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Search: Posts Made By: budm
Forum: Troubleshooting TVs and Video Sources Yesterday, 10:32 PM
Replies: 63
Views: 405
Posted By budm
Re: What type of fuse is this?

It is easier to remove the MOSFET's.
Forum: Troubleshooting TVs and Video Sources Yesterday, 07:56 PM
Replies: 63
Views: 405
Posted By budm
Re: What type of fuse is this?

There are two of them so remove them and test them off the board.
Forum: Troubleshooting TVs and Video Sources Yesterday, 07:42 PM
Replies: 63
Views: 405
Posted By budm
Re: What type of fuse is this?

PFC circuit: check resistance between S and D pin of the PFC MOSFET's.
Check resistance between A and K of the PFC DIODE.
The reading of 0.3 Ohms between the two outer pins (+ & -) of the bridge...
Forum: Troubleshooting TVs and Video Sources Yesterday, 07:02 PM
Replies: 63
Views: 405
Posted By budm
Re: What type of fuse is this?

Bridge rectifiers.
Test the bridge rectifiers.
Forum: Troubleshooting TVs and Video Sources Yesterday, 06:45 PM
Replies: 63
Views: 405
Posted By budm
Forum: Troubleshooting TVs and Video Sources Yesterday, 06:33 PM
Replies: 63
Views: 405
Posted By budm
Re: What type of fuse is this?

They are clamped between the long and short heatsink.
Forum: Troubleshooting TVs and Video Sources Yesterday, 06:20 PM
Replies: 4
Views: 50
Posted By budm
Re: Megmeet MIP390HW power supply problem

It nay be NCP1250.
Looking at your board lay out, the connections of the IC's pins seem to match with NCP1250.
1 = gnd
4 = CS
5 = VCC
6 = Gate drive

BTW, it also matches FAN6862-D, SG6858.
Forum: Troubleshooting TVs and Video Sources Yesterday, 05:59 PM
Replies: 63
Views: 405
Posted By budm
Re: What type of fuse is this?

So what resistance do you get between the two outer pins of the bridge rectifier (it has two bridge rectifiers connected in parallel)?
MOV is X801S which you can check the resistance from the bottom...
Forum: Troubleshooting TVs and Video Sources Yesterday, 04:40 PM
Replies: 7
Views: 76
Posted By budm
Re: Vizio M55-C2 Mainboard Issues

That inductor burns out can be due to 1) short circuit on the input side (Source) of the P-CH MOSFET (4435) Q9000 which supplies switched 12V to run the T-CON board. 2) Short Circuit on the output...
Forum: General Electronics Technical Discussion Yesterday, 04:05 PM
Replies: 7
Views: 79
Posted By budm
Re: Amplifier auto-start on sound input

That is Class D power amplifier, there are so much bad brown glue on that board that may have caused the circuit to go into Oscillation. I would removed as much glue as you can.
Forum: Troubleshooting TVs and Video Sources 11-16-2018, 08:13 PM
Replies: 10
Views: 203
Posted By budm
Re: Vizio E321VL - 2 Seconds to Black

"Filter cap has 172v with the TV off, 158v with the TV and backlight on, and 168v after the backlight goes out."
If that measurement is correct, that means the PFC Voltage booster is not working, it...
Forum: Troubleshooting TVs and Video Sources 11-16-2018, 08:06 PM
Replies: 63
Views: 405
Posted By budm
Re: What type of fuse is this?

I am looking for shorted load which will be connected in parallel with the filter caps.
So now you need to test the resistance between the two inner legs of the Bridge rectifier.
I need to get good...
Forum: Troubleshooting TVs and Video Sources 11-16-2018, 06:40 PM
Replies: 63
Views: 405
Posted By budm
Re: What type of fuse is this?

Check the RESISTANCE reading between the two legs (+ and - legs) of any one of the three main filter caps (3 large caps laying on its side), report the reading.
Forum: Troubleshooting TVs and Video Sources 11-16-2018, 06:31 PM
Replies: 10
Views: 203
Posted By budm
Re: Vizio E321VL - 2 Seconds to Black

Resistors are fine.
1) We need good clear straight shot pictures of the whole top and the bottom side of the power supply/inverter board. We also need the pictures of the whole backside of the TV...
Forum: General Electronics Technical Discussion 11-16-2018, 04:28 PM
Replies: 7
Views: 79
Posted By budm
Re: Amplifier auto-start on sound input

Search for Ps-10 thread, I provide the service manual that you can see how typical subwoofer turns itself on when audio input is present.
Forum: Troubleshooting TVs and Video Sources 11-16-2018, 03:55 PM
Replies: 10
Views: 203
Posted By budm
Re: Vizio E321VL - 2 Seconds to Black

Back lights dimming control signal.
Forum: Troubleshooting TVs and Video Sources 11-16-2018, 12:26 PM
Replies: 103
Views: 998
Posted By budm
Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

That will be fine, that method is used on many products.
BTW, for small wire, I just use one of the strand from stranded 24 ~ 26ga wire.
Forum: General Electronics Technical Discussion 11-16-2018, 11:23 AM
Replies: 34
Views: 224
Posted By budm
Re: Turning on and off AC MR16 LEDs with logic level DC

The way the unit is sealed like that, I will doubt that it will properly dissipate the heat.
Forum: General Electronics Technical Discussion 11-15-2018, 10:31 PM
Replies: 1
Views: 28
Posted By budm
Re: Interesting findings with a PWM driven DC motor circuit

What does the waveform look like if you measure between two GND points?
How is trace laid out for the GND path?
Forum: General Electronics Technical Discussion 11-15-2018, 03:57 PM
Replies: 19
Views: 199
Posted By budm
Re: DIY Backup with sealed lead acid battery

You will need more than 15V feeding the circuit.
http://www.ti.com/lit/an/snva581/snva581.pdf
What is the purpose of 15V Zener?
Forum: Troubleshooting Audio Equipment 11-15-2018, 03:03 PM
Replies: 12
Views: 185
Posted By budm
Re: Infinity PS-10 Subwoofer Disassembly

Service manual: https://www.badcaps.net/forum/showpost.php?p=288361&postcount=1
Forum: Troubleshooting TVs and Video Sources 11-15-2018, 02:49 PM
Replies: 103
Views: 998
Posted By budm
Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

R009 may be just jumper, check the resistance of R010, 103 to see if they show <1 Ohm.
Forum: Troubleshooting Computer Displays 11-15-2018, 02:42 PM
Replies: 29
Views: 303
Posted By budm
Re: Convert monitor ccfl to led

After looking at the angle shot of the screen again that is why I am still thinking that the sheets are not installed back in properly.
So now you are getting just white screen without any image any...
Forum: Troubleshooting TVs and Video Sources 11-15-2018, 02:39 PM
Replies: 31
Views: 267
Posted By budm
Re: LG 42LF561V No Video after backlight repair

That may be a good way to try.
When you install a new T-CON, check the Voltages at those test points to see if they are present or not.
Forum: Troubleshooting TVs and Video Sources 11-15-2018, 12:36 PM
Replies: 31
Views: 267
Posted By budm
Re: LG 42LF561V No Video after backlight repair

The LVDS will be very high and in mV range so DMM is not going to show anything much.
http://literature.cdn.keysight.com/litweb/pdf/5988-4797EN.pdf
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