good morning to all, I'm going crazy, a lg 39lb561v the backlight emmette a flash for 1 second and then dark, the pcb power EAX65423701. I checked the following voltages on pins 12 v 24 v and 3.5 v are present pwr on-3.5 v and dvron - 3.1v on the output pins of the led I 0v! What can I check? the capacitor next to the LED connector measures 108v
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Re: LG 39LB561V flash backlighting
You need to upload good clear straight shot of the whole back side of the TV showing all the boards, and the pictures of the whole power supply LED driver board.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: LG 39LB561V flash backlighting
Probably backlighting issues. One goes out, you see the outcome as system tries to energize but balancing off.
I could pull a 39" panel in my sleep. Check out the backlights.Did I leave the soldering iron on?Comment
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Re: LG 39LB561V flash backlighting
here they are!Attached FilesComment
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Re: LG 39LB561V flash backlighting
I tried to give them 100v voltage in DC taken directly from the capacitor alongside, the result is the same! I have the dead led?Comment
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Re: LG 39LB561V flash backlighting
If you turn off the TV and remove the LED connector then leave the meter (set the meter scale so it can read higher than 200VDC) probes on the two legs of that cap C801 (33uF 350VDC) then turn on the TV while keeping an eye on the meter, you should see the Voltage go up much higher than 200V and then it should go down to 108V (this is the feeding Voltage to the Boost converter).
More likely that you have shorted out LEDs that is why you see the backlights flash on for seconds and then go black due to over current shutdown.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: LG 39LB561V flash backlighting
I removed the panel, and I found a dead LED, I will try to replace that. attached photoAttached FilesComment
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Re: LG 39LB561V flash backlighting
I have found with LGs that after LEDs replacement you would need to turn down the backlight level to 60%. However, I've had some callbacks even though backlight was adjusted to 60%. The final and outcome for me is that all the strips should be replaced and that seems to hold out, so far.Comment
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Re: LG 39LB561V flash backlighting
I reassembled the panel, but now I have this! what did I do? Did I mess up?Attached FilesComment
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Re: LG 39LB561V flash backlighting
do you get any image on the lower half ?Samsung UE46D6530
Samsung BD-F7500
Samsung HT-ES6200Comment
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Re: LG 39LB561V flash backlighting
yes but it is not aligned with the rest of the imageComment
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Re: LG 39LB561V flash backlighting
I ruined the panel according to you? and yet the removed and reassembled with extreme care and precision, the only stupid thing I have done is to connect the flat ldvs with the power plug inserted. I throw it away or can it be that in short the t-con?Last edited by Moddingscreen; 01-22-2018, 10:00 AM.Comment
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Re: LG 39LB561V flash backlighting
can nobody help me?Comment
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Re: LG 39LB561V flash backlighting
Does sympathy help? I killed my first 50" LG LED last week. Did it differently and bolted the boards and power supply back on before the panel. Somehow I had a discharge through me, into the case whilst holding the top right corner of the panel.
I now have no display, diconnected righ Tcon ribbon anleft came on perfect. Looks like I spiked the right half of th epanel.
For you, I can take a guess due to my LCD inexperince but thos little ribbons/tabs on the right and left sides that are taped to the chassis.. any of those damaged or cut?
They looked like terminations to me .Comment
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Re: LG 39LB561V flash backlighting
I had also thought about those tapes, but they are perfect they have no cut or malformationComment
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Hello, I'm stuck in troubleshooting…
The flash system works like that : when the (mechanic) flash button is pressed, the flash mecanically pop up, and a circuit buck boost elevate 7v (batt) to 200-300v (?) for charging the big capacitor. And when the photo shoot button is pressed, the capacitor is discharged in the xeon light.
In the D800, there is a first « power board » close to the battery. 2 wires (batt 7v) goes to another little « flash board ». I measured 7v, so ok.
When I press the flash button, it's detected by the system, flash icon appear on LDC display.... -
Hello I've had somebody bring in one of these charming little cameras to attempt retrieving data from the internal 32GB flash.
Something is damaged inside the cameras lens assembly I can hear it clunking around and it has probably dislodged the sensor, powering up the camera gives a blank screen and the focus motor sounds like it's having a fit.
The camera will not connect to a computer via USB in this state, I have no options no navigation, just power up and focus/zoom motor noises.
I think my best shot is to figure out a way to read the internal flash memory outside... -
HI guys
I got here a Sony 65X950G - I tried to find any repairs guides for this model but not many online
here is the issue
I have Sony and android logo. but then 4 led red flash lights front of the tv
I have 3.3v ref. 12v reg then T con 12v when I press the power on button
but then I get black screen and 4 red flash light at the front LED
but I get 3 led flash on the LED driver board.
I check that few X900F or C YouTube repairs, seems that if you have 4 led red flash it could be due of LED black light error
so I tried... -
Good evening,
I need help with dissassembling my USB Flash Drive (ADATA C008 / 16GB), the problem is that I don't know how to approach this USB Flash Drive dissassembly without damaging the USB Flash Drive itself....11-10-2024, 10:55 AM -
Hello, I search this connector (oxydated).
It's a fpc zif low profile connector. It come from camera sensor, it is very small : 0.3mm between 2 pins.
I ordered 2 from Aliexpress called « 0.3mm pitch » but one was 0.5mm between 2 pins and the other 0.6mm. In fact « 0.3mm pitch » seams to be the pad width and not the distance between 2 pins.
I can't find it. The other websites like mouser dont show the datasheet, and I can't check if it is 0.3mm between 2 pins ?
Do you know how to find this connector please ? What is the exact name for find it ?
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