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Search: Posts Made By: PlainBill
Forum: Troubleshooting Computer Displays 03-03-2012, 07:10 AM
Replies: 16
Views: 3,169
Posted By PlainBill
Re: Pictures of failed monitors, TV's

Let me clarify my opinion on this.

You are making a large number of pictures available and directly helping many people here. That is a very good thing, and I can now take a half day away from...
Forum: Troubleshooting TVs and Video Sources 03-02-2012, 12:42 PM
Replies: 1
Views: 1,953
Posted By PlainBill
Re: Philips 42pf3331 and 42Pfl5603d/12

Split the second TV into a second thread. It doesn't cost much, :wink: and saves a lot of confusion.

Next a single picture of each TV. We want to see the back so we can direct you if we need...
Forum: Troubleshooting Computer Displays 03-02-2012, 12:31 PM
Replies: 37
Views: 5,218
Posted By PlainBill
Re: Gateway FPD2185W not showing display

If you look at the first picture, there is a large white arrow just below the center of the power supply. Everything to the right of the board (and the corresponding area on the top) is the...
Forum: Troubleshooting Computer Displays 03-02-2012, 12:24 PM
Replies: 16
Views: 3,169
Posted By PlainBill
Re: Pictures of failed monitors, TV's

I wouldn't say 'evil', but I do see a very good chance that at some time in the future anyone following the link would see 'not found' or 'expired' instead of the picture.

The alternative, of...
Forum: General Electronics Technical Discussion 03-02-2012, 06:34 AM
Replies: 8
Views: 34,490
Posted By PlainBill
Re: How do I test integrated circuits with a multimeter?

It's possible to do this if you have a schematic. Even without a schematic it may be possible to spot a gross problem. Part of the challenge is knowing what the circuit does.

With a schematic...
Forum: Troubleshooting TVs and Video Sources 03-02-2012, 03:04 AM
Replies: 8
Views: 3,003
Posted By PlainBill
Re: AMC1117 Substitute Question

Not quite. You can use a fixed output type as an adjustable by adding a pair of resistors in exactly the same way they are used on the adjustable type. However, the output voltage can be varied...
Forum: Troubleshooting TVs and Video Sources 03-01-2012, 07:20 PM
Replies: 33
Views: 6,988
Posted By PlainBill
Re: 42" Maxent Plasma MX-42XM11 Lines on screen

Did you check the zener in both directions? If so, it is bad.

PlainBill
Forum: Troubleshooting TVs and Video Sources 03-01-2012, 07:08 PM
Replies: 34
Views: 6,371
Posted By PlainBill
Re: Samsung LN40A650A1F, no backlight

You can observe waveforms, but be very careful. I wouldn't even touch the scope when the TV power supply is getting AC voltage. The voltage on the scope is potentially as high as 400 volts.
...
Forum: General Computer Discussion 03-01-2012, 09:26 AM
Replies: 36
Views: 5,694
Posted By PlainBill
Re: Windows 8 Consumer Preview

Well, it certainly brought out the frustration in me!!! I'm sure some of this was due to a new UI, but it really seems like a step back when all the icons are spread across three screen widths. ...
Forum: General Computer Discussion 03-01-2012, 06:07 AM
Replies: 36
Views: 5,694
Posted By PlainBill
Windows 8 Consumer Preview

Did anyone else try this? What were your impressions?

First, a word of caution. Only install it on a system that has no data that you can afford to lose. One installed, you cannot remove it. I...
Forum: Troubleshooting TVs and Video Sources 02-29-2012, 09:16 PM
Replies: 59
Views: 14,923
Posted By PlainBill
Re: Fixing Phillips LCD TV 37PF7320A

That is common because Philips Service Manuals are tied to the chassis number. This TV has the BL2.3U AA service manual.

Here's the link to the service manual...
Forum: Troubleshooting Computer Displays 02-29-2012, 08:47 PM
Replies: 20
Views: 4,541
Posted By PlainBill
Re: Sceptre X20G NAGA-II no power

This monitor does have a PFC front end which seems to be working.

The voltages on the LDO regulators are all fine, the buck regulators are also reasonable, but my question is why is there no 1.8...
Forum: Troubleshooting TVs and Video Sources 02-29-2012, 07:06 AM
Replies: 202
Views: 66,600
Posted By PlainBill
Re: Vizio VW37 Power Supply PSON working but no 12v or 24v output

There are several different designs for the PS_ON input. In some cases it is nothing more than a NPN transistor with a resistor from the base to the PS_ON pin. On that design the threshold is less...
Forum: Troubleshooting Computer Displays 02-29-2012, 06:57 AM
Replies: 21
Views: 3,984
Posted By PlainBill
Re: Gateway fpd1520 Fuse Blown

You are right, my mistake, it is C9. Hmm, with no timing capacitor this may not be a Royer oscillator. Still, replace the transistors and see what happens.

PlainBill
Forum: Troubleshooting Computer Displays 02-29-2012, 06:50 AM
Replies: 20
Views: 4,541
Posted By PlainBill
Re: Sceptre X20G NAGA-II no power

Lecture 1. When troubleshooting it is important to take a methodical approach. Recognizing symptoms can help avoid wasting time and money.

Lecture 2. You have given us an incredible amount of...
Forum: Troubleshooting Computer Displays 02-28-2012, 09:15 PM
Replies: 21
Views: 3,984
Posted By PlainBill
Re: Gateway fpd1520 Fuse Blown

Sorry, I missed that. Just as I suspected, it seems to be our old friend the Royer Oscillator. By any chance is there a poly or ceramic capacitor of 18 to 33 nF on the back side of the board? ...
Forum: Troubleshooting TVs and Video Sources 02-28-2012, 03:09 PM
Replies: 36
Views: 6,071
Posted By PlainBill
Re: Philips 37MF321D No power no LED

One thing to watch out for, Philips often uses the 'Label = function when high' convention. That is, the label (Standby) indicates the power supply is in standby mode when the Standby line is high. ...
Forum: Troubleshooting Computer Displays 02-28-2012, 02:59 PM
Replies: 78
Views: 22,039
Posted By PlainBill
Re: Samsung 910t

This part is necessary for proper operation of the monitor - it drives the transformer that provides the voltages that the monitor uses.

PlainBill
Forum: Troubleshooting Computer Displays 02-28-2012, 02:56 PM
Replies: 36
Views: 12,522
Posted By PlainBill
Re: Lg l204wt

LG knows. Selldoor suggested you post pictures so we could figure it out. Since you won't do that, try looking it up yourself in the service manual (l204wt LG).

PlainBill
Forum: Troubleshooting Computer Displays 02-28-2012, 02:51 PM
Replies: 720
Views: 243,137
Posted By PlainBill
Re: Samsung Syncmaster 245BW

In general, you always want 105C parts. This is a very compact power supply, heat is going to be a problem.

PlainBill
Forum: Troubleshooting Computer Displays 02-28-2012, 02:47 PM
Replies: 21
Views: 3,984
Posted By PlainBill
Re: Gateway fpd1520 Fuse Blown

Arbitrarily number the pins 1, 2, and 3. Set the DMM to the 200 ohms scale. Measure the resistance 1-2 1-3 2-3. If any reading is below 200 ohms out of circuit the transistor is bad.

That...
Forum: Troubleshooting Computer Displays 02-28-2012, 02:34 PM
Replies: 720
Views: 243,137
Posted By PlainBill
Re: Samsung Syncmaster 245BW

Probably not. Assuming the dimensions are correct and it takes a snap mount, this should be the correct one (http://search.digikey.com/us/en/products/EET-ED2W820CA/P11695-ND/483292). Note that it's...
Forum: Troubleshooting Computer Displays 02-28-2012, 07:33 AM
Replies: 78
Views: 22,039
Posted By PlainBill
Re: Samsung 910t

Yeah, that blew up. I see several alternative solutions.

Search for the schematic. I haven't done an exhaustive search because odds are they will all lead to the same 'aftermarket' schematic.
...
Forum: Troubleshooting Computer Displays 02-28-2012, 04:13 AM
Replies: 78
Views: 22,039
Posted By PlainBill
Re: Samsung 910t

Please don't post pictures inline; use 'Manage Attachments' - below the test entry area.

That's a power FET, almost certainly an N-channel enhancement mode device. Was ther enough left of the...
Forum: Troubleshooting TVs and Video Sources 02-27-2012, 10:13 PM
Replies: 31
Views: 10,172
Posted By PlainBill
Re: Toshiba 40RV525R service manual?

There are several reasons for the 'No main supply output' fault. One is an excessive load on either the main board or the inverter. By disconnecting those loads and turning the main supply via the...
Showing results 1 to 25 of 500

 
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