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Search: Posts Made By: budm
Forum: Troubleshooting TVs and Video Sources Today, 06:27 PM
Replies: 5
Views: 20
Posted By budm
Re: LG 49lf510V no backlight

If the total Vf is shown as 96.6V @30mA of drive current, that means the total VF of the LED string will be over 100V at over 100mA of drive current but the caps are only rated for 100V, something is...
Forum: Troubleshooting TVs and Video Sources Today, 03:45 PM
Replies: 5
Views: 20
Posted By budm
Re: LG 49lf510V no backlight

What is the AC adapter OUTPUT DC rating, 19V, 24V?
It sounds like the booster circuit (L501/502, Q502) is working since you do have 49V (but we do not know what it should be at this point). The...
Forum: Troubleshooting TVs and Video Sources Today, 02:20 PM
Replies: 1
Views: 18
Posted By budm
Re: Best Buy / Sharp LC-32LB261U backlight failure

You should check the dimension, and also remove the LED to find out what kind of foot print it has.
BTW, do you have the schematic?...
Forum: Troubleshooting TVs and Video Sources Today, 10:56 AM
Replies: 6
Views: 65
Posted By budm
Re: Sansui 55" LCD T V Model STY0955 (Backlight issue)

Are you sure that you did not get the two control signal backward, the BL-ON should be steady Voltage that either LO (<1V), or HI >2.5v.
The Dim may be PWM 200 Hz freq.
Can you read the P/N of the...
Forum: Troubleshooting TVs and Video Sources Today, 10:38 AM
Replies: 19
Views: 138
Posted By budm
Re: Vestel 17IPS20P pulsating

That is strange that R311 has to be 100 Ohms for the circuit to work since the pin 6 Cs has 12K input impedance. R311 and C319 is just simple RC filter.
It is also strange R370 is also shown as 120...
Forum: Troubleshooting TVs and Video Sources Today, 12:58 AM
Replies: 6
Views: 65
Posted By budm
Re: Sansui 55" LCD T V Model STY0955 (Backlight issue)

Please stay in this TV section instead of the power supply thread so I can easily keep track.
So I copied your paost 1 and my reply here:...
Forum: Troubleshooting TVs and Video Sources Yesterday, 05:59 PM
Replies: 4
Views: 68
Posted By budm
Re: Problem Source HKL-240101

https://www.badcaps.net/forum/attachment.php?attachmentid=190963&d=1550514215
Pin 5.- +4.85V is DIM control: OK
Pin 7.- 0.027V O/F = BL-ON: BAD (if it is Active high signal type)
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 05:42 PM
Replies: 1
Views: 24
Posted By budm
Re: Sansui 55" LCD TV Model STY955 Backlight or PSU???

1) TV OFF, put meter probe on the the two legs of capxon cap C13 (100uf 100V).
2) Set meter to 200V scale then turn on the TV while watching the meter to see how high it goes up to then wait 10...
Forum: Troubleshooting TVs and Video Sources Yesterday, 01:54 PM
Replies: 5
Views: 59
Posted By budm
Re: sony APS-277 Atypical failure

R6201 is fusible flame proof resistor it is used for feeding the Voltage from the main cap to the Standby power supply section, it will blow open if the STBY SMPS IC shorted out.
...
Forum: General Electronics Technical Discussion Yesterday, 12:44 PM
Replies: 3
Views: 47
Posted By budm
Re: 4k tv LED connector IF1, IF2?

That LCD panel you have does not have Zone controlled for the backlights so they just use one LED driver to drive just one LED string.
Forum: Troubleshooting TVs and Video Sources Yesterday, 11:26 AM
Replies: 27
Views: 318
Posted By budm
Re: Insignia NS-50d40SNA14not turning on

"4) If you have shorted LED's then at least the backlights should flash on for seconds BEFORE the protection circuits kick in, but you never see the backlights even come on for seconds, correct?
Forum: Troubleshooting TVs and Video Sources Yesterday, 11:25 AM
Replies: 27
Views: 318
Posted By budm
Forum: Troubleshooting TVs and Video Sources Yesterday, 11:24 AM
Replies: 27
Views: 318
Posted By budm
Re: Insignia NS-50d40SNA14not turning on

"3) Since PS-ON pin 3 never change state when turning TV on and off, that means the 12V/LED power supply will not be turn on, it is staying at <1V as you report. You will have to force on the power...
Forum: Troubleshooting TVs and Video Sources Yesterday, 01:36 AM
Replies: 27
Views: 318
Posted By budm
Re: Insignia NS-50d40SNA14not turning on

1) "- If I power the Backlights with my Backlight Tester, there still is no picture" Since there is no 12V that means you will not have 12V to run the T-CON board which means there will be no image...
Forum: Troubleshooting TVs and Video Sources 02-19-2019, 10:08 PM
Replies: 27
Views: 318
Posted By budm
Re: Insignia NS-50d40SNA14not turning on

https://www.shopjimmy.com/insignia-55-50s12-me2-main-board-for-ns-50d40sna14-loc-u21-eeprom-only.htm

Symptoms EEPROM replacement MAY fix:
- On screen display is stuck on logo screen
- TV won’t...
Forum: Troubleshooting TVs and Video Sources 02-19-2019, 09:59 PM
Replies: 51
Views: 453
Posted By budm
Re: Samsung UN55F6300AFXZA appears dead, stand-by present, main board suspect

I believe Nick's TV offer repair service for the main board, you may want to contact him.
Forum: General Electronics Technical Discussion 02-19-2019, 09:49 PM
Replies: 3
Views: 47
Posted By budm
Re: 4k tv LED connector IF1, IF2?

1) If look at the bottom side you will see that the pins are terminated to form series connections for the LED's strings.
2) IF? pins are not connected to anything, no traces to those pins.
3)...
Forum: Troubleshooting TVs and Video Sources 02-18-2019, 05:14 PM
Replies: 51
Views: 453
Posted By budm
Re: Samsung UN55F6300AFXZA appears dead, stand-by present, main board suspect

B5V and B13V are switched power supplies that will not be present until PS-ON from the main board is present to the power supply board to turn them on.
The power supply board has pull-up resistor to...
Forum: Troubleshooting TVs and Video Sources 02-17-2019, 06:34 PM
Replies: 13
Views: 159
Posted By budm
Re: LG 55LB6100 Led blinks every 4 seconds

On connector without LED's (with negative on chassis)
Bank 1 = Range between 226V and 197V
Bank 2 = Range between 173V and 160V

On connector with LED's(negative on chassis)
Bank 1 = 241,1V...
Forum: Troubleshooting TVs and Video Sources 02-17-2019, 04:48 PM
Replies: 13
Views: 159
Posted By budm
Re: LG 55LB6100 Led blinks every 4 seconds

Lots of stuff do not make sense to me:
1) With the TV switched on, and driving the backlights with my backlight tester the blink still occurs. How do you drive the two strings of the LED st the same...
Forum: Troubleshooting TVs and Video Sources 02-16-2019, 04:38 PM
Replies: 5
Views: 92
Posted By budm
Re: T Con board question

+1, Good eyes!
Forum: Troubleshooting TVs and Video Sources 02-16-2019, 02:34 PM
Replies: 5
Views: 92
Posted By budm
Re: T Con board question

You need to find out what the difference between the two panels are.
Forum: Troubleshooting TVs and Video Sources 02-16-2019, 02:27 AM
Replies: 51
Views: 453
Posted By budm
Re: Samsung UN55F6300AFXZA appears dead, stand-by present, main board suspect

https://www.badcaps.net/forum/attachment.php?attachmentid=190838&d=1550294594
I do not quite follow you, looking at the top side of the board you can see the odd number pins, which one are for the...
Forum: Troubleshooting TVs and Video Sources 02-15-2019, 10:58 PM
Replies: 5
Views: 92
Posted By budm
Re: T Con board question

'13Y_S120PAVLMB3C2LV0.0 ' That is blank PCB P/N, that blank board can be stuffed to make many PCB assemblies for the needed LCD panel, that is why you need to go by the PCB assembly P/N on the...
Forum: Troubleshooting TVs and Video Sources 02-15-2019, 10:48 PM
Replies: 51
Views: 453
Posted By budm
Re: Samsung UN55F6300AFXZA appears dead, stand-by present, main board suspect

Can I see closed up pictures around the connector where the A5V pins are to see where the traces go to? This is tough troubleshooting without the diagram. May be there is inductor between the In pin...
Showing results 1 to 25 of 500

 
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