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Search: Posts Made By: alfatv
Forum: Troubleshooting TVs and Video Sources 06-26-2022, 11:03 AM
Replies: 5
Views: 216
Posted By alfatv
Re: LG 47LN5400 Replacement backlights

Aluminum type is better for heat transfer and can be found pretty much in all of newer TV's
The copper in original is thin layer, the rest is FR4 which is not good heat conductor.
Still aluminum...
Forum: Troubleshooting TVs and Video Sources 06-20-2022, 05:16 PM
Replies: 27
Views: 677
Posted By alfatv
Re: samsung un65nu6900f common problem, digging deeper

I can speculate that 10k is reducing inrush current. Otherwise the current spike is large enough and is detected as fault.
Did you measure VGH on other side of 10k resistor? Is it stable?
I think...
Forum: Troubleshooting TVs and Video Sources 06-11-2022, 03:32 PM
Replies: 27
Views: 807
Posted By alfatv
Re: Is this Samsung UN70NU6070FXZC 70 inch TV worth keeping?

I have same TV with the same problem.
I also couldn't get any decent result with tape, only hop plugging one of LCD cables results in good image.
Need to find out what check fails at startup and...
Forum: Troubleshooting TVs and Video Sources 06-11-2022, 12:19 PM
Replies: 24
Views: 1,835
Posted By alfatv
Forum: Troubleshooting TVs and Video Sources 04-05-2022, 09:07 PM
Replies: 30
Views: 1,689
Posted By alfatv
Re: Samsung ue55nu7096u - no backlight - faulty LEDs?

Unplug connector between power and main board, then power in on. Backlight should turn on if good.
Another way to test LED's is LED tester.
Forum: Troubleshooting TVs and Video Sources 04-05-2022, 08:58 PM
Replies: 8
Views: 342
Posted By alfatv
Re: LG WIFI is turn off

There are no useful apps left, better get firestick
Forum: Troubleshooting TVs and Video Sources 03-18-2022, 06:28 PM
Replies: 4
Views: 466
Posted By alfatv
Re: LG 50lb6100 flashing backlights unsusual fix!

There are 2 sets of strips connected in series. If one of them is open, the second one will flash.
These LEDs and lenses are wearing out badly, installing new strips is a way to go.
Forum: Troubleshooting TVs and Video Sources 03-06-2022, 06:48 PM
Replies: 4
Views: 360
Posted By alfatv
Re: Samsung UN75RU7100FXZA MOSFET replacement?

As you have original datasheet, you can search for replacement by key parameters.
Digikey has a good engine.
Or search the sites of MOSFET manufacturers: STmicro, IRF, Infineon, Onsemi
Forum: Troubleshooting TVs and Video Sources 03-05-2022, 06:24 PM
Replies: 8
Views: 1,041
Posted By alfatv
Re: Haier 65E3550 infinite Color Test Loop

Power button on TV (not remote) worked for me
Forum: Troubleshooting TVs and Video Sources 02-16-2022, 11:41 AM
Replies: 8
Views: 552
Posted By alfatv
Re: SAMSUNG UN70TU7000F no image

Looks like panel issue, you can try scotch tape on the jumper cable between panel boards.
Forum: Troubleshooting TVs and Video Sources 02-12-2022, 06:09 PM
Replies: 17
Views: 893
Posted By alfatv
Re: Samsung panel help

You can swap all boards and see if it works. For backlight you may need to use original power board.
Forum: Troubleshooting TVs and Video Sources 02-12-2022, 02:26 PM
Replies: 17
Views: 893
Posted By alfatv
Re: Samsung panel help

One is 3D, another is curved, very unlikely.
Forum: Troubleshooting TVs and Video Sources 02-05-2022, 01:55 PM
Replies: 18
Views: 834
Posted By alfatv
Re: RCA Virtuoso RHOS581SM-D Picture Fault

Main and T-con are not matching each other for some reason. Could be corrupted setting or some hardware problem. Search google or this forum for service menu, there are few combinations for RCAs.
Forum: Troubleshooting TVs and Video Sources 02-01-2022, 12:05 AM
Replies: 6
Views: 298
Posted By alfatv
Re: Samsung UA55KU6500 where is panel calibration stored?

You can do calibration by yourself if that really matters.
Find test images, google "monitor test" or similar.
Check black and white levels, also gradient.
If you see any tint, then you can...
Forum: Troubleshooting TVs and Video Sources 01-30-2022, 01:48 PM
Replies: 4
Views: 574
Posted By alfatv
Re: LG 55UH850V LED TV Backlights. Buy used or non genuine

You can use bathroom handle with suction cups or automotive type suction cups, you should be able to find them locally.
Some people don't use any suction cups at all, just grabbing screen with bare...
Forum: Troubleshooting TVs and Video Sources 01-28-2022, 07:16 PM
Replies: 2
Views: 323
Posted By alfatv
Re: LG 55LB630v picture problem

Could be, but some history could help too
Forum: Troubleshooting TVs and Video Sources 01-22-2022, 06:31 PM
Replies: 4
Views: 341
Posted By alfatv
Re: Help with identifying missing resistor from JVC push buttons TV3024-ZC10-01(C)

Replace resistor with a potentiometer and keep adjusting it until it functions properly.
Forum: Troubleshooting TVs and Video Sources 01-12-2022, 10:51 PM
Replies: 18
Views: 8,817
Posted By alfatv
Re: Samsung UN58H5202AF - killing mosfet.. no power

The way I see it, when too many LEDs are shorted, voltage drop across all LEDs is smaller, then source-to-drain voltage is higher. Multiplied by current, mosfet power dissipation goes up. If too...
Forum: Troubleshooting TVs and Video Sources 01-10-2022, 05:03 PM
Replies: 95
Views: 5,444
Posted By alfatv
Re: Samsung 4K led model UE50NU7445U no picture

Those ESD protectors are mostly useful for external connectors like HDMI, USB.
I would just leave it alone.
Better invest in surge protector for mains and antenna (if used).
Forum: Troubleshooting TVs and Video Sources 01-05-2022, 09:02 AM
Replies: 7
Views: 539
Posted By alfatv
Re: General - Backlight LEDs Q.

This is doable, you need to get LED tester, then compare original and target LED for voltage, current and color.
Another check is for LED size and footprint.
Also often worn out LED's are blueish...
Forum: Troubleshooting TVs and Video Sources 01-03-2022, 09:15 AM
Replies: 5
Views: 335
Posted By alfatv
Re: LG 55" TV Model 55LF650T

1. Please feed to TV gradient patterns, white/red/green/blue and post pictures here.
https://www.eizo.be/monitor-test/ for example

2. Measure gamma voltages on T-con
Forum: Troubleshooting TVs and Video Sources 12-30-2021, 11:49 PM
Replies: 0
Views: 178
Posted By alfatv
Toshiba remote teardown

What a surprise, I will put it back to give them some privacy
Forum: Troubleshooting TVs and Video Sources 12-30-2021, 11:29 PM
Replies: 24
Views: 1,835
Posted By alfatv
Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

What is t-on? The voltages are stable with one side disconnected.
Forum: Troubleshooting TVs and Video Sources 12-30-2021, 03:56 PM
Replies: 24
Views: 1,835
Posted By alfatv
Re: Samsung un58tu7000fxza - Power cycles with no picture, only backlight

No picture with cable between sides disconnected, but TV stays on.
Anyways I got image to show up with scotch tape, however the brightness on bad side goes up and down every second or so.

Also...
Forum: Troubleshooting TVs and Video Sources 12-29-2021, 08:54 PM
Replies: 6
Views: 508
Posted By alfatv
Re: Back light change

You can verify correct placement with reflector sheet
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