Tip & How-To about Televison & Video

Basic LCD, Plasma, CRT, TV troubleshooting steps.

•Define Look at the symptom carefully and determine what circuits could be causingthe failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric materialand give off a distinct odor. Frequency of power supplies will change with the load, or listen for say a relay closing etc. Observation of the front Power LED may give some clues.
•Localize After carefully checking the symptom and determining the circuits to bechecked and after giving a thorough examination using your senses the first check shouldalways be the DC Supply Voltages to those circuits under test. Always confirm the suppliesare not only the proper level but be sure they are noise free. If the supplies are missing checkthe resistance for possible short circuits.
•Isolate To further isolate the failure, check for the proper waveforms with theOscilloscope to make a final determination of the failure. Look for correct Amplitude Phasingand Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes“glitches” or “road bumps” will be an indication of an imminent failure.
•Correct The final step is to correct the problem. Be careful of ESD and make sure tocheck the DC Supplies for proper levels. Make all necessary adjustments and lastly alwaysperform a Safety AC Leakage Test before returning the product back to the Customer.

Posted by on

Televison & Video Logo

Related Topics:

Related Questions:

1 Answer

It showing code 41. Generator field not switching properley.


This trouble code sets when the Powertrain Control Module (PCM) tries to regulate the generator field with no result during monitoring.
The PCM tries to maintain a system voltage between 12.9 volts and 15.0 volts. The voltage determined by the PCM as the final goal for the charging system is called "control" voltage. This control voltage is determined from the battery temperature sensor for ambient sensor and the sensed voltage system voltage at PCM pin #11.
The control voltage is compared to the sensed voltage continuously during running. If the sensed voltage is less than the control voltage, the PCM will supply more ground to the field circuit. If the sensed voltage is more than the control voltage, the PCM will supply less ground to the field circuit.
There are three possible causes for this, the field driver circuit open or shorted, there is an alternator internal open or short os a PCM failure

Jun 04, 2015 | Cars & Trucks

1 Answer

does a penguin substitute hearing for some other sense??


No, hearing is important for penguins to recognize other penguins. How else should he be able to find his partner or chick back in the colony. From the time they hatch, chicks mark the sound of the voices of their parents. So there can't be mistakes when the adult birds return from sea to feed their young. Finding a partner back is also based on the sound of the voice.

Sight is also important, as they need to see equally well on land and under water.

Feb 11, 2015 | Ask.com Computers & Internet

2 Answers

What is code P1115


Hi Betty:
DTC P1115 - Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage

The Engine Coolant Temperature (ECT) sensor contains a semiconductor device which changes resistance based on temperature (a thermistor). The ECT sensor mounts in the left bank cylinder head near the front of the engine. The ECT sensor has a signal circuit and a ground circuit. The PCM applies a voltage (about 5.0 volts) on the signal circuit to the sensor. The PCM monitors changes in this voltage caused by changes in the resistance of the sensor in order to determine the engine coolant temperature.

When the engine coolant is cold, the sensor (thermistor) resistance is high, and the PCMs signal voltage is only pulled down a small amount through the sensor to ground. The PCM senses a high signal voltage (low temperature). When the engine coolant is warm, the sensor resistance is low, and the signal voltage is pulled down a greater amount. This causes the PCM to sense a low signal voltage (high temperature).

When the PCM senses a signal voltage higher than the normal operating range of the sensor, this DTC sets.

12_2_2011_1_41_39_am.gif

Zoom Image Link: boggs/DTC%20P1115_files/image002

Conditions for Setting the DTC
Engine operates longer than 60 seconds.

Conditions for Setting the DTC
The engine coolant temperature is less than -35 C degrees (-31 F) for less than a second.

Action Taken When the DTC Sets
The PCM stores the DTC information into memory when the diagnostic runs and fails.
The malfunction indicator lamp (MIL) will not illuminate.
The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records.

Conditions for Clearing the DTC
A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
Use a scan tool in order to clear the DTC.

Diagnostic Aids
Electromagnetic interference (EMI) can cause an intermittent DTC. Inspect the related circuits for being too close to secondary ignition wires and the generator.
If the engine sat overnight, the engine coolant temperature and intake air temperature values should display within a few degrees of each other. If the temperatures are not within 3 C degrees (5 F degrees), refer to Temperature vs Resistance .

For an intermittent, refer to Symptoms .

Test Description
The numbers below refer to the step numbers on the diagnostic table.
If DTC P0118 failed this ignition, this indicates a hard failure is present. When a hard failure is present, both the hard and intermittent DTCs set.

When moving related connectors, visually/physically inspect connectors for the following:
Poor mating of the connector halves or a terminal not fully seated in the connector body (backed out).
Improperly formed or damaged terminals. Carefully reformed or replaced all connector terminals in the related circuits in order to insure proper terminal contact tension.
Poor terminal to wire connection. Inspect for poor crimps, crimping over wire insulation rather than the wire.
Dirt or corrosion on the terminals. Inspect the connector seals for being there and for being damaged.

When moving the related wiring harnesses, visually/physically inspect the wiring for the following:
Wire insulation that is rubbed through, causing an intermittent short.
Wiring broken inside the insulation.

Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed. For any test that requires probing the PCM or component harness connectors, use the Connector Test Adapter Kit J 35616-A . Using this kit prevents any damage to the harness connector terminals.

Keep us updated and feel free if you have some additional question. Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Nov 30, 2011 | 2000 Kia Sportage

2 Answers

I have a gas smell that seems to be coming from engine compartmen


you HAVE a gas leak, the best way for this problem is to use your senses of smell and sight.
Look for gas leaking at the same time smell for the strong smell of gas and locate the area.

Aug 11, 2009 | Toyota Camry Cars & Trucks

1 Answer

E125 screen failure symptoms


As a rule the failure of the LCD on a Casio pertains to greying out of the top 1/3 portion of the screen. The touch screen - the part that senses your stylus inputs i.e. taps, double taps, tap & hold / drag continue to work. Seems like the failure is not in the LCD but the fluorescent lamp at the top end of it. It could be the lamp itself or the inverter circuit. Have an experienced technician check the lamp out. It is not a very diffucult item to replace. Nor is there any desoldering / soldering involved.

Sep 06, 2005 | Casio Cassiopeia E-125 Pocket PC

Not finding what you are looking for?

443 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74383 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Electro Med Services...
Electro Med Services...

Level 3 Expert

6694 Answers

Are you a Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Loading...