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Search: Posts Made By: tmcw
Forum: Troubleshooting TVs and Video Sources 02-16-2017, 03:55 AM
Replies: 1
Views: 255
Posted By tmcw
usp440m-42lp - Issue starting from warm

Someone from work asked me to have a look at their 42" Tevion branded Plasma TV.

The set starts ok from cold, but if left on for 3 or 4 hours, and then switched off, and then tried to start while...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 11-14-2016, 04:52 AM
Replies: 1
Views: 359
Posted By tmcw
Re: ASUS X102A Power supply problem

Just wondering if a Moderator could move this to "Power Supply Design and Troubleshooting", might get some bites there.

Thanks.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 11-09-2016, 05:26 AM
Replies: 1
Views: 359
Posted By tmcw
ASUS X102A Power supply problem

Have a question about these power supplies someone may be able to help with...

The PSU looks like the one in the picture attached, and the 3-pin plug can be slid off, and plugs from other regions...
Forum: Troubleshooting Computer Displays 06-19-2016, 12:55 AM
Replies: 1
Views: 732
Posted By tmcw
Re: HP V185ws - Dead

Was having trouble uploading images last night, front and back of the power board attached.

To add, the fuse (F801) is ok, and I'm getting AC voltage on the live side of the transformer, just...
Forum: Troubleshooting Computer Displays 06-18-2016, 04:54 PM
Replies: 1
Views: 732
Posted By tmcw
HP V185ws - Dead

Have this HP monitor, no life from it.

Had a look at the power board, and there were a number (5) of crappy looking capacitors near the main board connector that I replaced with Panasonics, except...
Forum: Troubleshooting TVs and Video Sources 01-27-2016, 11:24 AM
Replies: 47
Views: 10,129
Posted By tmcw
Re: Digihome 32" LED TV

Just to add to the great info above, another Vestel 17IPS19-3 here, in a Finlux 26" FIN26LEDHDR, with the 3 SB5B0's at the top, and 3 UF5402's towards the bottom.

Found one of the SB5B0's (nearest...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 09-07-2015, 12:26 PM
Replies: 2
Views: 456
Posted By tmcw
Samsung NP300V5A - LCD panel issue

I'm looking at one of these for a colleague at work, attached a photo of what the panel displays. The bottom quarter or so shows a pink hue.

I'm wondering if this is strictly a panel issue, not...
Forum: Troubleshooting Computer Displays 05-11-2015, 06:48 AM
Replies: 11
Views: 1,605
Posted By tmcw
Re: Dell E177FPc - no brightness adjustment

To confuse me further, I found this document that seems to imply that "brightness" is contrast, and "contrast" is brightness. However, the explanation there is for CRTs, so it seems that I'm seeing...
Forum: Troubleshooting Computer Displays 05-04-2015, 03:59 PM
Replies: 11
Views: 1,605
Posted By tmcw
Re: Dell E177FPc - no brightness adjustment

Do you mean with no power applied whatsoever, or with the monitor plugged in, but switched off via the panel button at the front of the monitor?

I thought maybe I was going a bit mad, so I pulled...
Forum: Troubleshooting Computer Displays 05-04-2015, 02:46 PM
Replies: 11
Views: 1,605
Posted By tmcw
Re: Dell E177FPc - no brightness adjustment

If there is nothing connected to the VGA, and the monitor is powered up, it goes straight to a "self test feature check" box with coloured strips that move about the screen like a screen-saver.

Is...
Forum: Troubleshooting Computer Displays 05-04-2015, 02:33 PM
Replies: 11
Views: 1,605
Posted By tmcw
Re: Dell E177FPc - no brightness adjustment

I didn't check both monitors for the voltage on the DIM line, just one of them, but through the brightness/contrast menu, they seem to behave similarly, and I was testing them separately (not on dual...
Forum: Troubleshooting Computer Displays 05-04-2015, 11:36 AM
Replies: 11
Views: 1,605
Posted By tmcw
Re: Dell E177FPc - no brightness adjustment

Thanks for the reply.

With a bit of contortion, I managed to test the DIM line, and as far as I can tell, it's ok.

Pin 2 on the connector from the main-board to the power-board was showing the...
Forum: Troubleshooting Computer Displays 05-03-2015, 03:23 PM
Replies: 11
Views: 1,605
Posted By tmcw
Dell E177FPc - no brightness adjustment

I have 2 of these monitors with exactly the same problem in that the brightness doesn't change when attempting to change the brightness.

Contrast does work, and everything else seems to be ok. Not...
Forum: Troubleshooting TVs and Video Sources 04-19-2015, 02:14 PM
Replies: 9
Views: 1,345
Posted By tmcw
Re: Sanyo - CE32LC81-B (17PW20v2 PSU)

Cheers for that. I'll have a couple of replacements later in the week, and will report back.

Interesting about failing and heat, they're sandwiched between a heatsink and massive transformer, and...
Forum: Troubleshooting TVs and Video Sources 04-19-2015, 01:47 PM
Replies: 9
Views: 1,345
Posted By tmcw
Re: Sanyo - CE32LC81-B (17PW20v2 PSU)

I pulled off the two 15n's, and they are both reading about 11nF.

Is that enough to cause the issues I'm seeing?
Forum: Troubleshooting TVs and Video Sources 04-19-2015, 01:30 PM
Replies: 9
Views: 1,345
Posted By tmcw
Re: Sanyo - CE32LC81-B (17PW20v2 PSU)

Thanks for the replies.

Tried uploading again, but same server error (500), reduced file size to 75% (1.15MB to 600kb), and tried one at a time, but it still wouldn't upload.

Not sure which is...
Forum: Troubleshooting TVs and Video Sources 04-19-2015, 07:41 AM
Replies: 9
Views: 1,345
Posted By tmcw
Sanyo - CE32LC81-B (17PW20v2 PSU)

Have this LCD TV with an intermittent, blue light, not-starting issue.

There were a couple of episodes where the non starting was attributed to a stuck power/standby button on the side of the TV,...
Forum: General Electronics Technical Discussion 12-22-2014, 08:04 AM
Replies: 15
Views: 1,787
Posted By tmcw
Re: Car battery charger - faulty

Doing a bit of additional searching, I found this page:

http://www.vetco.net/catalog/product_info.php?manufacturers_id=14&products_id=4408

It's a page for a bridge rectifier, but it lists...
Forum: General Electronics Technical Discussion 12-22-2014, 05:55 AM
Replies: 15
Views: 1,787
Posted By tmcw
Re: Car battery charger - faulty

I found a S10VB60 in an exotic power supply.

It's rated at 600V and 10A (original was 600V and 8A). As far as I can tell, it's rated the same or slightly better for most of the parameters that I...
Forum: General Electronics Technical Discussion 12-19-2014, 02:51 AM
Replies: 15
Views: 1,787
Posted By tmcw
Re: Car battery charger - faulty

I was having a quick look for a replacement, and it seems the BR86 might be a less used number now.

Would the 806 I see mentioned more commonly, be an equivalent part?
...
Forum: General Electronics Technical Discussion 12-19-2014, 02:18 AM
Replies: 15
Views: 1,787
Posted By tmcw
Re: Car battery charger - faulty

I did the AC test on the 4 outlet taps, and I'm getting 5.90v-6.50v on two, and about 11.80v-12.50v on the other 2, so it looks like the transformer is ok.

I was reading a discussion elsewhere,...
Forum: General Electronics Technical Discussion 12-18-2014, 07:00 PM
Replies: 15
Views: 1,787
Posted By tmcw
Re: Car battery charger - faulty

The switches test ok after I disconnect them from the transformer.

There is the possibility the battery leads were touching when power was applied, not today when I first noticed the smoke, but...
Forum: General Electronics Technical Discussion 12-18-2014, 02:34 PM
Replies: 15
Views: 1,787
Posted By tmcw
Re: Car battery charger - faulty

Thanks for the link. It looks like I should expect continuity between the pick-off points after all. I do need to read up more about them. I was thinking that there were discrete windings for each of...
Forum: General Electronics Technical Discussion 12-18-2014, 01:26 PM
Replies: 15
Views: 1,787
Posted By tmcw
Car battery charger - faulty

Had a bit of a mishap with a car battery charger today, some magic smoke when I plugged it in.

So I opened it up, and it's a fairly straightforward unit, a transformer, 2 switches (12v/6v, Hi/Lo...
Forum: General Electronics Technical Discussion 12-12-2014, 06:51 AM
Replies: 6
Views: 1,366
Posted By tmcw
Re: USB keyboard pinout - Vss

Thanks for the input.

I had another quick look at the keyboard that has the squashed USB plug...

The Vss connection connects to a big metal plate that sits in the lower portion of the keyboard,...
Showing results 1 to 25 of 193

 
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