TV repair attempt - help with diagnosis

[TD]

We have a Hitachi C36WF830N 36" CRT television. Unfortunately, it has broken
down, hence this post. I dabble in electronics but am no means an expert. I
have skimmed http://www.repairfaq.org/sam/tvfaq.htm, which is a great
resource, but I feel I need some more help before I embark on the adventure.

Several times recently, the TV has cut out during normal viewing. We have
found that switching it off for a couple of minutes then back on, allows
normal operation. Unfortunately, now even that does not work.

What happens is that on power-up, I hear the usual click of one, then another
relay, after about 1 and 4 seconds respectively. Normally, after the second
click, the sound and vision work. However, now after the second click,
nothing happens. No sound or vision, no response to buttons on the TV or
remote control e.g. when pressing the volume adjust, the indicator is not
displayed. More than that, I do not believe it is responding - if I press the
standby button on the remote control, the red light on the front flickers
indicating it "sees" the command, but there is no relay clicking etc.

In the above link, this looks most like
http://www.repairfaq.org/sam/tvfaq.htm#tvpotttccc. Do you agree that this is
the right path to investigate? Any other comments? Thanks in advance.

 

[Arfa Daily]

We have a Hitachi C36WF830N 36" CRT television. Unfortunately, it has
broken
down, hence this post. I dabble in electronics but am no means an expert.
I
have skimmed http://www.repairfaq.org/sam/tvfaq.htm, which is a great
resource, but I feel I need some more help before I embark on the
adventure.

Several times recently, the TV has cut out during normal viewing. We have
found that switching it off for a couple of minutes then back on, allows
normal operation. Unfortunately, now even that does not work.

What happens is that on power-up, I hear the usual click of one, then
another
relay, after about 1 and 4 seconds respectively. Normally, after the
second
click, the sound and vision work. However, now after the second click,
nothing happens. No sound or vision, no response to buttons on the TV or
remote control e.g. when pressing the volume adjust, the indicator is not
displayed. More than that, I do not believe it is responding - if I press
the
standby button on the remote control, the red light on the front flickers
indicating it "sees" the command, but there is no relay clicking etc.

In the above link, this looks most like
http://www.repairfaq.org/sam/tvfaq.htm#tvpotttccc. Do you agree that this
is
the right path to investigate? Any other comments? Thanks in advance.

If this was first intermittent in the way that you describe, and has now
stopped completely, the most likely (and common) cause is bad solder joints.
You may be able to prove this fairly simply by just pressing down on the
centre of the main PCB with something fairly long and insulated - like a
chopstick for instance - and repowering. If that makes it come on, look
under the board for a cracked / burnt joint. There are other somewhat more
'electronic' possibilities, but bad joints is certainly the first thing to
go for.

I don't believe that the link points to a particularly relevant series of
tests to your described problem, at this stage of the investigation.

Arfa

 

[TD]

If this was first intermittent in the way that you describe, and has now
stopped completely, the most likely (and common) cause is bad solder joints.
You may be able to prove this fairly simply by just pressing down on the
centre of the main PCB with something fairly long and insulated - like a
chopstick for instance - and repowering. If that makes it come on, look
under the board for a cracked / burnt joint. There are other somewhat more
'electronic' possibilities, but bad joints is certainly the first thing to
go for.

I don't believe that the link points to a particularly relevant series of
tests to your described problem, at this stage of the investigation.

Arfa

Thank you for the helpful response, I will investigate and report back.