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Dell 17 inch LCD model #177FP * screen is good and caps replaced * pwr supply is good but start circuit voltage will not go 3 volts appears to stay in shut down mode. * this model has power, video and inverter all on one board.

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Posted on May 07, 2010

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Vizio VT470M no picture, no sound, no backlight. Power supply board looks good all voltages appear correct (24V, 5V, and 3.7V) and no "bulged" capacitors . When I unplug unit for two hours, the...


Im having similar problem and with my limited knowledge of lcd tvs and the voltages ALL being good except the pwr on or sw on voltage from the main board to the power supply which tells it to switch everything on Im guessing that something is going wrong on the main board. In the condition where it freezes it (the power on V) which switches everything on i get varied voltages such as 2.5 or 3 or (the normal 5v) and then when nothing powers up (blank screen) i read 0v on pwr on voltage but all my other voltages are corect (24v to inverter, 12 v to main board, 5v, etc.) Im guessing from researching this is that there is in improper voltage somewhere in the main board circuit. I have been unable to find it so i may order another board and post back.

Jun 19, 2012 | Vizio VT470M 47 in. TV

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LED blinks in milli seconds and the images appear too late.


If your lcd comes with ac adapter open this and check for blown or bulge capacitors, replace this with same value.

If your monitor comes with plug cable, open your monitor (too risky to do it by yourself) check the power supply section, check and replace blown and bulge caps.

Jul 09, 2010 | Samsung SyncMaster 740N 17" LCD Monitor

1 Answer

Dell 17 inch LCD monitor will not power up. All the capacitors have been replaced, Power supply voltages are good.


If your getting no lights at all and no activity then that means the power board is bad. If the power light is turning on but no video then that means the screen is bad and you would be better buying a new lcd then replacing the old one cause it can get expensive.

May 06, 2010 | Dell E173FP 17" LCD Monitor

1 Answer

LCD display failure


First place to check will be the power supply section, look for bad caps with bulging top first, post back what you see so we can guide you more, see example of failed monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums

Inverter/pwr: http://www.lcdrepair.us/e193fpc-inverter-power.html

Feb 17, 2010 | Relisys RLT1720 17" LCD Monitor

1 Answer

Dell E173FPs LCD screen (4 years old) is blank, power button is blinking green. I have read numerous articles about the same problem on similar models (E173FPc?) caused by poor solder connections at...


Replacing transistors would be the last thing in that troubleshooting. First, check all electrolytic capacitors if there are any of them "bubbled", replace those. Next, if there is the fuse used for supplying DC voltage to the inverter area, take it off and check if LED will still blink as before. If there's no such fuse, you can cut the trace, supplying DC voltage to the inverter, another words, you need to unload inverter from power supply and check LED behavior then, if it will stay steady, then next steps will be to troubleshoot the inverter, otherwise, using ohmmeter ring all capacitors and diodes in the power supply part, especially connected to PWM chip at primary side of pulse transformer. By the way, what kind of chip is there?

Apr 05, 2009 | Dell E173FP 17" LCD Flat Panel Monitor

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Dell Blinking Power Light


Hi There,
I have worked on several of the Dell 17" and that is almost always the Capacitor problem.

The caps have died inside, and they can be replaced. If you have basic electronics skills, you can go in, order replacement caps, and unsolder and resolder. If you can't do it yourself, you can take it into a shop.

If you can get inside the frame of the monitor, and disassemble, you can find the caps by seeing a bulge on top, or even a rusty looking material on the top. Be VERY careful around the high voltage section if you do go inside.

Here is a link to the Cap plague that explains what happens in detail. But I repair these all the time with that symptom.

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

Apr 04, 2009 | Dell E153FPf 15" TFT LCD Flat Panel...

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No display, clipping sound appear


The clipping sound is the internal safety switch that keep shutting down the monitor.
It means there is an internal problem on the main board (overvoltage, bad component , short).
Try unplugging power cord and leaving it unplugged two or three hours, this will reset ICs by draining power completely from circuits, it is called hard reset, it rarely works.
CRT monitors waste up to 15 times more energy than TFT screen, if your CRT starts giving troubles, then it is a good time for upgrading it to a new TFT.
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Model CF1926A TV with insufficient vertical height. I replaced c308, c305, c301, c315. voltage was missing from ic501, pin 29; restored with replacement of c301. no help to vertical. voltage was missing...


I think you missed one cap. Look for another 1ufd cap close to the jungle chip. It will have the circuit designation in the 300's like the others in the vertical circuit. It is just not located close by. I think that one will fix it.I don't have the service data with me so I can't give you the exact designation.
Dan

Jun 04, 2008 | Toshiba Televison & Video

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