Acoustic Solutions LCDW22DVD95F stuck in stand-by mode

[Zyphon]

Hi All,

I have an Acoustic Solutions LCDW22DVD95F LCD TV/DVD combo. I bought it from Argos (UK Store) about 18 months ago.

I turned the set on one day and it was stuck in stand-by mode with just the blue stand-by LED lit. If I press the Power button on the remote control or at the back of the TV, the blue LED goes out for a second or two and then back on and the set refuses to come on.

I have read several threads on this forum surrounding LCD TVs and capacitors seem to be the culprits on the power circuit board. I wondered if this might be the case here.

I have attached 2 photographs of the power circuit board, sorry the quality isn't great, the photos were taken in haste and suffer from slight camera shake. I can take again if required.

I noticed on Cap 806 the big cap on the right that the top is slightly bulged and wondered if this had failed.

I would be grateful for any help offered as I really don't want to have to throw the TV out as it is in good condition still.

Thanks.

[Turnip]

Hi Zyphon,

Don't recognise P/S but caps look OK. Pic quality dire, give us some definition - also, rest of the set (from the back)  - Chris.

[Zyphon]

Hi Turnip,

Thanks for the response. Yes sorry about the quality of the photos. I will take some more photos tomorrow and post links to them with higher definition. I also lowered the resolution in order to save space but I will upload at full res next time.

I will take a full photograph of all the board. Do you want the sections individually photo'd also?

Thanks again.

[Zyphon]

Hi Chris,

I have uploaded some more photographs of the circuit board for my LCD TV. I hope these are of better quality than the previous.

The whole chassis:
 
Above; the left photograph shows the power lead plugged into the socket on the circuit board.

Section by section:


I hope these photos provide more insight to the workings of my particular set.

Thanks in advance for any advice offered. :)

[sparky]

hi
have you checked any caps or diodes? on psu
dave

[Zyphon]

hi
have you checked any caps or diodes? on psu
dave

No I haven't had the chance to test them yet. I was kind of hoping that I would get lucky and someone would recognise this board and tell me that there a common fault with it. Alas I think these Acoustic Solutions are re-badged so I may have to delve deeper.

The multimeter I have does have a capacitor tester but I would need to take them out of circuit in order to test them. I will do that this weekend and go through a process of illumination I guess. Lots of de-soldering heading my way, lol.

[dougc]

Hi, I have just salvaged a 17ips02-2 from a sanyo 22". Yours for 20 quid. Cheers, Doug

[sparky]

thats good value
dave

[Zyphon]

Hi, I have just salvaged a 17ips02-2 from a sanyo 22". Yours for 20 quid. Cheers, Doug

Hi Doug, thanks for your kind offer and £20 is very reasonable. Has the 17ips02-2 board been tested as working? I ask this because it has come from a salvaged TV and I am just a bit concerned that if I buy the board and it too has a fault then I am in the same position and £20 out of pocket. :D

Failing that if it is a working board, do I just click on the buy me a beer icon and pledge £20?

Cheers. :)

[jimca007]

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

[Zyphon]

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

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