leaver
Member
Last Activity: 02-27-2021, 11:14 AM
Joined: 05-21-2013
Location: St. Louis, MO
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LG 47LM4600-UC 47 inch LCD TV With Sam Young Caps in Power Supply
This TV would not come out of standby. I replaced shorted diode D607 on the power supply board and the set worked fine for a few days then quit again with the D607 shorted again. All the caps on were Sam Young and they looked fine to the eye. But I decided to replace them all since that brand is on the "Bad Caps" list. That did the trick and the set has been working fine for several weeks. -
Re: Gateway FPD1760 LCD Monitor
I agree and I should have explained more clearly what I did when I swapped the panel. How do I power up the T-Con board to check for a test pattern? I assume I would have to use a separate power suppply. -
Re: Gateway FPD1760 LCD Monitor
When I swapped the LCD panels, I removed the panel that is coming up with the white screen and installed it in place of the LCD panel on my other working Gateway monitor. As I mentioned before, the screen still came on white so I assumed that the problem was with the LCD panel or T-Con board. Was this not a correct assumption? I did not try to install the good LCD panel in place of the one I am getting the white screen on since I thought I had proven that the one panel was bad. Should I try anything else?Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
My last post said the regulator part number is RT916A. It is a RT9164A. Sorry...Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
I swapped the LCD panels back to their original configuration and measured the voltage on the large IC4 voltage regulator near the TI chip on the T-Con board. It reads 3.32 volts on the output pin (center pin). The part number of that regulator is RT916A. One thing I may not have mentioned before is that the screen comes on white and shuts down in about 3 seconds. I guess that is because the monitor is not plugged in to the PC.Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
jose6326: If you have a Gateway FPD1760 monitor, you can disassemble it as follows:
1) Remove the two corner screws on the back at the bottom of the case.
2) Separate the silver and black sided "picture frame" from the black plastic rear case with a stiff thin tool (like a metal putty knife). Start at the bottom in case you knick the frame a little while you learn how to do it. There are plastic retainer tabs all around the frame that must be separated in order to remove the frame from the back plastic rear case.Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
I swapped the LCD panel with by good panel and the white screen came up just as before. So, I will check the voltages as you suggested on the T-Con board.Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
lexwalker: I assume you are referring to the large IC (IC1) since it has a TI logo on it. Which pin do you think I should be measuring the voltage on? It looks like it has about 100 pins. I am out of town until Friday so I will resume checking when I return. I do have another gateway monitor (same model) so I guess I can try swapping LCD panels to see if that is the problem.Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
I am including a better focused picture of the center section of my T-CON board so you can see the area around the surface mounted inductor you referred to. I don't see the test point pads with voltage labels but maybe you can since you know what to look for. Also, do you know if there are any service manuals available for this monitor on the Internet? Or, if it was made by Samsung for Gateway, is there an equivalent Samsung model that may have a schematic on the Internet? Thanks....Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
Jetadm123: The 1084-18PE regulator is on the T-Con board and the output is 1.79 volts.Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
The large sticker on the back of the LCD panel has the following on it:
BOEhydis and a number to the right which is HT17E13-100 and it says it is made in Korea.Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
I am attaching pictures of the 3 boards in my Gateway FPD1760 LCD monitor....Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
I checked the voltage on both sides of F1 and F2 on the T-con board as follows:
1) When power was turned on, the blue light comes on.
2) After a 5 second delay, the voltage on both sides of F1 and F2 reads 4.98 volts.
3) The IC1 regulator next to F2 has 3.3 volts on center pin.
3) The LCD display is all white (fairly bright).
4) After about 5 seconds, the display turns off and the power light goes to amber.
5) Voltages at F1 and F2 go to zero.
The CRT on my 5o year Eico 460 O'scope is so dim...Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
Budm: Are the F1 and F2 that I mentioned earlier the fuses on the T-con board?Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
lexwalker: Do you know which pins on the T-con connector (at the LVDS connector) have the supply voltages?Leave a comment:
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Re: Gateway FPD1760 LCD Monitor
Thanks for responding "retiredcaps." I found the long board and it looks like there are two possible fuses labeled F1 and F2. They are near one another and are both labeled with the number 110 with the letter P over each number. They both appear to be good (0 ohms) with my multimeter. I will try to get a picture tomorrow but I am not sure my camera batteries are charged or I can get the resolution you are asking for.Leave a comment:
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Gateway FPD1760 LCD Monitor
At first, the monitor did not come on at all so I Replaced 10 caps on the power supply board (all but 100mf 450v). Now the blue power light comes on but the LCD screen is all white. I read on some of the various badcap threads that this may be due to a blown fuse on the t-cont board. Where is this board located? The shielded metal box on the back of the LCD panel just has two boards - the power supply and a logic board that the vga cable from the PC plugs into. Do I have to take the back off of the LCD panel to get to the t-con board?
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