Question about Uniden CLX485 Cordless Phone

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Power supply problem

Hi due to high input voltage certain parts are damaged ,particularly 8501 8pin IC so tell me how to solve

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THERE IS NO WAY TO SOLVE, ITS DAMAGED INSIDE AND THERE IS NO WAY OF REPAIRING THE UNIT.

Posted on Sep 07, 2009

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What is a opamp


An opamp is an operational amplifer. The OPA134 is a single amplifier with differential inputs. The best way to describe this IC is that it is an ideal amplifier with infinite gain, with high input impedance and low output impedance making it both a voltage and current amplifier. The output signal is divided with resistors and provides feedback to the minus input to inject negative feedback. The ratio of this feedback basically determines the final gain. The input signal may go to the positive input for a non-inverting amplifier or to the negative input for an inverting amplifier. Roughly the voltage gain in dB will be 20 x log of Vout/Vin. There is a difference in the gain of 1 between inverting and non-inverting for accuracy sake, but that is the basics.
This particular part is very high quality in performance and should be replaced with the equivalent part or one from Burr-Brown. The power supply is typically +/- rails and ground is usually the virtual point between the split supplies representing 0V. Sometimes the input signal will not be referenced to ground and will be fed to both the plus and minus inputs which will be balanced (impedance wise) to form a differential input that rejects common signals such as noise. Pretty cool device, I couldn't live without them. OPA134 Precision Amplifier Operational Amplifier Op Amp Technical documents

Jan 10, 2014 | Texas Instruments OPA134PA IC, AUDIO,...

1 Answer

MX-50X3 TV BLINKS the show off and on for 30-40 minutes tell its warmed up i guess. what should i replace


Hi,

It's the problem of overheating in the power supply board of the TV.on the power supply board of the TV there are few capacitors and IC.any of this IC is got short or may be weak.so due to this when you start the TV the current passes from electric outlet to the power supply board of TV.but when the current passes from that weak/faulty part at that time current gets stopped or slow and the board overheats and TV shuts off. this is a common problem faced by many other users too.the possible option to solve this issue is to check the power supply board by a meter and continuity tester and replace the faulty component on the board which is short due to which power supply board is getting overheated.its bit technical job but yes its not at all a costly repair to do or get it done by the technician. for required parts it can be easily available from local electronic shop
Hope this will help in solving the problem, do take care in opening the back cover of the television because it contains high voltages.......

May 12, 2011 | Maxent MX-50X3 50 in. HD-Ready Plasma...

2 Answers

MY ALESIS DM5 WAS PLUGGED TO 220V AND AFTER A WHILE STOP WORKING ( IT IS FOR 110 V ) IS ANY FUSE I CAN REPLACE?


Hi pcruzx,
Sometimes replacing the fuse alone with exact voltage and ampere ratings will cure the problem(you're lucky) but not all. Sometimes further damaged gone to other parts most especially the voltage regulator transistor/IC (mounted in heat sink) and the opened the fusible resistor in line with the supply(B+).
First check the fuse, for sure it was already blown. If you've replaced the fuse and immediately blew again after powering on the unit, this was an indication of shorted parts near the AC line. Click this LINK for more info.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

May 01, 2011 | Alesis Dm5 Drum Module 18 Bit

1 Answer

Model 27LCDB03B-simply appears to be "dead" won't power up-not the fuse


Hello Chris, Hi, your TV's power supply section is not functioning properly. If the fuse is in good shape, then the auxiliary power section of the power supply is not functioning, this section powers the switching oscillator and IC that sends the pulse to the switching element like power transistors to create a main secondary voltage. the main secondary voltage is the circuit that produces all voltage needed source by the TV. what you can do if you are up to it.
A. Visualize any bulging capacitors, replace them. B. Measure the voltage across the following section in particular order so we can find the faulty parts.
  1. the AC input on the Power supply board. (none means open switch or power cable)
  2. the AC after the line filter circuit. (none means open line filter)
  3. the DC on the filter capacitor. (none means problem on the rectifier)
  4. then the AC on the switching element or input on the main transformer. (most likely you won't have any voltage reading hear.)if you do have continue.... (none means you scratch your head, this is the hardest part) check all low value resistors, high wattage resistors open or shorted diodes.
  5. the dc on the secondary filter capacitors.
If not have this checked by a technician, its to complicated for you.

Mar 12, 2011 | Thomson Televison & Video

2 Answers

Tv wont turn on just get a red blinking light on front tried to unplu but wont work still


Hi,

Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

Hope this help in solving the problem

Sep 30, 2010 | RCA Televison & Video

1 Answer

The entire left side of the screen has dissapeared and the right side is almost unviewable.


Hello, This require you to open the back cover of the television set also a multimeter to test faulty component.. The following applies if the part of the picture is missing but not otherwise squashed or distorted. For example, 85% is missing but the portion still visible is normal size.
Since the size of the picture fragment is correct but 85% is missing, my first thought would be to check waveforms going into the vertical output stage. The supply voltage is probably correct since that often determines the size. It almost sounds like the waveform rather than being mostly on (active video) and off for the short blanking period is somehow only on during the last part of the active video thus giving you just the bottom of the picture. If there is a vertical output IC, it may be defective or the blanking input to it may be corrupted. The problem may be as far back as the sync separator. Then again who knows, maybe wait for the schematics.
CAUTION: To prevent damage to the CRT phosphors, immediately turn down the brightness so the line is just barely visible. If the user controls do not have enough range, you will have to locate and adjust the master brightness or screen/G2 pots.
Since you have high voltage, the horizontal deflection circuits are almost certainly working (unless there is a separate high voltage power supply - almost unheard of in modern TVs and very uncommon in all but the most expensive monitors).
Check for bad solder connections between the main board and the deflection yoke. Could also be a bad horizontal coil in the yoke, linearity coil, etc. There is not that much to go bad based on these symptoms assuming the high voltage and the horizontal deflection use the same flyback. It is almost certainly not an IC or transistor that is bad.

May 20, 2010 | LG 42LC2D 42 in. LCD HDTV

1 Answer

Too dark and the red and green color too much..


Hello,
first to check waveforms going into the vertical output stage. The supply voltage is probably correct since that often determines the size. It almost sounds like the waveform rather than being mostly on (active video) and off for the short blanking period is somehow only on during the last part of the active video thus giving you just the bottom of the picture. If there is a vertical output IC, it may be defective or the blanking input to it may be corrupted. The problem may be as far back as the sync separator. Then again who knows, maybe wait for the schematics. CAUTION: To prevent damage to the CRT phosphors, immediately turn down the brightness so the line is just barely visible. If the user controls do not have enough range, you will have to locate and adjust the master brightness or screen/G2 pots.
Since you have high voltage, the horizontal deflection circuits are almost certainly working (unless there is a separate high voltage power supply - almost unheard of in modern TVs and very uncommon in all but the most expensive monitors).
Check for bad solder connections between the main board and the deflection yoke. Could also be a bad horizontal coil in the yoke, linearity coil, etc. There is not that much to go bad based on these symptoms assuming the high voltage and the horizontal deflection use the same flyback. It is almost certainly not an IC or transistor that is bad.

May 16, 2010 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

110v lcd tv was plugged to 22ov outlet


Hello nik286, hi, check first the label at the back of the TV, look for a voltage input something like a 90V-240V, if you see this, its an autovolt system, this type of power supply input is standard nowadays. Assuming your asking what would be damage, this could be anything from the fuse, thermal resistor, rectifier diodes, and the regulator IC of the power supply board.

Apr 12, 2010 | Sansui 19 in. LCD TV

1 Answer

JVC AV-36D502: Input #3 doesn't work


Good day sir, its a different issue, about the capacitor, for as long as your replacement part is correct, it will work, now, there are several things you should check, the I/O device that controls the inputs of the TV, usually an IC, check your schematic diagram to trace the fault. check also the line from the input 3 to the controller IC on your diagram. Measure the voltage across the IC Vcc to ground if the IC is getting the right power, Low voltage can be cause by faulty capacitors, on the power supply line, or the IC itself is faulty, Circuit analysis and voltage measurements are needed to trace the faulty part. hope this helps thanks.

Oct 23, 2009 | JVC AV-36D502 36" TV

3 Answers

Have sound but no picture. lcd tv.


If an LCD TV has sound but no picture do the following:

Use the source button to ensure that source is not set to the wrong input.

Try unplugging power cord for ten minutes, to ensure it is not a setting problem.

Check all the video cables at the back of TV.

Check Light /Color settings.

If problem persist and does not depend on external receiver or settings, then it is likely an internal fault.

If it has sound but no picture then one of the following parts is faulty, and must be tested and replaced:

Theinverter is the high voltage board that provides variable power to thebacklight lamp. This is the most common. When inverter is faulty youcan get no picture, or a very dim picture that can only be seen bypointing a torch light with a 45 degree angle on the LCD surface fromvery near distance.
The inverter must be tested by reading voltages with a multimeter.

The LCD ribbon cable/LCD display and connectors.
Thisis quite uncommon, but happens. If the TV had been hit or moved the LCDcable may have slipped out, or the LCD connector may be damaged.

The LCD controller board.
Thisis the board that controls the video signal, it is difficult to test,as there is need to read determined values on IC pins. To test thisboard you need to purchase a service manual and follow thetroubleshooting diagrams on service manual.

Input/Output Signal boards.
This are the boards where youconnect the video and audio cables, if a signal board is defective,then you may get no picture on particular inputs located on faultyboard.

If under warranty contact the manufacturer ringing the number on the user manual.

If you want to repair at your own expenses, just locate any good qualified repairer.

If you want to DIY you find parts here,

All: Appliance parts, electronics parts & more from PartStore.com

Encompass Parts Distribution

LCD/Plasma Electronic Replacement Parts: Plasma & LCD TVs, Appliances |

Jul 20, 2009 | Televison & Video

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