Hey guys. I have a ViewSonic N3735W that powes on, the backlight lights for about 2 seconds and then turns off. power supply and light on the front stay lit.
Any ideas?.
Ken
Any ideas?.
Ken
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Re: Viewsonic N3735W
Most likely the "2 seconds to black problem."
One guide to troubleshooting (more applicable to LCD monitors, but still relevant):
https://www.badcaps.net/forum/showthread.php?t=10419
Start by posting good, clear pictures of your TV's internals, including one of each board and one of the overall layout.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search. -
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Re: Viewsonic N3735W
Please edit your post and use the Managed Attachment to upload the pictures, thanks.
Darfon transformers!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=24809Comment
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Re: Viewsonic N3735W
anyone have any ideas?>Comment
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Re: Viewsonic N3735W
Ugh, back at uni, slow internet, please DO NOT post pictures in-line! Always upload them using manage attachments.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Viewsonic N3735W
I apologize for that, I wont ever do it againComment
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Re: Viewsonic N3735W
Lets, check the resistance reading on the high voltage windings of the inverter transformers.
Please take readings of all tansformers on that inverter board.Attached FilesNever 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=24809Comment
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Re: Viewsonic N3735W
Just a note, TV must be off and should be unplugged while doing this.
I have repaired this CPT inverter twice before, 32" version and 37" version, very common failure.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Viewsonic N3735W
Thanks for reminding the newbie that Tom, best is to completely unplug the TV from the out let.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=24809Comment
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Re: Viewsonic N3735W
I have a viewsonic n2060w-1e, not sure if its the same psu or inverter but if you find out i will be happy to take some readings for you.Do NOT touch heatsinks when testing for voltages as they may be LIVE!Comment
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Re: Viewsonic N3735W
8
-242.3
-242.0
7
-304.5
-241.6
6
-242.5
-242.6
5
-242.6
-242.4
4
-242.8
-242.0
3
-242.8
-243.7
2
-245.3
-244.5
1
-243.9
-243.6Last edited by kmoonen; 01-07-2013, 09:11 PM.Comment
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Re: Viewsonic N3735W
The reading I.E. 245.3, what meter range are you using? We cannot tell if it is 245.3 Ohms, K Ohms, Mega Ohms.
The number 7 (304.5) looks bad if I go by comparison readingsLast edited by budm; 01-07-2013, 10:06 PM.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=24809Comment
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Re: Viewsonic N3735W
Sorry. we were using K OHMSComment
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Re: Viewsonic N3735W
That does not sound right then, I do not think it can be in over 200,000 Ohms range. I may be wrong on the pin out in these transformers.
I cannot read the P/N as printed on the top of the transformers, can you please tell me what the numbers are?
It looks like 6019B725013?Last edited by budm; 01-07-2013, 11:04 PM.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=24809Comment
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Re: Viewsonic N3735W
This form factor of transformer should be like this as I had redlined.
http://lcdparts.net/TransformerDetai...ProductID=3812Never 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=24809Comment
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Re: Viewsonic N3735W
4 are 6019B725013(GP) the other 4 are 6020B725008(GP)Comment
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Re: Viewsonic N3735W
I believe what I think the way the transformer are made is correct, I would suggest remove the number 7 transformer so you can look at the bottom side of the transformer to verify the windings for sure.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=24809Comment
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Re: Viewsonic N3735W
A DMM will give a negative reading on ohms if it is either:
a) broken
b) has a voltage applied across the terminalsPlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Hi to all.
This HP board LA-9223P stays on for not more than 5 seconds,
Problem no V-core power .
PL302 3.3+3VALWP OK
PL303 5+5VALWP OK
PL402 1.5 VP OK
PL602 1.8 VSP OK
PL5021.08 VCCP OK
PL1002+1.5V_PCIEP goes to 1.2-8 Mil volt
PL204 .7 Mil VOLT+VGFX_CORE
PL202 2.2 mIL Volt +CPU_CORE
Please Help
Thanks
https://www.badcaps.net/forum/troubl...eed-schematic-... -
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