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Search: Posts Made By: budm
Forum: General Electronics Technical Discussion Yesterday, 08:53 PM
Replies: 5
Views: 57
Posted By budm
Re: Solar led chipset

That number does not look right, it may be custom IC. Did you try cleaning the top of the IC to see if you can see anything else on top of the IC? Any way, what is the board not doing?
Forum: Troubleshooting TVs and Video Sources Yesterday, 08:48 PM
Replies: 9
Views: 123
Posted By budm
Forum: Troubleshooting TVs and Video Sources Yesterday, 08:44 PM
Replies: 4
Views: 100
Posted By budm
Re: LG 55UH615A Half Screen Dark, Replaced LED's & Power Board, Completely Stumped

Show us good clear pictures of the whole backside of the TV showing all the boards, then good clear straight shots of the whole power supply board so we can see what we are dealing with.
Forum: Troubleshooting Audio Equipment 12-02-2020, 06:48 PM
Replies: 12
Views: 2,206
Posted By budm
Re: Polkaudio DSW PRO 500 not switching on solved

Can you provide good clear straight shots pictures of the whole top side and bottom side of the boards so I can give you the test points to test?
Forum: Troubleshooting Audio Equipment 12-01-2020, 01:16 PM
Replies: 15
Views: 311
Posted By budm
Re: DC detection circuit failure on Subwoofer

I do not think in this case the relay release time (speakers disconnected when error occur) is much of a factor.
The zener being used in this case will also clamp to 0.6V (compared to your figure 3...
Forum: Troubleshooting TVs and Video Sources 12-01-2020, 02:10 AM
Replies: 6
Views: 107
Posted By budm
Re: Sony KD-60X690E 6 blink error

It is not a fix, it is to find out the LED's are failing when driven at high current or not, so if it will stay on longer when the backlights level is turned down, LEDs will run cooler, and you can...
Forum: Troubleshooting TVs and Video Sources 12-01-2020, 02:00 AM
Replies: 8
Views: 314
Posted By budm
Re: Samsung LCD TV LN55C610

What are the numbers printed on the original diode? The replacement (https://www.vishay.com/docs/88530/31gf6.pdf) you choose is not Shottky which is typically used in switching power supply.
Forum: Troubleshooting Audio Equipment 11-30-2020, 11:24 PM
Replies: 15
Views: 311
Posted By budm
Re: DC detection circuit failure on Subwoofer

Do you have 1N4007 to use sincee back EMF can be 100's of Volt from 24V coil? The snubber diode will try to clamp it down to Vf of the diode.
Forum: Troubleshooting Audio Equipment 11-30-2020, 02:11 PM
Replies: 1
Views: 17
Posted By budm
Re: Mirage PS-12 180 Sub Schematics

Show us good clear pictures of the unit, the boards and how they are connected together. It may be dirty pot or the coupling caps have leakage current to allow DC to be present on the pot, but do you...
Forum: Troubleshooting TVs and Video Sources 11-29-2020, 09:40 PM
Replies: 65
Views: 1,011
Posted By budm
Re: LG 47 LM8600 - No Video

https://www.badcaps.net/forum/attachment.php?attachmentid=224410&d=1606335986
There are 4 more switching power supplies, you can see inductors with220 and 6R8 markings, that you need to check. There...
Forum: Troubleshooting TVs and Video Sources 11-29-2020, 02:05 AM
Replies: 65
Views: 1,011
Posted By budm
Re: LG 47 LM8600 - No Video

I would check other Voltage outputs of other buck converters too to get some idea if they are working and putting out correct Voltages or not.
Forum: Troubleshooting TVs and Video Sources 11-28-2020, 03:32 PM
Replies: 65
Views: 1,011
Posted By budm
Re: LG 47 LM8600 - No Video

It may be setup as 1V Buck converter, you can verify if that is true or not by checking the feedback resistor network, see the R1 and R2 of the IC spec sheet and see the resistors value used in your...
Forum: Troubleshooting TVs and Video Sources 11-28-2020, 03:07 PM
Replies: 65
Views: 1,011
Posted By budm
Re: LG 47 LM8600 - No Video

What is the Vin feeding that IC?
Forum: Troubleshooting TVs and Video Sources 11-28-2020, 02:48 PM
Replies: 65
Views: 1,011
Posted By budm
Re: LG 47 LM8600 - No Video

So right now if you do not have LCD panel connected to the T-CON board, what DC Voltage do you have on the caps that show 12 Ohms readings.
Forum: Troubleshooting TVs and Video Sources 11-28-2020, 02:33 PM
Replies: 65
Views: 1,011
Posted By budm
Re: LG 47 LM8600 - No Video

As you can see, the 3 buck converters, one has very low Ohms reading on the output pin compared to other output pin of other 2 buck converters.
If you look at the schematics of the IC302, you need...
Forum: Troubleshooting TVs and Video Sources 11-28-2020, 02:41 AM
Replies: 65
Views: 1,011
Posted By budm
Re: LG 47 LM8600 - No Video

So are all the caps in that section show 12 Ohms?
IC302: You need to check the resistance (with and without ribbon cables between T-CON and LCD panel) between circuit ground and LX pin, circuit...
Forum: Troubleshooting TVs and Video Sources 11-27-2020, 08:41 PM
Replies: 1
Views: 54
Posted By budm
Re: Sony XBR-65X900A - Vertical Bars Help

You should not start a new thread when you already have a thread running for this same TV, it causes more confusion and tracking the progress.

https://www.badcaps.net/forum/showthread.php?t=90623
Forum: Troubleshooting TVs and Video Sources 11-27-2020, 08:39 PM
Replies: 66
Views: 1,466
Posted By budm
Re: VIZIO D60-F3 Wont Power ON, No Standby, No Picture, No Sound

So yo are not getting PS-ON when all the boards are connected, correct?
and since you do not get any LED indicator on the front panel of the TV either so there is something going on with the main...
Forum: Troubleshooting TVs and Video Sources 11-27-2020, 08:28 PM
Replies: 65
Views: 1,011
Posted By budm
Re: LG 47 LM8600 - No Video

12 Ohms in both directions when you switch the probes around?
IC302, as you can see, there are 3 switching power supplies in that section of the board, you can see 3 inductors, they are labeled with...
Forum: General Electronics Technical Discussion 11-27-2020, 06:31 PM
Replies: 9
Views: 136
Posted By budm
Re: Need to create a circuit with a linear relationship between Vin and Vout

It looks like crappy schematic capture/simulator program with bad component libraries.
I mean you look at the schematic you can just see what is not right right away, I.E. the effect of body diode...
Forum: Troubleshooting Audio Equipment 11-27-2020, 06:24 PM
Replies: 15
Views: 311
Posted By budm
Re: DC detection circuit failure on Subwoofer

Since the B+ is 35VDC , relay is 24VDC coil, so the Vdrops on the R19 should be around 10 ~ 11VDC.
Forum: Troubleshooting Audio Equipment 11-27-2020, 04:40 PM
Replies: 15
Views: 311
Posted By budm
Re: DC detection circuit failure on Subwoofer

"Relay: 0V voltage drop"

You need to check the DC resistance of the relay coil and the dc resistance of snubber diode D4, suspecting shorted D4.
Forum: Troubleshooting Audio Equipment 11-27-2020, 03:43 PM
Replies: 15
Views: 311
Posted By budm
Re: DC detection circuit failure on Subwoofer

Just for testing, you should be able to short the E and C pin of Q11 to force on Q10.

"Voltage at B+ being +35V, if Q10 is on then, if Iím not mistaken, there should be a +35V voltage drop at...
Forum: General Electronics Technical Discussion 11-27-2020, 03:09 PM
Replies: 9
Views: 136
Posted By budm
Forum: General Electronics Technical Discussion 11-27-2020, 01:01 AM
Replies: 9
Views: 136
Posted By budm
Re: Need to create a circuit with a linear relationship between Vin and Vout

I am curious about your schematic capture and simulation program you are using, I cannot see how you can get those graphs from the circuit simulation when the wrong MOSFET is used to simulate the...
Showing results 1 to 25 of 500

 
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