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Search took 0.06 seconds. Search: Posts Made By: budm
Forum: Troubleshooting TVs and Video Sources 03-02-2021, 12:21 AM
Replies: 25
Views: 1,130
Posted By budm
Re: No power on Vizio D32F-E1 TV

That test will only be applied to the power supply board that has pull-up resistors for the power supply control signal lines for self test purpose, your power supply board does not have pull-up...
Forum: General Electronics Technical Discussion 03-01-2021, 12:29 AM
Replies: 13
Views: 1,794
Posted By budm
Re: I am in need of a 80 buck converter that is adjustable rated 4 amps or better

Not adjustable but you may be able to modify the feedback circuit.

What is the adjustable range?
https://www.amazon.com/Pro-Chaser-regulator-Scooters-Bicycles/dp/B07B6B6HQZ/ref=pd_sbs_4?
...
Forum: Troubleshooting TVs and Video Sources 02-28-2021, 01:30 AM
Replies: 8
Views: 289
Posted By budm
Re: Vizio VO42L, white logo, no backlight, no picture

I would start checking LDO Voltage Regulator IC's on the main board.

There is Main board repair kit and EEPROM also.
https://www.shopjimmy.com/search.php?search_query=Vizio+VO42
Forum: Troubleshooting TVs and Video Sources 02-28-2021, 01:24 AM
Replies: 25
Views: 1,130
Posted By budm
Re: No power on Vizio D32F-E1 TV

Please attach good clear pictures of the whole backside of the TV showing all the boards, and good clear straight shot of the whole power supply board so we can see what we are dealing with.
Forum: General Electronics Technical Discussion 02-27-2021, 12:02 AM
Replies: 13
Views: 1,794
Posted By budm
Re: I am in need of a 80 buck converter that is adjustable rated 4 amps or better

What is the highest input Voltage do you need?
Is the 80VDC the minimum input Voltage?
Forum: Troubleshooting Computer Displays 02-25-2021, 10:54 PM
Replies: 16
Views: 2,260
Posted By budm
Re: Need help hooking up LED back light strips.

Did you get any paper works that come with the LED driver board and the LED strip?
That LED driver board (constant current power supply) has the boost converter circuit that boost the 12VDC input to...
Forum: General Electronics Technical Discussion 02-23-2021, 05:01 PM
Replies: 7
Views: 312
Posted By budm
Re: Testing for short circuit in diode mode

+1
Diode mode does not show resistance reading, it shows Voltage drops reading of the device under test.
Forum: Troubleshooting TVs and Video Sources 02-22-2021, 03:49 PM
Replies: 17
Views: 395
Posted By budm
Re: Help diagnosing no backlight and no picture - Wasabi Mango

+1
Forum: Troubleshooting TVs and Video Sources 02-21-2021, 02:45 PM
Replies: 35
Views: 704
Posted By budm
Re: sony kdl 40x 3500 no backlights

The 6.8 Ohm across the relay contact is for limiting inrush current when power is applies to the circuit, the relay is closed to bypass the resistor when TV is turned on.
Forum: Troubleshooting TVs and Video Sources 02-20-2021, 09:43 PM
Replies: 14
Views: 455
Posted By budm
Re: Samsung UN55JU7500F

1) So if you run the power supply board by itself, does the PFC Boosted Voltage stay at 390VDC?

2) If all boards are connected. When TV is turned on, does the PSON stay at 4.5V or it jumps up and...
Forum: Troubleshooting TVs and Video Sources 02-20-2021, 09:39 PM
Replies: 17
Views: 395
Posted By budm
Re: Help diagnosing no backlight and no picture - Wasabi Mango

1) Can you show us the whole back side of the TV showing all the boards so we can see how they are connected together?

2) Remove the power supply board and see if there are pin labels for the...
Forum: Troubleshooting TVs and Video Sources 02-20-2021, 02:09 PM
Replies: 19
Views: 445
Posted By budm
Re: Philips 42" TV 42PFL3603D/F7 clicks but No LCD Backlight

If you turn on the TV in the dark room, do you see the backlights even flash on for seconds?
Not all lamps will be all bad at the same time, the good lamps should still come on then if the circuit...
Forum: Troubleshooting TVs and Video Sources 02-17-2021, 09:02 PM
Replies: 42
Views: 563
Posted By budm
Re: philips 55 oled 745 /12 3 blinks

Can you upload the chassis TMP18.1E schematic that you are using?
Forum: Troubleshooting TVs and Video Sources 02-15-2021, 06:47 PM
Replies: 28
Views: 500
Posted By budm
Re: Samsung UN40NU7100FXZA....MELTDOWN!

That is nothing compare to LG:
https://www.badcaps.net/forum/showthread.php?t=54197&highlight=LG+47LN5790
Forum: Troubleshooting TVs and Video Sources 02-15-2021, 05:39 PM
Replies: 28
Views: 500
Posted By budm
Re: Samsung UN40NU7100FXZA....MELTDOWN!

3 years warrant on Parts & Labor?
If not they can charge you big labor that can be more than what the product is worth.
I doubt that they will stock new replacement LCD panel for 3 years.
Forum: Troubleshooting TVs and Video Sources 02-15-2021, 05:21 PM
Replies: 28
Views: 500
Posted By budm
Re: Samsung UN40NU7100FXZA....MELTDOWN!

It means you can buy crap with longer warranty, instead of making good products so you know you do not have to worry about repairing them for a long time if you make it right in the first place....
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-15-2021, 04:59 AM
Replies: 16
Views: 608
Posted By budm
Re: Identifying THT resistor value + other Qs. [Electric blanket controller repair]

Can you attach good clear high res straight shots of the whole top and bottom side of the board?
Forum: Troubleshooting TVs and Video Sources 02-15-2021, 12:41 AM
Replies: 28
Views: 500
Posted By budm
Re: Samsung UN40NU7100FXZA....MELTDOWN!

Sad, 1 years old TV that failed due to bad design, poor thermal management.
If you can get it running again I would turn down the backlights to 50%.
Forum: Troubleshooting TVs and Video Sources 02-15-2021, 12:37 AM
Replies: 7
Views: 191
Posted By budm
Re: Sharp LC-65N7004U LED type

At what current did you drive the LED at to get the Vf of 3.3V?
Vf of LED will vary with drive current. Your LED is probably single LED.
Here is example of LG INNOTEK dual LED, Vf of 6.3V is...
Forum: Troubleshooting TVs and Video Sources 02-11-2021, 04:49 PM
Replies: 32
Views: 1,050
Posted By budm
Re: Does anyone know what LEDs an LG 55LM5400 uses?

Thanks for the follow-up.
So where did you get the correct replacement strips from so in the future people will know where to get them?
Forum: General Electronics Technical Discussion 02-10-2021, 02:31 PM
Replies: 9
Views: 462
Posted By budm
Re: Magneto-resistor Digital Output Potentiometer

I look at the schematic, the input of the circuit is for interfacing with the analog output of the sensor.
What is wrong with the old sensor?
Do you have high res or PDF of the schematic?
What is...
Forum: Troubleshooting TVs and Video Sources 02-10-2021, 02:08 PM
Replies: 34
Views: 673
Posted By budm
Re: Samsung LE40A676 takes several minutes to start

Since that area that you heat up has lytics cap (100uF 16VDC), you can try replacing that Cap (LOW ESR type).
Also, what is the designator and what is printed on that black rectangular component to...
Forum: Troubleshooting TVs and Video Sources 02-09-2021, 01:23 PM
Replies: 19
Views: 4,080
Posted By budm
Re: Samsung 32" LN32C450E1D red light, but no power on.

Thanks for the repair report, glad the thread helps solving the problem.
Forum: Troubleshooting TVs and Video Sources 02-09-2021, 12:56 PM
Replies: 6
Views: 191
Posted By budm
Re: Sceptre X505BV - Logo appears for 1 sec then backlight shuts off, LEDs tested goo

I see.
So is the PFC boosted Voltage on the main cap staying at 380 ~ 400V after the LED shutdown?
And how about the BL-ON and PWM dim or ADIM control signals? Are they still present when the LED...
Forum: Troubleshooting TVs and Video Sources 02-09-2021, 12:26 PM
Replies: 6
Views: 191
Posted By budm
Re: Sceptre X505BV - Logo appears for 1 sec then backlight shuts off, LEDs tested goo

"Using the LED backlight tester I was able to confirm all LEDs are illuminating" Did you take apart the panel to see that all LED lights up?
What Voltage does the LED tester show on the reading for...
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