Re: Samsung LN46A650 with suspected video processor issues
I went through the same steps replacing the TCON and main IO board as well as re-capping the whole thing...no effect. The issue is with the panel. I sold it to a guy on Kijiji that said he knew how to fix it. I said good luck to him and moved on.
freelander
Senior Member
Last Activity: 03-29-2015, 04:17 PM
Joined: 04-26-2009
Location: Canada
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Samsung HP-R4272C Plasma Vertical Dead Band
A friend asked me to look at his plasma that recently has a dead vertical band. Based on Wizard's comments in other plasma posts vertical bands like this usually mean a dead panel but I wanted to be sure. There are no obvious issues with caps. Attached are two pictures...one of the overall panel in the menu and one which is a close up of the dead band showing another distorted vertical band beside the dead one. I'm not sure if this info is useful but wanted to add it in case it pointed towards a fault that makes the panel salvageable.... -
Re: HP F2105 Shuts off - related to brightness
thanks...I couldn't find any sweat but it does make sense that the lamps are aged. I'm going to leave the brightness cranked for now and order replacements.Leave a comment:
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HP F2105 Shuts off - related to brightness
My HP F2105 can be forced to shut off by adjusting the brightness. The screen will flicker for about 15 seconds and then shuts off with the power light remaining blue. However, if I adjust the brightness above 92% it will remain on and operate flawlessly.
I just finished recapping all of the boards and I have the same effect. Any suggestions for troubleshooting next steps?...Last edited by freelander; 09-17-2011, 12:14 PM. -
Re: Samsung LN46A650 with suspected video processor issues
OK...well that kinda sucks and isn't really what I was hoping to hear. Just so that I understand, is this a component or chip on the panel that is bad and it is too difficult to trace down so that makes that panel bad?!?Leave a comment:
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Re: Samsung LN46A650 with suspected video processor issues
I wanted to post again since I am hoping that there is some advice or experience that can point me in the right direction. This TV has the TCON board, the main IO board and the power board. Based on advice from here, I have replaced the TCON and main IO boards as well as replacing the caps with new Panasonic low ESR ones just to be safe (no signs of issues).
The TV is essentially the same where in many images lines will appear and seems to focus on red images for the most part. I can get images that look perfect...Leave a comment:
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Re: Samsung LN46A650 with suspected video processor issues
ok...so I have replaced the main controller board and the TCON board with the same results. The lines follow changes in the signal. Some areas of the display are perfect and others have these streaky lines in them. They are somewhat random at least as much as location goes so this doesn't appear to be a board or display problem from what I can tell.
I can order new caps for the power board but before I go through that exercise could bad / marginal caps affect the board like this? The picture in post 29 is...Leave a comment:
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Re: Samsung LN46A650 with suspected video processor issues
thanks Wizard. Is there anything that I should check with a multi-meter on the T-Con...it seems to be all solid state....Leave a comment:
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Re: Samsung LN46A650 with suspected video processor issues
There is a second thread about this TV with a lot of law suit talk so I thought I would pick up this thread instead. I picked one of these TVs up super cheap and it shows lines that seem to only happen when there is red on the screen. Blacks come out perfect. The tv is apart and everything looks perfect. It was suggested that this was the TCON board but I don't have experience with big tv's and I don't have a scope. Can someone point me in the right direction?...Leave a comment:
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Re: Gateway FPD2185W - what caps to use?
I just took a look at your post and so I apologize if you have already ordered. The caps listed in Bluto's thread are correct. The qty 1-47uF25V and qty 1-10uF50V are the two little caps adjacent to the QTY-2 large 68uF450V caps. They serve completely different roles. If you are ordering from digikey anyway, I would suggest that you also order qty-2 AOD417 (replacement for AOD405) and qty-2 AOD484 (replacement for AOD408) mosfets which are often toast on this board. You will find these when you do a search in Digikey....Leave a comment:
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Re: Gateway 2100
Welcome to the forum. A good place to start would be to post some pictures of the power supply and point out which caps you have replaced. If you have gotten to the point of seeing which bulbs are lighting, I am assuming that you checked the ends and don't see any signs of blown bulbs like dark ends. The most common failure that I have seen with this monitor after the crappy caps that they put in is blown CCFL bulbs and then the 4 FETs mentioned at the top of this page. You will need to look for their replacements at your favorite electronics supply place. AOD417=AOD405...Leave a comment:
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Re: Soyo 24" stopped, help!
I haven't ordered replacement diodes or zener diodes before and I'm not sure how to figure out which one I need just by looking at it. Any suggestions?Leave a comment:
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Re: Soyo 24" stopped, help!
I scraped off some of the glue to reveal the labelling for what I previous called transformers. BSFP24T1 is lavelled T1 so I am assuming that it is truly a transformer. BSFP24L1B is labelled L1 so I am assuming that it is an inductor. Either way, I don't think these components should have any opens so I think that they need to be replaced. I would love if someone could confirm my line of thinking.
I can't find replacements on digikey...any suggestions?Leave a comment:
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Re: Soyo 24" stopped, help!
There are a number of surface mount diodes and one zener diode (Top right corner but I don't really know the difference) that measure shorted when tested with the DMM diode function in circuit. I have circled them. There is one diode (circled in purple) that is a normal diode on the top side of the board that is reading shorted....Leave a comment:
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Re: Soyo 24" stopped, help!
The thermistor is measuring 3.7 Ohm at room temp. Diode D1 is good measuring .48 V in one direction only.
The picture shows a big brown thing that I can't identify in the picture. Point G is one side and D is the other. Point J is one lead of the resistor to the right of the big capacitor. Point H is the negative lead of the big capacitor.Leave a comment:
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Re: Soyo 24" stopped, help!
Have a look at the following:
[COLOR="red"]A to B = .1 Ohm
C to B = .1 Ohm
C to E = OL (1.03M Ohm)
C to D = .1 Ohm
E to F = .1 Ohm
E to G = .1 Ohm
E to H = .1 Ohm
E to J = .1 Ohm[/COLOR]
For each letter above, what is the corresponding component?
[COLOR="Red"]A= one side of jumpers
B= the other side of three jumpers
C= pin 4 (positive) of bridge rectifier
E= pin 1 (negative) of bridge rectifier
F= leg of the heat sink
...Leave a comment:
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Re: Soyo 24" stopped, help!
I double checked pins 1-2 and they are open loop to each other. Pins 1/4 and 2/5 are shorted in pairs out of circuit.
I noticed a little chunk broken away from the thermistor (?) early in the AC power circuit. I don't know what this does but could this be a problem?...Leave a comment:
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Re: Soyo 24" stopped, help!
Since removing the different transformers, I no longer have a short between the two pins mentioned in circuit.Leave a comment:
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Re: Soyo 24" stopped, help!
I was editing pictures from the previous post. I have attached pictures of my actual board. I de-soldered and re-soldered the bridge rectifier for the test that PlainBill suggested. The bridge rectifier is the 4 vertical solder joints that are together.
Note that the fuse and the two transformers mentioned previously are out of circuit right now....Last edited by freelander; 08-08-2010, 04:43 PM.Leave a comment:
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Re: Soyo 24" stopped, help!
I have resoldered a number of things and put a quick blow fuse in which blows as soon as power is applied. Now...how do I track down the short?
I checked the two transformers (UU16-15mH) out of circuit and there doesn't seem to be any shorts.
Here are my results (tested out of circuit) on BSFP24L1B. Using the numbering that I applied, the following is the continuity that I get:
1-4 connected
2-5 connected
3 open loop to all other pins
6 open loop to all other pins
7 open loop to all...Leave a comment:
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