Forum > LCD TV forum
Acoustic Solutions LCDW22DVD95F stuck in stand-by mode
Zyphon:
--- Quote from: jimca007 on August 26, 2011,18:11:07 ---Had a couple of these things stuck in standby due to the wee blue caps on the inverter output . As a check you can remove them from the circuit board and see if the set boots up if it does get replacements from either a supplier or ebay and away you go... good luck
--- End quote ---
Thanks for the tip Jim, I will take out those blue caps and test them and buy replacements. It would be nice to diagnose and fix the fault if nothing else but to help others on the forum who have the same problem with this PSU.
Cheers. I'll feedback once I order the parts and replace them. :)
jimca007:
if they are faulty takin them out will generally allow the inverter to come up...it's worth a try anyhow...seem to remember there was another tip posted about this psu involving a 1k resistor being fitted between pin 1 of the inverter chip and earth to disable the tube error circuit check past threads I'm sure theres been a few tips over the last wee while concerning the IPS 1 & 2 PSU/invertor range
Zyphon:
Thanks Jim, I think I have seen that thread with the 1k resistor tip while I was looking into the 17ips02-2 PSU board. I guess I could try that also. I shall take the caps out of circuit tomorrow to see if the board boots.
Thanks again for your help. Much appreciated.
I shall try and hunt out any other tips for the IPS 1 and 2 PSU/inverters.
Zyphon:
I have just realised that the 17ips02-2 board on my LCD TV is version 3 would it have much of an impact if I installed a V2 board?
I notice that that the V2 board has 2 extra caps beside both of the inverters TR300 and TR306. The V3 board only has the central caps by the two inverters.
@jimca007
Hi Jim, I removed both of those caps as suggested but the set does the same thing so no change. Alas back to the drawing board.
jimca007:
It's always difficult to thorise when you can't observe and test the board/components yourself but if it were mine the next thing I'd do is temporarily remove the blue caps that straggle the black seperation line on the psu and see if that makes a difference, progressing to replacing the 2 square grey smoothing caps on the input, again trying to get it power up. finally going to the smoothing block ( the big black capacitor on the primary ) just make sure you know its discharged before going near it, a wee 15 w bulbs with 2 insulated wires running from it, place the bared ends of the 2 wires across the 2 contacts of the cap and see if the bulb briefly lights if it does you've discharged it , if it doesnt it's unlikely to have held a residual charge . Failing that a crude way is to stick an insulated screwdriver across the 2 cap terminals shorting them out. If after all that it still won't power up your lookin at mosfets/transistors/diods etc and it starts gettin a wee bit more complicated just depends how far you want to go..... most of the time it isn't worth it to go further the time outweights the monetary value of the psu.... sad but true
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