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Search: Posts Made By: budm
Forum: General Electronics Technical Discussion 07-26-2021, 08:08 PM
Replies: 21
Views: 1,063
Posted By budm
Re: Using a Variac to simulate UPS battery

This was what I did in t he lab to test the UPS without having the batteries around, it is just enough to make the UPS run at low AC load.
I use old UPS transformer 120VAC side fed by the VARIAC,...
Forum: General Electronics Technical Discussion 06-14-2021, 08:48 PM
Replies: 5
Views: 332
Posted By budm
Re: Transistor or V regulator identification - help

The schematic drawing does not match the board layout, for example: the resistor 8061 is directly connected between Base and the Collector pin of the Transistor, but the drawing shows it has...
Forum: General Electronics Technical Discussion 05-25-2021, 09:13 PM
Replies: 84
Views: 3,773
Posted By budm
Re: LED Resistor Calculations ...

Is it really 117c not 117f?
If it is that hot I wonder what the junction Temp of the LED is.
Typical 1W white LED has junction temp max of around 110c.
...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-19-2021, 11:08 PM
Replies: 6
Views: 429
Posted By budm
Re: Help diagnose no power on Changhong board

So c910 running cap in the hot side checked out OK for sure?
Forum: General Electronics Technical Discussion 05-17-2021, 10:52 PM
Replies: 84
Views: 3,773
Posted By budm
Forum: Troubleshooting TVs and Video Sources 05-09-2021, 08:42 PM
Replies: 26
Views: 1,606
Posted By budm
Re: LG 55UJ6200 BEFORE & AFTER tape fix/fine tuning success

LCD TV will have T-CON. It can be stand alone T-CON board, integrated T-CON into the LCD panel, or integrated T-CON into the main board.
Can we see the pictures of the whole back side of the TV...
Forum: Troubleshooting TVs and Video Sources 05-07-2021, 03:28 PM
Replies: 26
Views: 1,606
Posted By budm
Re: LG 55UJ6200 BEFORE & AFTER tape fix/fine tuning success

Bad caps can be replaced if you have experience with SMD repair and have proper tools.
Example of bad MLCC:
https://www.badcaps.net/forum/showthread.php?p=1043044#post1043044
Forum: Troubleshooting TVs and Video Sources 05-06-2021, 07:52 PM
Replies: 26
Views: 1,606
Posted By budm
Re: LG 55UJ6200 BEFORE & AFTER tape fix/fine tuning success

You can try testing resistance of the MLCC (Multi Layer Ceramic Capacitors) on the tab bonding boards to see if any of them show low resistance reading.
Forum: Troubleshooting TVs and Video Sources 05-05-2021, 10:08 PM
Replies: 106
Views: 4,310
Posted By budm
Re: Vizio E65-E3 Dead after backlight replacement

Great, so can you do the conclusion as to what is done and replaced since the thread got very long? Thanks.
Forum: Troubleshooting Power Supplies and Power Supply Design 05-04-2021, 09:21 PM
Replies: 37
Views: 2,130
Posted By budm
Re: Sonos Playbase S11 dead. No led at the front

So you also have 3.3V, so far you do have 5V and 3.3V to run the logic circuits.
What is the history of the unit? It mat be FW issue. Did you do any search to see if other people have the same...
Forum: Troubleshooting TVs and Video Sources 05-04-2021, 02:05 PM
Replies: 4
Views: 323
Posted By budm
Re: Samsung ue32h5500 backlight but no picture

Are the tab bonding boards on the bottom edge of the LCD panel?
Inspect the tab bonding boards for any sign of damage and also check the resistance on the MLCC's (Multi Layer Ceramic Cap) of the tab...
Forum: Troubleshooting TVs and Video Sources 05-02-2021, 05:50 PM
Replies: 34
Views: 1,383
Posted By budm
Re: Sharp LC-40LE810UN Zero Power

Pin 1 and 2 are in the hot side, so the circuit ground will be the negative leg of the main filter cap in the hot side. What ground did you use?
And the reason I have you measure right between the...
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 11:44 PM
Replies: 42
Views: 901
Posted By budm
Re: 42pfl5432d/37 no picture but have sound

Not going to work as design at heavy load, the inverters can easily draw 5A or more. I would replace all 3 of them that is what I would do first. When cap is domed up like that the ESR will be high...
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 11:09 PM
Replies: 42
Views: 901
Posted By budm
Re: 42pfl5432d/37 no picture but have sound

The tops of those two green caps do not look flat to me.
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 10:55 PM
Replies: 42
Views: 901
Posted By budm
Re: 42pfl5432d/37 no picture but have sound

I just look at your power supply board, I see two caps for the 24V power supply have domed tops, Can you inspect and verify them and provide clearer pictures?
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 10:45 PM
Replies: 42
Views: 901
Posted By budm
Re: 42pfl5432d/37 no picture but have sound

'15' is the fuse code for 0.75A rating.
If you look at those white fuses that are showing 18V, if you trace out the connections, they will all lead back to 24V pins on the connector.
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 10:00 PM
Replies: 42
Views: 901
Posted By budm
Re: 42pfl5432d/37 no picture but have sound

Those fuses are fed by 24V so they all should be showing 24V, not 18V. May be recheck your measurement again.
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 09:21 PM
Replies: 34
Views: 1,383
Posted By budm
Re: Sharp LC-40LE810UN Zero Power

It is LB connector pin SB, I am having a hard time trying to read the prints on the board.
So right now the main board does send out the PS-ON but no PNL_POW and no STB (BL-ON) signal,and you also...
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 08:57 PM
Replies: 34
Views: 1,383
Posted By budm
Re: Sharp LC-40LE810UN Zero Power

BTW, what DCV do you get on the PD STB (BL-ON) pin?
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 08:53 PM
Replies: 34
Views: 1,383
Posted By budm
Re: Sharp LC-40LE810UN Zero Power

AC_DET is for protection FOR not allowing the power supply to come on if the AC line Voltage is not within operating range, the PS-ON will not be sent if AC_DET detects problem and sends the error...
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 08:44 PM
Replies: 42
Views: 901
Posted By budm
Re: 42pfl5432d/37 no picture but have sound

There are FIVE fuses on the Master inverter board,
F1 is a small Black fuse 0.75A 76V.

F101, 102, 103, and 104 are White fuses 3A 63V, there are loacate next to each one of the black Lytics...
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 08:12 PM
Replies: 106
Views: 4,310
Posted By budm
Re: Vizio E65-E3 Dead after backlight replacement

Power supply for the 70 inch panel may have higher LED drive Voltage and current dues to more LEDs for larger panel, so it may be over driving your 60 inch LEDs.
And with the old power supply board,...
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 08:07 PM
Replies: 34
Views: 1,383
Posted By budm
Re: Sharp LC-40LE810UN Zero Power

And what DCV do you get when measure between pin 3 and 4 of the OPTO?
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 08:05 PM
Replies: 34
Views: 1,383
Posted By budm
Re: Sharp LC-40LE810UN Zero Power

Is there CTR marking on the OPTO on your board?
Forum: Troubleshooting TVs and Video Sources 05-01-2021, 02:47 PM
Replies: 34
Views: 1,383
Posted By budm
Re: Sharp LC-40LE810UN Zero Power

I do not understand the reading of XX to YY.
Are you saying when TV is off but plugged into the AC outlet is, I.E. UR13V is 0V when TV is OFF, when TV is on it goes to 12.5V?
Are you also 1005 sure...
Showing results 1 to 25 of 500

 
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