[TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
- From: Warren <warrenca@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 22 Mar 2005 00:24:17 -0500
Just an update all!
I found a problem with the HV divider, when hooked up the set wouldn't
fire up.
Disconected the set would turn on with normal voltages and audio. no
picture of course..
With HV divider not hooked up the standby voltages still too high???? 153v
Both damper diodes were bad and .056 cap too!
Also installed was the full start up kit.
A few other secondary caps and diodes installed too.
I have many hours invested in this set for just $30.00 estimate fee.
The customer spent just $50.00 to purchase this tv and they wanted it
fixed for $180.00 or less.
So we have a problem here.
I don't know if they will tell me to continue or not.
I also don't know what this type of repair is worth? (or is it worth while)
I don't mind giving the kid a break but how much of one?
Right now it's a decoration in my already over run showroom.
Thanks Warren Campbell
Warren wrote:
>Hi all!
>
>I will list the work so far:
>
>15 V standby = 14.2
>5V standby =4.9V
>Raw B+=151V
>Regulated B+ is too high I think ...The meter does not like the signal
>at TP4101 some times 197V sometimes 1.97V??
>Should the Reg B+ be 143V before turn on????
> From cathode of CR4106 to Cathode of CR4101 first I had 2 Volts.... Now
>after changing diodes I get 3 volts???
>Should be under 1 Volt.
>
>Installed a startup kit from Global Q4101, U4101, C4102, C4118, C4108
>(47uf) which also was a 47UF before.
>My schematic shows 39uf ?? does this make a difference??
>Caps were installed first with Q4101 , IC U4101 was installed afterwards.
>Also changed C4104(15uf) with also no change.
>I also tried to isolate the H out (curiosity) - no change
>
>I've read many tips but most of these point to the parts that I've
>already changed.
>Can someone brush up my 169 skills.
>What am I missing??
>Does anyone have a troubleshooting flow chart for the 169?? This would help.
>
>BTW when you push the on button you can see the front led give a slight
>single blink.
>
>TIA all !
>All tips and comments welcome.
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