I replaced two caps, 10uf 450v worked for a week, then heard a pop opened it cars were fine. I ordered new psu popped it in. The screen will not stay on have audio. It flashes on only for less the a second. What should I check next.
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Re: Memorex T3321
Photos please, would be great. Including photos of the old and new PSUs.
Where are the capacitors located that you replaced? (Do you know what their function in circuit is?) What were the original capacitors? What did you use for replacements?
Something going pop was probably something blowing. Maybe a fuse, maybe a component. Inspect the boards carefully for burnt components under good daylight."Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHorn -
Re: Memorex T3321
Ok The Board is <img src="https://07c64c6ea680b4fd723b32b6563c24fa3e5fef68.googledrive.com/host/0By-2rqlHK3Ked3FsYkQyNTA5ZWs/2014624192321.jpg" style="max-width:100%" alt="Powerboard" />. I think it was part of the board that popped , i have a new oneComment
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Re: Memorex T3321
Link doesn't work, please upload your photos to the forum, that way others can use them for future reference too - external links have a habit of eventually disappearing
"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Re: Memorex T3321
It looks like there has been arc-over between two tracks in that area. Did you clean it?
Can we get a photo of the other side of the PSU too, to see what is going on there?
Was the new PSU brand new or used? Can you post photos of it also? Preferably the inside of the whole set also.
With sound but no picture could be a backlight issue. Do you get sound even with the screen off, or does everything eventually stop? If you shine a bright light on the screen, can you make anything out? (works better at night) It could be the lights\inverter is bad but everything else is working."Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Re: Memorex T3321
Yea,i Cleaned It. Before IGot the New One. The New Is Used I Got It From Ebay. What Would Keep The Lamps Off .
the first two are the new oneAttached FilesComment
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Re: Memorex T3321
Check the DC voltage on BK_ON (bancklights ON) pin of the CON4.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: Memorex T3321
I need see the voltage when the TV is OFF and when the TV is on, it should toggle.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: Memorex T3321
ok im going to check nowComment
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Re: Memorex T3321
ok just tested from the con4 when off there is zero volts when i power up its 4.8 voltsComment
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Re: Memorex T3321
OK, so it is getting the backlights ON signal OK. So the two 10uf 450V caps on the new board look OK.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: Memorex T3321
well the backlights just flash really quick, yea there looking fineComment
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Re: Memorex T3321
how do you test the d10 diode, and what part might that play in the invertComment
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Re: Memorex T3321
I believe the D10 has to do with the standby power supply.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: Memorex T3321
ok if this helps before the first board went bad, it worked fine i had changed caps, they were cheap ones , then it worked for three day and now in this spot stuck not sure where to go fromhere.
What circuit keeps the lamps on , why would the lights just flash on but not stay onLast edited by Mark562; 06-30-2014, 12:23 PM.Comment
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Re: Memorex T3321
Any idea how to check inverter circuitComment
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Hi Peeps.
Just a quick question please as I am by no means an Apple fundi at all.
Can a 'popped' battery cause the Macbook to be completely dead? Client said the battery definitely popped. It doesn't look swelled or anything but it doesn't switch on at all. No lights, no fans, nothing.
Also, using a 85W original Apple charger. That is working for sure. Does it need more wattage?
Don't want to go buy a battery for no reason.
Client is adamant is worked before the battery popped and I can't see any damage what so ever on the board... -
Had another one of these 70 inchers from onn and was same problem as others. The picture shows but no backlight. The backlights test fine. The issue is the 450v 10uf capacitor by the backlight connector. Usually the cap bulges, the cap I replaced today for fix was NOT bulging. Replaced anyway and fixed.
Hope this helps someone.... -
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