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Can i get the resistors list in the power supply

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RadioShack has all types of capacitors and resistors. I just changed a few this evening for my LG tv. Easy to change out too.

Posted on Oct 16, 2010

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Posted on Jan 02, 2017

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Missing resistor on main power board resistor no r7637


Can you tell me where is the area to locate R7637? I have a power supply but can't find that part.
The service manual doesn't have a part list to find that resistor.

Aug 28, 2015 | Sharp AQUOS LC-32D44U 32 in. LCD TV

Tip

Basic Standard TV Troubleshooting Techniques.


When you turn your television on and get nothing but a clicking sound you could have almost anything wrong with it.

The two most likely places to look are the high voltage section and the low voltage power supply. In order I will explain what to check to try to resolve the problem.

First, is the standby light blinking in some sort of pattern? If so, count the number of times it blinks between long pauses. If it is blinking in a patten, this is an error code, and can be helpful in diagnosing the problem.

Depending on the manufacturer the blinking pattern will mean different things. Error code lists are available by googling "(manufacturer) tv error codes". Proceed from here based on the information provided by the error code list.

If your set has no blinking lights proceed by unplugging and looking at the mainboard for burned resistors or bulging electrolytic capacitors.

Electrolytics look like little cans, with shiny ends and are generally black, grey or blue. They have a positive and negative lead so be careful when replacing to get the polarity correct.

If they are bulging replace them. Also replace any bad resistors found. Resistors must be replaced with similar units and cannot be derated.

Resolder any bad connections on the low voltage power supply and certainly the high voltage power supply. That would be most or all of them.

Finding no charred resistors or bulging caps, and after resoldering all connections, your unit still does not work, check the horizontal output transistor for failure.

Using a DMM on diode check, check the transistor out of circuit for shorts/opens between any two leads. A good unit should have somewhere between 500 and 1000 ohms one way and infinity when the leads are reversed. Only two lead configurations will show conductivity. One set of leads should show infinite resistance both ways. If the transistor checks bad, replace it and the flyback. If you are not sure about the results replace it. Check all resistors and diodes in the HV circuit and replace any suspicious units.

If the horizontal output transistor checks OK, check all semis in the LV power supply. Replace any bad units found and check all associated resistors and replace as necessary.

If both the HV and LV sections check OK, remove the circuit board from the CRT and try the unit. If it runs your CRT is bad and needs replaced. If it does not run your problem is elsewhere.

Working one section at a time, remove and isolate any remaining sections while attempting to turn unit on. If unit works with a particular section disconnected, your problem is in that section and you will need to do normal troubleshooting procedure, listed above, on the section in question.

If after all the above procedures are tried, and your unit still isn't working, you may have to replace an entire board. These days most boards are relatively inexpensive. The most likely board would be the LV power supply which usually contains the HV power supply also.

Any parts or boards needed can be ordered at http://www.encompass.com or http://www.shopjimmy.com .

Good luck with your troubleshooting and be careful while inside the set especially near the High Voltage second anode where it connects to the CRT.

Thanks for using FixYa and the great rating. Please consider a testimonial.

hardrocko

on Mar 27, 2010 | Televison & Video

1 Answer

What is the value of the resistor marked R338 in the power supply of Peavey pv 1500 2 x 750w power amp?


i have bit of the problem, i cannot find anywhere on this schematic resistor with 338 value, go to this page:
http://www.schematicsunlimited.com/p/peavey/peavey-pv1500-amplifier-schematic

i have another listing which is for pure power supply only:
http://exodus.poly.edu/~kurt/manuals/manuals/Other/POWER%20DESIGNS%20TB343A%20Instruction.pdf

this is giving me value, if i am correct, your resistor will be metal film 100ohm +/-1% 1w

you can re-calculate if this is correct value.

hope this will help you, do not forget to vote

Jan 26, 2015 | Peavey pv 1500 2 x 750w power amp

2 Answers

Display light for totals on cyclone pin ball machine don't display


Assuming the game is playing, but just no displays lit.

1. Check fuses on power supply board for a blown fuse. Sometimes the fuse clips will crack and not provide a snug hold to the fuse.

2. Look for bad (cracked) solder joints on the connector pins on power supply board.

3. There are two 39K resistors on the power supply board that go bad (usually go open circuit). One of those resistors is for the +100 volts and the other one is for the -100 volts. All it takes is one of those resistors to go bad and the displays will be blank. Originals were rated at a half watt, but it is suggested to replace with a higher wattage value, say 39k at 2 watts. If you find only one bad 39k resistor, replace the other one too at the same time because that one will soon fail.

May 29, 2014 | Wurlitzer Jukebox CD Player

1 Answer

Power supply is only 12months old very little use. Was working fine but one day failed to turn on..its not overloaded its rated way,way above what my system should need. Being an auto electrician I thought...


Hi
This resistor is for overload its like a protection unit your system may Overload but you need a multimeter to test the Diodes and you might find that one of them is short this can cause the resistor to blown
you can find this resistor in High Voltage circuits
hope it will help

ecrdn@yahoo.com

Jack

Nov 02, 2010 | Thermaltake 700-Watt Power Supply

1 Answer

LG Flatron L1715SN, ANEUEP, SerialNumber: 508WAVK10943, no power


that's how switching power supplies trouble you...hint: put a bulb in series with the power cord, in this case you will avoid burning resistors or fuses. A short or overloaded circuit will indicate a bright light...get it? try to google also for troubleshooting switch-mode power supplies (SMPS)...did you check the power regulator IC? hope this will help you

Aug 17, 2009 | Televison & Video

1 Answer

Bad power supply q301,q302 shorted


I'm going to guess that you have a Sony set based upon the circuit designations that you listed. If that is so, you really don't need the entire module. You will need to replace the transistors and a resistor. Possibly a cap or two will be required as well. Please post the model number and further details shall be provided.

Thanks,
Dan

Jul 03, 2008 | Televison & Video

2 Answers

Service shop


Is the power supply completely dead ? If so with this model of power supply its very common for the resistor 3318 on power supply to go out. Causing the power supply to completely die. Take out the resistor 3318 its a 470 Ohm 1W resistor. check it if it doesn't read around 430-530 Ohm Its gonna be bad ( most likely ith will read in the mega ohms. Replace with a 470 Ohm 2 W resistor. Also check power supply for cracks

Apr 29, 2008 | Philips 37PF7320A 37 in. HD-Ready LCD...

1 Answer

No power Up , No Sound , No picture


Requires careful, meticulous soldering of horiz drive circuit +
rebuild power supply.....requires four parts......Horiz out xistor,
two converter xistors and one resistor....would you like part list?

Nov 22, 2007 | Sony KV-32S45 32" TV

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