Daewoo TV DTQ-2072 repeated blowing of fuse

Where can the problem be if the main fuse in the TV power supply blows fuse repeatedly?
This was a problem I have encountered with a Daewoo TV model# DTQ-2072. The fuse blows even when the IC regulator  STR-59041 has been replaced. To isolate the cause of the problem, I replaced the fuse again and disconnenected the PTC thermistor on board location RH02.
I plugged the set to AC outlet and powered up the set from standby. The picture and sound came up but the picture has color smears(dynamic misconvergence) on the sides of the screen - a result of disconnecting the thermistor which passes momentary current to the degaussing coil.
An ohmmeter check on the thermistor shows that it has developed a higher resistance. Opening the plastic case of the PTC thermistor revealed that the thermistor discs are burnt.
Replacing the PTC thermistor eliminated the  color stains on the picture and solved the problem of  blowing of fuse.

Hot /Cold Water Dispenser Parts and Functions

Because of the popularity of water from refilling stations which comes in plastic gallons the hot/cold water dispenser has become an indispensable appliance in the home today.
Let us know the important parts of the water dispenser and the function of each..

Chiller Tank

A stainless tank with an evaporator coil wound around its side for cooling the water. The evaporator coils are similar to the that used inside refrigerator freezers.

 

 

Heater Tank

A stainless enclosed tank with internal heaters for heating the water inside the tank and insulated with foam to conserve heat.

The heater tank includes an internal heater drawing at least 2 amperes of current to bring the water temperature up to boiling point.

Silicone Tubings

The water is channelled from the tanks to the dispenser faucets via silicone tubings. The silicone tubings are soft and flexible and resistant to hot and cold temperatures.

Heater Thermostat  

The heating tank thermostat's cutoff termperature is rated below near the boiling point of water which is 100 deg. centigrade. The thermostat will become open circuited when water inside the heating tank starts to boil. It is to prevent overheating which can damage the heating tank.

Water Tap/Valves 

 

Hot/Cold Water Dispenser On-site Repair Home Service in Metro Manila

Hotline: +63926.535.6848 (text/call)

Promac LCD-2051 power problem

Promac LCD TV model# LCD-2051 powers up from stand-by, sound comes up and backlight lights up but set goes back to stand-by before picture appears.
Found some bulging 47uF/16V capacitors on power supply board on location C3 and C8. Replacing the capacitors restored normal operation to the set.

Sony TV KV-21GMR1 power problem:SE115N error amp defect

Sony TV model# KV-21GMR1 is a dead set: no LED standby indicator light, +115V supply to horizontal output transistor measured only 27V and is pulsating.
The SMPS regulator IC STR-S6707 was replaced but still the +115v supply line is dropped.
Even when the horizontal output transistor is disconnected from the circuit the +115V supply will not increase.
An ohmmeter check on the SE115N error amplifier shows that it is internally open circuited.
Power was restored to the set when the SE115N was replaced.

Philips CTV 29PT2252/56A (L01.1A chassis)problem:intermittent pincushion distortion

This Philips TV model# 29PT2252/56A exhibited intermittent increase in picture width with pincushion distortion and blanking of picture.
A visual inspection of the printed circuit board reveals solder crack on pin 1 of pincushion transformer on board location 5465/5464/5463.
Resoldering of the cold solder on the pincushion transformer solved the problem of  intermittent picture width and pincushion distortion.

Microwave Oven Care and Maintenance Tips

Image via Wikipedia

• Do not load more than the kilogram capacity rating of the microwave oven. It will put mechanical and electrical stress on both the turntable motor and the magnetron that heats the food.
• As much as possible put a cover on the food container when cooking to prevent food splashes to the oven cabinet and walling. Food splashes when heated burns and emits smoke and can damage the paint and metal of the oven cabinet.
• Clean the both the interior and exterior of the oven cabinet regularly to prevent corrosion and rust.
• Turn off or cancel the program timer first before opening the oven door. Sudden opening of oven door could blow the safety fuse.
• Unplug the microwave oven after use particularly models that use an electronic control panel which has digital display and electronic circuitry. These electronic parts are highly susceptible to damage caused by voltage spikes, power fluctuations and lightning strikes.
• Do not heat liquids using the microwave oven for more than 2 minutes. Do not use the microwave oven to boil water as this is a potential safety hazard.
• Do not run the microwave oven without any food or liquid to absorb the magnetron's energy. Energy emitted by the magnetron can feed back to itself and cause damage to magnetron's internal parts.
• Use microwavable food containers which uses plastic, ceramic or glass material. Never use metal containers or aluminum foil as microwave energy bounces off metallic materials and cause uneven heating and cooking of food.  

Related articles

• Use Your Microwave Safely (everydayhealth.com)
• Smart Microwave Maintenance Advice (mydecorarticles.com)

Philips TV Service Mode

To access service mode in a Philips TV, press on the remote control keys:
0-6-2-5-9-6-OSD(i+) or
0-6-2-5-9-6-MENU.

The service mode will allow you to adjust picture Geometry and White Tone via remote.

You can also adjust the option codes to configure drivers for the hardware components particularly the I2C devices..