Toshiba Projection TV

[Michael Welsh]

Model TP55G60, TAC 9753 chasis, unit is dead. The relay clicks but no
power then the red light starts blinking. Any suggestions. Mike

[John Townsley]

I would steer towards the convergence IC's first. Look for bad connections
where the boards plug in. That blinking light only eliminates about 2
things. Unplugged and working ok.
Michael Welsh wrote in message <3762DBD6...@erols.com>...

[PWhite4]

I believe this set has a protect IC "IC Z801" near the front edge of the
chassis that monintors a few inputs from different circuits. Start by finding
out which input is triggering the protect IC. I had one that the gate input
pin (pin 14 on IC Z801) was going high, should be 0v if OK. This set would get
HV then shutdown imediately and HV would bleed off. Relay would click on and
back off very quickly. The problem was R347 on what is called the "DPC" board
had changed in value from 180K to 413K. Was a tough one to find. The DPC
board stands up on the mother board. Hope this helps.

PW

[David Kuhajda]

You will need service manual to follow these steps I use for
troubleshooting these.

1. Pull the 130v line fuse and see if the power supply comes up and
regulates at 130 volts.
If it is then the power supply is 99% for sure ok. Reinstall the fuse.

2. Ground the positive of c474 on the protect module, per the service
manual.
This will rule it out if the set comes up properly. Unground the
capacitor.
3. On the convergence board you will find a 3 pin plug, on of them is
protect line, pull the plug and remove the protect wire. If the set
comes up you have a failure in the convergence circuit. If it does come
up and stay up, some resistors may start to burn on the convergence board,
unplug the tv before they go up in smoke.
4. Physically pull all the yokes off the picture tubes and make sure they
are not burnt, if one of them is, that crt probably is also damaged. VERY
COMMON. If you need to replace the crt, make sure you order the high
voltage lead and high voltage silicon from Toshiba. Affix the lead to the
tube and wait 2 full days before putting in the set and powering up. It
must be 100% cured before appplying the high voltage.
5. Pull the DPC board and unsolder the protect line. This can be risky so
be prepared to unplug the tv ASAP. Have seen a 180k resistor increase in
value and cause dead/ intermittent dead set problems.
6. Pull all the high voltage wires to the crt's out of the hv block. If
set runs, install one at a time with the set off to find which crt is bad.

7. As a last resort, ground the anode of each of the remaining diodes on
the protect line, of course with the high voltage leads to the crt's
disconnected. To find which circuit has the problem.

David