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#1 |
The Boss Stooge
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 240V @ 60Hz
I'm a: Professional Tech
Posts: 13,724
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![]() I've got a stumper, I can't pinpoint whether it's a tcon, tab bond, or signal process issue. Temps cold/hot don't seem to affect it....sometimes it's just perfect as can be, most the time it looks like this:
This is an overscan crosshatch, where it appears ok....but it's still doing it. I've cleaned the ribbon contacts till I'm blue in the face, no change. Poking/twisting/applying pressure to the signal processor/TCON board doesn't change anything...neither does it change anything with the tab bond PCB's. There's no rhyme or reason to the malfunction at all....as a matter of fact, as I typed this, it straightened itself right out and is pretty as a picture (pun intended). PSU is putting out correct & stable voltages....I'm kinda baffled by this one....perhaps some of you more experienced TV guys might have some feedback. This belong to a customer, dropped off with the usual instructions of "I don't want to spend a whole lot" ![]() The boards: Any input would be super.
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#2 |
Badcaps Veteran
Join Date: Feb 2013
City & State: SA
My Country: Germany
I'm a: Professional Tech
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![]() the panel LC470WUH 120Hz 3D one. for testing need to use 1080P photo mage only (not pattern image)
if the displaying show perfect picture after while , its of sure currents issue at PSU. Volts are corrects but with no juice (currents) |
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#3 | |
The Boss Stooge
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 240V @ 60Hz
I'm a: Professional Tech
Posts: 13,724
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![]() Quote:
Maybe you're onto something, some patterns would display fine, while others would garble when running the burn-in loop. Voltages were correct with the set powered on, but not fed any signal....but when displaying some patterns (all are in 1080P), I could hear a faint whistle/buzz/hiss from the area where the ribbons interface with the tab bond panels. That said, some of the 'troublesome' patterns would also display perfectly at times. The PSU is made by Delta. |
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#4 | |
Badcaps Veteran
Join Date: Feb 2013
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![]() Quote:
resolution supported by the panel the highest 1080P, so we need to use only highest resolution which are the best will be ( Photos )to displaying. |
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#5 |
The Boss Stooge
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 240V @ 60Hz
I'm a: Professional Tech
Posts: 13,724
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![]() I edited my above post before you responded....but the patterns are in 1080. Sencore VP403 supports these resolutions. I did connect a PC. I'll recheck the PSU out voltages. The whistle/buzz/hiss is coming from the top of the panel somewhere, not the PSU...as per the edit. It changes with various images.....kind of a benign symptom, I hear this in lots of sets.
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#6 |
The Boss Stooge
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 240V @ 60Hz
I'm a: Professional Tech
Posts: 13,724
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![]() As before, being driven in max resolution.....
Desktop I measured the voltages with each varying image, there was no fluctuation. 1) 5.3v 2) 5.3v 3) 5.3v 4) GND 5) GND 6) GND 7) GND 8) 12.3v 9) 12.3v 10) 12.3v 11) 2.4v 12) 3.4v 13) 0.2v 14) 2.4v Just a FWIW.....note how garbled the window is, but the text behind it is perfectly legible.....just a bizarre observation. |
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#7 |
Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
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Posts: 39,054
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![]() Pictures of the T-CON board?
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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=24809 |
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#8 |
The Boss Stooge
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 240V @ 60Hz
I'm a: Professional Tech
Posts: 13,724
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![]() Here's the high resolutions of the ones above.
The tcon and signal processor are all one board on this model. If you need closer up I can get you some tomorrow. |
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#9 |
Badcaps Veteran
Join Date: Feb 2013
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![]() in such issue of distributed displaying we need to Testing the set with out any out source video processing circuit, such you are now using HDMI Input. USB INPUT or TEST CH48 Tuner signal ...are direct methods for test, as both using the SET video processing circuit.
so in case you dont have RF Channel test equipment's ..Copy different resolution test JPEG Photos on USB drive and play them direct on the set. |
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#10 | |
The Boss Stooge
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 240V @ 60Hz
I'm a: Professional Tech
Posts: 13,724
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#11 |
Badcaps Veteran
Join Date: Feb 2013
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![]() LVDS could be issue too.. so they need deep inspection at both ends with very good magnifier
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#12 |
Badcaps Veteran
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![]() one things more could be issue too. the MFC section at firmware.. from service menu if you do hard reset will be enough.
so for me i dont think its hardware (parts) defect. just the points i mentioned or we have leak bad soldering some where.. |
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#13 |
The Boss Stooge
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 240V @ 60Hz
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Posts: 13,724
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![]() I've tried every trick I know of to access the service menu....not working. https://factory-reset.com/wiki/Vizio_Service_Menu
FWIW, when it was cold, it displayed perfect for about ~5 minutes....then garble. |
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#14 | |
Badcaps Veteran
Join Date: Feb 2013
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#15 |
The Boss Stooge
Join Date: Oct 2003
City & State: Salem, MO
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Line Voltage: 240V @ 60Hz
I'm a: Professional Tech
Posts: 13,724
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#16 |
Badcaps Veteran
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![]() search after main boards No. not model. Vizio some models belong to other brands..
about cold or warm state it garble. when it start garble plug it from wall socket and plug it on again. if it show clear display then its MFC FW. if it garble then its related to cold & warm of parts |
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#17 |
Badcaps Veteran
Join Date: Feb 2013
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![]() i found on net .. service menu from the panel at the tv side press menu and immediately followed with power
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#18 |
The Boss Stooge
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 240V @ 60Hz
I'm a: Professional Tech
Posts: 13,724
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![]() Maybe its getting narrowed here. Cold air anywhere on the PSU renders no changes. Same with the tab bonds, nothing changes. If I blast the tcon/signal processor board, things happen. The 'garble' changes patterns but never straightens out. Looks like perhaps some reflowing is in order.....but atleast it eliminated the PSU and the tab bonds.
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#19 |
The Boss Stooge
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 240V @ 60Hz
I'm a: Professional Tech
Posts: 13,724
|
![]() The focus of attention is now this chip/area.
If I hit that chip with the air, the display goes nuts and actually freezes up until the chip warms back up. Never do I get a 'normal' image on the display. Hitting the CPU (inside the can) has no affect. Neither do any of the tuners/IO areas. It's down to something in that TCON chip area (tcon was my original suspect, but couldn't confirm). I've reflowed this area several times, it has no corrected the issue. |
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#20 |
Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,054
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![]() There are some SMD Lytics cap in that T-CON section on the main board, may be you can try pin point cold spray on those caps.
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