SONY KDL-46R473A ALMOST DEAD NO STB

[bohaboha]

You don't know what a choke is? It says "2R2" (a coil wound on a ferrite core)!

thank you it is a matter of languages English is not my native , anyhow what do you think about what those shorts and voltages

[bohaboha]

look at this

[bohaboha]

Hi again i took away one of those 3 capacitor but the short still there. even the one near SoC and nothing happened i will go on and take away the choke and se what it gives but it is possible as Diah said the culprit is the SoC MT5367

[CapLeaker]

The problem IS the Mediatek IC. Kinda surprised it held up that long. They were a lot of problems with these Mediatek IC’s back then.

[bohaboha]

The problem IS the Mediatek IC. Kinda surprised it held up that long. They were a lot of problems with these Mediatek IC’s back then.

ok but this one seems to work he is getting a normal temp but of course that old must get tired .but maybe a reflow will take him back to live

[Diah]

you said you don't have 12V on Panel fuse... so check this area where you could find this 12V

[bohaboha]

you said you don't have 12V on Panel fuse... so check this area where you could find this 12V

thank you Diah please look at post 22

[Diah]

then why you wrote no 12v on panel t-con fuse? at time u have it on lvds socket !

[nomoresonys]

Just carefully reflow the mediatek, won't hurt it as long as you don't overdo the heat but too little heat will have no effect. Then try it, might get lucky. Check youtube, plenty of good diy reflow tips there, remember that not all of the youtubers do it right so probably have to wade thru some.

[bohaboha]

then why you wrote no 12v on panel t-con fuse? at time u have it on lvds socket !

because there is no voltage at the fuse and at all the panel Bond both parts i do not find any voltage att all and i do not find any voltage at that socket on your picture just on the capacitor under it there is 12.25V

[bohaboha]

Just carefully reflow the mediatek, won't hurt it as long as you don't overdo the heat but too little heat will have no effect. Then try it, might get lucky. Check youtube, plenty of good diy reflow tips there, remember that not all of the youtubers do it right so probably have to wade thru some.

i have this IRDA SMD And BGA Rework Station T-862++ i am thinking to use to just reflow the chip maybe 220 degres C max use on this one is 350" C i think

[lotas]

i have this IRDA SMD And BGA Rework Station T-862++ i am thinking to use to just reflow the chip maybe 220 degres C max use on this one is 350" C i think

From heating mediatek, you will not have a short circuit on the motherboard.

[bohaboha]

From heating mediatek, you will not have a short circuit on the motherboard.

Then you think it is worth a tray with my tool ? or better to use hot Gun and a good preheating 220" to 230" C

[lotas]

What do you want to do with the Mediatek chip, replace it with a new one, are you sure that it is short-circuiting or do you just want to warm it up and think that the short circuit will disappear.

[Diah]

this MT SoC cant be refllow or heated ,
main function pin out of it

• Pin 1 (VDD): Power Supply Voltage Pin.
• Pin 2 (VSS): Ground Pin.
• Pin 3 (V0): LCD Contrast Voltage Pin.
• Pin 4 (RS): Register Select Pin for Command/Data.
• Pin 5 (R/W): Read/Write Pin for Data Read/Write Control.
• Pin 6 (E): Enable Pin for LCD Controller.
• Pin 7 (D0-D7): Data Pins for 8-bit Data Bus.
• Pin 8 (BLA): Backlight Anode Pin.
• Pin 9 (BLK): Backlight Cathode Pin.

[bohaboha]

this MT SoC cant be refllow or heated ,
main function pin out of it

• Pin 1 (VDD): Power Supply Voltage Pin.
• Pin 2 (VSS): Ground Pin.
• Pin 3 (V0): LCD Contrast Voltage Pin.
• Pin 4 (RS): Register Select Pin for Command/Data.
• Pin 5 (R/W): Read/Write Pin for Data Read/Write Control.
• Pin 6 (E): Enable Pin for LCD Controller.
• Pin 7 (D0-D7): Data Pins for 8-bit Data Bus.
• Pin 8 (BLA): Backlight Anode Pin.
• Pin 9 (BLK): Backlight Cathode Pin.

What to do then ? just change it or new board or maybe find the short

[Diah]

test above listed SoC pins agains GND or pin 2 VSS

[bohaboha]

test above listed SoC pins agains GND or pin 2 VSS

• Here is the result
• Pin 1 (VDD): Power Supply Voltage Pin = 2.65V and loop from to 2.704 V
• Pin 3 (V0): LCD Contrast Voltage Pin.0.039V
• Pin 4 (RS): Register Select Pin for Command/Data.0.35o loop to 2.1 V
• Pin 5 (R/W): Read/Write Pin for Data Read/Write Control. 0.3
• Pin 6 (E): Enable Pin for LCD Controller.3.270V
• Pin 7 (D0-D7): Data Pins for 8-bit Data Bus.3.270V
• Pin 8 (BLA): Backlight Anode Pin.3.28V
• Pin 9 (BLK): Backlight Cathode Pin. 2.211V

[Diah]

at time VDD 2.65V and at D0 D7 3.270 & E the same.. it tell yours MB complete shorted, in this case replacement MB the easy way to avoid headache.

[bohaboha]

[QUOTE=Diah;n3624269]at time VDD 2.65V and at D0 D7 3.270 & E the same.. it tell yours MB complete shorted, in this case replacement MB the easy way to avoid headache.[

Thank you Diah this TV is not worth spending money on it, while waiting for my Mainbord for Samsung UE70TU6905 by the way a 58 inches the coming one (on other thread) I will continue to find if possible the short maybe I will learn something thanks again