Question about Televison & Video
Is it normal to measure 5V in the 5VSB pin on the power supply? Power on is at 3.7V. The rest of the voltages are present namely ; 24V, 12V,5V. -could there be a problem with the control board. If yes how can i confirm. Many thanks Bryan G
Posted by Anonymous on
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
I just repaired 3 1800FP's - all dead, no lights.
Firstly a dead 2AS01 is 95% of the problem, because some fool designer left out the protective zener diode - cheapness.
Mouser Electronics does not have this part, but lists it at 37 cents in lots of 2500, and gettable at $2.66 somewhere else.
You must also replace the two small value electrolytics near this IC, as some had an ESR of 40 where <0.5 is where it should be.
I suppose as the electro's dry out, the spikes can zap the IC. The quacks on ebay flogging 2sa01's alone, probably hope to sell you another one down the track (at a fat markup).
There are 2 'Sam Young 2200uf' electros that really should be replaced, with ESR or 2-30 ! Ideally replace ALL electros, as the others will be off - but those 4 as a minimum and using a jewelers loupe, resolder other joints on the transformer and anything that looks more dull silverish, than the rest. A 1 inch used and worn paint scraper will get the case open easy.
DANGER, CAUTION : Finally when refitting the inverter board, ensure the steel tab is over the TOP middle of the board facing away from the power socket (SO YOU CAN SEE IT) . The board sides in flat. It is possible to scew the board down with a slight bend, with the tab pressing over the pcb tracks - very , very bad!
Now all I need is for some kind soul to improve the fix by stating what the value of the missing zener should be.
PS. Just because the caps are not bulging does not mean they should be OK. Most wrecked 10 year old power supplies have better ESR's, so the electronics must be hot under the cover.
I have seen bulging caps with a GOOD ESR, and non bulging ones with an ESR of 47.
Posted on Aug 28, 2008
SOURCE: 5v present on stb voltage
Plasma and LCD TV sets are prone to having capacitors in the power supply section fail. This is the most likely cause for the probem you describe. When capacitors fail your will commonly see one or more of the following symptoms.
Again, You can get a power supply repair kit with the parts, detailed instructions, and support from sites such as www.TvRepairKits.com . Or just click here to see more details on their kit.
Here are pictures of capacitors...Notice that the ones below look bloated. They have failed and will need to be repalced.
Capacitor being replaced! Fairly easy DIY fix.
Again, You can get a power supply repair kit with the parts, detailed instructions, and support from sites such as www.TvRepairKits.com . Or just click here to see more details on their kit
Posted on Jun 10, 2011
Sure the power supply si working and the processor seems struck up to trigger the power but is not responding to the remote. So it is important that the main processor is checked to fulfill the working. Check for the +5 rail voltage, check for the input /output data, check the remote feed of data and the crystal oscillator.
It is possible that there is a failure around the processor or the memory.
Posted on Sep 03, 2011
Testimonial: "Many Thanks for your helpful answer"
Tips for a great answer:
Jan 20, 2014 | Televison & Video
Feb 03, 2008 | Televison & Video
Dec 22, 2013 | Audio Players & Recorders
Jul 20, 2011 | Samsung LA40A450 40 in. LCD TV
Jul 17, 2011 | Televison & Video
Jul 08, 2011 | Uniden CEZAI998 Phone
Feb 12, 2010 | Samsung HCN436W 43" Rear Projection...
Nov 02, 2009 | Sony Televison & Video
Apr 22, 2009 | Bush 5693D 24" TV
14 people viewed this question
Usually answered in minutes!