Sharp LC-60LE832U

[RickSinGA]

System will not power up. Has worked flawlessly since new (4 or 5 years; best guess), went to turn it on yesterday and noticed the long blink/quick blink of the power indicator. Tried all of the tips in related threads and never got any response from the TV.

Will add that there was a brown out earlier that morning and the power dimed several times in a row. TV was not on and nothing else seemed to show any problems. Did not have to reset clocks etc.

Okay, will get pics and post. No voltage checks yet, will need to get a good voltmeter.

Thanks
Rick S.

[RickSinGA]

Re: Sharp LC-60LE832U

Here are the boards.

[RickSinGA]

Re: Sharp LC-60LE832U

Anyone? Direction?

[dskall]

Re: Sharp LC-60LE832U

Need voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
Format:
Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.

[RickSinGA]

Re: Sharp LC-60LE832U

"I assume no responsibility for any stupid suggestions I might post. "

As long as you hold me harmless for stupid questions.

[dskall]

Re: Sharp LC-60LE832U

No promises

[RickSinGA]

Re: Sharp LC-60LE832U

Okay, went out and bought a new multi-meter because I thought my old one was bad. Same results. Pin #9 is the only pin with any voltage at all and it is 5.08.

[R_J]

Re: Sharp LC-60LE832U

What is the actual blink code Long blink/quick blink means nothing
Should be slow flash, 1,2,3 or 4 times followed by fast 1,2,3,4 or 5

[dskall]

Re: Sharp LC-60LE832U

Still need in format of post 4

[RickSinGA]

Re: Sharp LC-60LE832U

Blink code is 1 long and 1 short.
The only pin with power was 15 not 5.
Got the pin labels from the board.

Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
1 - PNL 12v - 000v - ???v
2 - PNL 12v - 000v - ???v
3 - GND - 000v - ???v
4 - GND - 000v - ???v
5 - S13.2v - 000v - ???v
6 - S13.2v - 000v - ???v
7 - UR13.2v - 000v - ???v
8 - UR13.2v - 000v - ???v
9 - GND - 000v - ???v
10 - GND - 000v - ???v
11 - GND - 000v - ???v
12 - GND - 000v - ???v
13 - AC-DET - 000v - ???v
14 - PS-ON - 000v - ???v
15 - BU5v - 5.08v - ???v
16 - PNL-POW - 000v - ???v
17 - PWM1 - 000v - ???v
18 - NC - 000v - ???v
19 - DIMMER - 000v - ???v
20 - NC - 000v - ???v
21 - NC - 000v - ???v
22 - ERROR - 000v - ???v
23 - PWM2 - 000v - ???v
24 - STB - 000v - ???v

[dskall]

Re: Sharp LC-60LE832U

With main board cable disconnected use 1k resistor jump from pin 15 to pin 14. See what you get for voltages.

[RickSinGA]

Re: Sharp LC-60LE832U

Humm, you just jumped over my capabilities I think.

Where would I find a 1k resister? Would that be a 1,000ohm?

[truep]

Re: Sharp LC-60LE832U

yes, 1k=1000

[budm]

Re: Sharp LC-60LE832U

Any value between 470 ~1000 Ohms will be fine.
BTW: 13 - AC-DET - 000v
That should be areound 3VDC or so for normal condition, it can be due to bad OPTO or the resistors on the LED side of the OPTO.

[RickSinGA]

Re: Sharp LC-60LE832U

Here comes one of those "stupid questions".

With no apparent voltage output from the power board would replacing the power board likely resolve the issue or are there likely underlying issues?

[jetadm123]

Re: Sharp LC-60LE832U

Here comes one of those "stupid questions".

With no apparent voltage output from the power board would replacing the power board likely resolve the issue or are there likely underlying issues?

Did you perform the 1k resistor test? Testing is a way to help make correct decisions. Otherwise, you're just going wind up swapping boards with no guarantee of success. If you still have a Radio Shack open or any other electronics store in your area, then you should be able to get a resistor through them.

[RickSinGA]

Re: Sharp LC-60LE832U

I believe they closed some time ago. Will have to take a trip to the city (Chattanooga) over the weekend.

I understand that I should unplug everything from the PB for this test? If so I can use the 24 pin cord and poke the ends of the resistor into the other end in the appropriate plug terminals, right?

Will get back to you.

Thanks
Rick S.

[jetadm123]

Re: Sharp LC-60LE832U

If you have any old electronics around, you might be able to pull a resistor out of it. The value can be anywhere from 470 to 1k ohm. As dskall said, unplug the mainboard and insert the resistor in appropriate plug holes.

[RickSinGA]

Re: Sharp LC-60LE832U

With PB disconnected from system and a
1k Resistor jumping 14 and 15

Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
1 - PNL 12v - 2.4mv - ???v
2 - PNL 12v - 1.3mv - ???v
3 - GND - 000v - ???v
4 - GND - 000v - ???v
5 - S13.2v - 2.3mv - ???v
6 - S13.2v - 13.06v - ???v
7 - UR13.2v - 4.1v - ???v
8 - UR13.2v - 13.06v - ???v
9 - GND - 5.08v - ???v
10 - GND - 0.3mv - ???v
11 - GND - 3.34v - ???v
12 - GND - 0.3mv - ???v
13 - AC-DET - 0.2mv - ???v
14 - PS-ON - 4.68v - ???v
15 - BU5v - 0.2mv - ???v
16 - PNL-POW - **mv - ???v
17 - PWM1 - 13.06v - ???v
18 - NC - 000v - ???v
19 - DIMMER - 13.06v - ???v
20 - NC - 000v - ???v
21 - NC - 000v - ???v
22 - ERROR - 2.3mv - ???v
23 - PWM2 - **mv - ???v
24 - STB - 2.3mv - ???v

** meter just keeps climbing slowly

[dick_barton]

Re: Sharp LC-60LE832U

If pins 5 & 6 are connected together then both should both read 13.06V
If Pins 7 & 8 are connected together then they should both read 13.06V
If Pin 9 is Ground then it cannot read 5.08V
I think there is something very wrong with the above readout table.

Are you certain you have connected BU5V to PS_ON using a 1K resistor and mainboard disconnected?

Was your meter set to DC volts?