Tip & How-To about Toshiba 61H70 61" Rear Projection Television
No Startup = Check Q404 (2SC5570) and pico fuse F470 (2A)
Dead = Check Q801 (strz4369, 23135015) or replace QA02
Intermittent Reset = Add cotton tape and capacitor (0.47uf) across pin 54 of QA01 and GND (CA61 GND side)
Dead Relay Clicks = Replace zener D878 (9.1V)
HOT Fails Often = Replace C403 (22uf/100V)
Picture Fades Comes Back Blurry = Replace Q510 and Q221
When environment temperature rises above 95 grade F, television goes out of convergence and vertical slowly rises from bottom of screen = Connect capacitor (10pF/50V) between R4013 (Q421 collector) and R4012 (Q421 base). Add insulation tape underneath capacitor as necessary.
Intermittently no blue colour. Distorted lines in picture = Replace Q751 (STK392110)
Rolling picture. No convergence. Red foldover = Replace Q751 (STK392110) and R7726 (1.2R)
No picture. Audio and OSD OK = Check R243 and R244 (22K/0.16W)
Q510 replacement = 2 IC types have been alternately used as Q510.a) TA1316Nb) TA1316AN...The 2 types are not interchangable. When replacement of Q510 is necessary, the original type must be used. Do not use part number listed in the service manual. Use part numbers listed. Q510, type IC: TA1316N - Use P/N: 23000358 Q510, Type IC: TA1316An - Use P/N: 23000584
Dead & Power LED flashes = Check fuse F860 (4A) for O/C, Q801 (STR-Z4369), D862 (NTE552). Also check zener diodes D873 (27V), D875 (9.1V), D877 (27V) and D878 (9.1V).
Hope this helps...Unless you know exactly what is going wrong, sending the chassis to http://www.ptscorp.com would be my advice.
Posted by Neildo on
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