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I have an Insignia LCD 32", is it common to only get 3 volts dc on one pin only on the power supply board (6HA0112014)? I tried a board from River Valley Electronics and got the same thing. What are the chances that both boards were bad? I just received a black light inverter board (RDENC2287TPZA) and it is visibly bad. Any suggestions?

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That may be the stanby 3vdc for the main board, the main board will send out PS-ON signal when the power switch is activated which will turn on the rest of the power supply sections such as the 24vdc for the backlights inverter board and 12vd for main board, 5v for the logic circuits, etc. If the Inverter board has short cicruit, then it will cause the power supply to go into shutdown mode. You can disconnect the cable from the power supply to goes to the inverter board to see if you get the 24v, 12v to turn on.

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I have an Astec DS 1500-3-001 power supply that I want to use a a stand alone PS. What pins do I need to connect to get +12v DC output with 120 VAC Input.


Mike
I take it that this is a standard power supply out of a PC (switch mode)
These are a common connection point on any brand PC
Use a DC Voltmeter to find the Ground, +5 Volt & +12 volt wires to power your 3.5 inch Hard Drive. The 2.5" Hard Drives (laptop) has only Ground (Black) & +5 Volt.

Oct 30, 2014 | Computers & Internet

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I have an Insignia LCD 32", is it common to only get 3 volts dc on one pin only...


This is the basic guide that can be applied to most LCD flat panel TV.
By Bud Martin
First, try unplugging it from the outlet for about an hour to see if the TV will reset itself since the minute the TV is plugged into the wall, the power supply and processor will be running 24/7 and the EPROM can get corrupted by spikes and surges. Try using good quality surge suppressor to see if it will help if it happen often.
Look for burnt brown hot spots on the circuit boards, capacitors with leaking/bulging top or seals. Loose wires and connectors. Blown fuses.
Notes: We are dealing with high voltage that can kill you! so if you are not sure what you are doing, please have it fixed by the pro that has proper tools and safety equipment. Try to use GFI outlet and isolation transformer when work around the TV set and DO NOT DEFEAT THE GROUND PIN OF THE OUTLET/POWER CORD.

1) The power supply module (There are 4 regulated output voltages:- Standby 5vdc, switched 5vdc, 12~16vdc, and 24vdc).

The power supply converts the 120/230vac 50/60Hz into DC, then the high frequency (50~100kHz) switching circuits convert it back to AC but at high frequency which allows the power supply to use smaller and much lighter weight transformers (Ferrite core instead of heavy iron core), then this high frequency AC voltage is fed to the rectifier Diodes to get the DC output and filtered by DC filter capacitors that must have low ESR (Equivalent Series Resistance), if general purpose electrolytic caps are use, they will fail within a year or less due to high ESR.

The power supply has Standby 5vdc (5VSB, this is a MUST have before anything else will work, when this voltage is not present, there will be no any indicator light on the front panel) which is always on the minute the TV is plugged into the AC outlet, so it is on 24/7 and that is why the power supply will fail even though you may use the a TV not very often. It will see all the voltage spikes and surges 24/7.
This 5vdc is used to power the Processor and the Infrared remote receiver module which will be waiting for the command from the remote control or from the power switch, when the Power on command is received, the Processor will send the turn on signal (3.3~5vdc) to the power supply module (PSON pin) to the switch on the main 5vdc for the rest of the logic and Tuner circuits, 12~16vdc for the sound amplifiers (mostly Class D amplifier for efficiency and small size) and for the T-CON board (interface board between the LCD panel, some T-CON uses 5vdc, and the Logic board), and 24vdc for the Back lights inverter board (if there is no 24vdc then no back light).
Common failures:
Blown main AC fuse due to shorted out Diodes, transistors.
Bad capacitors leaking or bulging tops:
Shorted Diodes, transistors in the DC output side.

Testing the power supply output with dummy load:
24vdc testing: Disconnect the wires that go to the inverter board first. You can use two #1157 (using both Lo & Hi filaments by paralleling them at the base) car light bulbs connected in series so they can handle the 24vdc, this will put light load (about 70w) on the 24vdc output, the voltage out should be steady at 24vdc (+/-2v), if not, the power supply has regulation problem.
12vdc testing: disconnect the 12vdc TV load from the power supply board and attach one #1157 (using just the Hi filament), the 12vdc output should stay at 12v (+/-1v), if not, the power supply has regulation problem.

You should see the lamps go on when the TV power switch is ON and go OFF when the TV is powered OFF.

2) Main Logic board (It has Processor, Tuner, Sound Processor, Sources selector, Power amplifiers for speakers, interface port to the T-CON board for pictures).
This logic board sends out the turn on signals (3.3~5vdc) to turn on the rest of the Power supply module (Switched main 5vdc, 12~16vdc, and 24vdc), Inverter backlight ON (if no back light on command then there is no back lights),
Logic board supplies 5 or 12vdc to T-CON board B+ pin through switched transistor if T-CON board does not get the voltage from the logic board, you will get white/gray glowing screen without pictures.
Back lights Dimming (PWM) control signal.

3) Back lights Inverter board. Its job is to provide the drive voltage for the CCFL (Cold Cathode Fluorescent Lamp) to give white light for the screen.
This board is fed by the switched 24vdc (VBL) from the power supply module, it also get the Back lights on (BL on) control signal and the Dimming (Dim/PWM/) signal from the logic board. So for it to work, it needs 24vdc and the BL_ON signal.
Common failures:
Blown surface mounted fuses due to shorted transistors/ICs, Transformers.
Bad capacitors.

4) The T-CON (Timing Control or LCD controller) board (on the LCD panel assembly). It transfer the universal image signal of TTL and LVDS signal to specific TFT (Thin Film Transistor) LCD.
This is the interface board that talks to the Logic board and the LCD panel to produce pictures on the screen. White/gray glowing screen when it fails or not getting the voltage from the logic board (the 5 or 12vdc is supplied by switched transistor on the logic board). Notes: T-CON board is mounted under the metal cover shield.
Common failures:
Scrambled pictures, Lines, multiple pictures, color smears/blotches, rolling pictures after warm up.
Blown surface mounted fuse.
No pictures, very dark screen almost like there is no backlights.

5) LCD panel assembly to display pictures. The LCD pixels will block or unblock the back lights from the back of the panel to the front of the panel. This is the most expensive part of the TV, it will be more than the TV is worth.

As you can see, you must have all the above Voltages and signals for the TV to work properly. This may help you narrowing down the bad modules instead of buying the wrong module just to find out later that it did not solve the problem. Hope this will help you out.

Sound problem:
Let verify first to narrow down to where the problem can be. First, check the on screen sound set up menu to make sure the speakers are not set to OFF. If the setting is OK, then attach the powered PC speakers to the Audio Line out RCA jacks to see if you can get the sound there, if you do, then the problem can be in the power amp circuits, if you do not get the sound at RCA jacks, then the problem can be in the sound processor circuit. To get the sound repair, it can be from $150 and up, so if you can put up with using the good set of Powered PC speakers which actually give better sound than the tiny speakers inside the TV, I would keep using it that way, you may want to find out if the on screen sound setup will allow you to set the audio line out to be VARIABLE which means the sound output feeding the PC speakers can be varied using the TV remote control, then all you have to do is to set the PC volume to about half way up and set the TV volume to what ever you want.

Inverter board connector: you can also see the Fuse 4A/160V
http://i.fixya.nethttp://i.fixya.net13ca788.jpg
Power supply connector:
http://i.fixya.nethttp://i.fixya.net78e0d9a.jpg

http://i.fixya.nethttp://i.fixya.net2fc510f.jpg
T-CON board: (metal cover shielding is removed to show the bd.)
http://i.fixya.nethttp://i.fixya.net0b5367e.jpg
Inverter board:
http://i.fixya.nethttp://i.fixya.netaf0a695.jpg
Logic board:
http://i.fixya.nethttp://i.fixya.net4bd108e.jpg
T-CON board is dead, no power or blown fuse on the board, screen turns WHITE, must see it in darkened room, otherwise you may mistaken it for failed backlight.
http://i.fixya.nethttp://i.fixya.net3a91b68.jpg
Bad T-CON board after warm up, you get lines, multiple pictures, strange colors blotches, etc.
http://i.fixya.nethttp://i.fixya.netd3cf194.jpg
Bad caps (leaking/bulging tops). Make sure to replace bad cap with good cap such as PANASONIC FM or FC series , they are Low ESR (Equivalent Series Resistance) which is a must for switch mode power supply, and 105c rating. Do not use generic electrolytic caps.
http://en.wikipedia.org/wiki/Capacitor_plague

http://i.fixya.nethttp://i.fixya.netbe827ec.jpg
Bad T-CON board or power supply problem

http://i.fixya.nethttp://i.fixya.net034e1db.jpg

24vdc power supply output testing using two 12vdc car lamps in series.

http://i.fixya.nethttp://i.fixya.net4f2929c.jpg
Bad LCD panel, vertical 1~2 pixel wide lines
http://i.fixya.nethttp://i.fixya.net28e50c1.jpg
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm

Free service manuals: www.elektrotanya.com

on May 18, 2011 | Sony BRAVIA KDL-40S2010 40 in. LCD...

1 Answer

Power cable issue


It should be 32 volts DC ..this purple one only has two pins in it...now the gray one's have 3 pins..and I think it has 32 volts DC and 16 volts DC out...

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1 Answer

Insignia ns lcd 32 wont power on


When you plug in the set, does the standby light come on? Most likely you are dealing with either a failed power supply or main board. I would start with checked the power supply for bulged capacitors.

Dec 15, 2012 | Insignia 32" 720p Flat-Panel LCD HDTV

1 Answer

Tv click it but no picture no sound power supply voltages are ok no out voltages on high voltage board


Try to remove the connector that supply the high voltage and observe if the unit will produce a sound. May be the inverter is faulty. Or try to check if there is a 24 volt dc supply to the inverter or the high voltage board.

Jul 14, 2011 | Sanyo DP32647 32 in. LCD TV

1 Answer

Sony Bravia LCD KLV-32U300A Symptoms: ~ powering up problem, whenever try to turn on click twice and power goes completely off no standby indicator as well. i have to discharge the stored current in the...


I know its a 32 inch TVand its probably about 2 years old, give or take. If you got a warranty on it, I suggest calling whoever you got it from (BestBuy,Amazon, etc) and seeing what they can do for you to get it fixed for free. Otherwise call Sony abotu getting a real tech out to either fix or swap parts on the TV at your house, or where to send it for repair. Depending on what it costs, you are probably better off buying a new 32inch LCD TV for about $400.

It seems you have isolated it down to the power supply though. If you are confident enough, you can get a replacement on ebay for abotu $100.

Just depends on what you value more: time or money.

May 21, 2011 | Sony Bravia KLV-32U300A 32 in. HD-Ready...

2 Answers

Were can i purchase protron ac/dc power supply for protron pltv-32 pltv32 lcd tv


Check this link below:
http://www.lcdpayless.com/productpage.php?productId=5441

Specification of Protron pltv-32 lcd ac adapter:
Output Voltage: 24V and 12V Volts DC
Amperage: 6 A and 3 A Amps

May 15, 2011 | Protron Ac / Dc Power Supply For Protron...

1 Answer

I have an insignia 32 LCD TV, it wont power up but the LED blinks when you hit the power button or the remote.


It is a bad power supply and that is common on that set, if you remove the back of the set and check the power supply board, you will find a couple of electrolytic caps that need change, or just replace the power supply.

Nov 14, 2010 | Insignia IS-LCDTV32 32 in. Television

1 Answer

JVC DLP MOD#HD55G466 what is the voltage from power supply to ballast and into the lamp.I have no voltage to the lamp could it be ballast?


Hi,
Ballast board gets voltage from power supply connector CN90BL and volts readings are as follows:
Pin-1 = 380V DC
Pin-2 = Ground
Pin-3 = 15V DC
and output of ballast board would be 12,000 volts AC that goes to lamp to generate spark in its electrodes to produce high bright light.

If you get volts on input of ballast board but still lamp does not fire up then ballast board is not working.
Ballast board part number is QAL0765-001 and available with tv-part.com for $125
Hope these info will help you.
Thanks.

Nov 16, 2010 | Televison & Video

2 Answers

Insignia 32 HELLP


You can find parts for your TV here. If the power supply is an internal component, it is strongly recommended that it be installed by a TV repair professional.

Sep 30, 2009 | Insignia IS-LCDTV32 32 in. Television

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