I have one of these monitors and it has no video on any input. It powers on but there is no signal. Any thoughts?
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ASUS vw246h no video
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Re: ASUS vw246h no video
Hello alexsquared,
Take the monitor apart,carefully. The second thing you should take good pictures of both circuit boards and post them using the "manage attachments" button under advanced on this site. That way the more experienced members can help steer you in the right direction. My guess is the main (video) board or the screen or even the screen's bulbs are your issue. Are you saying that the power led is lit? I say that because you said that the power comes on.
Good Luck,
lcdman
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Re: ASUS vw246h no video
Can you see on screen user setup menu?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: ASUS vw246h no video
OK, your inverter and T-CON and screen are OK, we need to check the protection diodes for the VGA/DVI input pins next. Can you post good pictures of the logic board, good closed up around the VGA/DVI input also so I can see the surface mounted diodes.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: ASUS vw246h no video
PLEASE post pictures of the logic board! I have one of these that has been kicking around for quite some time due to some damage to the pcb (it would be GREAT if you could check continuity at a few points so I can get past damaged vias on the 22uf caps and the one 10uf.) and schematics for this model have yet to be found. i have them for the 22" and the 26" models but the 24 is neither here nor anywhere far as I can google.
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Re: ASUS vw246h no video
OK, so I finally got a chance to open this bad boy up. Took some good (i believe) pictures of the main board. I did see some discoloration on the PCB that I'll highlight in the pics (pics with MU at end are the marked up ones). Any insight would be greatly appreciated.
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Re: ASUS vw246h no video
Can you please take the DC voltage readings of the two 3-pin voltage regulator IC on the top left corner of the board with reference to ground?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: ASUS vw246h no video
Pardon my ignorance, but I'm assuming you are referring to the IC's I have attached and circled on this post? If so, any indication as to which pin I need to check voltage at, and also helpful would be a recommendation as to where to get a good ground reference. Lastly, I'll have to double check that I can get all ribbon and other cables connected (so I can power on for voltage readings) and still have access to the upper side of the IC for these readings. Any suggestions here would be greatly appreciated.
Part of me is wondering if the best solution would be to obtain a new main board (http://www.shopjimmy.com/asus-5e-0nc...for-vw246h.htm ...I know they are out of stock), however, I would love to fix this on the cheap if possible.
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Re: ASUS vw246h no video
Yes those are the one. Just report the reading on all 3 pins (just make it as 1, 2, 3)Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: ASUS vw246h no video
Any of the points within the yellow perimeter i've drawn will be tied to ground, place your com probe (black) across a few of those carefully and with your meter on dc voltage take a reading of each of the pins on both ic's, start at the top and record them as...
3-
2-
1-
1-
2-
3
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Re: ASUS vw246h no video
This one needs verification. Is 3 the top pin? What voltage do you get (if 3 is the top pin) when you measure between pin 1 and 2. It looks like 1.2V regulator.
3- 1.208 v
2- 0v (no visible connection to pcb)
1- 3.317 v
This one shows OK, 1.25V vref + 2.068 = 3.318V
1- 2.068 v
2- 3.317 v (no visible connection to pcb)
3- 5.053Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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