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Search: Posts Made By: budm
Forum: Troubleshooting TVs and Video Sources Yesterday, 10:03 PM
Replies: 4
Views: 30
Posted By budm
Re: Insignia ns-48d510na15

Just want to make sure you are using the correct GND. So you do have Voltage feeding to the LED sring at one end but nothing coming out on other end per your reading then it means you have open...
Forum: Troubleshooting TVs and Video Sources Yesterday, 04:51 PM
Replies: 4
Views: 30
Posted By budm
Re: Insignia ns-48d510na15

Ar those readings with ref. to chassis GND?
Forum: Troubleshooting TVs and Video Sources Yesterday, 03:33 PM
Replies: 7
Views: 81
Posted By budm
Re: Sharp LC-60EQ10U Dark Screen

Read this thread to see how to check the Voltages at the LED connector and also how to check and see if the backlights will come on or not.
https://www.badcaps.net/forum/showthread.php?t=63972
Forum: Troubleshooting TVs and Video Sources Yesterday, 03:11 PM
Replies: 18
Views: 112
Posted By budm
Re: Hitachi LE55A6R9A, individual LED SPECS?

Voltage reading on the power supply + LED connector which is connected to the Anode of the LED string will show the Voltage of the total Vf of the LED string + Vdrops of the PWM controlled MOSFET and...
Forum: Troubleshooting TVs and Video Sources Yesterday, 02:56 PM
Replies: 4
Views: 25
Posted By budm
Re: About Bose 401448 audio/video

Pictures of what we are dealing with?
There is no panel sicker model number?
The more info you provide the more help you will get, it is hard to do long distant troubleshooting when we do not have...
Forum: Troubleshooting TVs and Video Sources Yesterday, 02:53 PM
Replies: 42
Views: 567
Posted By budm
Re: LC60LE830E Error Lamp,No control

Can we at least see the pictures of the whole back side of the TV showing how all the boards are connected together?
Also good clear straight shots of the whole power supply.
Power supply board...
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 07:25 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

Looking at the spec sheet, the cap will be charge up with 0.9mA current source so to get 18V, the resistance has to be at least 20K Ohms. So something is still not right at VCC pin. Right now you are...
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 07:14 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

The main key point right now is that the internal charge pump inside the IC has to charge up the cap on VCC pin to 18V for the circuit to startup. So I hope your replacement IC is good.
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 06:59 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

Well, what happen when you power up board after fixing the solder joints?
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 06:52 PM
Replies: 18
Views: 112
Posted By budm
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 06:51 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

So bad solder joints?
You might as well check the rest of the pins also.
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 06:44 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

You can easily verify that by checking the resistance between pin 2 LEG (not the solder pad that pin 2 is soldered on to) against each leg of the resistor.
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 06:27 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

So why do you report the reading on pin 2 as:
"gnd to pin 2 is more than 20Mohm or is error measure" Check the solder connection between pin 2 and that resistor (R305), it sounds like you do not...
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 06:21 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

"gnd to pin 2 is more than 20Mohm or is error measure" That is CS pin where the <1 Ohm Source resistance is connected to, so that reading is not correct. I thought you had already verify that the...
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 06:18 PM
Replies: 18
Views: 112
Posted By budm
Re: Hitachi LE55A6R9A, individual LED SPECS?

That is good LED tester for testing the Vf at low current (30mA). It will give idea if you have open circuit in the LED string or not. It will also light up LED string that has some shorted out...
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 05:56 PM
Replies: 18
Views: 112
Posted By budm
Re: Hitachi LE55A6R9A, individual LED SPECS?

http://www.shopjimmy.com/hitachi-lb55061-replacement-led-strips-12-strips.htm

You will have to remove the old LED to look at the solder pad foot print and also check the Voltage of the working...
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 05:52 PM
Replies: 18
Views: 112
Posted By budm
Re: Hitachi LE55A6R9A, individual LED SPECS?

LCD panel model number?
C550F15-E6-H?
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 05:51 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

OK. I have a feeling the component connected to the IC may be damaged at this point.
So I need the resistance reading of all the pins against GND pin.
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 05:48 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

I expect in >10K range.
Did the old IC blow up or what?
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 05:20 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

That is quite low resistance on the VCC pin, it should be in a lot higher than that.
You tested that without TV plugged into the AC outlet, right?

How about this?
"I changed 3br1565jf ... but I...
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 05:17 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

Side notes about this power supply board per page 40, it indicates that without main board connected the SMPS will turn on automatically, I hope that is the correct information. If it is true once we...
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 05:13 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

Please see post 38.
We need to get the drive circuit working first.

I still need an answer to this question: "I changed 3br1565jf ... but I had a short circuit after the soldering". What is...
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 05:03 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

That is what as expected and I explained.
You need to tell me what shorted out after soldering? also read my last post 38.
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 05:02 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

Your reported Voltage reading on the STBY SMPS IC:
3BR1565
pin 1 drain - 327v
pin2 cs - 0V
pin3 BA - 0,1v
pin 4 VCC - 0,5V
pin6 fb - 0,1v

The reading of 0V on the VCC pin indicating the...
Forum: Troubleshooting TVs and Video Sources 07-14-2018, 04:43 PM
Replies: 62
Views: 319
Posted By budm
Re: Lg 50pj550 no STBY light

BTW, I already see error in the training manual. I.E. page 35, 36, it shows the DC V on the fuse F302 (for protection if there is short circuit in the STBY section) for the standby power supply to be...
Showing results 1 to 25 of 500

 
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