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Search: Posts Made By: budm
Forum: Troubleshooting TVs and Video Sources Yesterday, 11:32 PM
Replies: 3
Views: 48
Posted By budm
Re: LG 50la6230 backlight issue

Can we at least see the pictures of the backside of the TV showing all the boards?
What is the power supply board P/N?
Forum: Troubleshooting TVs and Video Sources Yesterday, 08:59 PM
Replies: 3
Views: 47
Posted By budm
Re: Lg 42ld550v

Please attach good clear pictures of the boards for us to look at.
You should use 470 ~ 1K resistor between 5V (3.3V) standby power supply output and the control pins, I.E. PS-ON and BL-ON (some...
Forum: Troubleshooting TVs and Video Sources Yesterday, 08:52 PM
Replies: 3
Views: 34
Posted By budm
Re: Emerson LF501EM4 DS4 no standby led

You may have shorted cap on the main board.
Reconnect the cable between main board and power supply board then check the resistance between GND and p-on+21v, amp+13v 12.5v to see if any one of them...
Forum: Troubleshooting TVs and Video Sources Yesterday, 04:55 PM
Replies: 44
Views: 574
Posted By budm
Re: Samsung UN50F6300AF No Backlights

You don't.
My post #41:
You do not use the Voltmeter of the LED tester to check the output of the LED power supply!
Forum: Troubleshooting TVs and Video Sources 04-02-2020, 09:49 PM
Replies: 44
Views: 574
Posted By budm
Re: Samsung UN50F6300AF No Backlights

Series circuit:
"Before that I would like to know what the voltages at CNL802 should be approximately on a working system. R_J says "Channel1 voltage is 215vdc and channel2 voltage is 274vdc". That...
Forum: Troubleshooting TVs and Video Sources 04-02-2020, 09:40 PM
Replies: 44
Views: 574
Posted By budm
Re: Samsung UN50F6300AF No Backlights

"This tester reads 255 when plugged in. So the LED tester when connected to the appropriate pins at the power supply could read 255, 0 or somewhere in between. Is a reading somewhere in between the...
Forum: Troubleshooting Audio Equipment 04-02-2020, 05:48 PM
Replies: 2
Views: 74
Posted By budm
Re: Harman kardon AVR 310 blow fuses

Service manual: https://www.manualslib.com/download/893378/Harman-Kardon-Avr310.html
1) So the blown fuses FU484 and FU483 are on the Main Amp board, PDF page 121.
2) Did you check D568, 569, 570,...
Forum: Troubleshooting TVs and Video Sources 04-01-2020, 06:12 PM
Replies: 3
Views: 75
Posted By budm
Re: Vizio D55un-E1 burnt ceramic capacitor identification

Get higher Voltage rating, I.E. 2KV if you can, the cap is a snnuber cap for Q9100.
Forum: Troubleshooting TVs and Video Sources 04-01-2020, 04:38 PM
Replies: 44
Views: 574
Posted By budm
Re: Samsung UN50F6300AF No Backlights

BTW, did you check the resistance of diodes D9151C, D9251C in both direction with one leg lifted off the board?
Forum: Troubleshooting Audio Equipment 04-01-2020, 03:24 PM
Replies: 6
Views: 184
Posted By budm
Re: Luxman L3 problem

So the main AC fuse F001 is no longer blown after you disconnected the secondary windings form the board?
Did you check rectifiers D403 ~ 406 for sure that they are good?
Did you check the output...
Forum: Troubleshooting TVs and Video Sources 04-01-2020, 03:15 PM
Replies: 23
Views: 323
Posted By budm
Re: Samsung UN65KS9800FXZA Help

Sounds like another failed MLCC, they may have made good LCD glass panel but use bad caps on the tab bonding board.
They need to improve incoming inspection and handling of the MLCC.
Forum: Troubleshooting TVs and Video Sources 04-01-2020, 03:09 PM
Replies: 11
Views: 148
Posted By budm
Re: Sony KDL-52W5100 verticle lines

"I tried disconnecting the cables that connect the tcon to the LCD panel one at a time and I get mixed results. Sometimes half of the screen is black while the other half displays a normal picture"...
Forum: Troubleshooting TVs and Video Sources 04-01-2020, 03:00 PM
Replies: 44
Views: 574
Posted By budm
Re: Samsung UN50F6300AF No Backlights

I do not understand your readings, in your picture you show having DMM connected but the LED connector not in place.
The reading showing pin 12/10, 5/3 to be the same, are those reading with LED...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-31-2020, 08:48 PM
Replies: 12
Views: 133
Posted By budm
Re: Velodyne SMPS, power transformer

I would check the rectifiers on the cold side for sure to make sure they are still OK.
Forum: Troubleshooting Power Supplies and Power Supply Design 03-31-2020, 08:17 PM
Replies: 12
Views: 133
Posted By budm
Re: Velodyne SMPS, power transformer

Shorted MOSFET's at this point which causing main AC fuse to blow. You need to also check other component connected to the MOSFET to see if any of them are also damaged or not.
Forum: Troubleshooting TVs and Video Sources 03-31-2020, 08:15 PM
Replies: 8
Views: 67
Posted By budm
Re: Altius AL5517UHDS intermittent loss of picture - self fixes

Since the backlights stay on but no image on the screen, then you should verify if the 12VDC feeding the T-CON is still present or not when it acts up.
Forum: Troubleshooting Power Supplies and Power Supply Design 03-31-2020, 07:39 PM
Replies: 12
Views: 133
Posted By budm
Forum: Troubleshooting Power Supplies and Power Supply Design 03-31-2020, 06:32 PM
Replies: 12
Views: 133
Posted By budm
Re: Velodyne SMPS, power transformer

Check the resistance of the two power device (MOFET) on the heatsink in the hot side, also get the P/N as printed on the them.
Also check the bridge rectifier in the hot side....
Forum: Troubleshooting Power Supplies and Power Supply Design 03-31-2020, 04:23 PM
Replies: 12
Views: 133
Posted By budm
Re: Velodyne SMPS, power transformer

Why do you suspect that the power transformer is bad?
Show us good clear straight shot pictures of the whole top and bottom side of the board then we may be able to trace out the circuits.
Forum: Troubleshooting TVs and Video Sources 03-31-2020, 04:15 PM
Replies: 11
Views: 148
Posted By budm
Re: Sony KDL-52W5100 verticle lines

Does flexing the panel have any effect?
Forum: Troubleshooting TVs and Video Sources 03-31-2020, 03:53 PM
Replies: 16
Views: 211
Posted By budm
Re: Sony un50h5500 washed out image

The PCBA numbers on the barcode sticker do not matched.
SJ PCBA is 32746A, your is 30065A, you may want to verify that with SJ.
https://www.shopjimmy.com/samsung-bn96-30065a-t-con-board.htm#
BTW,...
Forum: Troubleshooting TVs and Video Sources 03-31-2020, 03:48 PM
Replies: 13
Views: 120
Posted By budm
Re: Toshiba 40ft1u blows fuse

Thanks for the follow-up.
BTW, Jxxx: J = JUMPER
Forum: Troubleshooting TVs and Video Sources 03-31-2020, 02:03 AM
Replies: 13
Views: 120
Posted By budm
Re: Toshiba 40ft1u blows fuse

But you indicate that he Bridge rectifier tested OK are you sure? If you check between ~ of the bridge rectifier you would have seen it shows as shorted since the VS101 is connected in parallel with...
Forum: Troubleshooting TVs and Video Sources 03-31-2020, 12:39 AM
Replies: 13
Views: 120
Posted By budm
Re: Toshiba 40ft1u blows fuse

1) What is the resistance of the main filter cap C101?
2) What is the resistance between the ~ of the bridge rectifier?
3) What is the resistance of VS101?
Forum: Troubleshooting TVs and Video Sources 03-30-2020, 10:05 PM
Replies: 11
Views: 661
Posted By budm
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