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

[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

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

[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.

[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

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

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

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

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

Repeated VOL- & CH- procedure several times, no effect - blank screen, and power indicator started green, then flashing red 2x, constantly.

[Diah]

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

Repeated VOL- & CH- procedure several times, no effect - blank screen, and power indicator started green, then flashing red 2x, constantly.

try volume + channel -

[beetle1303]

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

try volume + channel -

Better!!
Vol+ & Chn- turn the power indicator stationary green! After 10-15 seconds, release the buttons, still stationary green but black screen..

Press power button will turn off and turn on the green light, but when it's off there is no red standby light.

Also, when power off from the wall socket, it will turn back to 2x flashing red light.

[Diah]

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

Better!!
Vol+ & Chn- turn the power indicator stationary green! After 10-15 seconds, release the buttons, still stationary green but black screen..

Press power button will turn off and turn on the green light, but when it's off there is no red standby light.

Also, when power off from the wall socket, it will turn back to 2x flashing red light.

eeprom OK
CPU main IC no communication to let eeprom confirm to turn on the screen and BL

try input and vloume -

[beetle1303]

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

eeprom OK
CPU main IC no communication to let eeprom confirm to turn on the screen and BL

try input and vloume -

Input & Vol- no effect, same 2x flashing red light.

[Diah]

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

Input & Vol- no effect, same 2x flashing red light.

okay, then with volume+ channel - when you have green LED messure the sockets on PCB which voltage you have on it.

[beetle1303]

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

okay, then with volume+ channel - when you have green LED messure the sockets on PCB which voltage you have on it.

With the PS mounted onto TV, I can only probe the odd pins:
PD-1 (PNL12V) : 0V
PD-3 (SGRN) : 0V
PD-5 (UR13.2V) : 13.05V
PD-7 (UR13.2V) : 13.05V
PD-9 (SGRN) : 0V
PD-11 (SGRN) : 0V
PD-13 (AC_DET) : 3.27V
PD-15 (BU5V) : 4.95V
PD-17 (NC) : 0.04V
PD-19 (DIMMER) : 0V
PD-21 (OFL) : 0V
PD-23 (NC) : 0.04V

[Diah]

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

okay... do this first

unplug the screen ribbon cable from the T-CON and power on normal. see result
keep panel unpluged and use volume - channel - see the result
on both we are interset on BL if it come on. and PNL_12 had 12V.
if all didnt help do this
put every things back and use input and volume + see the result

if all didnt bring different... time to use hot air gun to 280° to cook the mediatech chip in case it had BGA issue... or packing your MB in oven for 10 minute in same degree but with out using air flew, just the up and down with out air. when temp reach high put the board inside and dont move it after backing time untill it cool down. good luck

[beetle1303]

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

okay... do this first

unplug the screen ribbon cable from the T-CON and power on normal. see result
keep panel unpluged and use volume - channel - see the result
on both we are interset on BL if it come on. and PNL_12 had 12V.
if all didnt help do this
put every things back and use input and volume + see the result

if all didnt bring different... time to use hot air gun to 280° to cook the mediatech chip in case it had BGA issue... or packing your MB in oven for 10 minute in same degree but with out using air flew, just the up and down with out air. when temp reach high put the board inside and dont move it after backing time untill it cool down. good luck

1) Screen ribbon cable unplugged from T-Con, power on normal - no change flashing 2x red flight
2) While screen ribbon cable unplugged, pressed Vol- & Chn-, powered up: no change flashing 2x red light.

Will do the oven bake tomorrow morning, then redo these various procedures.
Thank you, and good night.

[nomoresonys]

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

well ya got to fix everything that is broken, good main bad power still equals broke tv, there evidently is a problem with the backlights or the powerboard, because he can not force on the backlights.

[nomoresonys]

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

well here's another thread that eludes to a powerboard problem, note he gets the same readings of voltages, yet there is a fault, so you can not be too quick to dismiss the powerboard as the fault: https://www.badcaps.net/forum/showthread.php?t=56629

[nomoresonys]

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

I just have a hard time believing that both boards went out at the same time, that IS very rare.

[Diah]

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

I just have a hard time believing that both boards went out at the same time, that IS very rare.

dear friends.
we did with him standalone test for PCB and we do have all what we need pnl_12 ok main 13V ok. so we dont care on others,, because the threat you linked his MB was able to torn BL and other,, here are some things ells.

i asked him on messure while he had green LED at front and it was as i thought SPI send power on and we do have 13V but panel 12 v. and BL was out.. so if the main CPU ( mediateck) didnt response the SPI will be blind and wiuld never turn PNL_12 or BL on. so here we are.. his MB toasted why i dont know.. but am sure you agree with me.. that we avoid other make other damage to PCB at time we approved it respose to PS_ON... or.....

cheers.