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We have Elo model ET1987c-4 sw-1 open frame monitors We have found that we have to much HT voltage going to the line output transformer, the voltage regulator (IRFS634B) goes short also the Line output transistor (C5387) goes short circuit, also resistor R571 goes open circuit. Can anyone help a schematic of this model would be a Godsend as we have about 5 of this monitors and all seem to have same problem.

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  • admin586 Feb 29, 2008

    would be prepared to pay for correct circuit diagram for the ELO ET1987C-4

  • Anonymous Mar 27, 2014

    need pdf for manual

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I have the schematic on this board if you would like to send me a email ill send it to you..

Posted on Dec 10, 2008

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Need diagram of the back of a emachines Desktop that shows where everything plugs in


what model do you have? most older emachines, gateway and dells are very similar...1) round purple ps2 to keyboard, 2) round green ps2 to mouse, 3) teal oblong serial 1 is older output to modem, 4) blue oblong vga output to monitor, 5) reddish long oblong is parallel port to printer........ all these are usually not used on newer models...others include a white oblong for dvi to monitor, or small rectangular for hdmi to monitor, as well as the traditional usb 2.0 and usb 3.0 for a multitude of input and output usages...... small round female ports are for sound.. pink for mic, green for main speakers, black for rear surround, gray for side surround, orange for center surround, and blue for line in....may also have an esata port (not used much) and a ethernet port for internet connection (looks like a slightly bigger telephone jack port).... might have a spdif (sony phillips digital interface) for digital audio.....hope this may help...

Jan 03, 2014 | ASUS Essentio Desktop with Intel Core 2...

Tip

Basic LCD Monitors troubleshooting guides


By Bud Martin
First if you can, try the monitor with other PC first to make sure it is not the PC problem.
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.

The monitor will have at least 2 circuits boards, one board will be the logic board where the video cable from PC is attached to, the second board used in most monitors today is the Power supply/backlight inverter board combinations. Some monitors will have separate power supply module and backlight inverter board.
The monitor should be connected to the running PC otherwise it will go into standby mode.
The operations of each board:

1) The Power supply board:
It takes the 120vac 60Hz and converts it to high voltage DC (around 160~170vdc filtered by the 80~150uf 250~450vdc cap) by the bridge rectifiers to be used by the switching power supply circuits that converts this DC voltage into high frequency (around 50~100 KHz) AC for driving the step down transformer. The outputs (usually 2 outputs) of the transformer will be rectified by the diodes to produce the regulated 5vdc for the logic board, and regulated 12~20vdc (12vdc is usually for screen up to 17inch, 16~24vdc for 18~24 inch screen).

The power supply circuits are always on (unless the monitor uses the power switch that actually disconnects the power from the outlet which is rarely used these days) which means that it is running 24/7 using the monitor or not, any spikes and surge will be fed into the monitor power supply.

Common problems:
Blown fuses, bad caps (leaking/bulging tops or bottom seals, please note that bad cap may look normal but it can have high ESR (Equivalent Series Resistance). The DC filter cap should be low ESR type for using in the switching power supply; general purpose electrolytic types will not last very long in switching power supply circuits. Poor solder joints, over heated components.

Testing:
Plug the monitor in but do not activate the power switch so the backlight inverter circuits will be off. Check the 5vdc and the 12~24vdc to make sure they are OK. They should be tested with the load, you can use 6V 1A (6watts) lamp for the 5vdc, and car lamps such as 1157 (12v 8watts lo/26watts high) turn signal brake lamp using high filament connection for testing the 12~18vdc (or use two 1157 in series for 19~24vdc) for the backlight inverter circuits.
If the power supplies are working, the output voltages should be steady at the rated voltages. The power supply will go into shut down if it detects too much current draw due to false in the power supply or short circuits in the backlight inverter or in the logic board.

2) The backlight inverter circuits:
It takes the 12~24vdc and converts it to high frequency AC to drive the inverter transformers CCFL (Cold Cathode Fluorescent Lamp) assemblies. The transformers will drive the CCFL by applying the start up voltage (around 1500~2000v), when the CCFL start conducting, the voltage will drop down to about 500~800v.
The inverter has detection circuits to detect open circuit if the lamp is not attached or does not fire up after the start up voltage is applied, it will go into shut down. It will also shut down if the lamps draw too much current due to ages (when lamp gets old it will draw more current).
The inverter gets two signals from the logic board, one is the backlight ON/OFF signal, the other one is the Dimming signal for the lamps.
Common problems:
Bad filter caps, resonant caps (in the inverter output circuits), blown transistors/IC, shorted or open transformer winding.
Testing:
You should have spare lamps for testing the inverter circuits.

3) Logic board:
The logic board get the signals from the VGA (ANALOG) or DVI (DIGITAL) and processes them and feed them to the LCD panel T-CON (Timing Controller) board on the back of the LCD panel.
It also sends out two signals (backlight ON/OFF and Dimming) to the inverter circuits when the monitor is on and getting the signals from the PC.
If the logic board does not get the signal from the PC, it will put monitor into standby mode.
The 5vdc feeding it is converted to 3.3v, 1.8vdc by the switching buck converters to run the processor.
The logic board also sends the 5vd or 12vdc power for the T-CON board, if the voltage is not there, you will see white/grey glowing screen only.
Not much repair you can do on the logic board unless you have the full service manual and surface mount repair station.

4) CCFL and Inverter circuits testing:
If you don not have the inverter and lamp tester boxes you may be able to do a simple test by using these steps:
If the screen flashes on for a second, you can disconnect all the lamp connectors and connect it into one of the transformer output connector and see if you will see the flash on the screen, if you do, then try it with another transformer output connector to see if it also get the flash on the screen.
Repeat the procedure with other 3 lamps. If all the lamps do flash on for seconds then more likely the lamps are OK. If lamp only flash on one of the transformer output then you will know that the problem in that transformer inverter circuits.
If none of the lamps flash at all then the problem is in the inverter circuits, power supply, or not getting the on signal from the logic board.

Bad caps
http://i.fixya.nethttp://i.fixya.nete17e9cc.jpg

Power supply/inverter board (L), Logic bd. (R)
http://i.fixya.nethttp://i.fixya.netbc19983.jpg'

Dead T-CON bd, blown fuse. Get glowing screen only.
http://i.fixya.nethttp://i.fixya.net4fbd9e1.jpg

T-CON board's fuse F101
http://i.fixya.nethttp://i.fixya.net8506e44.jpg

Inverter board surface mounted fuses, F1 and F2

http://i.fixya.nethttp://i.fixya.net1bf6596.jpg
Bad lamps (Blackened ends, burnt /poor soldering)

http://i.fixya.nethttp://i.fixya.net5c8952e.jpg

http://i.fixya.nethttp://i.fixya.net4e5e9a1.jpg

Bad LCD panel (solid vertical lines)

http://i.fixya.nethttp://i.fixya.netffe90fe.jpg

Bad LCD panel due to bad T-CON board
http://i.fixya.nethttp://i.fixya.netef48b18.jpg
Failed TV and Monitors:
http://s807.photobucket.com/albums/yy352/budm
http://en.wikipedia.org/wiki/Capacitor_plague
Make your own test lamps: http://www.badcaps.net/forum/showthread.php?t=19987

on Sep 25, 2010 | Computers & Internet

1 Answer

Blurd screen of pc


this problem is due to monitor...
You need to contact Monitor service engineer to resolve this issue..
the problem should be on LOT(Line Output Transformer) which is inside the minitor...
this issue happen due to long usage..

thanks,
Satheesh

Jan 20, 2011 | Computers & Internet

1 Answer

Horizontal line appearing on desktop


The fault looks like white lines horizontally along the screen. These are the retrace lines that become visible due to absence of proper screen/grid voltage. You will need to open the monitor only if you are familiar with power electronics, a bit of experince is important as the stages are delicate and contains high voltage. If not take help, check for faulty capacitor or low value of resistors in the screen/grid sections of the crt. Couple across parallel to the suspected capacitor to confirm and change. Use a meter to see the voltage across faulty resistors. In some cases reducing the screen potentiometer ( onthe Line output transformer)can solve the faulty. Hope you try. Good day

Aug 03, 2010 | Computers & Internet

2 Answers

What processor can use to upgrade my Pentium 4 2GHz in my HP M1270


HP Media Center M1270n desktop PC?

Here are the Product Specifications,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00280666&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=443756

Here is the Motherboard Specifications,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00297771&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=443756

The Asus PTGD1-LA motherboard, is a Proprietary motherboard, made Especially for HP.
HP's name is PufferM-UL8E

You won't find it on the Asus Support website.

Fortunately, HP listed basic information for CPU (Processor) Support.

When you look to the right of the CPU/Processor heading, you can see it states -
A) Socket LGA 775 (Processor socket)

Looks like this,

http://en.wikipedia.org/wiki/LGA_775

Processors that fit this processor socket, have the socket holes.
775 of them.
The LGA 775 processor socket, has the pins that go up into the socket holes of the Processor.
775 of them.

[The Socket 478 processor socket, that was before the Land Grid Array 775 processor socket, has the socket holes (478), and the processors that fit this processor socket, has the pins. {478 of them]

B) Supports processors with up to a 3.8GigaHertz frequency rate.
3.8GHz.

['Speed' is a slang term for Frequency Rate.
Giga = Approximately 1 Billion
Hertz stands for Cycles per Second.

3.8 Billion Cycles per Second.
Can also be stated as 3800 MegaHertz.
Mega = approximately 1 Million ]

C) Can support Intel Pentium 4 processors with HT.
Hyperthreading Technology.

D) Looking to the right of the Front-side bus (FSB) heading, you will see it states -
800MHz.

This means the Asus PTGD1-LA motherboard will support Pentium 4 processors with,
1) HT
2) UP TO a 3.8GHz frequency rate
3) Up to a FSB frequency rate of 800Megahertz.
4) Use an LGA 775 processor socket.

Now let's look at one example, of a chart of Pentium 4's with HT, that fits these specifications,

http://en.wikipedia.org/wiki/List_of_Intel_Pentium_4_microprocessors#Prescott_.2890.C2.A0nm.29_2


See the heading - Prescott (90nm)?
This means the processors in this chart, are based on the Prescott Core, and the 90nm architecture.

(nm stands for NanoMeter. Approximately 1 Billionth of a meter)

Looking at the headings in the chart, you will see Model Number, sSpec Number, Frequency, L2-cache, Front-Side Bus, Multiplier, Voltage, TDP, Socket, Release Date, Part Number/s, and Release Price.

At this point I would only concern myself with the,
Model Number, (If applicable),
sSpec Number,
Frequency,
FSB, (Front Side Bus),
Voltage,
Socket,
and Part Number(s)


1) Model Number:
The older Intel Pentium 4 HT processors did not have a Model Number.
Intel didn't start using a Model Number until later.
Model Number examples start with 517, 520, 520J, and so on.

Look for the sSpec Number, and the Part Number, for the older Pentium 4 HT's. They're printed on the top of the processor's case, and should be listed by the seller.

2) sSpec Number:
Intel brought this out.
Their way of marking a processor.
Another identifier for you to use.

3) Frequency:
The Maximum frequency rate, ('Speed'), that the Processor is supposed to be able to operate at.

4) L2-cache:
The small memory area for the Processor. The Processor accesses this small memory area first, because it operates at the same frequency rate as the Processor.

You can't change it, and 2MB of L2-cache, is the largest size for an Intel Pentium 4 with HT.
Just thought I would include this information.

(Ram Memory is next. Typically, Ram Memory operates at half of the FSB frequency rate. The Harddrive is next)

5) Front-Side Bus (FSB):
The frequency rate that the Processor transfers data (Information) to the Northbridge chip, and back from the Northbridge chip.
More on the Northbridge chip in a moment.

6) Voltage:
Pretty self-explanatory. The Voltage range the Processor will use.
You need the Voltage range of 1.25/1.4 Volts.
(1.25 Volts to 1.4 Volts)

Any Processor (That is Intel Pentium 4 HT, Socket LGA 775), that uses Voltage in this range will work.

7) Socket:
The type of processor socket that the Processor will fit in.
Has to be LGA 775.

8) Part Number(s)
Self-explanatory again.
The Part Number, that is stamped on top of the Processor's top case.

Part Number(s) is listed, because there may be more than one Processor in the Model Series, that fits the same specifications.

If there is no Model Number, refer to the sSpec Number, or Part Number.

The largest frequency rate (Speed) of Processor you can use, is a Pentium 4 HT that operates at 3.8GHz. (And fits in an LGA 775 processor socket)

Barring that a Pentium 4 at 3.8GHz cannot be found, you will know what Processors you Can use.

Scroll across the headings with your eyes, and start under the Frequency heading.

Find the frequency rate ('Speed') you wish to try.

Go across to the Front Side Bus heading. You should look for a processor listed that has an 800MHz listing.

Look at the Voltage.
All of the Intel Pentium 4 HT processors that fit in an LGA socket, use an 800MHz FSB, and are in THIS particular chart, fall within the same Voltage range.

Keep the Voltage range in your mind, as you look at the other charts below this one.

Socket.
You know you need a processor that fits in an LGA 775 socket.

Look at the chart below this Prescott Core (90nm) example.
Prescott 2M Core (90nm)

Use the above criteria above in this chart.

I wouldn't recommend any Pentium 4 HT's, in the Cedar Mill (65nm) chart.
It isn't that the architecture is smaller (65nm), but that the BIOS program,and version on your motherboard, may not be able to handle these processors listed.

I also do not see a BIOS update for one, and for two, if you make a mistake when performing a BIOS update, your motherboard becomes an expensive Frisbee, or doorstop.

You also do not want any of the processors listed under the Pentium 4 Extreme Edition heading.
$$$$$$$$$$$$$$$

(Mobile Processors are for laptops Laptops are M-O-B-I-L-E)


Northbridge chip.

1) The Northbridge chip, and the Southbridge chip make up the motherboard chipset.

(Does not apply to the new motherboards that support the Intel i3, i5, and i7 Core processors)

2) Chip and Chipset are slang terms for I.C.
Integrated Circuit.

http://en.wikipedia.org/wiki/Integrated_circuit

The Northbridge chip handles the faster processes of the computer.
Processor, Ram Memory, and High speed graphics.

(AGP or PCI Express. Not a graphics card in a PCI slot, nor Integrated Graphics on the motherboard. These are slower processes of the computer)

http://en.wikipedia.org/wiki/File:Motherboard_diagram.svg

(CPU = Processor
Memory Slots = Ram Memory slots)

Looking at the diagram, you can see the slower processes handled by the Southbridge chip.

Looking back at the Motherboard Specifications, look across from the Chipset heading.

Northbridge: i915P graphics and memory controller hub
(MCH)
Southbridge: ICH6 Intel I/O Controller Hub 6

Uses an Intel 915P Northbridge chip, and an Intel ICH6 Southbridge chip.


Jun 27, 2010 | HP Media Center m1270n (PP132AA#ABA) PC...

2 Answers

Hello i have a Sony Vaio PCW-W2 that i brought to canada from uk. how do i switch voltage to 110?


u can find voltage converter connectors......try using that....u can ask for travel adapters....hope u find them

Mar 08, 2010 | Sony Computers & Internet

1 Answer

Looking for technical manuals


I talked to 3 different departments at ITI, they all say you can't get them anymore (sales, tech support, and repair) No one even has a number for a refurb equipment company.

LINE CARRIER POWER TRANSFORMER
: : ITI part #60-145-235 Canada part #60-366
: : The power transformer supplies a DC voltage of approximately 13 to 14 VDC (unloaded) to the CPU through terminals 1 & 2. Additionally,it contains the line carrier circuitry for the Wireless Interior Siren through terminal 3. The AC power indicator voltage for the CPU is carried through terminal 4.
: : The Transformer is fused with a 400 mA fuse on the primary side of the transformer. Replace only with a 400 mA 250V Time Lag Fuse (ITI Part #33-023).
This is all I could locate, hope something here helps.
please leave rating. thank you

May 06, 2009 | Computers & Internet

1 Answer

When I switch on monitors the power comes after long time. Sometimes it takes 30 minutes


Get your Monitor Checked. Most probably the High Voltage transformer causes this problem. The output high voltage which activates the tube, is not getting sufficient voltage. Change the HT Transformer by a technitian.....................sodeep

Apr 30, 2009 | Computers & Internet

1 Answer

Sis651 no sounds idont know why? ------------------ System Information ------------------ Time of this report: 10/19/2008, 18:55:51 Machine name: DEWIDEWI-557D8E Operating System: Windows XP Professional...


Hello,

Is the sound card built in to *********** board? if no, you have to know your Audio model number and brand..and then download the drivers from the manufacturer's websites..some drivers are here like VGA drivers: http://www.opendrivers.com/driver/236077/sis-sis650-sis651-series-driver-univga3-3.74-windows-98se-me-2000-xp-xp-x64-free-download.html

Hope you will report the model of your audio card.

melnavz

Oct 20, 2008 | Computers & Internet

1 Answer

Broken Elo Monitor Screen


Touch screens are even more expensive that straight LCD panels. This repair may cost more than the original monitor. Why do you need another panel? Is the panel cracked or is the touch screen portion not working correctly?
Dan

Mar 28, 2008 | Computers & Internet

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