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Sabre LCT321BKA help

 
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silv55




Joined: 26 Mar 2016
Posts: 50
Location: USA


PostLink    Posted: Wed Apr 05, 2017 9:13 pm    Post subject: Sabre LCT321BKA help Reply with quote


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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.

https://www.youtube.com/watch?v=hL9-eKZv_2s

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

https://youtu.be/3KWKMW0mbbs

https://postimg.org/image/fgl6nsett/
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silv55




Joined: 26 Mar 2016
Posts: 50
Location: USA


PostLink    Posted: Fri Apr 07, 2017 4:37 am    Post subject: Sabre LCT321BKA Help Reply with quote

Hi guys i have fixed this tv by using the Heat blower gun on the BGA ,now i'm installing 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/
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Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 23992
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Sat Apr 08, 2017 12:47 am    Post subject: Reply with quote

Right on the edge of the first picture, second post, there's a 12 volt point on one of the connectors at the top edge of the board. Use that.
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silv55




Joined: 26 Mar 2016
Posts: 50
Location: USA


PostLink    Posted: Sat Apr 08, 2017 3:11 am    Post subject: Reply with quote

Curt Palme wrote:
Right on the edge of the first picture, second post, there's a 12 volt point on one of the connectors at the top edge of the board. Use that.



Thanks Curt Palmer the 12V and the 24V are present all times either with tv on standby or tv on,this is a different switch mode power supply,i tested all volts with tv in standby or on and voltages are present all times.
Well i've got a 12v adapter and built a manual switch that i have at hand to turn on and off fan.

Also despite tv was working ok,but to be safe i tested all caps in the output of the switch mode power supply under the heat sink very hard to replace these but i did replace them all with used good old caps that i had in my scrap from tv boards that i find in the curve with just broken screens and all 1000uf and 470uf, 330uf, 100uf,10uf,about ten of them were completely dry,i wonder how could this tv work this way,luckily i tested this otherwise soon i would have lots of issues, thanks.
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Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 23992
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Sat Apr 08, 2017 3:30 am    Post subject: Reply with quote

Just beware that most no name brand TVs are the lowest quality ever, the bad caps don't surprise me at all. Smile If the CPU or related chip is overheating, then you may delay the eventual failure of the board, but hey, give it a shot!
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