Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

leave it.... do the following to force the tv power on and reset fault in case there are error at BL

remove all jumpers.. and plug every things as original. plug the tv out from wall socket.

While holding down the “VOL (-)” and “CH ( - /down)” keys on the set at once, plug in the AC power cord to turn on the power.
After a central icon flash off, separate the fingers from key on the set.
Then, you can check the operation to see if the lamp and lamp circuit are in trouble.
If you fail boot-up, retry the procedure.

page 44 service manual

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

locate the SPI Flash on MB and at standby messure if it had 3.3V on it... write the Lable no of it over here.

EDIT:
could be this one

If this is the IC - T64 2524, how do I measure the 3.3V?

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

Sound advice, thank I guess I will take it one step at a time, sourcing for new MB first and deal with BL issue if it come.

Any last attempt can be done on this old MB?

locate the SPI Flash on MB and at standby messure if it had 3.3V on it... write the Lable no of it over here.

EDIT:
could be this one

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

this why i said stop working on PCB. because you will damage it... bring the TV on and can hear sound then LED easy to repair if they need. 70 size TV its hard to read if some one damage it more.

Sound advice, thank I guess I will take it one step at a time, sourcing for new MB first and deal with BL issue if it come.

Any last attempt can be done on this old MB?

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

Cool man, I am newbie in TV also I have attempted a few repair..
I appreciate all the guidance you have given. Yes, I have taken your word that the MB is busted and will need to source one.
I also want to be certain that backlight of PS is good too. BL is not on, I think it is worth investigating before buy a new MB right?

this why i said stop working on PCB. because you will damage it... bring the TV on and can hear sound then LED easy to repair if they need. 70 size TV its hard to read if some one damage it more.

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

Jumped PD-15 to PD-14; and PD-16, PD-19, and PD-21, each with a 800ohm resistor:

BTW here are your mistake
Dimm when it low mean LED ON. if dim go high mean cutoff.
SPI= eeprom SPI Flash

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

men... you are really funny... who care on BL if they come on or not when the MB dead.

did you know which pin BL_ON ?? we tested panel 12V. and main 13V are good mean PCB 100% working
what the diffrent if man his legs brocken and you insist to teach him dancing !!!!

Cool man, I am newbie in TV also I have attempted a few repair..
I appreciate all the guidance you have given. Yes, I have taken your word that the MB is busted and will need to source one.
I also want to be certain that backlight of PS is good too. BL is not on, I think it is worth investigating before buy a new MB right?

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

men... you are really funny... who care on BL if they come on or not when the MB dead.

did you know which pin BL_ON ?? we tested panel 12V. and main 13V are good mean PCB 100% working
what the diffrent if man his legs brocken and you insist to teach him dancing !!!!

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

what happened? beer break?

Black probe on big cap negative, red on middle pin of Q7700 - 402VDC
Black probe on big cap negative, red on either pin of Q7700 - 0VDC

Repeated a few times..

How does this Q7700 works?

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

what happened? beer break?

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

make sure your meter is set to at least 200 if it isn't an auto range meter.

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

test q7700 again, put black probe on neg. of big cap and red probe on each leg of that fet.

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

wondering why the backlights didn't come on when powerboard is jumped, sure seems like they should.

There is no power supply to those 2 transformers, because Q7700 is either faulty or not triggered?

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

I am not getting any voltages on those 2 transformers. And you're right, after tracing the 400Vdc from the big caps to the component Q7700, and 0v output to the transformer.

I tested this transistor:
1) Red probe on middle pin:
Black probe on either pin - Open

2) Black probe on middle pin:
Red probe on left pin: 528
Red probe on right pin: 732

Does it sounds bad or OK?

.

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

wondering why the backlights didn't come on when powerboard is jumped, sure seems like they should.

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

power boards are fine...
yours problem at MB, didn't send PS_ON... could be the MB toasted / dead or the SW or too the SPI flash.
the front LED when it blink its the first boot sequences of the SPI which it didn't complete... try freeze the SPI

I am very convinced MB is completed toasted, since there is any shorts that causing fluctuating voltages like it was initially.

But I also curious about whether the BL is working since it has no power to he BL section of the PS.

From my precedent replying post - does it looks like BL is not working?

Question: What's a SPI ?

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

if you still have no voltage when powered, maybe trace it to where it stops, which seems to be right after the big caps somewhere in that area.

I am not getting any voltages on those 2 transformers. And you're right, after tracing the 400Vdc from the big caps to the component Q7700, and 0v output to the transformer.

I tested this transistor:
1) Red probe on middle pin:
Black probe on either pin - Open

2) Black probe on middle pin:
Red probe on left pin: 528
Red probe on right pin: 732

Does it sounds bad or OK?

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

power boards are fine...
yours problem at MB, didn't send PS_ON... could be the MB tosted / dead or the SW or too the SPI flash.
the front LED when it blink its the first boot sequences of the SPI which it didn't complete... try freeze the SPI

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

if you still have no voltage when powered, maybe trace it to where it stops, which seems to be right after the big caps somewhere in that area.

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

you should be getting voltage on some of those, on hot side you use the negative of one of the big filter caps as ground, so neg. probe on that and pos. probe on what you're checking.