Sharp Lc-70le734u blinking 2 long 5 short

[Charrlie]

Just picked up this sharp tv not too long ago and it started not wanting to start the other day, giving me the notorious 2 long-5 short blink pattern indicating a power issue. I was able to force start it a handful of times (once the tv has fired up it has no issue running for 5+ hours). But now as of yesterday, no matter what I try to do button combination wise, I just receive the same blinking code.


So I busted into it and have done the following:

-Removed the power board and inspected for any bad caps, burn spots etc. Do not see any instances of such

-Disconnected each plug/ribbon on the Tcon one by one, no change.

Few tv specialists pointed me towards the main board being the issue. Any thoughts?

(Also Have not multi metered anything, assuming that is the next logical step)

Any help is appreciated, I'm somewhat mechanically inclined but also in no man's land here 😆

[nomoresonys]

Re: Sharp Lc-70le734u blinking 2 long 5 short

check the solder joints, then test the connector, demo there: https://www.youtube.com/watch?v=XH9GfkGQX1I

[thommyX]

Re: Sharp Lc-70le734u blinking 2 long 5 short

Check

Q7902 HIT667
D7918 SB5200
Q7120 KIA378R12PI
IC7905 STR-A6069H
D7908 P6KE150
R7918 0,22 Ohm

Thomas

[nomoresonys]

Re: Sharp Lc-70le734u blinking 2 long 5 short

yep, probably Q7120 KIA378R12PI.

[Diah]

Re: Sharp Lc-70le734u blinking 2 long 5 short

you need to search here we were dealing with sharp. first and the most important testing power boards als stand alone.. and there was listed too.. when you are sure PSU ok and BL ok no way to check parts.. its time to replace boards.