xenius LCDX32WHD88 (B)

[snipersquad100]

Hi I got this xenius LCDX32WHD88 (B), when you turn it on the blue led goes off for about 3 secs then comes back on and tv does not power up. The power board is vestal 17pw26-3 v.1. Theres no voltages printed on the silk screen so cant test voltages. Caps look ok, I will test them in a bit, just woundering if anyone got a schematic for it so to test voltages first.
Thank you.

[tom66]

Re: xenius LCDX32WHD88 (B)

A quick check of PSU function would be inverter 24V - the red wires running off to inverter.

SCH also has voltages:-
http://www.tgohome.com/ServiceManual...&Search=Submit

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

thank you tom

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

Only getting 22 volts on the 24volt net.
Will check the caps on that net now.

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

Hhmmm caps are ok

[tom66]

Re: xenius LCDX32WHD88 (B)

Check PFC voltage across two points marked should be around 390V when turned on.

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

I only see one point, but from there to ground is 220v then when I power up the set it rises to 265v dc.

[tom66]

Re: xenius LCDX32WHD88 (B)

Black point on resistor lead, just above that red point on diode. Testing relative to ground isn't valid unfortunately.

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

Oh yea I see it now.
Yes I got 390v there.

[tom66]

Re: xenius LCDX32WHD88 (B)

OK in which case PFC is working so I'd look at replacing that little grey box capacitor next to the transformer. No experience myself, but I've heard of others with this problem and that cap caused it.

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

will do

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

hmmm I just pulled out that cap, The schematic says it should be 12n at 630v
The cap I pulled out was 223j630 which I think should be 22n and is measuring 21.9n.

[tom66]

Re: xenius LCDX32WHD88 (B)

Did you manage to check 12V and 5V outputs too? Perhaps 24V is low because backlights not on. Worth a thought, could be bad main board.

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

ahh I haven't got 12v either. sorry about that.

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

it stuck on stand by now.

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

how do I trick the power supply into turning on without the main board connected?

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

ha, I got the same power supply in my parts bin, that's a bit of luck.
it works now.
Is there any way I can use this psu to find the fault on the other one?

[tom66]

Re: xenius LCDX32WHD88 (B)

Check what 24V measures as TV boots up... Do you only see 22V?

[snipersquad100]

Re: xenius LCDX32WHD88 (B)

I've returned it now.
Funny thing I got a Murphy 42883fhd same problem and very similar power supply vestal 17pw26-4

[tom66]

Re: xenius LCDX32WHD88 (B)

Do note however you can't use 17PW26-3 in 17PW26-4 TV, as the -4 is rated for 40"-42" and the -3 is for 32"-37". You can do the reverse though.