Re: Vizio XVT553SV Powers on and has sound but no picture
Wanted to update this.
I received the replacement T-con and the TV works perfect now.
Thanks for everyone's help....
1997eclipsegst
Senior Member
Last Activity: 10-08-2023, 09:45 AM
Joined: 02-07-2013
Location: Ohio
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Re: Vizio XVT553SV Powers on and has sound but no picture
After looking at the T-con a little closer I noticed one side of the gpu was pulled up and the board was a little warped in that area. I decided to not even try a reflow and just ordered a replacement board.
I will update when the replacement board arrives.Leave a comment:
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Re: Vizio XVT553SV Powers on and has sound but no picture
I have been able to get a couple laptops working with a reflow but have only lasted a couple moths before failing again. A full reball of the gpu is recommended.
But if this would at least show me that it would work I would know that everything else is good before ordering a replacement Tcon.Leave a comment:
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Re: Vizio XVT553SV Powers on and has sound but no picture
Thanks for the reply MisterD.
I reseated the ribbons and connectors with no change.
I had the set on for a couple of hours (with no change to the picture) and noticed the large black heatsink was cool to the touch (room temperature) I would have assumed it would be a little warm?
The heatsink is held on with 4 spring loaded clips so I decided to take it off and have a peek underneath.
It appears that the gpu underneath is simmilar to a laptop gpu. I have had a...Leave a comment:
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Vizio XVT553SV Powers on and has sound but no picture
Hey everyone,
I am working on a Vizio XVT553SV 55" LED tv and not sure what else to check.
When I received the set it would power on with backlight and sound but would not display any picture.
Voltages to the mainboard:
Fuse
F1-12.14 vdc
F3-5.07 vdc
F8-18.34 vdc
Tcon:
TF1-12.03 vdc
F4-5.12 vdc
After reading many posts about these and mainboard issues that they have I purchased a replacement mainboard from a "refurbished tv broke in transit" on ebay.
After swapping the...Last edited by 1997eclipsegst; 10-31-2014, 01:11 PM. -
Re: Samsung LN46C600F3FXZA No backlight
Budm,
Testing off the negative leg of the 450Vdc cap fuse FS802s reads 390vdc on each side. I originally was testing with the ground probe on one of the grounding screws of the power supply.Leave a comment:
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Re: Samsung LN46C600F3FXZA No backlight
Thanks for the reply
With the cable disconnected between the power supply and mainboard I plugged the power supply in and get nothing from the backlights, not even a flicker.
I checked Fuse FS802S and reads 307vdc on each side of the fuseLeave a comment:
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Re: Samsung LN46C600F3FXZA No backlight
Hi Budm
Thanks for the reply and schematic
I just went and double checked pin 18- Pow_on/off and it reads 0.00vdc when the set is off, and when the power button is pressed it will change to .88vdc and nothing higher.Leave a comment:
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Samsung LN46C600F3FXZA No backlight
Hi everyone,
I am working on this set I picked up off Craigslist.
When I turn it on I get the normal Samsung chime but the backlights never come on. I can take a flashlight to the panel and see snow being displayed on a channel with no signal. If I hook up my cable line I get sound as well.
A couple things I have tried already:
Unplugged the mainboard from the power supply to see if the backlights would come on. No difference.
I read on the forums that the JP852 jumper may cause the backlight to flicker and that it should... -
Re: AOC A42HD84 42" Plasma Bad Picture
tom66,
Sorry for the late reply. Here are a couple pictures of the Y-Main...Leave a comment:
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Re: AOC A42HD84 42" Plasma Bad Picture
There are 4 adjustment pots on the Y-Main labeled
VR5001
VR5002
VR5003
VR5004
They don't have any other markings by them. I downloaded the service manual for this set and the one in the manual has completely different Y-Main and X-Main boards.Leave a comment:
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Re: AOC A42HD84 42" Plasma Bad Picture
Just tried resetting picture settings to default and tried to adjust different picture settings with no improvement.Leave a comment:
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Re: AOC A42HD84 42" Plasma Bad Picture
Tried just pressing it, holding for 5 and 10 seconds, and powering on with the button pressed and nothing happens.Leave a comment:
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Re: AOC A42HD84 42" Plasma Bad Picture
Picture of headers...Leave a comment:
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Re: AOC A42HD84 42" Plasma Bad Picture
I don't see anything that would indicate a mode for a test pattern.
The only thing I can see is a number 1 and 3 almost printed on top of each other. It is the same on both sides of the 3x2 header. The other header is labeled 1 thru 5Leave a comment:
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Re: AOC A42HD84 42" Plasma Bad Picture
Picture of the logic board...Leave a comment:
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Re: AOC A42HD84 42" Plasma Bad Picture
Tested voltages at the connector going to the X and Y main boards
X-Main
1 VDD 5.2
2 VCC 15.0
3 GND
4 N/C
5 VE 84.0
6 N/C
7 GND
8 GND
9 N/C
10 VS 204.5
11 VS 204.5
Y-Main
This board was not labeled. Started from top to bottom
1 204.5
2 204.5
3 N/C
4 GND
5 N/C
6 195.2
7 N/C
8 GND
9 -190.2
10 GND
11 14.9
12 5.2
VA is going...Leave a comment:
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Re: AOC A42HD84 42" Plasma Bad Picture
The power supply has test points for the following and the voltages adjusted to the panel sticker specs
VA 70
VS 204
VSC -190
VE 84
Vset 195Leave a comment:
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AOC A42HD84 42" Plasma Bad Picture
Hey everyone,
I am working on a older AOC A42HD84 Plasma that turns on and works but the picture is really washed out and dim.
I have verified the proper voltages on the power supply from the panel sticker.
Checked fuses on the Y and X main and both are good.
I ran the set for 15 mins and felt the heatsinks on the Y and X main and both are warm but it seems that the X main is a bit warmer.
It seems like some of the pixels get "stuck" on certain images then return to somewhat normal (but dim and washed out) when... -
Re: Samsung PN42C430 Plasma no picture please HELP
The tv I worked on was a RCA 42PA30RQ with these Samsung internals. The power supply would not stay at panel voltage with the X-main disconnected.Leave a comment:
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