sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

**frankriz99** · 03-24-2018, 06:13 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

Also i thought 12V was the trigger to kick on the inverter boards not TCON but i could be wrong
IC5702 is KIA 378R12PI

other pinout on psu board connect small one is as follows

PD cn5703

PS_ON pin 1 2.91v
AC_DET pin2 3,3v
GND pin3 0V
PNL_POW pin4 0V
BU5V pin5 4.98v
GND pin6 0v

also on main board 4pin connector that goes to inverter to trigger on has no voltage, but i suspect this is due to Main board not racing 12V power on

**CapLeaker** · 03-24-2018, 06:23 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

If you force the PSU on, are all power rails o.k.?

**frankriz99** · 03-24-2018, 06:52 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

do you mean by shorting PS_ON and AC_DET

**frankriz99** · 03-24-2018, 06:58 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

Or PS_ON to GND

**nomoresonys** · 03-24-2018, 07:10 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

Originally posted by frankriz99

Or PS_ON to GND

That one.

**nomoresonys** · 03-24-2018, 07:11 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

Jump ps_on to ground, then see if you have the expected voltages.

**nomoresonys** · 03-24-2018, 07:16 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

https://www.youtube.com/watch?v=mUvclBfaMXg Video demonstrating procedure.

**nomoresonys** · 03-24-2018, 07:22 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

You don't have to remove the board tho, just disconnect all the other boards.

**frankriz99** · 03-24-2018, 07:43 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

ok took whole new PSU out of tv and put it on the bench shorted PS_ON to ground.

PSU became active here are my voltage (note 12V still not there)

13.45v
13.45v
0V
0V
10.21v
10.21v
0v
0v
0v -should be 12V
0v - should be 12V
0V
5.99V

**CapLeaker** · 03-24-2018, 08:17 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

you always need put the pin out name with the voltages measured. Is there a BL_on?

**frankriz99** · 03-24-2018, 08:56 AM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

CN5702

13.45v pin 12 AMP_13v
13.45v pin 11 AMP_13v
0V Pin 10 GND
0V Pin 9 GND
10.21v pin 8 10V
10.21v pin 7 10V
0v pin6 GND
0v pin5 GND
0v pin4 PNL 12V (-should be 12V)
0V pin3 PNL 12V (-should be 12V)
0V pin 2 GND
5.99V pin1 6V

CN5703

Pin1 PS_ON 2.91V
Pin 2 AC_DET 3.29V
Pin3 GND 0V
pin 4 PNL_POW 0V
pin 5 BU5V 4.98V
pin 6 GND 0V

also i notice on main board (not PSU) there are 2 solid RED led on, and one constantly flashing red led

**nomoresonys** · 03-24-2018, 01:25 PM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

Looks like it may be right, does not look like you activated bl_on, right? you just jumpered ps_on and ground if that's correct theory then it looks like the powersupply is ok.

**nomoresonys** · 03-24-2018, 01:32 PM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

http://www.shopjimmy.com/sharp-rdenc...pply-board.htm pic. of powersupply if that's it.

**budm** · 03-24-2018, 02:37 PM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

'pin 4 PNL_POW 0V' Main board is not sending the control signal to run on PNL12V which is supplied by the switched 12V LDO IC5702 KIA 378R12PI.

**budm** · 03-24-2018, 02:41 PM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

Originally posted by frankriz99

CN5702

13.45v pin 12 AMP_13v
13.45v pin 11 AMP_13v
0V Pin 10 GND
0V Pin 9 GND
10.21v pin 8 10V
10.21v pin 7 10V
0v pin6 GND
0v pin5 GND
0v pin4 PNL 12V (-should be 12V)
0V pin3 PNL 12V (-should be 12V)
0V pin 2 GND
5.99V pin1 6V

CN5703

Pin1 PS_ON 2.91V
Pin 2 AC_DET 3.29V
Pin3 GND 0V
pin 4 PNL_POW 0V
pin 5 BU5V 4.98V
pin 6 GND 0V

also i notice on main board (not PSU) there are 2 solid RED led on, and one constantly flashing red led

Are these Voltage you are showing are done with all the connectors back in place? Or it's done with PS-ON pin connected to GND which then doe not make sense since you still show PS-ON 2.91V. Please clarify.
It looks to me the PS-ON has to be high for the rest of the power supply to be turned on based on your Voltage readings.

**budm** · 03-24-2018, 02:45 PM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

BTW, we still need to upload pictures of the whole backside of the TV showing all the boards, the other thread you made the Photobucket had blocked your pictures.

**frankriz99** · 03-24-2018, 05:00 PM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

is there anyway to assert the PNL_PWR to see if inverter will fire up.

**petehall347** · 03-24-2018, 05:10 PM

Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

photobucket wont work without browser extension .
try uploading here or a different place than photobucket