Hi guys; i found this tv out in the curve and it probably stayed out in the rain a few hours or even days,i got it home and used a Fan and a heat blower to dry it,i did power it up and first thing i had a blue screen with menu which was good news,screen was good,then plugged video sources and on all video sources had synchronize issues,see video pic;
then i blew hot air with heat gun towards the BGA and synchronize issue got worse,then i blew cold air with the fan and video got stable and now i have good video on all sources,i don't know how long before it goes bad again,!
what you guys think i should do?,i'm thinking of doing the same i did to my Vizio M42Vt that had scrambled pic by doing this see utube link:and installed a computer cooling fan blowing air to the BGA.

this is the sync issues before i used blowing cooling air to the BGA

https://postimg.org/image/fgl6nsett/

 

Looks like Chelsea and City.....

If it works better when cooled, then it must be taking too much current, do as the video suggested and put better heatsink compound and a fan on it.

 

Looks like Chelsea and City.....

If it works better when cooled, then it must be taking too much current, do as the video suggested and put better heatsink compound and a fan on it.

thanks i used a heat gun and heat up the BGA as i did in my other Vizio tv and it's working great now,i want to install a 5 or 12 v cooling fan,is it possible to take out of the power supply these voltages?

 

Yes i would use the 12V supply.

 

Yes i would use the 12V supply.

Thanks Dodgydave;it would be nice if i could find switched 5v or 12 v DC on the power supply so when tv turns off tv the fan would too,but i can't find those 12 or 5 v switched points on the power supply


http://www.shopjimmy.com/megmeet-mlt666t-power-supply-unit.htm

 

The link doesn't work,, What is the number of IC2?, looks like the mains comes in at the bottom and the DC outputs at the top!

 

The link doesn't work,, What is the number of IC2?, looks like the mains comes in at the bottom and the DC outputs at the top!

Thanks Dodgydave;it would be nice if i could find switched 5v or 12 v DC on the power supply so when tv turns off tv the fan would too,but i can't find those 12 or 5 v switched points on the power supply


http://www.shopjimmy.com/megmeet-mlt666t-power-supply-unit.htm

 

YOUR LINK DOESN'T WORK!

 

YOUR LINK DOESN'T WORK!

Thanks Dodgydave; ok i just took some pic of my board

IC 2 MC0628R http://dalincom.ru/datasheet/MC0628R-schematic.pdf

 

Hi guys please help here i need your expertizes, i need to install a 12v fan but i want to draw the 12 v from the power supply so when i turn off tv the fan turns off too,can somebody indicate me a point in the circuit where i can connect the 12v,most of the voltage points i tested are active either tv on or off,can someone lead me to the right voltage points.


https://postimg.org/image/4vy45oglr/5a73b171/


https://postimg.org/image/pcnxdi1ub/87a33127/

https://postimg.org/image/hmlio148l/973f9e4a/


https://postimg.org/image/ykpmccbrx/2b125b8a/

 

IC2 will be the main pwm chip, looks like there are three inverter coils giving several separate outputs, can you please take note of the number on IC 2 ??( img 695.jpg)

If this is the only circuit board then the switches must be connected to the sockets on the right side, you will need a Voltmeter to check the outputs for DC right-hand side when switched On and again when Off,

This will give you a rough idea of what's going on..

On your online images (img.3127 second one) there is an Rf output modulator with an Aerial socket, this will be powerd on /off usually with 12V dc..

 

IC2 will be the main pwm chip, looks like there are three inverter coils giving several separate outputs, can you please take note of the number on IC 2 ??( img 695.jpg)

If this is the only circuit board then the switches must be connected to the sockets on the right side, you will need a Voltmeter to check the outputs for DC right-hand side when switched On and again when Off,

This will give you a rough idea of what's going on..

On your online images (img.3127 second one) there is an Rf output modulator with an Aerial socket, this will be powerd on /off usually with 12V dc..

Thanks Dodgydave; IC 2 MC0628R http://dalincom.ru/datasheet/MC0628R-schematic.pdf

 

 

Looks like that switchmode circuit only gives out 24VDC, so your circuit must be giving other voltages out,these will be on all the time,

i would say that the extra pcb connected does the on/off switching, like the aerial modulator...

 

Looks like that switchmode circuit only gives out 24VDC, so your circuit must be giving other voltages out,these will be on all the time,

i would say that the extra pcb connected does the on/off switching, like the aerial modulator...

Thanks you Dodgydave; you mean the extra board is the main board ? well i will connect a external 12v adapter with a switch to the fan,thanks i appreciate you trying to help.

 

No problem.

 

Hi Guys; new update on my Sabre LCT321BKA it's not that at the time it was not working OK but as i was trying to find the 12v to the external fan,i also did a check on some components in the power supply and luckily i did otherwise i would come up with issues,i'm sure this was the cause of the heating BGA issue !, story short i found out all these Caps see attach; were all completely dry,also did have to use my imagination how to put those caps in place without removing the heat sink and i came up with this tool from a pair of clippers,not bad for an amateur,hope this will be a help for anybody with this type of power supply.