Re: RCA rlded3950a-b sound but no video
Just wanted to update everyone who helped me and to thank you for doing so. All in all I had to change the blue ceramic cap at c22, changed mosfet that shorted "p7nk80zfp" at q3 i think and changed two resistors at R44 and R45. My tv is up and running a half an hour so far. Thanks for all your help everyone.
MrBowtie
Member
Last Activity: 11-05-2020, 10:27 AM
Joined: 01-08-2014
Location: Catalone/Nova scotia
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Re: RCA rlded3950a-b sound but no video
I'm having a hard time trying to find the GR8876a ic chip without having to order from China. Was wondering if there are any other chips that i could replace it with? Would a ld7575 work? Or could someone tell me what kind of chip to look for at digikey. Thank you for all your help and sorry to be a pain.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
Any idea where i can order these parts? I tried looking up the ic gr8876a at digi key but no results.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
R17 is the one in the heat shrink near the big cap. R13 is marked 1001 and is reading 997. R23 is marked 470 and is reading 480. R26 is marked 360 and reading 375. R30 is marked 1002 and reading 9.23 meter set at 20k. R39 is color coded gold, orange, red, silver and reading 80.9 meter set at 200k. R44 is marked 470 and reading 0. R45 is marked but can't tell what it was but reading 0. The IC chip is marked GR8876a C5038 and is reading 92 on pin5 to jp9 with meter set at 200k. C16 looks fine but can't test it. Hope this helps.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
Forgot to mention R44 and R45 look toasted.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
Not sure if my numbers will sound right for resistors but here are my findings. R17=2.5, R44=0, R45=0, R23=480, R26=37.5, R30=9.23, R39=80.9. The ic chip looks good and has a reading of 91.5 if that sounds right. D5 is 0 one way and 558 ohms the other way. D25 is showing 48 ohms both ways. As for c16 not sure how to check but i tried different settings and got nothing. Was there another resistor you wanted me to check? I noticed you had R39 or something twice in your post.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
Thanks so much Budm. I'm going check all that now.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
It looks good from what i can tell.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
It has like a glue all over that spot.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
The diode is fine.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
I'm going to check that now.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
Here's a pic of bottom where i removed transistor....Leave a comment:
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Re: RCA rlded3950a-b sound but no video
Oops your right 80. Yeah it looks like it shorted but I'm not sure if it happened because the ceramic cap blew beside it or if the transistor shorted and caused the cap to blow.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
It's a P7NK89ZFP G40M6 CHN 225N. Here are some more pics. How do i test it? Thanks for helping vinceroger69....Leave a comment:
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Re: RCA rlded3950a-b sound but no video
The only other number i see on the board is LEKE LKP-PLO65Leave a comment:
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Re: RCA rlded3950a-b sound but no video
PL390101b 6021010157-a. I looked up PL390101b and it says it's a Apex power supply.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
Being a newbie i think i made a mistake calling it a transistor instead of a voltage regulator. Edited and fixed.Last edited by MrBowtie; 01-09-2014, 02:47 PM.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
Not sure how to circle things in pics but here's a couple of more. In first two pics i posted the ceramic cap i replaced is just above the yellow transformer and to the right. The voltage regulator beside the cap to the right looks like the two legs closest to the cap shorted. Can i check this somehow?...Last edited by MrBowtie; 01-09-2014, 02:46 PM.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
I'm not to sure of the part number....can't quite see the whole number. I'll take another look and see it i can take another pic.Leave a comment:
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Re: RCA rlded3950a-b sound but no video
Here are some pics...Leave a comment:
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