Question about DBX 1231 Home Equalizer

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Feeds back withi itself

Nothig more to say, it goes into oscillation turns all level lights on. I have had this problem on several of these at several locations. have you ever heard of this ?

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Regulation zeners are shorted

Posted on Sep 20, 2014

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Why does it shut off completely and has to be manually turned back on?


Probably a safety feature to keep it from getting too hot. temperatures above a certain level could easily start a fire.
This unit has a temperature control with will turn it of after a certain temperature is reached it also has a timer that will turn it off.
It might also be a malfunction in one of those controls.

Dec 19, 2015 | Optimus H-4501 14" Oscillating Pedestal...

1 Answer

Refrigerator turns itself off for a while (lights out and compressor too) then after a while it goes back on by itself. It's been doing that for 6 months now.


Probably just a bad light switch. There are several posts on here that tell you how to replace the light switch, it's pretty easy and the switch is only about $20 from subzero. Good Luck!

Sep 19, 2013 | Sub-Zero Refrigerators

3 Answers

I have a AL2671w LCD Acer TV ON OFF switching


looks like the same problem i have with my 32" acer tv, it seems to be a problem of acer TVs get someone to check the capacitors in the power supply.... I think one might be bad.

Dec 05, 2009 | Acer Televison & Video

2 Answers

I'm running my RV 115V 60hz a/c while connected to a 4,000 watt gas generator, with no other loads. The A/C has constant cold air, but seems to have an oscillating sound. The trailer is not completely...


this is normal, do not worry that harmonic vibration type noise just tells me that the unit has a full freon charge and is running great, sit back and enjoy

Aug 10, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Tv shuts itself off randomly


hi

you have defective power oscillation in power section
this needs to diagnose for a qualified technician

Thanks!

Feb 25, 2009 | Sony FD Trinitron WEGA KV-32HS510 32" TV

1 Answer

Turning on shuts off red light starts blinking


Hi

You have defective Oscillation Circuit maybe you have leak small parts like capacitors and resistors. and also the HOT Area.

Thanks!

Dec 04, 2008 | Televison & Video

1 Answer

Screen goes black,with sound


No picture sound ok
Note 1 a Raster is the name for a screen made of lines of brightness
Note 2, A Blank raster has no snow or picture, its just a lit up screen

Sound ok but no raster.
First increase tube's first anode voltage (knob on the loptx) to see if the screen is just too dark.
if after you have turned up the bottom knob on the loptx, there is still no brightness,check, for crt heaters, and EHT 25kv and focus voltage (2kv) and A1's/Screen/G2 voltage is 300-600v.
and check for field timebase (height), the next thing to check is the sandcastle pulse.
If it's present, colour decoder chip is probably faulty or lacks supply from the LT regulators.

NO LINE DRIVE If it's absent,check the line driver, locate the loptr(big and usually has heat sink).
follow the print from the base back to the driver stage , where you will usually find a tiny transformer with 4/5 pins
resolder it, even if it looks good,then with power on, check for voltage on all its pins, 2 should have LT(12v to 32v) or HT (90v to 150v), if not there follow the print back and look for either a transistor(linedrivetr), or the feed voltage line (maybe regulated),
If the voltage is ok on two of the driver transformer(drvtx) legs, the look from the base of the driver transistor to locate the timebase chip
and check round its pins for a 12v supply line, if there ,replace the timebase generator chip

Method of testing line drive, remove line output transistor, and connect a normal red led, across the B/E (longest leg to base), and when you power up the led should lite up.


Trace the pcb back from the BASE leg to find the line driver stage,
Its usually a very small transformer (4/5 legs) and a transistor connected to it,
The driver transformer legs(pins) will be two with voltage and two without
The two with power will either be about HT level (110v=145v) or about LT level(25v)
If not then trace back and look for a biggish 3w resistor.
linedrv.jpg
If the voltages are correct the look for line pulses from the Timebase oscillator chip to the base (some overvolts protection circuits remove pulses if ht is too high).
If the voltage is low and the feed resistor is getting hot then check the base of the driver transistor if its HI over 0.5V then its being turned on by the timebase oscillator chip (protection ?)
If the voltage is zero check the feed resistor
If all seems normal check that 12v is getting to the timebase oscillator chip (IC) (12v regulator?)
Method of testing line drive, remove line output transistor, and connect a normal red led, across the B/E (longest leg to base), and when you power up the led should lite up.

Hope it may help you;
Regards,
VOTIT

Oct 10, 2008 | Philips 42FD9954 42 in. Plasma HDTV

3 Answers

Mitsubishi TV problem


your unit is lack of oscillation! thats why your unit turn off it self! maybe change value of resistors or capacitors... or maybe lost contact to oscillation circuit....

Sep 26, 2007 | Televison & Video

1 Answer

The flashibg red light


John, I do not know of a code, but it is a good idea in the design to have several goes at starting a circuit, before completely shutting it down. Oscillators are supposed to self start due to noise generated. Some electronic circuits require a reset pulse to be generated before the start up is allowed. The reset circuit may not be generated if the set is turned on again too soon, so it will stay in standby. This may normally be a few minutes to 30 minutes so it seems something in your set is faulty and could get worse. Try a test run with the back off and clean it out of dust with a long brush to keep it cooler. Make sure little fingers cannot get near it. Look to see if anything is obviously overheating.

Oct 21, 2006 | Thomson 24WK25U 24" TV

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