Isoprophyl alcohol and toothbrush to clean the soldering paste. Due to overheating on the primary section / HOT section the soldering leads tend to produce brownish paste which is causing the component parts to SHORT. Concentrate at the back of the board, especially at the U102 (16-pin IC) and Q202 by scrubbing these IC and transistor carefully. I used magnifier to make sure the legs are clean and shiny. Clean the rest of the back and some part on top of the board. Let it dry for 2 hours at least. I did 2 times this cleaning to make process.

On my VX2835W main board has 2 bad capacitors at C124 and C126. I replaced them and cleaned also the board with alcohol.

That's it. Good Luck.

Roan Mac
Computer Tech
Chapel Hill, NC

Jun 25, 2011 | ViewSonic N3250W Television

2 Answers

Hi. Monitor start blinking when power of computer was off.next day stop working screen is black. Switch on-off not working. Another monitors working properly.??? Thanks for answer.


Look for bad caps as you can see in my VIEWSONIC VX series albums.
If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed VIEWSONIC monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

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: 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.
Please leave rating if it helps.

Feb 17, 2011 | ViewSonic VX2835wm Monitor

3 Answers

Viewsonic VX2835wm won't turn on. Did the usual troubleshooting but to no avail. I have two others that work just fine. Any suggestions? Thanks!


There are 2 boards/parts involved with this problem

a) The power supply board:

The main problem are 4 bad/defective capacitors
1. 22uf 400v
2. 47uf 50v
3. 1uf 100v
4. 22uf 35v

You can find them near the PWM IC controller (U601). Replaced all these capacitors regardless they look good. I pulled them out off the board and tested them with my Blue ESR and capacitor tester and found 3 were defective.

Next, you need at least 97% Isoprophyl alcohol and toothbrush to clean the soldering paste. Due to overheating on the primary section / HOT section the soldering leads tend to produce brownish paste which is causing the component parts to SHORT. Concentrate at the back of the board, especially at the U102 (16-pin IC) and Q202 transistor by scrubbing them carefully. I used magnifier to make sure the legs are clean and shiny. Clean the rest of the back and some part on top of the board. Let it dry for 2 hours at least. I did 2 times this cleaning to complete the process.

b) The Main Board

The main board has 2 bad capacitors at C124 and C126. I replaced them and cleaned also the board with alcohol.

That's it. Good Luck.

Roan Mac
Computer Tech
Chapel Hill, NC

Aug 13, 2010 | ViewSonic VX2835wm Monitor

3 Answers

I have a viewsonic VX2835wm and when i turn it on the screen turns on for a second and then goes black. How do i re-set the monitor?


In this model the capactors hardly ever dome or vent. Usually you will see the top of the labeling on the capacitor has shrunk a little from it's normal size. If the monitor still has any kind of power (which it does from your comment) you or someone you know can replace those capacitors on the output side of the supply. If you're lucky this will solve your problem. If not, you can always try replacing the four brown electrolytic capacitors on the inverter board (the long board on the left when viewing the monitor from the back). There is a chance this could be caused by the inverter board or even a bad backlight, however I would bet it's the power board. If you don't want to replace the capacitors or replacing them didn't solve the problem, contact Viewsonic at viewsonic.com and get the price of a new power board. They are pretty easy to replace.

Mar 15, 2010 | ViewSonic VX2835wm Monitor

1 Answer

The monitor led is green but it gives white flash and still blank


Check the volatage regulator in the mainboard resolder all you found dried unsolder parts inside mainboard. Voltage test the regulator IC if have a voltage flow 2.5 to 5v DC. check ribbon cable connector from mainboard to controller board if properly connected. In the controller board find the small fuse test it for open.
Reminder:
When you voltage test in the power board
in the primary section of power supply
use hot ground. Do not use the hot ground
when you voltage testing the secondary
power supply, mainboard and controller
because it will cause of damage
semiconductor. For safety use cold ground
for secondary, mainboard and controller
board.

Aug 29, 2009 | ViewSonic VA712 17" LCD Monitor

2 Answers

30 bad VP930B's may have green LED for an instant that's it. No display either.


Yes this is a very common problem on the VP930b. The fault is with the crappy CapXon capacitors (worst in the industry). As mentioned above, replace the 220uF@25V and 1000uF@16V capacitors. The other two never go bad. Make sure you replace the four above even if they look good. I would recommend using 35V and 25V respectively.

Note, if your monitor serial number starts with Q8H you may have a bad IC on the main board. Q8 often goes bad a few months after the capacitors do. If they are warranty they will have to be sent to Viewsonic or a local authorized service center.
If not warranty, you can solder a wire from the 3 pins on the left side of the IC to the four pins on the right side. One pin on the left side is the on/off pin for this IC and should be left alone. This will bypass the IC allowing +5V to the LCD all the time. However, if the monitor ever shows scrambled graphics after turning it on then turn it off using the main power switch in the back and turn it back on, it should be fine.

Sep 10, 2008 | ViewSonic VP930b 19" LCD Monitor

1 Answer

Viewsonic VG919S 19" LCD


Hi

You must focus to mainboard of LCD monitor find the voltage regulator IC. Voltage test the regulator IC use digital or analog multimeter range 10v dc connect the negative to cold ground, these regulator providing a constant supply of 2.5 - 5v to all IC in the mainboard. check the scalar IC. Because scalar IC will convert analog input signal of Red, Green & Blue. Lastly check the controller board, check the ribbon cable connector from mainboard to
controller board for lose, check the fuse inside controller. I think the exact problem of your monitor could be either the (mainboard) or (LCD panel where the controller board is located).

Oct 06, 2007 | ViewSonic VG910S (Black, Silver) 19" LCD...

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