Vizio D48-D0 10241020222, backlight ON, no picture, new boards

[joeblah]

Hello all,

Have a Vizio D48-D0, 10241020222. S/N starts with LAUSTWBS.

The TV powers on, backlights present, no picture (not sure if this TV makes a sound on power up, but no sound heard). No special blinking LED code on front panel. At power up, the backlights look bright, then for about a second, the backlights go out, then they come back on, but look a bit dimmer than they did at power up (no picture throughout that process).

The power board is a 0500-0605-0940. The main board is a 3648-0202-0395. ShopJimmy sold both boards for $50 total, so I ordered SJ-KIT-D48-D0-K1. Received the boards, listing said compatible with S/N LAUSTWBS, but the main board bar code had a slight difference. The original main board was 3648-0202-0150(3B), but the board from ShopJimmy is a 3648-0202-0150(3D). May that be the problem?

I removed the old boards and put in the new kit from SJ. Here are the pin readings:

NEW MAIN BOARD AND NEW POWER BOARD:
CN301: LED1+: Pin 1: 63.7VDC
CN301: LED1-: Pin 2: 1.8VDC
CN301: LED2+: Pin 3: 63.7VDC
CN301: LED2-: Pin 4: 1.8VDC
CN301: LED3+: Pin 5: 63.7VDC
CN301: LED3-: Pin 6: 1.8VDC
CN301: LED4+: Pin 7: 63.7VDC
CN301: LED4-: Pin 8: 1.8VDC
CN301: LED5+: Pin 9: 63.7VDC
CN301: LED5-: Pin 10: 1.8VDC

CN201: PWM5: Pin 14: 3.3VDC
CN201: PWM4: Pin 13: 3.3VDC
CN201: PWM3: Pin 12: 3.3VDC
CN201: PWM2: Pin 11: 3.3VDC
CN201: PWM1: Pin 10: 3.3VDC
CN201: Boost LED current: Pin 09: 0
CN201: Backlight: Pin 08: 3.3VDC
CN201: PS-ON: Pin 07: 3.3VDC
CN201: GND: Pin 06: 0
CN201: GND: Pin 05: 0
CN201: GND: Pin 04: 0
CN201: +18Vsb: Pin 03: 18VDC
CN201: +18Vsb: Pin 02: 18VDC
CN201: +18Vsb: Pin 01: 18VDC

Here are the readings from the old boards:

OLD MAIN BOARD AND OLD POWER BOARD:
CN301: LED1+: Pin 1: 64VDC
CN301: LED1-: Pin 2: 10VDC
CN301: LED2+: Pin 3: 64VDC
CN301: LED2-: Pin 4: 10VDC
CN301: LED3+: Pin 5: 64VDC
CN301: LED3-: Pin 6: 10VDC
CN301: LED4+: Pin 7: 64VDC
CN301: LED4-: Pin 8: 10VDC
CN301: LED5+: Pin 9: 64VDC
CN301: LED5-: Pin 10: 10VDC

CN201: PWM5: Pin 14: 1.6VDC
CN201: PWM4: Pin 13: 1.6VDC
CN201: PWM3: Pin 12: 1.6VDC
CN201: PWM2: Pin 11: 1.6VDC
CN201: PWM1: Pin 10: 1.6VDC
CN201: Boost LED current: Pin 09: 11mV
CN201: Backlight: Pin 08: 3.3VDC
CN201: PS-ON: Pin 07: 3.3VDC
CN201: GND: Pin 06: 0
CN201: GND: Pin 05: 0
CN201: GND: Pin 04: 0
CN201: +18Vsb: Pin 03: 18VDC
CN201: +18Vsb: Pin 02: 18VDC
CN201: +18Vsb: Pin 01: 18VDC

LED issue? Part discrepancy between the (3B) and (3D)? My headache meter is pegged. I can't remember SJ ever sending me a bad/incompatible part.

Any suggestions would be greatly appreciated!

[dskall]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

T-con? What was your original problem?

[joeblah]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

T-con? What was your original problem?

I thought t-con too, however, there is no t-con (unless it's hidden really well). Original problem is same as current problem.

[xeroextre]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

I thought t-con too, however, there is no t-con (unless it's hidden really well). Original problem is same as current problem.

The part number stops before the parenthesis, anything after that is factory info and not relevant. The 12 digit part number (3648-0202-0150) is the same on both boards so it's the same part.

So you have the same issue now as you did originally, no video WITH backlight on, it's highly likely that the display panel is bad since this model has no T-CON, and you've already swapped out the main board. The LED strips are working since they are on as you stated earlier. There's a small chance the main board we sent is defective, I'd say 10% or less.

Keith M.
(Technician at ShopJimmy)

[budm]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

The panel has integrated T-CON so there should be a SMD fuse the long board of the panel that you need to find out if it is getting the switched 12v to both ends of the fuse or not.
BTW, what is the LCD panel model number?

[joeblah]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

The part number stops before the parenthesis, anything after that is factory info and not relevant. The 12 digit part number (3648-0202-0150) is the same on both boards so it's the same part.

So you have the same issue now as you did originally, no video WITH backlight on, it's highly likely that the display panel is bad since this model has no T-CON, and you've already swapped out the main board. The LED strips are working since they are on as you stated earlier. There's a small chance the main board we sent is defective, I'd say 10% or less.

Keith M.
(Technician at ShopJimmy)

Ah, okay, thanks Keith.

[joeblah]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

The panel has integrated T-CON so there should be a SMD fuse the long board of the panel that you need to find out if it is getting the switched 12v to both ends of the fuse or not.
BTW, what is the LCD panel model number?

Thanks, bud. I have 12.5VDC on both sides of the SMD fuse you mentioned. Not sure about the LCD panel number. Attached are some pictures, but I Google'd all the numbers and didn't find anything helpful.

15Y_R48FF11MB7S4LV0.2
U33341E5K16ML
LSC480HN08
CS160109D
1813-0302-2011
1713-0302-2010
MV-0SE88441
D99S3

[Hamie]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

There are various test points on the board.

Avdd_17v (obviously should be 17v)
3.3v ( same as above.

Then look for other points like sda, vgl, vone, voffe.

post results of all the test points you can see.

[Hamie]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

PS, either I'm blind or just completely looking at this the wrong way.... But where are the COF that connect to the panel?

[joeblah]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

There are various test points on the board.

Avdd_17v (obviously should be 17v)
3.3v ( same as above.

Then look for other points like sda, vgl, vone, voffe.

post results of all the test points you can see.

Hey Hamie, thanks for the info. Here are some better pictures and measurements:

AVDD_17V: 172mV
VCC: 3.3V
VOFF_-11V: 110mV
ATD_MON_T: 1.7V
ATD_MON_D: 13mV
VCC_1.8: 1.8V
WP: 3.3V
SCL: 3.3V
SDA: 3.3V
MON_L: 334mV
MON_R: 334mV

All of the other test points ranged from 10mV-340mV.

[Hamie]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

OK so you have a problem somewhere.
I'd check all the smd caps and see if any are shorted.

[joeblah]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

OK so you have a problem somewhere.
I'd check all the smd caps and see if any are shorted.

Hamie, most of the SMD caps on that particular board are open, a few in close proximity to each other measure ~1kΩ. That was done in-circuit, though.

[budm]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

https://www.badcaps.net/forum/attach...9&d=1487372049
See those two ICs with two small inductors with '100', '220' on tops?
Those IC are part of switching power supplies that generate VGH, VGL, etc.
Get the P/N and look up the spec sheets so you can see if they are generating the Voltages or not.
Example:
http://tvrepairsolution.blogspot.com...lcd-panel.html

[draxsin]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

Hello,

I'm having a similar issue with this board. I just replaced the main board on a Vizio D48N-80 which restored functionality to the TV. The output is distorted though. The same board discussed here is used in this TV. I found that one of the small inductors labeled 220 is shorted to ground on the board that has been discussed on here. I can't find a replacement board so I need to attempt a component level repair.

Thank you

[gmandman]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

Tried to find a proper place to post this question but could not - I have a Vizio D48-D0 with no power. Replaced the power supply board, nada. Looking to replace the main board - cheap enuff on ebay. Anyone know if you can sub a 3648-0202-0150(3E) for a 3648-0202-0150(3B)?

[nomoresonys]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

.

[nomoresonys]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

See if thats a match, on left in red it says works with starting serial nos. your number is there, you can call them to verify. https://www.shopjimmy.com/vizio-3648...0-laustwbr.htm

[nomoresonys]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

Both boards there for 50 bucks. https://www.shopjimmy.com/vizio-d48-...-version-1.htm

[nomoresonys]

Re: Vizio D48-D0 10241020222, backlight ON, no picture, new boards

Plenty there from 13.50 on up. https://www.ebay.com/sch/i.html?_fro...acat=0&_sop=15