Question about Toshiba 57HX81 57" Rear Projection Television

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No power, LED blinking, Low voltage regulator IC?

Originally my power led would simply flash. After taking a look, I found fuse F850 open. Replacing this fuse worked for a while, but they kept blowing (usually after long periods of operation). Rather than trying to troubleshoot it further I replaced it with a bigger fuse thinking the component that caused the fuse to blow would eventually smoke (I know, probably not a good strategy). Something failed alright, although not visibly. At this point both F850 and F852 had opened. After replacing the two fuses, the relay clicks but the set doesn't power up. The power LED functions normally (the protection circuit NOT active) and I get nothing on the low voltage side or on the input side of the low voltage transformer. I'm thinking now I have two problems. The orignal problem that caused F850 to blow (perhaps convergence IC related) and now a new problem. Does anyone have any experience with failed low voltage regulator ICs going bad? Specifically I'm looking at Q801 (STR-Z4369). TIA

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  • 143 Answers

Check for bad solder connections then check all fuses the ones that look like resistors too get back to me

Posted on Nov 02, 2007

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1 Answer

What dose red or yellow blinking lights on my jazzy pride electric power chair mean /


  1. VR2/VSI DIAGNOSTIC FLASH CODES
# OF LEDS
CODE
CAUSE
POSSIBLE SOLUTION
One red LED
1
Low battery voltage
Charge batteries
Two red LEDs
2
Left motor open
Make sure left motor is plugged into controller.
Three red LEDs
3
Left motor wiring fault
Contact your authorized Pride Provider.
Three red LEDs One yellow LED
4
Right motor open
Make sure right motor is plugged into controller.
Three red LEDs Two yellow LEDs
5
Right motor wiring fault
Contact your authorized Pride Provider.
Three red LEDs Three yellow LEDs
6
Inhibit active
Contact your authorized Pride Provider.
Three red LEDs Four yellow LEDs
7
Joystick error
Contact your authorized Pride Provider.
Three red LEDs Four yellow LEDs One green LED
8
Controller error
Contact your authorized Pride Provider.
Three red LEDs Four yellow LEDs Two green LEDs
9
Brake fault
Make sure both motors are plugged into controller.
Three red LEDs Four yellow LEDs Three green LEDs
10
High battery voltage
Contact your authorized Pride Provider.
What if the speed LEDs on the VR2/VSI begin to flash?

  • Determine if the battery charger is connected to the power base. When the battery charger is connected to the power base, a charger inhibit feature keeps the power chair from driving. This is indicated by the VR2/VSI speed
    LED(s) flashing.
  • Determine if the charger harness fuse has blown. A blown charger fuse can cause the charger inhibit to
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Oct 05, 2017 | Pride Health & Beauty

1 Answer

RED LED FLASHING WANT STOP/TV WANT COME ON


Check power supply to see if its working, check across main cap, Do not use chassis ground for 160v. If good, check for 130v on the collector of the horizontal output transistor, if missing voltage, check for either an open low value resistor in the power supply or an open pekoe fuse or a bad voltage reg ic.

Oct 31, 2011 | Toshiba 32A43 32" TV

2 Answers

NO PICTURE NO SOUND


if blink 6 time,ic regulotor is broken,you must repleace ic 6400 ic mcz3001db

Sep 06, 2009 | Sony Grand WEGA KDF-42WE655 42" Rear...

1 Answer

The monitor led is green but it gives white flash and still blank


Check the volatage regulator in the mainboard resolder all you found dried unsolder parts inside mainboard. Voltage test the regulator IC if have a voltage flow 2.5 to 5v DC. check ribbon cable connector from mainboard to controller board if properly connected. In the controller board find the small fuse test it for open.
Reminder:
When you voltage test in the power board
in the primary section of power supply
use hot ground. Do not use the hot ground
when you voltage testing the secondary
power supply, mainboard and controller
because it will cause of damage
semiconductor. For safety use cold ground
for secondary, mainboard and controller
board.

Aug 29, 2009 | ViewSonic VA712 17" LCD Monitor

1 Answer

Low voltage power supply problem


Hi, I agree that the regulator IC is probably toast but you`ll need a service manual to figure the rest because none of the leds are on which means NONE of the secondary supplies are running, check the chemical fuses and I`m sure some will be open. you can go to encompass parts on the internet to order the sm, trust me you`ll fix it a lot faster, gl, video-tek

May 31, 2009 | Hitachi 55FX20B 55" Rear Projection...

1 Answer

Toshiba 50HX81 Power LED Flashing


Check any/all soldered-in micro fuses....F850,F851 etc.
Re-check your work......
solder jumper wires on signal board or fuse (s) may blow......T.

Apr 20, 2008 | Toshiba 65HX81 65" Rear Projection...

1 Answer

Blinks twice pause blinks 4 times


SYMPTOMS
Dead or Shutdown symptoms.
RESOLUTION
Dead symptom reported to be caused by the following:
1. Dead.
Found Q601 & Q602 shorted, R615 open, and IC600 on the A Board were the cause of the symptom.

2. Dead.
Found D614, Zener diode, on B+ line was shorted.

3. Set shutdown and the standby LED blinks 3 then 5 times.
Found 200v line was low. Disconnected CN706 on the C Board and found 200v now
present on CN706/pin 7.
Found: IC702 (C board) shorted the 200 volt line.
HQ Comments: C541 on the A Board could become defective if the 200v line is shorted since
the polarity on the capacitor will become reversed. R553 fuse resistor could also be opened
on the A Board.

4. Error code of 4 blinks .
Dead set press power button you hear the relay and you see red led flash 3 times and stops? Has no HV or other action. Tech removed the back as no 200 volt supply, did unplug CN706 and now has 200volts. Tech did remove the IC702 and same it comes up so needs this IC.

5. Dead. 5 blinks then 3 blinks. Found shorted Damper diode D504. Q502 has a built in damper, as well.

6. The TV does not turn On and the LED flashers 9 times.
Found one side of R610 open on the Base of Q690 on the A board.

7. Dead, 9 flashes, Q606
Would not start when cold, has stand by 5 but relay never energize.
No response from front panel or remote controls.
9 blinks is not in service manual.

Found Q606 (Zero Det.), on the A Board, had no soldered on the collector
of the transistor causing an intermittent connection.
Soldered the collector of Q606 and set returned to operation.
HQ Comments: Also refer to E30968554.

8. Dead. 5 blinks or 3 blinks
Found on the A Board D611 in the Power Supply open, and Hor. Output Q502 shorted.

9. Found Power Supply components D611 shorted causing Q600, Q601, and R615
to fail on the A Board.

10. No picture or sound. Standby flashes.
Found Q512 (Pin Out) shorted. on the A Board.





11. Dead. No sound or picture.
Found the FBT and Q502 were shorted, and R615 open on the A Board.

12. Dead
No power, Stand by light flashes 4 times.
Found T604 and IC601, replaced.
Found D611 on the A Board was the cause of the symptom.

13. Dead.
Found D534 shorted on the A Board.

14. Shutdown 4 Blinks.
Replacing R595, OCP Latch Q532 on the A Board, fixed the set.
PN 1-247-891-00, 330K 1/4 watt.

15. Unit shuts down after 15 mins.
Immediate shutdown - sometimes it give a 3 blink, sometimes nothing.
Found R595 (330K) was open located in the Q532 OCP Latch circuit.
R595 P/N 124789100 330k 1/4w

16. Won't power up. LED Blinks 4 times, B+ is very low
B+ is at 49V, +15/-15 only coming up to about 1 volt.
Wth Hor Out disconnected B+ only comes up to 50v.
Found D611 on the A Board was the cause of the symptom.

17. Intermittently does not turn on
Found a intermittent C633 on pin # 3 of IC600.
C663 P/N 113647911 Film cap .001uf 100v



Billy

If you need the service manual contact me at:billyjones@fletchersite.com

Jan 27, 2008 | Sony FD Trinitron WEGA KV-32FS120 32" TV

2 Answers

Will not stay on


RED light is protect circuit = do not disable !
Look for C702 near flyback transformer - might be hidden in
glue = check it = if shorted, replace 102K / 2KV with 3KV =
Sony part # 1-161-754-00 and replace E994 pico fuse.....T.

Nov 08, 2007 | Hitachi 60UX54B/55K 60" Rear Projection...

1 Answer

No t.v.


Just a ?---When you say you checked fuses,does that include the soldered in micro-fuses?? 2)no power to the flyback is not a symptom-- could you describe what the set is doing or not doing? Is the red LED blinking up front,etc. Please advise-----need more info.

Sep 06, 2007 | Toshiba 42H82 42" Rear Projection...

2 Answers

Flashing LED on front panel


The place is call wwww.servicemanuals.net ,you can get it download or a paper copy,for this set I dont know the price but it will give it to you when you put the model number.Check for shorted horizontal output and loose conections,sometimes intermitant conection damage this transistor.Be careful

Oct 04, 2006 | Toshiba 57H81 57" Rear Projection...

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