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Equipment Repairs => LCD TV forum => Topic started by: Turnip on October 26, 2009,11:33:02

Title: Wharfedale L1911W-A
Post by: Turnip on October 26, 2009,11:33:02

Hi Folks,

  Have one of these - totally dead. Phihong PSA066-120H PS puts out a stable 12V (it's only output) Main panel and invertor (both sides of the fuse) are at 12V. Thought I was on to something discovering the main panel Buck output was 3.5V, then found that 1501-50's do just that. Always feel there should be a 5V somewhere.

  Think I just need a main board or a smashed screen - any thoughts ? - Chris.

Title: Re: Wharfedale L1911W-A
Post by: daz on October 27, 2009,05:05:40

hello chris
your right you should have 5v, check u7 its a very small 5v reg,its located an inch below the glass fuse on the main pcb
let me know how you get on
daz

Title: Re: Wharfedale L1911W-A
Post by: Turnip on October 28, 2009,06:10:56

Hi Daz and thanks,

   5v present on U7, large chips warmish but set like a Dodo. No LED or voltage changes pressing on/off, on set or RCU.

   Hmm - Chris.

Title: Re: Wharfedale L1911W-A
Post by: daz on October 28, 2009,09:10:34

hi chris
some voltages for you to check
u8 eprom next to 5vreg should have 5v on pin 8
the connector on the stndby led pcb should be pin 1 - 3.8v,pin2 - 5v, pin 3+4 - ov,pin5 - 1.73v
maybe you can trace the missing voltage?
just noticed,all major ics are stone cold in stand by ,i think you might have a cpu fault if there getting warm.
let me know how you get on
daz

Title: Re: Wharfedale L1911W-A
Post by: Turnip on October 29, 2009,07:11:56

Hi Daz,

   Checked voltages as suggested, on U8 5v present pin 8, but on the LED PCB pin 1 was 2v, pin 2 was 5v, 3 and 4 0v and pin 5 also 0v.

   Any further thoughts ? - Chris.

  PS just fettled a Phihong PSM210, so feeling chipper.

Title: Re: Wharfedale L1911W-A
Post by: daz on October 30, 2009,11:59:09

hi chris
sorry the customer has picked the set up so carnt check anything else
but if you havent even got a standby light it stinks of a cpu fault
let me know if you sort it
daz

Title: Re: Wharfedale L1911W-A
Post by: Turnip on October 31, 2009,12:16:38

Thanks Daz,

   Another for the pile, but that's current Wharfedale, didn't they formerly make decent loudspeakers ?

   Might retire, again  - Chris.