Re: Toshiba 46rv350u No backlight, No picture but has sound
can you check PFC driver IC Q860A for shorts as ive read this can blow fuse f820 too
can you check PFC driver IC Q860A for shorts as ive read this can blow fuse f820 too
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Re: Toshiba 46rv350u No backlight, No picture but has sound
Did you download the diagrams in post #10.
You need to check for shorts:
D809
D820 PFC
Q820 PFC
Q821
Q860 SMPSLast edited by budm; 08-27-2016, 01:01 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: Toshiba 46rv350u No backlight, No picture but has sound
Give me a few to check. thanksComment
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Re: Toshiba 46rv350u No backlight, No picture but has sound
D809 no short
D820 PFC no short
Q820 PFC no short
Q821 no short
Q860 SMPS some pins have continuity with each other. I have no idea if thats normal and do not know how to test this part correctlyLast edited by fg42pr; 08-27-2016, 01:23 PM.Comment
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Re: Toshiba 46rv350u No backlight, No picture but has sound
what is the part number of the ic at q860 then we cah get a data sheet i think its a STR-Z2589 8208 if so theres a data sheet in post 14 of this thread https://www.badcaps.net/forum/showthread.php?p=661588Last edited by vinceroger69; 08-27-2016, 01:31 PM.Comment
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Re: Toshiba 46rv350u No backlight, No picture but has sound
q860 PICTURE
Attached FilesLast edited by fg42pr; 08-27-2016, 01:31 PM.Comment
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Re: Toshiba 46rv350u No backlight, No picture but has sound
as per budms advice in the thread ive posted the link for maybe test this
OK, the only load for that F820 fuse is that STR-Z25XX series, so the internal short may be half of the bridge drive power MOSFETs may be shorted out.
You need to check the resistance between pin 5 and pin 1 (for the upper MOSFET), then pin 1 and pin 21 for the lower MOSFET to see if one of them is shorted out or has very low resistance. Make sure you count the pin correctly.Comment
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Re: Toshiba 46rv350u No backlight, No picture but has sound
pin 1 and 5 133 ohms
pin 1 and 21 14.8 m ohmComment
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Re: Toshiba 46rv350u No backlight, No picture but has sound
actually i am getting odd reading on pin 1 and 21 starts off at 7 m ohm and drops down to around 3 m ohmsComment
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Re: Toshiba 46rv350u No backlight, No picture but has sound
my guess is ic is bad lets see what budm says before you order one and another resistorComment
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Re: Toshiba 46rv350u No backlight, No picture but has sound
now pin 1 and 5 read .402k ohmComment
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Re: Toshiba 46rv350u No backlight, No picture but has sound
maybe remove the ic and retest?Comment
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Re: Toshiba 46rv350u No backlight, No picture but has sound
I'll have to wait until my new solder sucker comes in for removal, mine just died out. I'll get back Monday or so whenever it comes in.Comment
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Hello everyone,
Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
Anyway I still fully expect that there has been something seriously damaged... -
this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
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unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
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Hello,
This TV came in for a backlight Repair. I bypassed the Burnt LED as shown in Picture. I thought it was fixed and returned to customer. So I dont have the TV anymore, but customer says its not really watchable.
Now the TV Is much dimmer than before. It does a quick bright flash when it first turns on.
The Driver board looked pretty toasty in the LED Driver Area.
So I am wondering.. how can i Tell if this is a LED or Driver Board Issue?...
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