Toshiba 43H70 43 in. Rear Projection Television
Problem for Toshiba 43H70 43 in. Rear Projection Television

43H70 No Pic/Sound Blinking red light.Voltage at




By kenlois on Jul 09, 2009

" "
43H70 No Pic/Sound Blinking red light.Voltage at Q801 Pin 8 is over +50vdc. What is the Zener Voltage of D876 p/n 23316753 MTZJ33a B1? Any help....
Thanks
kenlois@npgcable.com
Comments:

Aug 01, 2009

- Found transformer T840 Toshiba 23217481 Zebra TPW1566AZ has open primary winding.Toshiba "no longer available".

Aug 02, 2009

- Can't find specs,primary is 120v secondary? Alldatasheet.com has no listing.

Aug 10, 2009

- Thanks for xformer info Ken

Aug 10, 2009

- Subtituded transformer, Set works. Thanks KKolarik for help. Ken

Best Solution

posted on Jul 14, 2009
Helpful)

kkolarik

Rank: Master 
Rating: 94%, 10 votes
according to the datasheet for the MTZJ33, it is a 500mW zenerdiode with a zener voltage between 30.2 to 31.9 volts. FYI.. I got that information on a site called Alldatasheet.com... very useful.
Comments:

Aug 03, 2009

- If T840 is similar to the circuit I'm looking at, the transformer is a 120VAC primary (60Hz), ~ 8VAC 2A output. This transformer sets up the 5VDC standby voltage. If this is correct, just look for a off the shelf equivalent. the way to tell is if the output goes through a bridge to a 5v regulator (on my diagram, the regulator is a PQ05RD11. Good luck.
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