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Agreed. The tester only supplies a limited current into the backlights. Some backlights will only fail under full current from their proper LED driver circuit.
You could also check for a voltage spike at the LED output plug on the power supply as you turn the TV on....
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Re: The infamous Sony Android Reboot problem
Mohammed at Microtech fixes the boards for around £90 I think.
I've got three of these Android Sony's all with various problems relating to the main board. Sony should really have recalled them or extended the warranty for these issues. These TVs were priced at way over £1000 and they're only lasting 2 or 3 years.
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Re: Lg 42lb5610
I've had 2 LG models with similar issues. Both of them had the exact same thin black horizontal lines but these were on permanently and all over the screen. More prominent at the top but faded slightly as they went down. I tried replacement tcon and main board but the fault still remained. I put it down to a cof or tab bonding problem in the end.
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Re: LG 6V LED Backlights
No these are definitely 6v Neil. If I divide the drive voltage by number of LEDS it comes out at 5 point something. I've done dozens of the 3v ones as well and the strips, leds and lenses are easy to differentiate between.
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Re: LG 6V LED Backlights
Thanks Neil, but if you're working on one strip with all lenses removed (or fallen off), these replacement LEDs are noticeably brighter before fixing any of the lenses into place. They're easily twice as bright as the surrounding original ones.
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LG 6V LED Backlights
I've been repairing quite a few LG tvs with the usual backlight problems over the past few months. I'm talking about replacing individual leds rather than fitting new strips.
The 3v types are fine, but does anyone else have a problem with bright spots on the screen after replacing the 6v type? This is the type with the thick round lens that also falls off with the slightest touch.
The type of replacement LED I'm using is a 2 watt 3535 6v, which is the most common one on eBay advertised for use with these LG models. At first I was thinking that they just seemed brighter in...
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Re: Hitachi 32HXC01U - No Text in Menus
Thank you very much kind sir, the TV is now working perfectly.
Very much appreciated!...
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Hitachi 32HXC01U - No Text in Menus
I obtained this TV with a backlight problem which I've fixed, only to find out that although the TV works fine, all menus are blank with no text.
The background for the menu comes up with blank text boxes, and you can navigate these boxes with the remote, and I even managed to tune the TV in so the menu's do work, it's just that there's no text in them.
Is there a way to factory reset the TV? I've tried menu 4725 but the TV just restarts when I do this. Any help greatly appreciated!
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Re: Help Diagnosing Backlight Voltages (JVC LT-50C550)
Update....
Decided to dismantle to screen to check the LEDS and managed to tear one of the tab bonds by accident... TV is now junk.
Just for the record though I went ahead and tested the strips, and every single one of them had at least 1 led not lighting up, some had as much as 4 or 5 failed leds
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Re: Help Diagnosing Backlight Voltages (JVC LT-50C550)
Brilliant, thanks Neil, so does that mean with each of my strings boosting to 138v, then settling back to 95v that my power supply is working correctly and I have an open or short circuit LED?
I usually just see no backlight and go straight for opening the screen and testing the led strips, but I'm trying to be a bit more methodical about it.
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Help Diagnosing Backlight Voltages (JVC LT-50C550)
Wondering if anyone can help me understand the diagnostic process when deciding if the backlight supply is faulty or the backlights themselves.
This is a JVC LT-50C550 which uses a TV5001-ZC02-01 power supply. The symptoms are just a brief flash of backlights at switch on.
Voltages at switch on both white wires (to chassis ground) spike at 138v then settle down to 95v. Voltage on both red wires (to ground) are 45v.
Strangely there is zero volts when measuring between white & red wires on either or both pairs. Can anyone give me an idea what's going...
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Sharp 32HG5141K (TP.MS6486.PB710) Component ID
Hi, I have a Sharp 32HG5141K which uses a TP.MS6486.PB710 board.
The problem was a blown fuse plus 2 shorted bridge rectifier diodes, plus I also noticed the ceramic cap CB120 is blown. Can anyone tell me what value this is?
Alsi are there likely to be any more damage?
Many thanks...
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Re: Sharp 32CHF5111K (TP.MS3463S.PB711) Fault
Thanks. I managed to get one from EMOS (big UK supplier of used parts). It was advertised for £35 buy-it-now, but I sent an offer of £20 along with a note saying it's just a basic 32" TV and that would be my maximum offer. They accepted 20 mins later. That should be the problem solved, just a pity we weren't able to get down to component level repair on the original board.
Thanks for everyone's input though. Have a nice weekend guys....
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Re: Sharp 32CHF5111K (TP.MS3463S.PB711) Fault
Morning R.J., yeah it's a big nand chip on the underside of the board, I tried giving it a freeze as well but still no results.
I may just have to buy a replacement board for this TV I'm guessing, although I'm not sure if it's worth the cost given that it's a basic model with no smart functions....
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Re: Sharp 32CHF5111K (TP.MS3463S.PB711) Fault
Ah ok lol. The nand must be on the underside of the board. Will check tomorrow. If it’s an spi 8 pin flash I can change it but a nand chip is beyond my soldering skills ☹️
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