TCL LCD TV L32M11HD no standby

[t4796]

Hi,

I have a TCL 32" LCD on the bench. No standby 3.3v

I do not have stable voltage on pin4 Vdd of IC1 VIPER12A (with respect to AGND)

Schematic is attached, pictures of standby section now attached.

[budm]

Re: TCL LCD TV L32M11HD no standby

ESR and the capacitance of C84 tested OK?
D810 tested OK?
ZB6 tested OK?
DCV reading on C84?

[t4796]

Re: TCL LCD TV L32M11HD no standby

Thanks for the reply. I've taken the following measurements:

ESR and the capacitance of C84 tested OK?

CB4 - 21.14uF on meter I do not have ESR meter

D810 tested OK?

measures 1.078k (meter - to cathode) and 0.077M (meter + to cathode)

ZB6 tested OK?

measures 1M+ (rising on meter) (meter - to cathode), 0.676V in diode check mode and Open (meter + to cathode)
I didn't remove ZB6 to test because it was surface mount. I desoldered pin 5 IC1 which hopefully isolated that side.

DCV reading on C84?

19.55VDC