Forum: Troubleshooting Audio Equipment
02-17-2022, 11:26 PM
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Replies: 14
Views: 465
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Forum: Troubleshooting Audio Equipment
02-17-2022, 01:21 AM
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Replies: 133
Views: 11,159
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Forum: General Electronics Technical Discussion
07-26-2021, 08:08 PM
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Replies: 21
Views: 2,637
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,...
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Forum: General Electronics Technical Discussion
06-14-2021, 08:48 PM
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Replies: 5
Views: 651
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Forum: General Electronics Technical Discussion
05-25-2021, 09:13 PM
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Replies: 84
Views: 5,948
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.
...
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Forum: General Electronics Technical Discussion
05-17-2021, 10:52 PM
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Replies: 84
Views: 5,948
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Forum: Troubleshooting TVs and Video Sources
05-09-2021, 08:42 PM
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Replies: 26
Views: 2,203
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Forum: Troubleshooting TVs and Video Sources
05-07-2021, 03:28 PM
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Replies: 26
Views: 2,203
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Forum: Troubleshooting TVs and Video Sources
05-06-2021, 07:52 PM
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Replies: 26
Views: 2,203
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Forum: Troubleshooting TVs and Video Sources
05-05-2021, 10:08 PM
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Replies: 106
Views: 6,236
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Forum: Troubleshooting Power Supplies and Power Supply Design
05-04-2021, 09:21 PM
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Replies: 37
Views: 2,936
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...
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Forum: Troubleshooting TVs and Video Sources
05-04-2021, 02:05 PM
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Replies: 4
Views: 537
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...
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Forum: Troubleshooting TVs and Video Sources
05-02-2021, 05:50 PM
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Replies: 35
Views: 2,380
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...
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Forum: Troubleshooting TVs and Video Sources
05-01-2021, 11:44 PM
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Replies: 42
Views: 1,471
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...
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Forum: Troubleshooting TVs and Video Sources
05-01-2021, 11:09 PM
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Replies: 42
Views: 1,471
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Forum: Troubleshooting TVs and Video Sources
05-01-2021, 10:55 PM
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Replies: 42
Views: 1,471
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Forum: Troubleshooting TVs and Video Sources
05-01-2021, 10:45 PM
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Replies: 42
Views: 1,471
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.
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Forum: Troubleshooting TVs and Video Sources
05-01-2021, 10:00 PM
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Replies: 42
Views: 1,471
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Forum: Troubleshooting TVs and Video Sources
05-01-2021, 09:21 PM
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Replies: 35
Views: 2,380
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...
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Forum: Troubleshooting TVs and Video Sources
05-01-2021, 08:57 PM
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Replies: 35
Views: 2,380
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Forum: Troubleshooting TVs and Video Sources
05-01-2021, 08:53 PM
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Replies: 35
Views: 2,380
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...
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Forum: Troubleshooting TVs and Video Sources
05-01-2021, 08:44 PM
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Replies: 42
Views: 1,471
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...
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Forum: Troubleshooting TVs and Video Sources
05-01-2021, 08:12 PM
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Replies: 106
Views: 6,236
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,...
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