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Search: Posts Made By: budm
Forum: Troubleshooting TVs and Video Sources Today, 01:07 PM
Replies: 2
Views: 47
Posted By budm
Re: SONY Bravia kdl-40w4100 bad Tcon sympthons

Show us the pictures of the boards and the whole back side of the TV showing all the boards so we can see what we are dealing with.
Forum: Troubleshooting TVs and Video Sources Today, 01:02 PM
Replies: 7
Views: 49
Posted By budm
Re: Apex LD 4088 backlight shut down

https://www.badcaps.net/forum/attachment.php?attachmentid=220763&d=1601342388
Are the Inverter board mounting screws missing?
Inspect the Inverter transformers as suggested, also unplug the...
Forum: Troubleshooting TVs and Video Sources 09-24-2020, 12:46 PM
Replies: 3
Views: 96
Posted By budm
Re: Samsung TV LA46B550K1R flickering issue, so near yet so far

You will put your DC Volt meter's probes on each leg of cap CP803 (100uF 450VDC), the Voltage should be between 380 ~ 400Vdc when TV is turned on, you must be real careful since you are making...
Forum: Troubleshooting TVs and Video Sources 09-24-2020, 10:53 AM
Replies: 3
Views: 96
Posted By budm
Re: Samsung TV LA46B550K1R flickering issue, so near yet so far

Cutting jumper is not real solution, all it did was disconnecting the LOW PFC boost Voltage protection circuit, the problem is low PFC boosted Voltage due to resistor network in the PFC Voltage...
Forum: Troubleshooting TVs and Video Sources 09-23-2020, 09:52 PM
Replies: 6
Views: 120
Posted By budm
Re: TCL 55S403 No picture. Sound and Backlight OK.

Show us good clear pictures (using 'Go Advanced' to attach the pictures) of the whole backside of the TV showing all the boards so we can see what we are dealing with.
Forum: Troubleshooting TVs and Video Sources 09-23-2020, 09:49 PM
Replies: 2
Views: 86
Posted By budm
Re: M60-C3 Replaced PSU & Main Board: Still No Good

1) Please attach good clear pictures of the whole back side of the TV showing all the boards so we can see what we are dealing with.

2) So do the backlights also turn on and off on its own too?
Forum: General Electronics Technical Discussion 09-23-2020, 02:50 PM
Replies: 13
Views: 212
Posted By budm
Re: Motor run capacitor physical size vs voltage rating & measurements?

There some interesting about motor back EMF.
http://physics.bu.edu/~duffy/sc545_notes04/back_emf.html

This is very interesting to me now, will study more.
BTW, the reason I ask if you can get...
Forum: Troubleshooting TVs and Video Sources 09-23-2020, 01:19 PM
Replies: 4
Views: 190
Posted By budm
Re: KDL-60EX700 7 Blinks

You can still use the HLR board by disconnecting the RGB sensor, show good clear pictures of the top and bottom side of the HLR board, or order the replacement.
Forum: Troubleshooting TVs and Video Sources 09-23-2020, 01:13 PM
Replies: 3
Views: 106
Posted By budm
Re: Samsung LN46C530F1FXZA Dead Set No Standby

I mean T3.15A rated fuse (FS802S designator) as shown in your picture, I just did not write down the whole thing.
Yes, you do need to test all those parts I mention, and both filter caps need to be...
Forum: Troubleshooting TVs and Video Sources 09-22-2020, 10:10 PM
Replies: 3
Views: 106
Posted By budm
Re: Samsung LN46C530F1FXZA Dead Set No Standby

That T3 fuse is used for feeding B+ to the inverter circuit and the standby power supply circuit.

You need to test MOSFET's QI802, QI808, and SMPS IC ICM801(you need to get the P/N of this IC to...
Forum: Troubleshooting TVs and Video Sources 09-22-2020, 09:49 PM
Replies: 3
Views: 128
Posted By budm
Re: Vizio V705-G1 no power

1) Please attach good clear pictures of the whole backside of the TV showing all the boards so we can see what we are dealing with.

2) Report the Voltage readings you have done.

3) Show us the...
Forum: Troubleshooting TVs and Video Sources 09-22-2020, 09:33 PM
Replies: 10
Views: 265
Posted By budm
Re: Sharp Aquos Quattron LC-52LE835X Totally Dead, no output voltages

It is a waste of time to replace the PFC IC, The standby power supply section needs to be fixed first, nothing else will work until the standby power supply is working first.
BTW, PFC Voltage...
Forum: General Electronics Technical Discussion 09-22-2020, 09:18 PM
Replies: 13
Views: 212
Posted By budm
Re: Motor run capacitor physical size vs voltage rating & measurements?

Can you access the center point to be able to measure Vb and Vc?
Forum: Troubleshooting TVs and Video Sources 09-21-2020, 02:51 PM
Replies: 10
Views: 265
Posted By budm
Re: Sharp Aquos Quattron LC-52LE835X Totally Dead, no output voltages

If your AC power line is 220VAC, the DCV measured between the two legs of the main filter caps should be around 320VDC, and then it should be around 380 ~ 400VDC when PFC Voltage booster circuit...
Forum: Troubleshooting Audio Equipment 09-21-2020, 12:29 PM
Replies: 17
Views: 717
Posted By budm
Re: Help diagnosing JBL Live 400BT headphones that do not power on

So check the Voltage between GND and each pin of the power switch when it is set to off and when it is set to on.
Forum: General Electronics Technical Discussion 09-20-2020, 04:25 PM
Replies: 13
Views: 212
Posted By budm
Re: Motor run capacitor physical size vs voltage rating & measurements?

The Voltage on the cap is higher than the AC line Voltage due to back EMF generated by the motor winding.
Forum: Troubleshooting TVs and Video Sources 09-20-2020, 03:37 PM
Replies: 13
Views: 297
Posted By budm
Re: UN65HU9000 T-con

Thanks for the follow-up.
Forum: Troubleshooting Audio Equipment 09-20-2020, 12:39 PM
Replies: 17
Views: 717
Posted By budm
Re: Help diagnosing JBL Live 400BT headphones that do not power on

So the 'Blue' and 'White' LEDs are right next to the power switch, correct?
How many pins are there on the switch? 2, 3?
Forum: Troubleshooting Audio Equipment 09-19-2020, 01:19 PM
Replies: 17
Views: 717
Posted By budm
Forum: Troubleshooting TVs and Video Sources 09-19-2020, 01:17 PM
Replies: 10
Views: 265
Posted By budm
Re: Sharp Aquos Quattron LC-52LE835X Totally Dead, no output voltages

Your post #1:
"The Power Factor Corrections block for main 3 bulk capacitors (C7800A, C7800B and C7800C and mosfet Q7801 has 223v output."
What did you use for ground ref. for the meter?
Your...
Forum: Troubleshooting TVs and Video Sources 09-18-2020, 03:14 AM
Replies: 36
Views: 450
Posted By budm
Re: Samsung UE55KU6575U SHOWS ONLY HALF SCREEN

Yeah, I just notice that vertical bar to.
What is the history of this TV?
Forum: General Electronics Technical Discussion 09-17-2020, 11:28 PM
Replies: 26
Views: 837
Posted By budm
Re: Help identify a Zener?

That is not 'Z', the the 'N' logo of National Semiconductor.
https://en.wikipedia.org/wiki/National_Semiconductor

You can find out if it is 5V Zener or not by connecting 470 Ohms resistor in...
Forum: Troubleshooting TVs and Video Sources 09-17-2020, 11:09 PM
Replies: 36
Views: 450
Posted By budm
Re: Samsung UE55KU6575U SHOWS ONLY HALF SCREEN

OK, so the LED string #1 and #2 are connected in series to form one large string.
If you look at the output Voltage as printed board, you will see that the LED power supply is rated at 200V 520mA,...
Forum: Troubleshooting TVs and Video Sources 09-17-2020, 02:40 PM
Replies: 36
Views: 450
Posted By budm
Re: Samsung UE55KU6575U SHOWS ONLY HALF SCREEN

What is the power supply board part number?
BN44-??????
Forum: Troubleshooting TVs and Video Sources 09-17-2020, 01:38 PM
Replies: 14
Views: 246
Posted By budm
Re: Samsung Un60F8000 Boot Loop

Did you open up the TV and inspect the inside of the TV and also try re-seating the cables?
What Voltage testing have you done?
Remove the cable between power supply board and the main board and...
Showing results 1 to 25 of 500

 
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