Re: LCD panel sources
You can try tape cutoff method for horizontal lines.
[url]https://techhometravel.com/repair-of-flickering-double-image-horizontal-lines-on-a-tv/[/url]Re: LCD panel sources<br />
<br />
...on-a-tv/[/url]
neilc6
Badcaps Legend
Last Activity: 01-26-2023, 07:48 PM
Joined: 11-21-2015
Location: BC
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Re: Samsung UE40J5100AK Bad Picture
Orangey image is bad panel. Connect one side of tcon at a time to see if one side is good. If it has side tabs, rip them off the bad side.Leave a comment:
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Re: Lg49uh620v
Backlight issues are 99% the backlights themselves and rarely the power supply in LGs. LEDs will wear and burn out just like light bulbs. On UH series, error can cause the TV to shut down.Leave a comment:
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Re: Hisense LTDN40D36EU thin black vertical line
Static vertical lines are bad panels. Google Sony tcon training manual.Leave a comment:
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Re: Schematic for LG 55UF6450 TV
You are not going to repair a TV main board yourself even with a schematic. Main boards are multi layer with small and fine pitched components like computer motherboards. I am assuming you don't have specialized equipment or skills to do component level repair but asking for a schematic is a sign that you don't. You can ask the seller if he repairs your problem or buy a new main board. These boards usually have bga issues which require reballing. You can try heating the processor with a hair dryer before plugging in.Last edited by neilc6; 12-13-2022, 06:58 AM.Leave a comment:
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Re: Schematic for LG 55UF6450 TV
[url]https://www.ebay.com/itm/113721399641?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=n0VJJ_9SRFi&sssrc=2047675&ssuid=7uxv7pDbTa2&widget_ver=artemis&media=COPY[/url]Re: Schematic for LG 55UF6450 TV<br ...dia=COPY[/url]Leave a comment:
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Re: Toshiba 58L1350UC Backlight.
On Toshibas, bad backlights can damage the power supply and vice versa. So if you install new strips, they can be instantly be damaged again. Do not recommend repairing these models for this reason since you will spend more money trying to repair than the tv is worth.Leave a comment:
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Re: Emerson LF402EM6F NO STANDBY, DEAD SET!!! HOW DO YOU TEST FOR VOLTAGES!!!
These Philips/Emerson sets have weak power supplies. Few threads here.
[url]https://www.badcaps.net/forum/showthread.php?t=72916[/url]
[url]https://www.badcaps.net/forum/showthread.php?t=71919[/url]
If the power supply is squealing with the main connected, likely a shorted chip cap on the supply rail on the main.
[url]https://techhometravel.com/philips-40pfl4908-f7-squealing-doesnt-turn-on/[/url]Re: Emerson LF402EM6F NO STANDBY, DE...!!! HOW DO YOU...Last edited by neilc6; 11-27-2022, 04:58 AM.Leave a comment:
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Re: About replacing individual LEDS on BL strips
LEDs wear and burn out just like light bulbs and it is recommended to replace all the LEDs with new instead of individual replacement. New strips are relatively inexpensive these days. If I can't find new strips or if they are too costly, I will do an individual replacement and turn down the backlight level. LEDs typically fail short circuit and in models with shutdown protection, the decreased sense voltage will trigger protection shut down on the LED controller.Leave a comment:
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Re: Haier LE39F32800 No Backlights PFC Not Boosting
It is difficult to probe the back of the board with it connected for testing.
FB net is tied to the Restart and I can probe pin 3 (collector out) and pin 4(emitter out) of the optoisolator (U206). Emitter is 1.2V in standby and 1.7V on and 0V on pin3 in both states so not turning on.
Comparing to U201 Opto for PFC_VCC, collector pin 3 is 0.4V standby and 20V on so turning on and providing power to PFC IC.
Probing the output to the LED string, one side is 0.4V in standby and the other 0.01V....Last edited by neilc6; 11-01-2022, 12:33 PM.Leave a comment:
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Re: Haier LE39F32800 No Backlights PFC Not Boosting
I checked all the power resistors (some hidden under the heatsinks) and none are open circuit. I have a 300mA LED tester and the strips all lit up with no fluctuating voltages. TV menu showed the TV set to Energy Savings picture mode which runs at reduced current.Leave a comment:
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Haier LE39F32800 No Backlights PFC Not Boosting
Tore down this TV to find that all the backlights were working so part of the 1% of cases where there is a bad power supply. I confirmed the TV was producing video by powering the backlight with my LED tester and turning it on. All voltages were good (V STB, 12V) other than zero readings going to the backlight.
Found a schematic and the PFC is only used by the backlight controller. Confirmed the BL-ON signal is turning on the optoisolator to enable VCC (20VDC) to the PFC IC FAN7930. PFC cap reads 180VDC in standby and the same when turned on so not boosting. Checked all power diodes...Last edited by neilc6; 10-31-2022, 05:44 PM. -
Re: LG 55LA6200 Back light strips
If the substitute lenses aren't a good match, they will not diffuse properly. Found this problem on a 42 LB set and trying a different seller. You can confirm by reinstalling an old strip if all the leds are working and the lenses are still attached.Leave a comment:
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Re: LG 55LN5700 reboots
LN series suffers from backlight failures but they just shut down into protection mode since no error signal is sent to the main board. TV will be on with no backlight. If your supply voltages are stable, main board is suspect. Have not encountered BGA issues on this model either.Last edited by neilc6; 10-30-2022, 04:54 PM.Leave a comment:
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Re: Samsung UN55J6200AFXZA Sound but no Picture
Samsungs don't have protection shutdown. LEDs will continue to burn out until the screen is too dim, one fails open circuit acting like a fuse or there is damage to the power supply.Leave a comment:
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Re: Samsung UN55J6200AFXZA Sound but no Picture
If you have no backlights, you likely have bad backlights especially in E, H and J model year Samsungs.Leave a comment:
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Re: Post your Samsung NU model series backlight failures and diffuser melt-downs here
Just did a 55NU. Cracked and burnt light spreading panel. Luckily, I salvaged one from a curved 55NU a few weeks ago. The new replacement strips I ordered failed right away. Got a refund and ordered from a different seller for a few bucks more but they looked identical to the ones that failed. Pic 2 & 3 are failed replacement strips. 4 is original burnt out strip....Last edited by neilc6; 10-06-2022, 02:39 PM.Leave a comment:
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Re: Samsung UN60J6200 No power up
Is the TV turning on or turning on with no backlight?
Testing for Samsung TVs
Unplug the cable between the power supply and main board and plug the TV in. The backlights should come on. If they don't, you likely have bad backlights though bad backlights can damage the power supply. If backlights come on and TV doesn't turn on with the main board connected, the main board is suspect.
2.Connect one ribbon cable at a time between the tcon and panel and see if one side displays a good image. If one side is bad,...Leave a comment:
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Re: Samsung UN46H203AF Bad Backlights and Bad Power Supply
Unlike every other manufacturer, Samsungs don't have protection shutdown in their LED driver circuit. LEDs will burn out until the screen gets too dim, there is damage to the power supply, or one LED goes open circuit acting like a fuse. Strip prices are relatively inexpensive ordering from Aliexpress....Last edited by neilc6; 09-21-2022, 02:52 PM.Leave a comment:
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Re: LG 65UJ6200 4K Smart TV Backlight Issue
Backlight issues are 99% the backlights themselves. LGs have shutdown protection if the sensed voltage is out of range. You can lower the backlight level for now to see if it stays on longer but proper repair is to replace all the strips with new.Leave a comment:
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