Tip & How-To about Toshiba 61H70 61" Rear Projection Television

61H70 Common Problems According To Local Repair Shop

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.

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2 Answers

Pico/ Resistors what are these??


Pico means small and these look like little small resistors, but don't have stripes like resistors, just part numbers. They should measure as a dead short and be in the immediate vicinity of the STK's

Jan 03, 2008 | Samsung HCN5527W 55" Rear Projection...

1 Answer

Toshiba TZ50V51


You should test a couple of things. If you have a fairly good dmm (digital multi-meter) or like analog meter set it for continuity. Test F860 a small 5 amp pico fuse for open. If open suspect Q801, Toshiba p/n# 23906253. Replace it and the pico fuse.
If nothing open there next test F470 a 3 amp pico for open. If open replace it and the horizontal output transistor 2sd2553, Toshiba p/n# 23314955 and Z450, your voltage divider, Toshiba p/n# 24082877 or its generic equivilent Tpa5007bh. Also replace D478 off the base of Q470 for good measure. D478 is a 30v zener diode.
If you have any trouble with what I've written here print it out and find a good shop. They'll easily understand what I've outlined here and it will better help them in testing and determining the problem.

Nov 05, 2007 | Toshiba 50HX81 50" Rear Projection...

1 Answer

Tv has died!!!!


Sarahp_21,
Check the 2amp pico fuse at F470 and if open replace it and Q404 2sc5570 the HOT (horizontal output transistor).. If not open check HOT for short EtoB and inspect the solder connections of Q801 in the SMPS.
If any of that sounds greek you need to take it to a shop or find someone handy with a meter and a soldering gun that can do the work for you.
If I can help any further just let me know.
Bill
premtech@willapabay.org

Dec 21, 2007 | Toshiba 40H80 40" Rear Projection...

1 Answer

led display goes dead


I suspect intermittent 31V supply, filament supply or bad connections on fluorescent display.
Check Q801 31V reg , R802, zener on base of Q801 located on DC board. Inspect all boards for bad solder joints, reflow and tighten pcb grounding screws.

Oct 23, 2007 | Sony STR-DE635 Receiver

2 Answers

power light blinks


I would start with C869 a 2.2 Uf at 200 Vdc in the power supply. I have replaced a fair share of those in these sets. Of course the first thing to check would be the pico fuse in the power supply regulation circuits F860 a 4 Amp Pico Fuse and if it is blown, you will have to replace Q801 the Regulator IC Str-Z4214 Part # 23906369. If you're not that good at soldering and measuring capacitance and resistance, this would be a job for a more experienced tech.

Jan 24, 2007 | Toshiba CZ36V51 36" TV

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