Sharp LC-50LB261U won't start
Originally the power supply board had a bad voltage regulator and exploded resistor and showed no signs of life when powered up. With the resistor and voltage regulator replaced, all of the voltages were where they should be according to the service manual. The standby light goes from solid blue to solid red when the power is turned on. Unfortunately the tv will not function beyond the change in standby light. When the set is turned off, the standby light flashes seven times and turns blue. Is there some reset procedure I may be unaware of as the service manual makes no reference to any such thing. Any help will be greatly appreciated.
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Re: Sharp LC-50LB261U won't start
You can start by providing us the pictures of the whole backside of the TV showing all the boards.
What control signals Voltages do you have, I.E. PS-ON, BL-ON, DIM, Err, etc.?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809 -
Re: Sharp LC-50LB261U won't start
The main two layers of the lcd have separated on the left side of the screen. Apparently the adhesive has let go. I've never seen anything like it and I don't know of any way to repair it.Comment
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Re: Sharp LC-50LB261U won't start
Pics ?Comment
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Please help me ID the blown chip and point me where the short might be.
I have a L1085DG that is getting really hot and a blown up standby regulator (I assume, one leg is ground, one leg is 5v standby, the other has 180 Ohms to ground.
The L1085DG is in the front corner of the board. With no standby power I am using a jumper to get the PSU powered on.
Anything I should check first for a short?
Edit: I can look again but I don't think the USB are shorted, on back or the headers. The USB2.0 are powering up my portable monitor, so I don't think... -
Hi,have Sharp 50BL2AE which is not powering, stays on stand by, White control led is permanently on, signal from remote is coming on board as well from power -mutifunctional button on back side. All power voltages seems to be ok. Backlight checked, working..
Any ideas?
Thanks12-10-2024, 01:17 AM -
Hello, I have a Sharp LC- 58Q620U 58" LED 4K TV.
When you initially plug the TV into the 120V outlet, I get the initial standby red LED light. After you press the power button the red LED goes out and no other lights come. There is no backlight flash, nor image on screen. No audio with HDMI source plugged in, nor does my laptop detect another monitor plugged in. T-con board makes a clicking sound with or without LVDS cables hookup or off.
My first thought was that it had a faulty PSU. Reading voltages, I was getting a swinging voltages from the DC output from the... -
This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.
Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today.... -
Hi. I got a Vizio with no power or standby, and won't turn on with remote or button. I checked the voltages on the connector and all read 0.00V or nearly 0(0.050 ON/OFF pin). None of the pins are labeled STB for standby although I do see some 5V pins. Other than the obvious standby led, which isn't coming on, is there a way to check for standby voltage on this PS. I'm trying to see if my problem is the PS or mainboard. Some Vizios I have fixed with no standby led me to think it was the PS but it turned out being the mainboard. Any experience with this set would be greatly appreciated.
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