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Search: Posts Made By: budm
Forum: General Electronics Technical Discussion Yesterday, 09:52 PM
Replies: 27
Views: 421
Posted By budm
Re: Need a circuit that switches ON when a 5 volt source drops to 4 volts or less

So far OP refuses to provide the spec of the IR receiver, the actual schematic, the scope screenshot of the IR receiver output, etc.
See original thread here:...
Forum: Troubleshooting TVs and Video Sources Yesterday, 09:28 PM
Replies: 5
Views: 28
Posted By budm
Re: Sony Bravia KDL-46XBR4 Strange vertical colors

You have FRC (Frame Rate Conversion, so TV can do 120HZ refresh rate) board between Main board and the T-CON board.
Forum: Troubleshooting TVs and Video Sources Yesterday, 09:17 PM
Replies: 8
Views: 168
Posted By budm
Re: Insignia 42" LCD TV Blue Screen with Sound

You have panel issue, more likely shorted SMD cap/s on the tab bonding board (the boards between LCD panel and the T-CON board).
You will have to remove the LCD metal frame to get access to the tab...
Forum: Troubleshooting TVs and Video Sources Yesterday, 09:12 PM
Replies: 5
Views: 28
Posted By budm
Re: Sony Bravia KDL-46XBR4 Strange vertical colors

Dark cloud and horizon lines are Panel issue.
You need to monitor the Voltage test points (I.E. VGH, VGL, AVDD, etc) on the T-CON board.
Forum: Troubleshooting Power Supplies and Power Supply Design 01-25-2020, 11:24 PM
Replies: 8
Views: 130
Posted By budm
Re: Sony Bravia KD-65XE7096 with shorted power supply

https://www.badcaps.net/forum/attachment.php?attachmentid=206159&d=1580005552
So at what condition are readings were measured?
How can you have no Voltage on T-CON on but you have 12V on...
Forum: Troubleshooting TVs and Video Sources 01-25-2020, 05:47 PM
Replies: 77
Views: 7,359
Posted By budm
Re: Samsung LNS3251DA won’t power on, no sound, no standby light-power board problem

More likely that new MOSFET is blown again, it was OK when you first apply the power to the TV.
So did fuse blow the minute you bypass the lamp, or it blows the after the power switch is activated...
Forum: Troubleshooting TVs and Video Sources 01-25-2020, 03:13 PM
Replies: 7
Views: 123
Posted By budm
Re: sharp lc32d42u power supply - DPS-178APA

You count the PD connector pin wrong:
Pin 1 = PS-ON
Pin 2 = AC_DET
Pin 3 = GND
Pin 4 = PNL POWER
Pin 5 = BU 5V
Pin 6 = GND
Forum: Troubleshooting TVs and Video Sources 01-25-2020, 02:57 PM
Replies: 35
Views: 1,198
Posted By budm
Re: Samsung ue49k6300ak

So if the two cables from T-CON to the LCD panel are not connected, you still do not see any Voltages at these test points, VON, VSS, 1.1V, 3,3V, AVDD, HAVDD on the T-CON board?
You never tell us...
Forum: Troubleshooting TVs and Video Sources 01-25-2020, 02:40 PM
Replies: 77
Views: 7,359
Posted By budm
Forum: Troubleshooting TVs and Video Sources 01-24-2020, 08:47 PM
Replies: 12
Views: 160
Posted By budm
Re: 47LV5400 Component Values and Schematics

Shorts between what?
So the high side MOSFET Q503 is shorted between S and D, but was there shorts between GROUND and the output side of the L502?
MOSFET Q503 is on the high side, if it shorted out...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-24-2020, 08:34 PM
Replies: 8
Views: 130
Posted By budm
Re: Sony Bravia KD-65XE7096 with shorted power supply

BTW, you also need the BL-ON control to run on the LED driver circuit to get the LED Voltage booster circuit to come on.
Forum: Troubleshooting TVs and Video Sources 01-24-2020, 08:27 PM
Replies: 6
Views: 133
Posted By budm
Re: Lg 55ls5700-tb

Please upload the service manual and als the pictures of the whole backside of the TV showing all the board, and straight shot of the whole power supply board.
Is this the exact board you have?...
Forum: General Electronics Technical Discussion 01-24-2020, 08:10 PM
Replies: 4
Views: 142
Posted By budm
Re: Rework station pcb design

Do you know if the actual circuit is built and tested?
The TRIAC Gate drive/snubber R5 of 2.2K is way too high.
Read and study the ST application notes attached.
Power supply filter caps C5, C7...
Forum: Troubleshooting TVs and Video Sources 01-24-2020, 03:32 PM
Replies: 12
Views: 160
Posted By budm
Re: 47LV5400 Component Values and Schematics

Start by checking the resistance of C503 or 505 or 513.
Same for the MOSFET's as suggested.
Forum: Troubleshooting TVs and Video Sources 01-23-2020, 05:08 PM
Replies: 113
Views: 1,543
Posted By budm
Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

Also tell them that there are lots of people on BADCAPS that see the failure, it will make shopjjimmy look really bad.
Forum: Troubleshooting TVs and Video Sources 01-23-2020, 05:01 PM
Replies: 35
Views: 1,198
Posted By budm
Re: Samsung ue49k6300ak

15V with ref to chassis ground?
Disconnect both ribbon cable between LCD panel and the T-CON and see if you will any Voltage you have listed.
BTW, are you sure your DC Voltmeter is OK and accurate...
Forum: Troubleshooting TVs and Video Sources 01-23-2020, 10:30 AM
Replies: 13
Views: 120
Posted By budm
Re: UN60J6200AFXZA Backlight issue

That replacement is fine.
Forum: Troubleshooting TVs and Video Sources 01-23-2020, 10:23 AM
Replies: 13
Views: 120
Posted By budm
Re: UN60J6200AFXZA Backlight issue

What is the P/N of the bad one?
Forum: Troubleshooting TVs and Video Sources 01-23-2020, 09:53 AM
Replies: 13
Views: 120
Posted By budm
Forum: Troubleshooting TVs and Video Sources 01-23-2020, 09:38 AM
Replies: 113
Views: 1,543
Posted By budm
Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

just run the power supply board in self test mode by do not have the cable between the power supply and the main board connected to test the backlights. You should invest in LED tester.
Forum: Troubleshooting TVs and Video Sources 01-23-2020, 09:28 AM
Replies: 2
Views: 45
Posted By budm
Re: LG LCD 37LH7000 lines on display

Unplug the TV from the AC outlet then let it cool down, then heat up the main board with hair dryer for 2 ~ 3 minutes then power up the TV and see if the picture is OK or not.
Forum: Troubleshooting TVs and Video Sources 01-23-2020, 09:24 AM
Replies: 38
Views: 415
Posted By budm
Re: Another LG, 55ln5100 power issues

Test in diode mode will not show result in Ohm, it will show in Volt. Use Ohm mode to test fuse since bad fuse can have high resistance more than 10 Ohms so it will still show as conducting which...
Forum: Troubleshooting TVs and Video Sources 01-23-2020, 01:52 AM
Replies: 6
Views: 133
Posted By budm
Re: Lg 55ls5700-tb

Turn down the backlights level in the OSD User menu to as low as you can and see if the backlights will stay on longer.
Forum: Troubleshooting TVs and Video Sources 01-23-2020, 12:21 AM
Replies: 35
Views: 1,198
Posted By budm
Re: Samsung ue49k6300ak

That is not normal.
Are getting 12VDC on both ends of the fuse on the T-CON board when TV is turned on?
Forum: Troubleshooting TVs and Video Sources 01-22-2020, 11:17 PM
Replies: 38
Views: 415
Posted By budm
Re: Another LG, 55ln5100 power issues

It is rectifier diode for the 3.5V power supply, if it conducts both direction then the output will not be DC any more.
0.27 Ohms in both directions? Did you test it in Ohm mode? I do not think you...
Showing results 1 to 25 of 500

 
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