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Search: Posts Made By: budm
Forum: Troubleshooting TVs and Video Sources Today, 01:08 AM
Replies: 5
Views: 73
Posted By budm
Re: LG 32LC7D No Backlight

Since you have backlights but no video, then it is has more than BL-ON control problem.
Do you get the 12V at T-CON fuse?
32" is not really worth much but for $20 main board, then it is not too...
Forum: Troubleshooting Audio Equipment Yesterday, 10:01 PM
Replies: 5
Views: 206
Posted By budm
Re: Yamaha RX-A3010 working, no sound output

As suggested, do you hear the speaker protection relays click on about 5 seconds later after turning on the receiver?
Do you get audio at the line out jacks?
Pleas upload the pictures of the rear...
Forum: Troubleshooting TVs and Video Sources Yesterday, 12:22 AM
Replies: 27
Views: 2,141
Posted By budm
Forum: Troubleshooting TVs and Video Sources Yesterday, 12:08 AM
Replies: 8
Views: 90
Posted By budm
Re: Samsung UA50f Backlight problem

You are looking to see how high the LED drive Voltage jumps up to when TV is first turned on, so you will have to repeat the test 4 times to see if they all jump up to the same level or not before...
Forum: Troubleshooting TVs and Video Sources Yesterday, 12:04 AM
Replies: 10
Views: 169
Posted By budm
Re: Dead Vizio M43-C1

This version of power supply board assembly does not have Backlights circuit, you can see that backlight section of the power supply board is not stuffed with parts, so this power supply board only...
Forum: Troubleshooting TVs and Video Sources 11-20-2019, 06:15 PM
Replies: 19
Views: 5,499
Posted By budm
Forum: Troubleshooting TVs and Video Sources 11-20-2019, 06:07 PM
Replies: 27
Views: 2,141
Posted By budm
Re: Samsung LN32A330J1D - BN44-00191B No secondary No Standby Sort of

RM801 is 0.22 Ohms!
You need to also check both MOSFETs in that section.
Forum: General Electronics Technical Discussion 11-20-2019, 11:30 AM
Replies: 4
Views: 191
Posted By budm
Re: Where find example circuits with explanation?

Need to know what kind of circuit example you are looking for since some of them can be really complicate.
You can also look at IC application circuit.
Forum: Troubleshooting TVs and Video Sources 11-20-2019, 11:27 AM
Replies: 4
Views: 36
Posted By budm
Re: Sharp Aquos LC-43CFE4142E only red light and won't turn on

Can I see good clear pictures of the whole backside of the TV so I can see how all the boards are connected together?
Forum: Troubleshooting TVs and Video Sources 11-20-2019, 11:25 AM
Replies: 8
Views: 90
Posted By budm
Re: Samsung UA50f Backlight problem

You have FOUR LED drivers so you need to check the Boosted Voltage output of each driver when you first turn on the TV.
Your pictures are too blur to be able to read any prints on the boards.
Forum: Troubleshooting TVs and Video Sources 11-20-2019, 12:41 AM
Replies: 6
Views: 77
Posted By budm
Re: Frame Rate Converter in UN50H6350AF

It does look like FRC is part of the T-CON.
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 10:25 PM
Replies: 22
Views: 204
Posted By budm
Re: SMPS schematic for Samsung UN46EH5000?

The constant current power supply the LED backlights, instead of vary the supply Voltage output of the Boosted converter to maintain the constant current, it uses low side PWM control element, I.E....
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 07:27 PM
Replies: 32
Views: 311
Posted By budm
Re: LG 42" 42LD550 start up.

Remove all the test resistors then connect all the connector back in place then check the resistance between GND and INV on pin to see what it shows.
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 07:22 PM
Replies: 22
Views: 204
Posted By budm
Re: SMPS schematic for Samsung UN46EH5000?

OVP pin is used to monitor the Output Voltage so If it goes too high due to no load it will shutdown the Boost converter, it is NOT for regulating the Output Voltage. So if that pin is trip some how,...
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 05:35 PM
Replies: 22
Views: 204
Posted By budm
Re: SMPS schematic for Samsung UN46EH5000?

But that is not a repair, instead of finding the cause of the problem the protection circuit is disabled instead.
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 04:21 PM
Replies: 19
Views: 119
Posted By budm
Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

You need to check all of them.
BTW, you meter can read 1600 Mega Ohms?
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 03:16 PM
Replies: 19
Views: 119
Posted By budm
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 02:46 PM
Replies: 8
Views: 152
Posted By budm
Re: Sharp LC-46D85UN works for 2 minutes shuts down with a pop

You can verify if the PNL_POW signal is OK or not by checking the PNL-12V that goes to the T-CON board, if 12V is there then the PNL_POW is fine.
Can we see the pictures of the whole backside of the...
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 02:43 PM
Replies: 19
Views: 119
Posted By budm
Re: TCL 55US57 Bad Tcon Or Bad Panel Boards

https://www.badcaps.net/forum/attachment.php?attachmentid=202911&d=1574193881
Start checking the RESISTANCE of those MLCC on that tab bonding board of the bad side.
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 02:41 PM
Replies: 22
Views: 204
Posted By budm
Re: SMPS schematic for Samsung UN46EH5000?

Pin 13 is the OVP for Boosted output Voltage protection in case there is no load, I.E. LED string has open circuit, so by adding another resistor between pin 13 and GND, that means the trip point of...
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 12:17 PM
Replies: 22
Views: 204
Posted By budm
Re: SMPS schematic for Samsung UN46EH5000?

You can experiment by driving one of your replacement LED at about 200mA with DC power supply and see what happen.
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 11:21 AM
Replies: 3
Views: 51
Posted By budm
Re: Sony XBR-49X700D: Vertical Lines

Tab bonding could have been damaged when you disassemble the panel.
Forum: Troubleshooting TVs and Video Sources 11-19-2019, 11:18 AM
Replies: 8
Views: 111
Posted By budm
Re: Vizio M651d-A2R won’t turn on

But where are the control Voltages readings?
Forum: Troubleshooting TVs and Video Sources 11-18-2019, 10:30 PM
Replies: 22
Views: 204
Posted By budm
Re: SMPS schematic for Samsung UN46EH5000?

I won't trust that seller spec, if that is all the seller can provide.
Boards:
https://www.shopjimmy.com/catalogsearch/result/?q=Samsung+UN46EH5000
Forum: Troubleshooting TVs and Video Sources 11-18-2019, 10:18 PM
Replies: 22
Views: 204
Posted By budm
Re: SMPS schematic for Samsung UN46EH5000?

I do not see the If rating.
Vf typ. of 3.4V at 20mA? That cannot not right for backlights LED.
See Vf VS If graph sample, this example is rated at only 0.5W, most backlights use 1W LED.
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