Sharp LC-40D68UT dead
This TV has no 5V. It went to another shop before it came to me.I can see where someone may have changed the 5V regulator. I checked the datasheet but the configuration doesn't make sense to me. Can anyone tell me the part number for IC721?
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Re: Sharp LC-40D68UT dead
How about upload good clear pictures of the boards, the parts that were replaced, etc. so we can see what we are dealing with?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-40D68UT dead
Here are a couple photos and a datasheet of the 5V regulator. The power supply is a LC0919-4001ac. I'm just trying to verify if the regulator is the original one that should be there. As you can see pins 1 to 4 are all shorted to ground. I could be wrong but I don't expect this particular IC to work here, you can see it was installed by someone.Attached FilesComment
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Re: Sharp LC-40D68UT dead
Do you really expect me to use those pictures to do long distant troubleshooting?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=24809Comment
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Re: Sharp LC-40D68UT dead
Borrowed a usb microscope. Hope this helps.I just want to know if this IC n1337 can work in this configuration, pins 1 to 4 shorted to ground.Attached FilesComment
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Re: Sharp LC-40D68UT dead
If it is SMPS IC NCP1337, then what is shown in the pictures will not work.
Without good clear pictures of the whole top side and the bottom side of the board it will be real difficult to help you.Last edited by budm; 02-10-2016, 11:21 AM.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=24809Comment
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Re: Sharp LC-40D68UT dead
There is IC for driving that STANDBY POWER Transformer, unless someone intentionally put solder bridge on that IC. I cannot tel what is going on until I get to see good clear pictures of the bottom side of the board.
Pictures provided by shopjimmy.
My suggestion is to remove that IC so you can see all the pads on the circuit board.Attached FilesLast edited by budm; 02-10-2016, 11:33 AM.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=24809Comment
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My 12y old daughters tv (that she got after her grandpa, has sentimental value to her) was just dead without stby light a couple of weeks ago.
I´ve repaired a couple of computer monitors, classic blown capacitor replacements, a 55" Sammy led with t-connboard replacement and a 42" Panasonic edge led where I replaced the led-strip.
Not a master with the multimeter, which is cheap and 10-15year old btw...
So please make it basic...
To the issue at hand.
As stated, the tv is totally dead with no standby light.... -
plugged in after being off for quite some time. No OPC lights. Tried flashlight test for backlight check, nada.
Pulled the PS and checked all diodes including the 5w(?) D7908 that was the issue last time. All diodes check OK in circuit with DVM diode test.
No caps look unhappy. It is 17 years old. Was gonna fix and give to my brother.
But is there anything else to try or is it likely met its match.?... -
Hello and greetings from the United Kingdom, I'm looking for some help in repairing my grand daughters 'dead' Sharp LC-40FG2241KF smart tv. I have replaced the following damaged parts on the main PCB (TP.MS6486.PB711) :- fuse FB1, switch mode chip UB101, MOSFET QB101,capacitor CB116, resistor RB106, RB148 and a track from UB101 pin 6 to QB102.
Unfortunately resistors RB105 and RB108 are also open circuit and because of their size (0201) I don't know their value. Could some kind soul please tell me or point me toward a schematic with a parts list, a very big ask but for this I would... -
Hi all,
As the title suggests, how can I be sure that my EC chip is really dead?
I've recently gotten into this hobby of laptop repairs, and have successfully brought back to life a couple with some easy fixes, mostly shorted caps.
Now I'm working on HP Probook 455 G8, that had some "devil" run around on 3V line, burning a bunch of stuff. Luckily I have a dead 455G7 (for spare parts) so I managed to fix it (swapped burned parts) to a point that it will charge (both on barrel jack and usb-c), but it doesn't want to turn on. There is a 3V3 on a keyboard... -
hello guys,
i need help to repair a edm-033 ps2
history : as always hdmi port and usb ports destroyed after unplugged
after change them, ps5 dead too : 1 beep, no blue light. after inspection 1.8v power was shorted, and because of dead panasonic chip. after remove it : no short anymore
so i changed it
now i have got 5v stby,, 3.3v stby, 3.3v power, 1.8v power and no short on them
but the ps5 is dead again : 1 beep, near 10 seconds with power lines and then off, no blue light ...
i don't see any projection of liquid metal on pcb.
...
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