Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

[jason123]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

Only AC_DET is 4V
+12VS is 12.54v

[Diah]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

AC_DET = 4V. but at yours first post you wrote PS-ON 5 V

[Diah]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

run the PSU alone.. jumper AC_DET and Power ON. and AC_DET to T-CON On. it should have all voltage 12 tcon and 12+ and 24V to led

prefer ac_det to T-CON on with R1k or less

[jason123]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

AC_DET = 4V. but at yours first post you wrote PS-ON 5 V

When i connect main board and turn set on Ps-on goes to 5v

[Diah]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

need to simulated the PSU as stand alone to be sure its all V produced,

[jason123]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

Ac_det connected to PS_ON and TCON ON all the voltages are present

[Diah]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

i know its hard work and risky to take screen apart but i do believe on my early post .. all up to you friend.

i am back to my first post statement you have 99.9% shorted / Open LED ziner diode at BL

test with DM on diode mode one direction led should lit dimm and when change opposite probe should read ziner fw current.

the rest 0.1% mainboards (Main IC BGA / SPI - NAND Glitched )

[jason123]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

Yes. As soon as you pull Tcon On pin high 12 V Tcon comes up

[jason123]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

I have ordered a new main board. I will give that a shot and if it doesnt work it's time for the dump. I strongly believe the main board is the culprit or i got another bad LED Driver board. I don't know what signals go from main to LED Driver so i can't troubleshoot that.

What i think might have happened is a damage on the main board (overdrive) resulted in damage on the led driver board. Especially that i have tested every LED and they were all good.
Thanks for the help

[jason123]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

New main board did the trick.
Thank you for the help

[budm]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

Thanks for the follow-up on the repair.
You should take all the Voltage readings on the connectors and safe them for future reference, take the readings when TV is OFF and when the TV is ON and running.

[jason123]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

I still have the TV open this time and I can do that.. coming up shortly!

Here you go:
when TV is Off. On the Power Supply Connector CN201:
AC-DET = 3.84 V
+12VS = 12.53

All others are ~0V

CN301:
All around ~0V

Cable between Main board and LED driver - ~All 0V

When ON:
PS CN201
T CON_ON 3.3V
12V T CON 12.42V
+12VS = 12.49 V
12V-AU = 12.42 V
PS-ON = 5.03 V
AC-DET =3.72 V

PS CN301
X000017 pins = 24.42 V

OD = 0V
VSNS = 0V

Main board to LED Driver (I believe this is the dimming or control of which zone is on... Not sure)
From left to right: 3.2 V, 0.67 V, 0.32 V, 0.16V, 0.67 V, .89V, 1.61 V, 5V, 2.01 V

Hope this helps

[budm]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

Was the main board expensive?

[jason123]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

Very $165... spent way more than this TV is worth!

[budm]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

Very $165... spent way more than this TV is worth!

Holy cow!

[jason123]

Re: Vizio P602UI-B3 No Picture or Sound - No TCON Voltage

would anyone know if there is a "focus" like feature for this TV in service menu or so? seems there is bleeding (horizontal) and my M70-C3 seems to have much sharper image / text