Re: RCA L32WD22 no picture
Thanks budm. The LDO regulators you circled are all marked as "7E7L 17-33L" They measured as follows...
LDO #1 Pin1 5.4mv Pin2 3.28v pin3 5.02v
LDO #2 Pin1 4.3mv Pin2 3.33v pin3 5.02v
LDO #3 Pin1 5.5mv Pin2 3.30v pin3 5.02v
On the inverter board, 2 of the fuses read 0 ohms, but fuse 1 read 1.8 ohms.
I've included a pic of the back of the inverter board that has the pin functions.
The voltages at the cable (not plugged into the inverter board) are..
Pins 1-5 (VDD) 24.07v
pins 6-10...
rossland
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Last Activity: 12-26-2015, 02:17 PM
Joined: 01-14-2013
Location: Rossland
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Re: RCA L32WD22 no picture
More pics. I've included the values printed on the PCb for the regulators....Leave a comment:
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Re: RCA L32WD22 no picture
Sorry guys, I'm new to this. More pics to come. The inverter board? Is that the one for the backlight?Leave a comment:
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Re: RCA L32WD22 no picture
After changing the battery, I got some readings that make sense...
5volt = 5.26 standby, 5.19 switched on
15volt = 15.01v
24volt = 24.01v
Now the 12 volt ... 13.54v on standby (should this have voltage on standby?) 13.47 switched on.
I think its safe to say that the 12 volt is too high. Could this be the cause of my problems? I checked the main board too. All the voltages at the regulators are within spec, as printed on the board.
Also, the 5 volt is a bit high, is this a problem?Leave a comment:
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Re: RCA L32WD22 no picture
Thank you for the advice. I will replace my battery and re measure the voltages. I uploaded a couple more pics showing the connections. I have voltage going to the Darfon board, but it doesn't turn on. What kind of signal does it need on the on/off pin... grounded, or a voltage ? Wish I could find a more useful service manual....Last edited by rossland; 01-21-2013, 08:40 PM.Leave a comment:
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Re: RCA L32WD22 no picture
I had another go with the power supply board. Everything looks good with the exception of the 12 and 24 volt legs running too high. Is this acceptable? I'll check out the main board tonight.Leave a comment:
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Re: RCA L32WD22 no picture
Thanks for your help. Hope these pictures are helpful. I am no expert by any means, and this is my first TV repair. I am pretty good at soldering, and have repaired other electronics. I have a few DMMs, and a scope. I forgot to mention in my last post that my 24v was also high at 27v.
C...Leave a comment:
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RCA L32WD22 no picture
Hi, my TV quit while I was plugging in a HDMI cable (just coincidence?) The LED turns green, but no picture, sound, etc...can't bring up menu..nothing. When I turn it off the LED flashes amber 23 times. The voltages on the power supply check out .. 5v, 15v, but the 12v reads high at 14v. All caps are visually OK, nothing burnt. Same with main board. Any suggestions?
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