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Search: Posts Made By: R_J
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 02:26 PM
Replies: 6
Views: 60
Posted By R_J
Re: Corsair RM750x help ID blown components

It may be a SCK054 ntc. Measure the original's diameter.
Forum: Troubleshooting TVs and Video Sources Yesterday, 01:08 PM
Replies: 28
Views: 262
Posted By R_J
Re: Small RCA TV white screen

Transformers only work with AC they do not pass or convert DC (the diodes then convert the ac to dc)
The mosfet you replaced switches the raw 12volt input across the pimary of the transformer at...
Forum: Troubleshooting TVs and Video Sources 07-01-2022, 08:33 PM
Replies: 28
Views: 262
Posted By R_J
Re: Small RCA TV white screen

That will work, You should have mentioned you got the mosfet from Digikey earlier as there is also a 100ma transistor with the marking XF, which would not work.

So good to here you have it...
Forum: Troubleshooting TVs and Video Sources 07-01-2022, 07:40 PM
Replies: 28
Views: 262
Posted By R_J
Re: Small RCA TV white screen

Digikey has the AO3420 which is a 6 amp version that should be ok. They also have a RUR040N02TL 4 amp version.
Forum: Troubleshooting TVs and Video Sources 07-01-2022, 06:32 PM
Replies: 9
Views: 70
Posted By R_J
Re: Sony XBR-65X850E power supply board diode replacement

All four diodes are the same, they are setup as a bridge.

I believe the S750 is a typ0, should be D750
Forum: Troubleshooting Audio Equipment 06-30-2022, 10:28 PM
Replies: 3
Views: 591
Posted By R_J
Re: Philips HTL2160 Soundbar bad audio crossover fix

Click on the link "service manual" in the post.
Forum: Troubleshooting TVs and Video Sources 06-30-2022, 09:12 PM
Replies: 28
Views: 262
Posted By R_J
Re: Small RCA TV white screen

The circuit is not likely to work when you replace a FDN339AN mosfet with a RN1406 transistor (Marked XF)!
The smps ic operates at a min freq. of 50khz and up
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 06-30-2022, 08:53 PM
Replies: 78
Views: 50,059
Posted By R_J
Re: List of pin compatible Laptop ICs

RT6543agqw
RT3612ebgqw
Forum: Troubleshooting TVs and Video Sources 06-30-2022, 06:36 PM
Replies: 28
Views: 262
Posted By R_J
Re: Small RCA TV white screen

Why suspect the transformer? the transistor you installed is wrong, the source resistors should be 1.5Ω not 10Ω and circuit is not going to work with wrong parts installed, and could cause even more...
Forum: Troubleshooting TVs and Video Sources 06-30-2022, 12:20 PM
Replies: 11
Views: 102
Posted By R_J
Re: Panasonic TX-L32E5E doesnt turn on.

Does the power led flash a code?
Forum: General Electronics Technical Discussion 06-30-2022, 10:55 AM
Replies: 6
Views: 101
Posted By R_J
Re: Anyone know of an alternative for a R10E2662-2 DPDT relay

Maybe this? R10-E2Y2-V52 (Digikey) 6v coil (operates at 4.5v) It has PCB terminals but might work?
Forum: Troubleshooting TVs and Video Sources 06-29-2022, 07:52 PM
Replies: 28
Views: 262
Posted By R_J
Re: Small RCA TV white screen

If it was a sot23-3 marked 339, (in picture 5) it was a FDN339AN N-Channel mosfet. How did you find the correct values of the resistors, if they were burnt? What values did you use? They seem to be...
Forum: Troubleshooting TVs and Video Sources 06-29-2022, 03:24 PM
Replies: 28
Views: 262
Posted By R_J
Re: Small RCA TV white screen

The plug in picture four looks crooked, make sure it is seated properly. (the flat cable does not just pull out and get pushed back in, the latch must be released) What resistors did you replace that...
Forum: Troubleshooting Audio Equipment 06-29-2022, 12:51 PM
Replies: 11
Views: 107
Posted By R_J
Re: Sony CFS-B11 Radio cassette boom box

Did you have this problem before or after you disassembled the switches?
Forum: Troubleshooting Audio Equipment 06-29-2022, 12:43 PM
Replies: 11
Views: 107
Posted By R_J
Re: Sony CFS-B11 Radio cassette boom box

The supply to IC301 should be 7.6 volts on pin 1, Pin 18 is a 4.8v output that is switched by the ic, This output controls the base of Q303 which supplies 4.1 volts to the tuner board, that's why...
Forum: Troubleshooting TVs and Video Sources 06-29-2022, 11:59 AM
Replies: 5
Views: 132
Posted By R_J
Re: Samsung PN58C550 58" Plasma PSU BN44-00331A

I suspect the bridge rectifiers are ok but you likely have a shorted modfet in either the main or pfc circuits.
There are also two MOV's VX801S and VX803S, what is the resistance across each and do...
Forum: Troubleshooting TVs and Video Sources 06-29-2022, 11:07 AM
Replies: 5
Views: 132
Posted By R_J
Re: Samsung PN58C550 58" Plasma PSU BN44-00331A

The relay will NOT be the cause of the short causing the fuse to blow. The relay is just a controlled switch. Check the two bridge rectifiers for shorted diodes, then check if there is a short across...
Forum: Troubleshooting Audio Equipment 06-28-2022, 10:21 AM
Replies: 9
Views: 176
Posted By R_J
Re: Intimidation Professional sub advice please

There likely is no protection circuit. I suspect the output mosfets could also be bad, I see what looks like a lead trimming or solder splash on the mosfet lead in the lower left of your picture.
Forum: General Electronics Technical Discussion 06-25-2022, 04:11 PM
Replies: 11
Views: 192
Posted By R_J
Re: Conversion of Anolog Voltmeter into Ammeter

You would need to remove the 3k in series and then use a shunt across the movement.

As the meter is now, 3 volts gives FSD, with a resistance of 3500Ω the current through the movement is about...
Forum: Troubleshooting TVs and Video Sources 06-25-2022, 12:12 PM
Replies: 7
Views: 187
Posted By R_J
Re: Bn44-00623B pfc mosfet very hot

How was QP802C shorted? was it shorted D~G ? if it was you may have damaged the gate drive components, likely a shorted diode. Also check if there is a zener diode off the IS pin of the drive ic that...
Forum: Troubleshooting Audio Equipment 06-25-2022, 11:24 AM
Replies: 9
Views: 176
Posted By R_J
Re: Intimidation Professional sub advice please

Most of the Blastking drivers seem to be 8Ω
Forum: General Electronics Technical Discussion 06-25-2022, 10:23 AM
Replies: 11
Views: 192
Posted By R_J
Re: Conversion of Anolog Voltmeter into Ammeter

That is battery tester and likely has an internal load resistor to load the battery to get a proper reading when testing 1.5v batteries. It likely won't move with .3v
With your current setup 12v, 8Ω...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-24-2022, 07:40 PM
Replies: 15
Views: 213
Posted By R_J
Re: Reebok one GT40s treadmill lift motor runs at switch on

Have you re assembled the treadmill to see if it will self calibrate? Have you tried the calibration procedure for this model?
Forum: Troubleshooting Power Supplies and Power Supply Design 06-24-2022, 02:54 PM
Replies: 15
Views: 213
Posted By R_J
Re: Reebok one GT40s treadmill lift motor runs at switch on

If you disconnected the thread end of the actuator, is it just spinning or does it move in or out? The motor likely runs until it sees the down stop position.
Forum: Troubleshooting Game Consoles & Other Weird Devices 06-24-2022, 12:54 PM
Replies: 17
Views: 268
Posted By R_J
Re: Graco ST MAX II 495 PC PRO , paint spray machine help

The bat54 voltage is a bit low, go for something around 100v
Showing results 1 to 25 of 500

 
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