RCA 56" Projection blows SMPS!
 

Model # P56812BL, Chassis # CTC195A2, dead with 8-pin SMPS Reg IC
U14101 TDA4605-3 blown apart, Q14101 IRF740 shorted, R14125 badly
burnt, replaced these parts, horizontal output, convergence power
supply, as well as secondary diodes in SMPS, all check fine, no other
static
shorts. Plug in unit, & instantly blows these parts again. Did I miss
something? Thanks, Dani.

RCA 56" Projection blows SMPS!
 

Sorry MeatPlow....this post was meant for Electronics Technicians.
Thanks, Dani.

RCA 56" Projection blows SMPS!
 

oooooo....


"Dani" wrote in message
oups.com...
Sorry MeatPlow....this post was meant for Electronics Technicians.
Thanks, Dani.

RCA 56" Projection blows SMPS!
 

Dani wrote:
Model # P56812BL, Chassis # CTC195A2, dead with 8-pin SMPS Reg IC
U14101 TDA4605-3 blown apart, Q14101 IRF740 shorted, R14125 badly
burnt, replaced these parts, horizontal output, convergence power
supply, as well as secondary diodes in SMPS, all check fine, no other
static
shorts. Plug in unit, & instantly blows these parts again. Did I miss
something? Thanks, Dani.

Looks like you missed some pretty basic troubleshooting, let alone the
root cause of the failure. You plugged the unit in after replacing
multiple parts in two main power circuits?

Start with the basic SMPS troubleshooting first, then move in to basic
troubleshooting the horizontal output circuit.

If you are not sure how to properly load the SMPS to verify regulation
on reduced AC line voltage or how to reduce the voltage to the
horizontal output stage, you might want to contact a local technician
to have a go at the set or another well experienced technician in your
shop to assist.

RCA 56" Projection blows SMPS!
 

You guys aren't much help, I must say! I do electronics for a living! I
DID check all
components in the SMPS, & couldn't find ANYTHING measuring out of the
norm!

I wanted to know if could shed some light, or saw this before in this
chassis!

ALL CHECKED OK!!!!!

Thanks, Dani.

RCA 56" Projection blows SMPS!
 

Dani wrote:
You guys aren't much help, I must say! I do electronics for a living! I
DID check all
components in the SMPS, & couldn't find ANYTHING measuring out of the
norm!

I wanted to know if could shed some light, or saw this before in this
chassis!

ALL CHECKED OK!!!!!

Thanks, Dani.

Are you saying the SMPS checked and had proper operational waveforms
and voltages when operating in standard test condition with a
controlled current and voltage input with a properly selected test
load?

Or are you saying that all you did was to check the components in the
SMPS with a multimeter?

I have seen plenty of ctc195 series RTPV chassis have catastrophic
failures on plug in. Everything from a cracked crt, hv splitter,
flyback, hot shaping capacitor, to random out of spec parts in the
SMPS, not to mention several with coolant leakage on the board. Even
had one that had an I2C corruption problem with the HFREQ cause massive
failures.

What are the results of standard troubleshooting to try and narrow down
the SMPS or HOT stage and which waveforms were bad.

RCA 56" Projection blows SMPS!
 

"Dani" wrote in message
oups.com...

You guys aren't much help, I must say! I do electronics for a living! I
DID check all components in the SMPS, & couldn't find ANYTHING
measuring out of the norm!

I wanted to know if could shed some light, or saw this before in this
chassis!

You've got to have a sense of humor AND a thick skin.