Re: Asus GL753VE - No video/POST
Earlier when I said there was "no visible damage"... well please strike that from the record. I found this burned area today. It's directly on the other side of the board from the right hand side of this LCD connector....
PTCS
Member
Last Activity: 12-29-2022, 02:25 AM
Joined: 12-04-2011
Location: Oregon
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Re: Asus GL753VE - No video/POST
Asus GL753VE
Board part number 60NB0DN0 - MB1500Leave a comment:
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Re: Asus GL753VE - No video/POST
I will follow though with your request when I get a chance... possibly later this evening. But in the meantime, I did realize today that I don't believe the first mosfet (after the power input) is getting turned on.Leave a comment:
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Asus GL753VE - No video/POST
I am looking at an Asus GL753VE laptop that will not turn on (confirmed defective motherboard). The charge light stays on while plugged into power adapter. Laptop power light comes on with press of power button... stays on until when/if power button is held down for 10 seconds. No other signs of life.
I do not have a schematic for this board.
I have not found any visible signs of damage... water/liquid, heat, or otherwise.
There are 19v, ~5.5v, and ~3.3v at many various places in the board.
The chipset warms up a little when the laptop is powered up.
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Re: Question about Power Supply voltages
One last bump before I give up and return it as-is. Thanks to all who have tried to help.Leave a comment:
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Re: Question about Power Supply voltages
Well I finally found the time to reassemble the TV for testing after bypassing the open circuit (JR8). Unfortunately, it did not change anything that I can tell. Still no backlight or other signs of life beyond the "power" indicator turning to blue.
Does anybody have any further suggestions?Leave a comment:
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Re: Question about Power Supply voltages
I double checked the transformers. Both are 36 ohms (in circuit). Is this test usually done in circuit?
I still haven't had a chance to test the unit after "repairing" the open circuit 0 ohm resistor yet...too many projects at the same time right now. Hopefully I can clear some room on the bench before this weekend is over.Leave a comment:
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Re: Question about Power Supply voltages
Thank you for your help. The readings from what you have marked as S1>S2 is 36.46 Ohms, and S2>S3 is 37.34 Ohms. S3>S4 is also similar at 37.13 Ohms.
Good eye on the joints...The upper one you marked is a little grey, but does have continuity. The lower two are one of the capacitors that was changed before I got the TV.
While getting the readings you suggested, I did stumble on a 0 ohm resistor that was open (JR8). Since these are simply used as jumpers, I have soldered in a temporary...Leave a comment:
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Re: Question about Power Supply voltages
I have not specifically tried to see how long the TV would stay on, but the TV has stayed on (blue light) as long as I have let it so far. Currently it does turn off when the power button is pressed. I think at this point, it is safe to reassemble the LCD panel and then I can specifically test this further.
Please note from my original post, that I received the TV after a cap kit had been installed, and was told that before the cap kit the TV would often NOT turn off when told to (but it still had a picture at that point)....Leave a comment:
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Re: Question about Power Supply voltages
No, no backlights at all.Leave a comment:
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Re: Question about Power Supply voltages
The caps in this one all appear in perfect physical condition. Resistance wise, they all test as open circuit. Also, for what it's worth...all of my CCFL bulbs are nice and white (no discolored ends). The solder joints all look good as well.
An excellent idea...kinda reminds me of the old days with my old Simpson 260 on the ohms scale. In the relative mode, I am getting readings of about 10pf-20pf. Although possibly out of spec, probably fine?
I suppose at this point, I should...Leave a comment:
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Re: Question about Power Supply voltages
Thank you for your responses. As mentioned in my original post, I have verified all voltages as correct with the possible exception of the 20v pin that is measuring 24 volts. Your first reply gave me enough information to verify that 24v is also acceptable (searching the alternative product numbers).
Based on your second response, I pulled the backlight assembly and tested a random few of the backlight capacitors (out of circuit). They are the same 10pf 6kv as your referenced pictures, and are averaging about 132pf. However,...Leave a comment:
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Re: Question about Power Supply voltages
I have added a photo of the power supply and main boards to the original post. PS is the Proview design...part number IPOS 150, REV. 1.8Leave a comment:
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Question about Power Supply voltages
I have an Element FLX-3211B LCD TV that will not turn on. Before I received it, somebody installed a "cap kit" in the power supply. I was told that before the cap kit, it would often not turn on or sometimes even off when the power button was pressed. It eventually died completely. After the cap kit, the only signs of life are the standby indicator on the front of the TV turns from red to blue when the power button is pressed. On the power supply, the red LED flashes most of the time when "on".
In the "on" condition, the power supplies voltages are...Last edited by PTCS; 06-14-2012, 04:30 PM.
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